Tesis sobre el tema "Control low strength material"
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Du, Lianxiang. "Laboratory investigations of controlled low-strength material". Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3031045.
Texto completoWagstaff, Kevin Bjorn. "Evaluation of Passive Force on Skewed Bridge Abutments with Controlled Low-Strength Material Backfill". BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5824.
Texto completoLaws, Paul. "Corrosion fatigue performance of welded high strength low alloy steels for use offshore". Thesis, Cranfield University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359541.
Texto completoDas, Shagata. "Performance Enhancement Of Controlled Low-Strength Grout Material (CLSM) For Annulus Voids Of Sliplined Culverts". University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron162828626290938.
Texto completoCawood, Gareth James. "Design of a low-cost autonomous guided cart for material handling". Thesis, Nelson Mandela Metropolitan University, 2015.
Buscar texto completoBlack, Rebecca Eileen. "Large-Scale Testing of Low-Strength Cellular Concrete for Skewed Bridge Abutments". BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7708.
Texto completoRemund, Tyler Kirk. "Large-Scale Testing of Low-Strength Cellular Concrete for Skewed Bridge Abutments". BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/7213.
Texto completoShah, Jigar. "Laboratory Characterization of controlled low-strength material and its application to construction of flexible pipe drainage system". Ohio University / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1172866182.
Texto completoDrury, J. A. "An investigation into the fatigue and corrosion fatigue properties of two high strength low alloy steels and their HAZ's". Thesis, Cranfield University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332936.
Texto completoAigbomian, Eboziegbe Patrick. "Development of wood-crete building material". Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/13445.
Texto completoSlagle, Adam Christopher. "Low Frequency Noise Reduction Using Novel Poro-Elastic Acoustic Metamaterials". Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64200.
Texto completoMaster of Science
Miner, Dustin David. "The Effect of Flowable Fill on the Lateral Resistance of Driven-Pile Foundations". Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd3308.pdf.
Texto completoTang, Zhenghua. "Optimising the transformation and yield to ultimate strength ration of Nb-Ti micro-alloyed low carbon line pipe steels through alloy and microstructural control". Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-07212007-110711.
Texto completoLizarralde, Jon Mikel. "Non-destructive testing of thin strip material : Implementation of the 3MA technique at a steel producing company". Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24256.
Texto completoCruz, Magnus Geder Henz. "Estudo da substituição de aço convencional por aço de baixa liga e alta resistência (BLAR) em módulo estrutural". reponame:Repositório Institucional da UCS, 2006. https://repositorio.ucs.br/handle/11338/136.
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Two kinds of steel were studied, conventional steel ZAR 230 (a standard for high strength galvanizing) and microalloyed steel ZSTE 380 (according to the regulation SEW 093). The study of its mechanical properties aimed to replace the steel for microalloyed steel in bodywork s tubular structure for collective transport vehicles of passengers. The conventional steel has been used for the bodywork industry for years, and the microalloyed steel is basically used in specific structures, those who require good mechanical properties and mass reduction. The analysis of the feasibility for the replacement of conventional steel for microalloyed steel in a complete structural model requires a series of tests. Lab tests were done to evaluate their main mechanical and chemical properties. The tests of the structural nodes and the structural behaviour when subjected to a load provided information to be used in the finite elements method software to do structural calculation and to calibrate the results. The structural modules were prepared according to the regulations ECE R66-00 (European market) and CONTRAN 811/96 (Brazilian market) and these modules were tested exhaustively to achieve the best displacement between the two materials that were analysed comparatively. The validation of the tubular structure was obtained using the software Ansys Workbench 9.0 and the production of the representative structure of a bodywork tested according the regulation CONTRAN 811/96.
Le, Guen Marie-Pierre. "Etude et réalisation d'un générateur de courant : application à l'étude des mécanismes d'approche à la saturation dans les tores ferrimagnétiques polycristallins magnétiquement doux". Brest, 1987. http://www.theses.fr/1987BRES2038.
Texto completoChen, Pen-Lin y 陳本霖. "Reuse of Stone Sludge in Control Low Strength Material". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/rzjub5.
Texto completo大漢技術學院
土木工程與環境資源管理研究所
102
ABSTRACT To achieve sustainable development, nations are actively transforming industrial waste into resources. In Taiwan, copious quantities of marble waste are produced annually. Recycling this waste into usable resources would reduce the amount of refuse and advance the goal of sustainable development. Accordingly, in this study, we explored the use of marble waste sludge in controlled low-strength material (CLSM) by replacing the fine aggregates in CLSM with an equal weight of marble waste. The pipe flow, chloride ion content, and compressive strength of nine CLSM mixtures were tested to examine the influence of marble waste sludge on CLSM characteristics. The results show that when 30%~90% (by weight) of the fine aggregates in CLSM were replaced with marble waste sludge, the CLSM pipe flow ranged between 20 cm and 22 cm, which complies with construction standards in Taiwan. Increasing the proportion of marble waste sludge decreased CLSM compressive strength. When 90% of fine aggregates were replaced with marble waste, the compressive strengths on Days 1 and 28 were 12 kgf/cm2 and 82 kgf/cm2, respectively, which conform to required specifications. However, the final setting time spans as much as 15 hours, which would require attention in practical applications. The chloride-ion content of CLSM substantially increased when cement accelerators were used; thus, the amount of cement accelerator used should not exceed 4% of cement weight. High proportions of marble waste resulted in decreased chloride-ion content in CLSM, but the amount of binder and coarse aggregates had limited effect on chloride-ion content.
張家瑋. "The Mechanical Behaviors of The Control Low Strength Material". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/02735203095812807028.
Texto completo國立屏東科技大學
土木工程系碩士班
91
”Control Low Strength Material” is a self-compacted material. It is used primarily as a backfill material. This study investigate the mechanical behaviors of CLSM by experiment. The relationship is between the size of specimen and the uniaxial compressive strength are discussed first. Then the mechanical behaviors are investigated. The stress-strain curve of CLSM are obtained by the uniaxial compressive test. The elastic modulus is discussed by using the stress-strain curves. Two different mixtures Portland cement and Soil Amelioration are also used. The test results have been compared and discussed.
Chen, Kung-Chen y 陳坤辰. "Effect of Electric Arc furnane Slag as Coarse Aggregate for Control Low Strength Material". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7j2463.
Texto completo國立臺灣海洋大學
河海工程學系
105
The purpose of this study is to investigate the effects of the use of arc furnace ballast to replace the coarse-grained materials for CLSM characteristics under different standard requirements. The control of low-strength backfill material (CLSM) To reflect the spirit of low cost, environmental protection, waste recycling and sustainable use. The research part can be divided into two parts: the first part is for the arc furnace ballast instead of coarse aggregates for the CLSM of the new filling, liquidity and other properties to be discussed, the second part is for hard solid concrete Observations of mechanical properties such as compressive strength at different ages. The test results show that the arc furnace ballast is roughly in line with the requirements of alternative control low-strength backfill material coarse aggregate. And the appropriate level of the ballast can also be mixed into a suitable control of low-strength backfill materials, and even the strength of the development of natural particles than the control of low-strength backfill material is better. It is feasible to make controlled low strength backfill material by replacing the coarse aggregate with electric arc furnace and to optimize the amount of 75%.
Chang, Ke-Chih y 張格誌. "A Study on Recycling Incinerator Fly Ash and Production of Geopolymer Control Low Strength Material". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/d2xvh3.
Texto completo國立臺北科技大學
資源工程研究所
104
Incineration has become an important treating method for combustible solid wastes, especially in municipal areas due to the increasing difficulty to get suitable sites for traditional landfill. It is estimated that there are about 0.3 million tons of incinerator fly ashes generated annually in Taiwan. However, these incinerator fly ashes contain large amount of hazardous materials such as chloride and heavy metals. If these hazardous materials cannot be carefully treated, it will cause detrimental secondary contamination. The objective of this research work is trying to use a saving water attrition scrubbing method to wash incinerator fly ashes in order to removal chloride and heavy metals. The washed fly ashes will be the raw material for making geopolymer control low strength material. Experimental results show that during washing process, an attrition scrubbing and stirring technology with liquid to solid ratio of 4, the heavy metal can be removed and achieved the standard of TCLP. Althought the total chloride in washed incinerator fly ash olny removed 87%. The washed incinerator fly ash can be reused as raw material for geopolymer control low strength material(CLSM). The geopolymer CLSM show great properties.
Lin, Yi-Siang y 林義翔. "The Feasibility Study Of Using Granite Saw Sludge For Manufacturing Control Low Strength Material And High Performance Concrete". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/00384460375736351190.
Texto completo國立臺灣科技大學
營建工程系
96
This study main focuses on using granite saw sludge (GSS) for producing control low strength material (CLSM) as well as high performance concrete (HPC). The parameters for CLSM group are three water-to-cement ratios (w/c) as well as three GSS replacement ratio. The parameters for HPC are three powder material series with GSS, and three water-to-binder ratio (w/b) to cover the strength range from normal to high strength HPC. The result indicates GSS is an inert mineral admixture, and the reactivity is mainly due to the action of lime. The use of GSS for making CLSM meets the workability requirement (revision slump flow greater than 150 mm) and initial setting time requirement (less than 7 hours) besides the group of GSS replacement of sand is more than 10%. The unit weight of every group is less than 2000 kg/m3. Besides the group with w/c=2.0 and GSS replacement of 10% sand, the one-day compressive strength meets the requirement (greater than 7 kgf/cm2). The 28-day compressive strength is smaller than the maximun requirement of 90 kgf/cm2. The GSS hence can be used for producing satisfied HPC, however GSS should be used with pozzolanic material for making a durable one. Keyword: granite saw sludge (GSS), control low strength material (CLSM), high performance concrete (HPC), inert mineral admixture, revision slump flow, initial setting time, durable.
Hsieh, Wei-Chi y 謝偉祺. "Study of Controlled Low Strength Material Properties". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/18896924141635776660.
Texto completo國立中興大學
土木工程學系所
98
For the pipeline backfill material, to improve the road using CLSM backfill quality of service, monitoring the Settlement amount of CLSM to compare the usefulness. CLSM is a material with high water-cement mixture, higher than normal concrete big settlement. CLSM settlement amount due on time has not been established, testing understanding in this experiment. The purpose of this study but to have different mixture CLSM, shrinkage and water cement ratio and loaded with or without compared to the settlement amount. Research the relationship between the mixture at the subsidence and construction quality. The results show that, the settlement amount will tend to gradually slow after 5 to 7 days, load carrying capacity of the CLSM in the settlement not much impact.
CHING, TSENG YU y 曾玉卿. "Producing controlled low strength material using water purification sludge". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/47611863724770689619.
Texto completo正修科技大學
營建工程研究所
103
Controlled low strength material (CLSM) is composed of water, cementitious materials (cement and pozzolan), coarse and fine aggregates (or other by-products), and other chemical admixtures. It is flowable, self compacting, and used primarily as a backfill instead of a compacted fill in trenches or numerous applications.
Jun-JieLin y 林俊傑. "Application of Slags to the Controlled Low Strength Material (CLSM)". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/v5gf9v.
Texto completoDingrando, Jeffrey Scott. "Beneficial reuse of foundry sands in controlled low strength material". 1999. http://catalog.hathitrust.org/api/volumes/oclc/48043591.html.
Texto completoTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 104-106).
Chang, Hsien-Chang y 張憲章. "The Feasibility Study of Using Desulfurization Gypsumfor Controlled Low Strength Material". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/694mp4.
Texto completoChan, Meng-Huang y 詹孟晃. "The Model for the Mechanical Behavior of Controlled Low Strength Material". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/59876075624526252518.
Texto completo國立屏東科技大學
土木工程系碩士班
91
Controlled Low Strength Material (CLSM) is a self-compacted, flowable material. Present paper discusses the mechanical behaviors of CLSM. The stress-strain curves are obtained by the uniaxial compression test. The Popovics'''''''' constitutive equation is modified for CLSM by present paper. Also, present paper develops a constitutive model for CLSM. The theoretical results of both models are compared with experimental data. The results are satisfactory. The relationship between the ultimate stress and the corresponding strain is defined in terms of ultimate stress by researchers. The formula derived by Hungarian Code is modified for CLSM by present paper. This formula is used with the constitutive equation to describe the mechanical behaviors of CLSM. The results show that the present model predicts the mechanical behavior of CLSM well.
Lu, Yi-Hsuan y 呂佾軒. "Engineering Properties of High Volume Volcanic Mud Controlled Low Strength Material". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/8z749w.
Texto completo國立臺北科技大學
土木與防災研究所
103
This study arms to reuse of the volcanic mud in the controlled low strength material (CLSM). The volcanic mud was collected from the farm site in the Wandan, Pingtung County, Taiwan. A series of experiments were conducted to determine the engineering properties of controlled low strength material (CLSM) containing high level of volcanic mud. First the volcanic mud was tested for its basic characteristics in order to develop a way for material preprocessing. And then the CLSM mixtures were designed. The test variable included two water-to-binder ratios (0.83 and 1.15), six volcanic mud replacement ratios (10%, 20%, 30%, 50%, 75% and 100%) and slag mixed alkali agent (NaOH) of difference concentrations as alkali-activated materials for the production of volcanic mud CLSM specimens in order to investigate its influence on engineering properties. The test results showed that the properties of volcanic mud were close to those of ordinary fine aggregates. However, its small particle size made it easily adhere more water and is unfavorable to the workability of CLSM. Therefore, when the CLSM with the volcanic mud and without any additions, it required additional 40% of water to maintain its workability. The volcanic mud CLSM has better workability than that of controlled sample duce to the high water content, and it also decae the water bleed of CLSM with the mud. However, with the increase of volcanic mud replaced fine aggregate proportion, the strength reduced obviously. But it was still within the standard range between 20 to 90 kgf⁄cm2. The CLSM containing alkali-activated binder materials displayed good workability and it has significant effects on strength development. The analysis suggested CLSM containing volcanic mud featured low material costs, indicating a more economic choice.
Su, Pei-Shu y 蘇培碩. "Application of CFB Ash with Recycled Aggregates on Controlled Low-Strength Material". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/w95tjc.
Texto completo國立交通大學
土木工程系所
103
Domestic construction and public works mostly use concrete as the main material, however many of the greenhouse gases generated in the production process of the concrete materialt. In recent years, industrial waste such as the slag, fly ash can be used as the composition of the concrete relevant material to reduce carbon dioxide production and reuse of industrial waste, in order to achieve environmental protection and carbon reduction. This research uses CFB hydration ash, desulfurization slag, coal ash aggregates and waste concrete four different aggregates with different ratios used to produce CLSM. Cementitious materials is made form CFB ash, cement, slag three combinations with each other. 64 different sets of CLSM mix design more tested, water-cement ratio 0.69. Each proportion was tested for complace with the construction specifications. Tests performed for each proportion are: Slump flow test, Ball Drop test, Method of test for the water soluble chloride ion content of fresh concrete, the compressive strength of each age (7,14,28,56 days) and strain test of each age (1 to 7, 14,28,56 days).
LIANG, KAI-YAO y 梁凱堯. "Study of the Properties of Controlled Low Strength Material using CFBC Ash". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/77447198574965778109.
Texto completo國立臺灣海洋大學
河海工程學系
102
Recently, circulating fluidized bed combustion technology has been used by the power generation industry due to the acceptance of various fuels, low pollution and high combustion efficiency. The aim of this study is to investigate the properties of controlled low strength materials using hydrated cfbc ash and ggbs. Testing variables include water/binder ratio (1, 0.69), cement/ggbs ratio (1:9、2:8、4:6) and hydrated cfbc ash/sand ratio (0:10、6:4、4:6、10:0). According to the specification of Chapter 03377 of construction regulation issued by PCC, chloride ion content measurement, flow measurement, ball drop test, compressive strength test and shrinkage deformation measurement were performed. Resting results indicate that the performance of mixtures B2Ⅲ and B1Ⅱ are satisfied with the requirements of Chapter 03377. Both mixtures slightly swell. Reduction of carbon dioxide release is around 46~67% in comparison with the controlled mixture which illustrates the advantages of preservation of natural resource and protection of global environment by using cfbc ash and ggbs in CLSM.
Tsai, Fu-Yuan y 蔡福源. "Experimental study of water purification sludge applied to controlled low strength material". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/72636146391446726609.
Texto completo國立中興大學
土木工程學系所
102
The process of water purification produces sludge easily, and such water treatment plant sludge (WTPS) classified as inorganic sludge containing lower organic,otherwise, the properties and production of sludge is different with different water source, pharmacies and treatments in every water purification plants. The study investigate that using WTPS produced by water treatment plants and applying Controlled Low Strength materials(CLSM) to replace fine aggregate of concrete and conduct related materials analysis, material ratio analysis, production analysis of plant production. With the result of research, in the three chose water treatment plants the median diameter of WTPS is between 0.007 mm ~ 0.010 mm and the specific gravity is like normal soil is between 2.63~2.73. With researches, using dispersant processing WTPS producing cement paste is more proper pre-production. According to test set CLSM of proportion of the production, and compressive strength is between 50 kgf/cm²~75kgf/cm². It’s meeting the engineering requirements of CLSM. WTPS to replace fine aggregate proportion to the test results of 30% and 40% of the best meet the needs. It suggests that the proportion replace 30% slag for fine aggregate can get the highest value. If use WTPS contained molysite to produce CLSM, only adjust proper accelerating agent to meet the needs. Through the concrete mixing plant to process production analysis of plant production, can know that cement mortar made from WTPS have lower compression strength than cement mortar made in School laboratory, but it still compliance with CLSM standard. It can show WTPS can use in CLSM for engineering applications.
Deng, An. "Excess foundry sand characterization and experimental investigation in controlled low-strength material". 2004. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-545/index.html.
Texto completoCHENG, CHANG YU CHIH y 張有志成. "Engineering Characteristics of Inorganic Sludge Used as Aggregate of Controlled Low Strength Material". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/17116946553671406018.
Texto completo正修科技大學
營建工程研究所
102
This article discusses the engineering characteristics of inorganic sludge used as aggregate of controlled low strength material, tried to inorganic sludge and waste glass, after drying, grinding into powder, mixed with water glass, cement, slag, fly ash and other pozzolanic materials and water are translated into ball aggregate of different sizes through extrusion, injection molding, rubbing and granulation, then cured 28days used as coarse and fine aggregate of concrete. and then made into a recycled concrete and CLSM material discuss the relations among time of maintenance, compression strength, elasticity modulus. A series of tests are made to obtain the regression curves as references for engineering and construction. The results show that, C10-F40-Y44-GC5-G1 used as yellow inorganic sludge granulation ratio, C10-F40-B44-GC5-G1 used as black inorganic sludge granulation ratio,both used as coarse and fine aggregate of concrete, its composition and strength was general aggregate similar. In the sludge concrete aspects, elastic modulus, dynamic modulus, pressure velocity increase with the square root of the compressive strength. yellow inorganic sludge aggregate concrete elastic modulus value is between 8700 fc' ~ 8718.3 fc', dynamic modulus is between 37461 fc' ~ 39317 fc', black inorganic sludge aggregate concrete elastic modulus value is between 8711.2 fc' ~ 8732.3 fc', dynamic modulus is between 33792 fc' ~ 36932 fc'. In the CLSM aspects, mixed 16 ratios, after cured 1day, compressive strength between 7.4kgf/cm2 ~ 34.5kgf/cm2 far more than 3 ~ 7 kgf/cm2 all can meet specifications requirements. elastic modulus, dynamic modulus, pressure velocity increase with the square root of the compressive strength. yellow inorganic sludge aggregate concrete elastic modulus value is between 8039.6 fc' ~8046.4 fc', dynamic modulus is between 22954 fc' ~ 24655 fc', black inorganic sludge aggregate concrete elastic modulus value is between 6073 fc' ~ 6094.9 fc', dynamic modulus is between 19665 fc' ~ 20853 fc',cured 28 days, measured dynamic elastic modulus Ed = 2 ~ 5Es, very close to the Japan Society of Civil Engineers pointed out that the use of Ed = 2Es soft rock during earthquake.
Hu, Jie-Heng y 胡家珩. "Study on the Feasibility of the Controlled Low Strength Material from Flood Sludge". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/29985228870107659318.
Texto completo國立屏東科技大學
土木工程系所
98
The paper studied on the feasibility of the flood sludge from the 88 water disaster occurred in Taiwan in 2009 being used as a controlled low strength materials (CLSM). Firstly, a CLSM mix design procedure was proposed with fixed water/cement ratio W/C=1.8, three sample sets with cement amount C=180, 210, 240 kg were chosen. In each set, 5 samples were made by replacing 0%, 25%, 50%, 75%, 100% aggregate by flood sludge. Each sample was then performed the tests of unit weight, air content, flow consistency, setting time and compressive strength. The former two tests were used to revise the mix design, the latter three tests were used for evaluating the feasibility of each mix sample used as a CLSM. The test results showed that, when the flood sludge replacement K was larger, the air content and setting time became larger, but the unit weight and flow consistency became smaller. Except the mix samples of C=210 kg with K=0% and C=240 kg with K=0%, in which aggregate segregation occurred, compressive strength became smaller. The mix sample of C=210 kg with K=100% could satisfy the requirements of 15~20 cm flow consistency, setting time less than 12 hours, and 20~50 kgf/cm² 28-day compressive strength, which were proposed by the Public Construction Commission of Executive Yuan for pipe and trench re-filling. In addition, the mix samples of C=180 kg with K=50% and C=210 kg with K=75% could satisfy the requirement of 20~30 cm flow consistency. Therefore, the best sample was C=210 kg with K=100% for normal flowing replacement, and C=210 kg with K=75% for high flowing replacement when the replacement amount of sludge was considered.
Chen, Tze-Yi y 陳澤毅. "Effect of MagneticWater on Engineering Properties ofControlled Low Strength Material with Fly ash". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/78514594965278837806.
Texto completo雲林科技大學
營建工程系碩士班
97
The objective of this research main discussion regards magnetic water and makes fly ash Applies of feasibility study in the Controlled Low Strength Material(CLSM);This may promote the reject to use and to improve the road backfill and the trench backfill quality again. This may promote the reject to use and to improve the road backfill and the trench backfill quality again. In the research coordinates quality of demand the present CLSM baseline group, the objects of this paper are to discussion including workability damage, hydration reaction, fresh mixing strategy, Concrete micro structure, fresh properties and mechanics properties. The physical principle out of after water is cut by the magnetic force line, the water molecular arranges neater,and of magnetic water relative gravitation relatively little, apt to enter grout body react than water that does not magnetize, make water function completeness,and then improve the intensity of Concrete, fly ash be concrete admixture it can reduce the hydration heat to low, increase the compressive strength, durability and saving cost of concrete. Furthermore, it can avoid that pollution problems of the fly ash, become the re-usable material. The result of the research shows, part of the workability that the magnetic water can raise the workability of the CLSM and accelerate hydration and shorten the setting time, magnetic field intensity heavy magnetic water is higher speed to have to CLSM flow ability, and W/B =1.6 and 1.7, because have enough water, concrete workability can promote 8~20%,the question to reduce, CLSM can all reach Construction and Planning Administration grade to put quietly for 45 minutes;part of the compressive strength, the compressive strength raise apparently at 0.4T magnetization and each replacing amount higher than none magnetizing 20% to 30%;fly ash it can not develop good early-age strength, the fly ash replace cement (, 30%~70%) that lower than without groups;part of the concrete micro structure, We can clearly observe the waste fly ash proceeds to the condition of the pozzolanic reaction in the CLSM and the mixing magnetic water can accelerate hydraulic reaction and make hydration products advancement by TG. Let show the fly ash and magnetic water consume the CH and precede to the condition of the pozzolanic reaction in the CLSM by the X-rays diffraction analysis experiments.
Wang, kai-Ming y 王凱民. "Effect of CFBC Ash used for Controlled Low Strength Material (CLSM) for Backfills". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/d869ye.
Texto completo國立臺灣海洋大學
河海工程學系
105
This research is for the purpose of discussing domestically uses the circulation type fluidized bed (Circulating Fluidized Bed Combustion, after CFBC) burns has the industry sideline product substitution potential of for the concrete packing material, appraised the controllability low intensity backfill material (CLSM) allocated proportion burns the incineration in the present project use using the circulation fluid bed the latent use, allocated proportion of in the controllability low intensity backfill material uses the common plumbing engineering backfill use the F level ash or completely replaces take the part the use as the CFBC ash, reaches to in the allocated proportion to pick the different proportion to substitute directly the thin aggregate packing material experiment minute to mix the result newly. This research the controllability low intensity backfill material allocated proportion in the cement, the water consumption and the hydrogel compared to in does not change under the principle, the CFBC ash don't by 0%, 20%, 40%, 60%, 80% and 100% proportion substitutes for the first wife to fly the ash F of level compared to the use, with in addition directly uses 0% in the CLSM allocated proportion, 10%, 20%, 30%, 40% and 50% CFBC ash amount used acts as the thin aggregate packing material, carries on various allocated proportions design to mix CLSM to collapse the fluidity, to fall newly sinks the quantity and the different stadium the compressive strength test. This research trial result showed that,Newly mixes in the controlled low strength material allocated proportion the packing material to use CFBC the ash substitution part F level to fly the ash, 28th the days compressive strength it finally request are can conform to the Executive Yuan Publicworks Committee construction summary standard 03377th chapter of stipulation to be smaller than 80kgf/cm2 to stipulate, demonstrated utilizes the CFBC ash in controlled low strength material should for have the potential to perform converting into resources of sideline product the utilization.
Huang, Yu-Ming y 黃御銘. "Using thermal-treated sewage sludge as controllable low-strength cement material : A feasibility study". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/75082785736828983370.
Texto completo國立中山大學
環境工程研究所
104
Along with the developing economy and the growing environmental awareness, the cost of dealing with lives sewage and industrial waste is increasing, and will be increased faster. Nowadays the purpose of dealing with domestic underground sewage, except for final process; if we can use other methods to recycle domestic underground sewage, not noly we can decrease the usage of land volume to bury the waste, but also reach a better effect of recycling the resource. This study plans to use two different processes to deal with the waste, and used the already dealed-with sewage sludge to replace the used fine aggregates in high performance low intensity cement material (CLSM) To investigate the Properties Differences of dealed with stuff, using different processes; and the possibility to replacing nature aggregates to post-making CLSM. Lastly, test the influences to CLSM with different replacing ratios, to find out the best replacing ratio. The result shows that the properties of processed sewage sludge,Toxicity Characteristic Leaching Procedure (TCLP), Volatile Organic Compounds (VOC), Semi Volatile Organic Compounds (SVOC) from Dihua Sewage Treatment Plant and Yeh Ming Industrial are both lower the relative regulatory compliance of industril waste and soil. Regarding solid volatile organice compounds and Three-component, the result shows that due to Yeh Ming Industrial’s heat treatment process equipment operation temperature is higher than Dihua Sewage Treatment Plant’s, therefore, Yeh Ming can effectively transfer organics into inorganics after processing. The result of using processed end product to replace CLSM nature aggregates shows: Using Dihua Sewage Treatment Plant processed end product to replace CLSM sample, when nature aggregates replace rate is 10%, will generate peculiar smell and sample can not meet CLSM’s dry standard regarding 12 hour droptest. So the determination is: Dihua Sewage Treatment Plant’s processed end product is not suitable for replacing CLSM. Where as Yeh Ming Industrial, the tailing material after heat processing, the 10% and 30% nature aggregates replace rate meet CLSM standard in 12-hour drop test and 28-day compression test. But when the nature aggregates replace rate is 50%, the compression density doesn’t meet CLSM standard, and seemed to be broken easily. As the viewpoint of CLSM stand, although the experiment value of 10% nature aggregates replace rate is better than 30% nature aggregates replace rate, due to the purpose of this experiment is to study resource recycling, therefore, the best analysis data of this study is to use 30% nature aggregates replace rate ratio.
Wang, Jhih-Kai y 王致凱. "Application of Co-Firing Fly Ash with Recycled Aggregates on Controlled Low-Strength Material". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/43034585815748675306.
Texto completo國立交通大學
土木工程系所
104
Our country’s energy depend on fossil fuels deeply, where coal accounts for overall energy supply for a large proportion, and coal-fired boilers are also widely used in industry; however, currently, the capacity of the waste landfill for the coal-fired boilers is limited in Taiwan, and the site can not be effectively reused when it saturated, so it is necessary to advocate the coal-fired boiler industry to practice the recycling use of the by-products not only to increase the value and the recyclability of the industrial waste, but to reach the goal of coal reduction, environmental protection and sustainable development, which can lessen the impact on the natural environment. This experiment explores the Fly Ash by Company C , the 25% Co-Firing Fly Ash by Company C , the Bottom Ash by Company Y and recycled coarse aggregate concrete by using these four recycled materials with different ratio into the Controlled Low-Strength Material (CLSM). Additionally, the experiment shows the process of using the recycled aggregates to partially replace the natural coarse and fine aggregates; as for the binder, cement, the fly ash of class F by Formosa Plastic Group, the fly ash by Company C and the 25% co-firing fly ash by Company C are used with compatible ratio to combine with each other. The tests of the research involve 22 different CLSM ratios. The water and binder ratios are 1.02 and the relative humidity of the curing conditions are 100% and 80%. The results are to test whether each ratio under different curing conditions fits the condition of CLSM’s Construction Specifications of Public Works and also to observe the durability. Tests performed for each proportion are: Slump flow test, Ball Drop test, Method of test for the water soluble chloride ion content of fresh concrete, the compressive strength of each age (7, 14, 28, 56, 90 days), the splitting tensile strength of each age (7, 14, 28, 56, 90 days) and strain test of each age (1 to 7, 14, 28, 56, 90 days). Take these results to observe the difference between each CLSM ratios and reference groups. And test whether each ratio fits the condition of CLSM’s Construction Specifications of Public Works. Furthermore through this research to observe the feasibility of recycled materials on CLSM . In order to achieve recycling objectives of sustainable development. Keywords:CLSM, recycled coarse aggregate concrete, recycled aggregates,curing condition
his-ming, Wang y 王錫銘. "Study on Refilled Low Strength Recycle Material are Being Substituted for Near Bridge Abutment". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/90543767861355450742.
Texto completo國立宜蘭大學
土木工程學系碩士班
97
A bridge is a structure built to connect two separate ends to provide passage for people and vehicles. A slab connection is a common auxiliary that connects the bridge deck and the approach. The primary purpose of a slab connection is to connect the bridge abutment with structures on both sides of the abutment and to mitigate differential settlement in refilled soil so that the approach can smoothly connect the bridge deck and the abutment top, providing smooth passage for all vehicles crossing the bridge. Nevertheless, the tops of the said structures are to be refilled to an elevation level equivalent to the bridge deck or the road, using earth, stones or gradation materials. This is to be done after the completion of construction at the abutment top, abutment wall and retaining wall for the approach, for greater convenience in subsequent concreting and bitumen laying of the road surface. However, due to many subjective and objective constrains, the actual rolling compaction process during the refilling cannot achieve a 100% compaction degree, even when the process is implemented in strict accordance with regulations. Therefore, even if a slab connection is adopted as the cushion, the uneven settlement between bridge deck and approach slab may still result in differences in elevation level, degrading the driving experience on the bridge or even jeopardizing user safety. The most common solution for differential settlement between bridge deck and approach slab is the slab connection. However, it has been pointed out in many studies that other solutions are required for the issues caused by a slab connection. These issues are caused by the settlement of the slab connection and the refill materials beneath the slab connection. Therefore, if the properties of the refill materials can be directly improved and the existing in-situ materials can be recycled, settlement can be decreased without using any proprietary instruments, and the smooth joint between bridge deck and approach slab can be guaranteed. This study proposes an improved CLSM that enables use of "low strength recycled materials" in construction in Taiwan, so that solutions can be found for bridge deck construction as well as for issues in future maintenance and management.
Liao, Chung Liang y 廖崇良. "Application of By-products from paper industry with Recycled Aggregates on Controlled Low-Strength Material". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/5t5955.
Texto completo國立交通大學
土木工程系所
104
In recent years, because of the high fuel cost, the factories of the nation have gradually altered the boiler manufacturing process from the fuel oil-fired boilers to the coal-fired boilers; however, currently, there are certain limitations and difficulties in finding and building the waste landfill for the coal-fired boilers in Taiwan. In addition to the lack of the location for the waste landfill and the overexploitation of the natural aggregates in the nation, it is necessary to advocate the coal-fired boiler industry to practice the recycling use of the by-products not only to increase the value and the recyclability of the industrial waste, but to reach the goal of coal reduction, environmental protection and sustainable development, which can lessen the impact on the natural environment. This experiment explores the Fly Ash by Yuen Foong Yu, the Bottom Ash by Yuen Foong Yu, the Bottom Ash by Cheng Loong and recycled coarse aggregate concrete by using these four recycled aggregates with different ratio into the CLSM. Additionally, the experiment shows the process of using the recycled aggregates, YBA, ZBA and recycled aggregate concrete to partially replace the natural coarse and fine aggregates; as for the binder, concrete, the fly ash and YFA are used with compatible ratio to combine with each other. The tests of the research involve 32 different CLSM ratios. The water and binder ratios are 1.08 and 1.16 and the relative humidity of the curing conditions are 100%, 80%, 40% and moist cures for one and three days. The results are to test whether each ratio under different curing conditions fits the condition of CLSM’s Construction Specifications of Public Works and also to observe the durability. Tests performed for each proportion are: Slump flow test, Flow Consistency test, Ball Drop test, Method of test for the water soluble chloride ion content of fresh concrete, the compressive strength of each age (7, 14, 28, 56, 90 days) and strain test of each age (1 to 7, 14, 28, 56, 90 days).
JHANG, BO-JYUN y 張博鈞. "The study of the Water Treatment Sludge on the performance of Controlled Low Strength Material". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/53566036468593359414.
Texto completo國立臺灣科技大學
營建工程系
103
In this study, Water Treatment Sludge used as fine aggregate in Controlled low strength material(CLSM). There are two main parts. The first part is the Cement-based CLSM, which adds small amount of cement, fly ash, slag, and Water Treatment Sludge power then the fresh and harden property are investigated. The results show (1) the addition of Water Treatment Sludge makes the workability decrease, but improves the compressive strength. (2) The addition of Water Treatment Sludge and the accelerator can shorten the initial setting time and ball drop time, which improve the compressive strength. (3) The accelerator can shorten the initial setting time and ball drop time, which improve the early strength development. (4) In the study, the mix design without aggregates have unit weight lower than 2000 kg/m3. (5) Under conditions of water-binder ratio 0.65, adding less than 40% Water Treatment Sludge, and 5% of accelerator, The fresh and harden property standard of the Public Works Department, Taipei City Government can achieved. The second part is alkali-activated CLSM, adding only pozzolan material (slag and fly ash) and Water Treatment Sludge without cement addition, and produced using alkali-activated paste, which can be applied in Controlled Low Strength Material. (1) The results show the addition of Water Treatment Sludge decreases workability, but improving the compressive strength. (2) The addition of Water Treatment Sludge increases the initial setting time and drop ball time. (3) The Alkali Equivalent shorten the initial setting time, drop ball time, but reduce compressive strength. (4) Water-to-solid ratio within 0.9, adding Water Treatment Sludge 10%, and the alkali equivalent of 9%, can approach the fresh and harden property of the Public Works Department, Taipei City Government. (5) Cost Analysis for each group of alkali-activated CLSM shows that adding more Water Treatment Sludge can reduce material costs, and higher alkali equivalents increase material costs.
Tzeng, Yu-Wei y 曾毓威. "The Preliminary Study of Controlled Low Strength Material Using Bottom Ash and Crushed Masonry Aggregate". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/26350608075204831800.
Texto completo朝陽科技大學
營建工程系碩士班
98
The study was conducted in accordance with current design principal of the controlled low strength material (CLSM) to investigate the compression strength of the concrete cylinders using crushed masonry aggregate in replacement of the aggregates from in-situ soils. These soils from field excavation have been commonly used in practice as aggregate materials of concrete mixture for pipeline trench and other excavation backfills. The results of laboratory tests revealed that the strength of the CLSM concrete increases due to use of the crushed masonry aggregate compared with that using aggregates from in-situ soils. The compression strength increases at 17-30%, 13-22% and 4-10% for the CLSM with water/cement ration of 2.0, 2.5, and 3.0, respectively. Based on the test results when the water/cement ratio increases from 2.0 to 3.0, the optimal water/cement ratio beyond which decrease of compression strength due to increasing water/cement ratio becomes less significant is determined to increase from 2.4-2.5 to 2.5-2.6; while the optimal bottom ash content at which compression strength reaches a relative maximum value increases from 35-45% to 45-55%. In addition, the strength development at early stage of the concrete pouring decreases with increasing use of the crushed masonry aggregate. The differences of compression strength between early stage (7-day) and ultimate (28-day) are 0.4-6.5%, 2.7-6.2% and 6.7-12.7% for water/cement ratio of 2.0, 2.5, and 3.0, respectively. For a particular water/cement ratio, the replacement of fine aggregate with bottom ash introduces no significant influence in strength development (within 3%) for the concrete specimens used in the study.
Chiu, Tsung-Jen y 丘宗仁. "A Study on the Controlled Low-Strength Material Quality Determination based on Drilled Cores intensity". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/31113243011326672604.
Texto completo國立交通大學
工學院工程技術與管理學程
99
In construction inspection, the strength quality of general concrete and controlled low-strength material (CLSM) is mainly evaluated based on the compressive strength of cylindrical specimens and drilled core specimens. For testing the compressive strength of cylindrical specimens, CNS 1232 is the specification for general concrete, and ASTM D4832 for CLSM. These two specifications are different because of varied compressive rates. For drilled core sampling, CN1238 is the specification for general concrete, while CNS1232 is applied for testing the compressive strength. Unfortunately, there is no suitable specification for either CLSM drilled core specimen sampling or CLSM compressive test, domestically as well as internationally. Some divisions adopt CNS1238, a specification for general concrete’s drilled core specimens, for CLSM's drilled core specimens, but due to the low-strength attribute of CLSM (under 90kgf/cm2), it is not clear whether CNS1238 is suitable or not. Furthermore, no report with an approval mark from the TAF research office can be provided. For most general concrete after pouring, it is undisturbed by external forces and has to be maintained according to regulations. Bur for CLSM on the other hand, after the initial setting of CLSM in trench backfill of pipeline projects (an early strength type would take 3.5 hours; a general type would take 12 hours), asphalt concrete has to be paved, rolled, and compacted to avoid disturbing the traffic. In contrast to the fact that general concrete is undisturbed and can be maintained by following regulations, those impacts from rolling and compacting as well as traffic loads on CLSM could significantly affect the initial strength development of CLSM. Presently, reduction regulation on the compressive strength of drilled core specimens of CLSM specified in the construction contract of different pipeline divisions is inconsistent. Some contracts allow no reduction while others reduce the required strength to 85% or 75% of the drilled core strength of general concrete and treat this value as a reference value for quality. This on-site study took place at pipeline projects in Hsinghsu City and County, which is under the jurisdiction of Taiwan Water Corporation Third Branch. Treated as the control group, CLSM specimens from pre-mixed concrete fields were used for a pre-mixed experiment. CLSM specimens from trench backfill construction sites, i.e., the experimental group, were used for an on-site experiment. CLSM Cylindrical specimens as well as drilled core specimens were obtained, and they were tested for over 28-day compressive strength in order to analyze the degree of strength reduction of drilled core specimens. The authors discussed the appropriateness of using drilled core strength as a quality determinant in CSLM construction inspection based on the acquired data.
Weng, Ming Wei y 翁明偉. "The Feasibility of Desulfurization/Granulated Slag Resources Recovery on the Controlled Low Strength Material WithoutPortland Cement". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/81274797448076799696.
Texto completo國立高雄應用科技大學
土木工程與防災科技研究所
95
Desulfurization slag, steel-making procedure in The Chinese Steel Company, is the general industrial wastes that can utilize again. It can be regarded as the soda catalyst of granulated slag to proceed pozzolanic reaction, because which is a material of the high pH, content of the heavy metal is rare, content of high CaO and compositions are similar to portland cement. This investigate is an experimental studies of slag cement mortar/CLSM made with granulated/desulfurization slag and without Portland cement, and the natural aggregate be replaced with desulfurization slag aggregate. The important physical-chemical properties needed to be analyzed, including fundamental properties, composition and micro nature of the material, and fresh, hardening, and micro-structure of slag cement mortar/CLSM. The test results show that desulfurization slag can offer enough soda environment, make granulated slag proceed pozzolanic reaction. The content and fineness of granulated slag increased will cause quick setting. And content of desulfurization slag will shorten the spacing interval of initial and final setting time. In addition, the mortar which made with stone, at 28-days compressive strength reaches 42~104 kgf/cm2. The majority can accord with CLSM that 28-days compressive strength does not exceed 84 kgf/cm2. Observation of SEM and XRD, hydrate is mainly calcium carbonate, C-A-M-S crystal and continuous netted gel. And influence of compressive strength is about with whether or not be restrained changed hydrate into C-S-H gel and content of Ca(OH)2. Initial setting time of CLSM is between 7~12.5 hours, it accords with the regulation of normal CLSM. Slump, slump flow and 28-days compressive strength is between 24~28 cm, 49.5~84.0 cm, and 15~27 kgf/cm2 respectively, it accords with the regulation of non-normal CLSM. And the compressive strength increasing degree of later age is small. It accords with the definition of easy re-excavate of CLSM. So the result of study proves the all right recycle treatment of granulated slag and desulfurization slag is in concrete without Portland cement, and applies to CSLM actually.
Lu, Sung-Chi y 呂松吉. "The Study of Controlled Low Strength Material Using Sandy Soils from Trench Excavation Mixed with Bottom Ash". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/d9fa6b.
Texto completo朝陽科技大學
營建工程系碩士班
96
The study was designed to investigate the mechanical properties of controlled low strength material (CLSM) with the use of re-cycled construction materials such as sandy soils from trench excavation and bottom ash from power plant furnace. A series of tests were conducted at 3 water/cement ratios (1.41, 1.71, and 2.18) and sand soils mixed with bottom ash for selected volume percentages (100:0, 80:20, and 60:40). The results of study indicated that the compressive strength of CLSM is mainly dependent upon the w/c ratio. The lower w/c ration resulted in higher strength of CLSM, especially when w/c ratio is smaller than about 1.6~1.75, the strength increases even more significantly. The results of study also revealed that strength of CLSM also increases with increasing volume percentage of the bottom ash. However, the study preliminarily concluded that the increase tends to become lesser when the bottom ash is greater than about 20-25%. In addition, the results of the study also revealed a preliminary finding that when w/c ratio is smaller than 2.5, the strength of CLSM could be enhanced by properly increasing the volume percentage of bottom ash. This water/cement ratio of 2.5 should be confirmed by further tests and study. For the practical application of the CLSM in the field, the study suggested that w/c ratio between 1.4-2.2 and volume percentage of bottom ash between 20-40% may be used in accordance with project requirements in terms of strength and workability.
Luo, Yun-Yi y 羅允憶. "An Experimental Study on the Controlled Low-Strength Material Using the Bottom Ash of Kaohsiung Area Incinerators". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/36474518113598064969.
Texto completo國立屏東科技大學
土木工程系所
95
Incineration is considered to be one of the best ways among intermediate treatment technology, because it can dispose the waste effectively, improve the passion regression, and arrive to the aim of reduction and recovery. However, it is the tough issue on how to deal with the incinerator bottom ash produced by incineration. Recently, people realized the importance of environmental protection, and government required strongly about the maintenance of the ecological environment. The old way that deals with incineration bottom ash by solidification landfill is out of time. Furthermore, the land for filling is insufficient and it is difficult to get the landfill. Therefore, how to find the best way to make the reusing reasonable and efficient is to be of great urgency. Controlled Low-Strength Material is a new self-compacting backfill material, which can take place of size gradation. The basic raw material of CLSM includes cement, water, pozzolan, coarse aggregate and fine aggregate. The high water-to-cement ratio and the large amount of aggregate result in the low strength and the high flowing of CLSM, which is different from general concrete. For general concrete, the higher the strength, the better the quality; by ACI, if only the unconfined compressive strength is required to be no more than 8.4 MPa in 28 days,The requirement for aggregate is not a mandatory. The materials which meet the previous experiment can be applied even if not the standard ones. This study adopts the material (bottom ash) which is provided by Kaohsiung County Southern、Gangshan、Renwu District Waste Management Plant, makes the Specimen mixture by same cement content and different water-to-cement ratio, explores to arrive the aim of whose correction flowability is more than 20cm, initial setting time is in 36 hours and the 28 days unconfined compressive strength is no more than 8.4MPa, and probes into the different influence on the strength of CLSM by mixture bottom ash among factories and the difference of engineering property.
Cheng, Wei-Kang y 程維康. "The Influence of Bottom Ash Ratio and Cement Ratio on the Long-term Strength of Controlled Low Strength Material Using Trench Excavation Sandy Soils". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/60779442726753020798.
Texto completo朝陽科技大學
營建工程系碩士班
96
The research was conducted to investigate the short term (28 days) and long term (60 days) strength of the controlled low strength material (CLSM) using the re-cycled materials including the sandy soils from pipe trench excavation and bottom ash from furnace of power plants. The sandy soil from trench excavations was washed and sieved to exclude sizes larger than 3/8” before the specimens were prepared with parameters of selected water cement ratios (3.2, 2.7,2.18,1.71,1.41, and 1.1) and bottom ash ratios (0, 20, 40, 60, 80, and 100%). The initial setting time of the CLSM specimens tested ranged from 12 to 36 hours which satisfy the specifications for the field operation. The results of the tests indicate that when the water cement ratio (w/c ratio) is less than 2.14, the 28-day strength of the CLSM increases more significantly up to 403% of that for w/c ratio=3.2. In addition, the 28-day strength reached the maximum when bottom ash ratio is around 50%, which is up to 141% of that for 0%bottom ash. This implies that decreasing the w/c ratio may be a main factor for increasing the short term strength of the CLSM, using the test results of w/c ratios of 2.7, 1.71 and 1.1 and bottom ash ratios of 60, 80 and 100%. The test results also indicated that the long term strength is still under development within 60 days with an increase from 3.9% to 29.95% of the 28-day strength. The significant long term strength development in some cases should be considered in the practical applications of the CLSM.
Yu, Bo-Syun y 余柏勲. "Design and Model Free Predictive Current Control for Brushless Direct Current Motors with Low Rare Earth Material". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/5zc749.
Texto completo國立臺灣海洋大學
系統工程暨造船學系
102
In operation, cogging torque of the motor generates torque ripple, further noise, vibration or shaking, etc. These problems not only affect motor’s performance and life, but also can be used in high-precision control of machinery. In order to solve problems of cogging torque, and improve the interaction of magnetic circuit in the motor. By the micro-structure, reduced the motor usage of rare earth material Through a simple parameter setting, complete the fast simulation analysis to understand the impact of micro-groove structure on the cogging torque. The controller use model free predictive current control(MFPCC) to drive BLDC motor. The MFPCC has insensitive to the motor parameters different form model base predictive current control. The current sampling once before change the switch state. It can avoid current surge when switching state. Application of the brushless DC motor drive will check the feasibility in computer. The tracking current capability by MFPCC compare to model base predictive current control(MBPCC). Completion of the drive control system simulation.
Lin, Han Ching y 林漢清. "The Study of A New Class of Low Surface Free Energy Material and Reversible Wettability Control between Superhydrophobicity and Hydrophilicity". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/66336077769950104757.
Texto completo國立交通大學
應用化學系所
95
Abstract In this study, we focus on three major subjects which based on non-fluorine low surface energy materials: 1. Thermal and Surface Properties of Phenolic Nanocomposites Containing Octaphenol Polyhedral Oligomeric Silsesquioxane POSS (Polyhedral Oligomeric Silsesquioxane) molecule, which contains organic substituents on its outer surface that make the POSS nanostructure compatible with polymers, arouse much attention in recent years. We synthesized a new polyhedral oligomeric silsesquioxane (POSS) containing eight phenol functional groups and copolymerized it with phenol and formaldehyde to form a novolac type phenolic/POSS nanocomposites containing high thermal and low surface energy properties. The incorporation of POSS leads to the formation of a surface barrier that minimized the direct contact of the polar phenolic units with the air. The presence of such a barrier not only enhanced the thermal stability of the bulk and surface of these POSS-containing composites but also led to the surface energy being maintained after treatment at high temperature. 2. Effect of Intermolecular Hydrogen Bonding on Low-Surface-Energy Material of Poly(vinyl phenol) We discovered that the poly(vinyl phenol) (PVPh) possesses extremely low surface energy (15.7 mJ/m2) after a simple thermal treatment procedure, even lower than the poly(tetrafluoroethylene) (PTFE) (22.0 mJ/m2) calculated based on the two-liquid geometric method. In addition, we also compared surface energies of PVPh-co-PS copolymers (random and block) and their corresponding blends, these random copolymers possess the lowest fraction of the intermolecular hydrogen bonding and surface energy than the corresponding block copolymers or blends after similar thermal treatment. This finding provides a unique and easy method to prepare a low-surface-energy material through simple thermal treatment procedure without using fluoro-polymers or silicones. 3. Reversible Wettability of a Polybenzoxazine-Silica Hybrid Surface between Superhydrophobicity and Hydrophilicity Recently, reversibly controlling the surface wettability has aroused great interest and been demonstrated by various methods, however, multistep processes, stringent preparation specification, and the high cost of forming large-area environmentally responsive surfaces have heretofore limited their practical applications. Herein, we report on a simple two step process to create a roughness-enhanced solvent responsive wettability of a polybenzoxazine-silica hybrid surface. The silica nanoparticles modified with hydroxyl groups should be able to express hydrophilicity by responding to external stimuli. Reversible switching between superhydrophobicity and hydrophilicity can be achieved by repeatedly immersing the surface into selective solvents and drying it in vacuum.
Tang, Zhenghua. "Optimising the transformation and yield to ultimate strength ratio of Nb-Ti micro-alloyed low carbon line pipe steels through alloy and microstructural control". Thesis, 2007. http://hdl.handle.net/2263/26466.
Texto completoThesis (PhD (Metallurgical Engineering))--University of Pretoria, 2007.
Materials Science and Metallurgical Engineering
PhD
unrestricted