Дисертації з теми "Fly ash concrete"
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Jin, Na. "Fly Ash Applicability in Pervious Concrete." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1279136103.
Повний текст джерелаYousef, Shebani A. "Durability of Incinerator Fly Ash Concrete." Thesis, Coventry University, 2015. http://curve.coventry.ac.uk/open/items/72f1ced3-5b19-470d-a0a8-06ebadc81d08/1.
Повний текст джерелаBortz, Brandon Stallone. "Salt-scaling durability of fly ash concrete." Thesis, Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/3878.
Повний текст джерелаHung, Hsien-Hsin. "Properties of high volume fly ash concrete." Thesis, University of Sheffield, 1997. http://etheses.whiterose.ac.uk/14441/.
Повний текст джерелаHardjito, Djwantoro. "Studies of fly ash-based geopolymer concrete." Thesis, Curtin University, 2005. http://hdl.handle.net/20.500.11937/634.
Повний текст джерелаHardjito, Djwantoro. "Studies of fly ash-based geopolymer concrete." Curtin University of Technology, Dept. of Civil Engineering, 2005. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=18580.
Повний текст джерелаNapthalene-based superplasticiser was found to be ii useful to improve the workability of fresh fly ash-based geopolymer concrete, as well as the addition of extra water. The main parameters affecting the compressive strength of hardened fly ash-based geopolymer concrete are the curing temperature and curing time, the molar H2O-to-Na2O ratio, and mixing time. Fresh fly ash-based geopolymer concrete has been able to remain workable up to at least 120 minutes without any sign of setting and without any degradation in the compressive strength. Providing a rest period for fresh concrete after casting before the start of curing up to five days increased the compressive strength of hardened concrete. The elastic properties of hardened fly ash-based geopolymer concrete, i,e. the modulus of elasticity, the Poisson’s ratio, and the indirect tensile strength, are similar to those of ordinary Portland cement concrete. The stress-strain relations of fly ash-based geopolymer concrete fit well with the expression developed for ordinary Portland cement concrete.
Deb, Partha Sarathi. "Durability of fly ash based geopolymer concrete." Thesis, Curtin University, 2013. http://hdl.handle.net/20.500.11937/2126.
Повний текст джерелаChelberg, Matthew. "The Effect of Fly Ash Chemical Composition on Compressive Strength of Fly Ash Portland Cement Concrete." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555611247091087.
Повний текст джерелаMatenda, Amanda Zaina. "GEOPOLYMER CONCRETE PRODUCTION USING COAL ASH." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1654.
Повний текст джерелаSahmaran, Mustafa. "Self-compacting Concrete With High Volumes Of Fly Ash." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12606896/index.pdf.
Повний текст джерелаSimms, Scott A. "Use of coal fly ash in asphalt concrete mixes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0024/MQ31639.pdf.
Повний текст джерелаAbdalhmid, Jamila M. A. "Drying shrinkage of self-compacting concrete incorporating fly ash." Thesis, University of Bradford, 2019. http://hdl.handle.net/10454/17455.
Повний текст джерелаMinistry of Higher Education, Libya
Mackechnie, James Ronald. "The durability of fly ash concrete in marine and softwater environments." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/18788.
Повний текст джерелаMukheibir, Pierre Victor. "The deformation properties of concrete with classified Lethabo fly ash." Master's thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/15944.
Повний текст джерелаIt has become necessary to determine the magnitude of creep, shrinkage, elastic and thermal deformations of concrete as these characteristics determine the loss of prestressing in prestressed concrete and affect the deflections with time of large concrete sections. Much of the literature available on this topic has conflicting conclusions. In this research, the effect of fly ash was first investigated with regard to general concrete properties such as bleeding, early set, workability, mortar excess and compressive strength. Classified Lethabo fly ash and local Western Cape materials were used for this work. With the increase in the percentage fly ash present in the concrete mix, the water requirement was reduced in order to get the same workability. This characteristic reduced the amount of water available for bleeding. For a given C/W ratio the inclusion of fly ash in a concrete mix had no effect on the mortar excess. The early setting time was retarded for mixes with increasing percentages of fly ash. Higher cementitious material to water ratios were required for concrete with classified Lethabo fly ash than Ordinary Portland Cement mixes, to obtain the same 28 day compressive strength. The fly ash mixes had higher strength developments with time i.e. they have lower early strengths and higher long term strengths than OPC mixes for the same 28 day compressive strengths. Having developed a wide range of concrete mixes, the main investigation was done on specific deformation properties of concrete such as the elasticity, shrinkage, creep and thermal movement. The effect of different wet curing durations and testing ages on these properties were investigated. The elastic modulus was determined by both static and dynamic test methods. A relationship was established between the two methods to estimate the static modulus from the dynamic modulus, which was quicker to perform. In this thesis, the elastic modulus was not affected by the presence of fly ash. The elastic properties of the fly ash mixes was found to be similar to that of the OPC mixes of the same compressive strength. Similarly, the drying shrinkage and thermal movement were not affected noticeably by the presence of fly ash. The volume of aggregate was not a variable as it did not change when fly ash was added to the mix. An attempt was made to develop a test to determine the plastic shrinkage of an unrestrained sample. The effect of fly ash on the plastic shrinkage was not investigated fully. For the creep of concrete, it was established that mixes containing fly ash have lower creep factors than OPC concretes, although no clear trends were apparent for increasing percentages of fly ash. The effect of fly ash in pump mixes was also investigated and the same trends were apparent, although in general, the pump mixes had higher creep factors than the normal mixes. The curing of concrete is critical if good quality concrete is to be obtained. For all deformation properties, the longer a specimen was wet cured, the lower were the deformations. With longer wet curing, a larger volume of hydrated gel developed which gave higher compressive strengths and more rigidity within the matrix. The conclusion reached in this thesis was that the presence of classified Lethabo fly ash did not noticeably affect the deformation properties of the concrete for equivalent compressive strengths. Where some effects were noticed, the fly ash concretes displayed somewhat lower deformations.
Burden, Donald. "The durability of concrete containing high levels of fly ash." Skokie, Ill. : Portland Cement Association, 2006. http://www.cement.org/bookstore/profile.asp?itemid=SN2989.
Повний текст джерелаGogol, Volker R. "The compressive strength of fly ash concrete and its mineralogy." Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/8457.
Повний текст джерелаThe use of fly ash as a cement extender in portland cement concrete is well established. Strict requirements are set for the fly ash on its physical properties and chemical composition to ensme its successful application as a partial replacement material for cement. An investigation was undertaken into the effectiveness and properties of a high carbon clinker ash when used as a cement extender at a 30 direct mass to mass substitution for portland cement. The clinker ash came from the Van Eck power station in Windhoek, Namibia and was milled to pass a 63micron sieve. For comparison fly ashes from the Escom power stations of Lethabo, Duvha and Matla were used. Both concrete and pure paste specimens were prepared for the evaluations.
Deb, Partha Sarathi. "Properties of Geopolymer Concrete Using Ultrafine Fly Ash and Nanosilica." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/75529.
Повний текст джерелаJerban, Majid. "Performance of concrete incorporating amorphous silica residue and biomass fly ash." Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/9807.
Повний текст джерелаAbstract : Cement manufacturing industry is one of the carbon dioxide emitting sources. The global cement industry contributes about 7% of greenhouse gas emission to the earth’s atmosphere. In order to address environmental effects associated with cement manufacturing and constantly depleting natural resources, there is necessity to develop alternative binders to make sustainable concrete. Thus, many industrial by-products have been used to partially substitute cement in order to generate more economic and durable concrete. The performance of a cement additive depends on kinetics hydration and synergy between additions and Portland cement. In this project, two industrial by-products are investigated as alternative supplementary cementitious materials (ASCMs), non-toxic amorphous silica residue (AmSR) and wastepaper sludge ash (WSA). AmSR is by-product of production of magnesium from Alliance Magnesium near of Asbestos and Thetford Mines Cities, and wastepaper sludge ash is by-product of combustion of de-inking sludge, bark and residues of woods in fluidized-bed system from Brompton mill located near Sherbrooke, Quebec, Canada. The AmSR is new industrial by-products. Recently, wastepaper sludge ash has been used as cementitious materials. Utilization of these ashes as cementitious material in concrete manufacturing leads to reduce the mechanical properties of concretes. These problems are caused by disruptive hydration products of biomass fly ash once these ashes partially blended with cement in concrete manufacturing. The pre-wetting process of WSA before concrete manufacturing reduced disruptive hydration products and consequently improved concrete mechanical properties. Approaches for investigation of WSA in this project consist on characterizing regular and pre-wetted WSA, the effect of regular and pre-wetted WSA on performance of mortar and concrete. The high content of amorphous silica in AmSR is excellent potential as cementitious material in concrete. In this project, evaluation of AmSR as cementitious materials consists of three steps. Characterizing and determining physical, chemical and mineralogical properties of AmSR. Then, effect of different rates of replacement of cement by AmSR in mortar. Finally, study of effect of AmSR as partial replacement of cement in different concrete types with binary and ternary binder combinations. This study revealed that high performance concrete (HPC) incorporating AmSR showed similar mechanical properties and durability, compared to control mixture. AmSR improved mechanical properties and durability of ordinary concrete. Self-consolidating (SCC) concrete incorporating AmSR was stable, homogenous and showed good mechanical properties and durability. AmSR had good synergy in ternary binder combination with other supplementary cementitious materials (SCMs). This study showed AmSR can be use as new cementitious materials in concrete.
Nath, Pradip. "Study of fly ash based geopolymer concrete cured in ambient condition." Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/190.
Повний текст джерелаOlivia, Monita. "Durability related properties of low calcium fly ash based geopolymer concrete." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/506.
Повний текст джерелаCheema, Didar Singh. "Low calcium fly ash based geopolymer concrete: Long term durability properties." Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/2146.
Повний текст джерелаFizette, Hobson H. "Development of concrete composites by synergistically using Illinois PCC Bottom Ash and Class F Fly Ash /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1328063751&sid=8&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Повний текст джерелаRyno, Barnard. "Mechanical properties of fly ash/slag based geopolymer concrete with the addition of macro fibres." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95866.
Повний текст джерелаENGLISH ABSTRACT: Geopolymer concrete is an alternative construction material that has comparable mechanical properties to that of ordinary Portland cement concrete, consisting of an aluminosilicate and an alkali solution. Fly ash based geopolymer concrete hardens through a process called geopolymerisation. This hardening process requires heat activation of temperatures above ambient. Thus, fly ash based geopolymer concrete will be an inadequate construction material for in-situ casting, as heat curing will be uneconomical. The study investigated fly ash/slag based geopolymer concrete. When slag is added to the matrix, curing at ambient temperatures is possible due to calcium silicate hydrates that form in conjunction with the geopolymeric gel. The main goal of the study is to obtain a better understanding of the mechanical properties of geopolymer concrete, cured at ambient temperatures. A significant number of mix variations were carried out to investigate the influence that the various parameters, present in the matrix, have on the compressive strength of fly ash/slag based geopolymer concrete. Promising results were found, as strengths as high as 72 MPa were obtained. The sodium hydroxide solution, the slag content and the amount of additional water in the matrix had the biggest influence on the compressive strength of the fly ash/slag based geopolymer concrete. The modulus of the elasticity of fly ash/slag based geopolymer concrete did not yield promising results as the majority of the specimens, regardless of the compressive strength, yielded a stiffness of less than 20 GPa. This is problematic from a structural point of view as this will result in large deflections of elements. The sodium hydroxide solution had the most significant influence on the elastic modulus of the geopolymer concrete. Steel and polypropylene fibres were added to a high- and low strength geopolymer concrete matrix to investigate the ductility improvement. The limit of proportionality mainly depended on the compressive strength of the geopolymer concrete, while the amount of fibres increased the energy absorption of the concrete. A similar strength OPC concrete mix was compared to the low strength geopolymer concrete and it was found that the OPC concrete specimen yielded slightly better flexural behaviour. Fibre pull-out tests were also conducted to investigate the fibre-matrix interface. From the knowledge gained during this study, it can be concluded that the use of fly ash/slag based geopolymer concrete, as an alternative binder material, is still some time away as there are many complications that need to be dealt with, especially the low modulus of elasticity. However, fly ash/slag based geopolymer concrete does have potential if these complications can be addressed.
AFRIKAANSE OPSOMMING: Geopolimeerbeton is ‘n alternatiewe konstruksiemateriaal wat vergelykbare meganiese eienskappe met beton waar OPC die binder is, en wat bestaan uit ‘n aluminosilikaat en ‘n alkaliese oplossing. Vliegas-gebaseerde geopolimeerbeton verhard tydens ‘n proses wat geopolimerisasie genoem word. Hierdie verhardingsproses benodig hitte-aktivering van temperature hoër as dié van die onmiddellike omgewing. Gevolglik sal vliegas-gebaseerde geopolimeerbeton ‘n ontoereikende konstruksiemateriaal vir in situ gietvorming wees, aangesien hitte-nabehandeling onekonomies sal wees. Die studie het vliegas/slagmentgebaseerde geopolimeerbeton ondersoek. Wanneer slagment by die bindmiddel gevoeg word, is nabehandeling by omliggende temperature moontlik as gevolg van kalsiumsilikaathidroksiede wat in verbinding met die geopolimeriese jel vorm. Die hoofdoel van die studie was om ‘n beter begrip te kry van die meganiese eienskappe van geopolimeerbeton, wat nabehandeling by omliggende temperature ontvang het. ‘n Aansienlike aantal meng variasies is uitgevoer om die invloed te ondersoek wat die verskeie parameters, aanwesig in die bindmiddel, op die druksterkte van die vliegas/slagmentgebaseerde geopolimeerbeton het. Belowende resultate is verkry en sterktes van tot so hoog as 72 MPa is opgelewer. Daar is gevind dat die sodiumhidroksiedoplossing, die slagmentinhoud en die hoeveelheid water in die bindmiddel die grootste invloed op die druksterkte van die vliegas/slagmentgebaseerde geopolimeerbeton gehad het. Die styfheid van die vliegas/slagmentgebaseerde geopolimeerbeton het nie belowende resultate opgelewer nie. Die meeste van die monsters, ongeag die druksterkte, het ‘n styfheid van minder as 20 GPa opgelewer. Vanuit ‘n strukturele oogpunt is dit problematies, omdat groot defleksies in elemente sal voorkom. Die sodiumhidroksiedoplossing het die grootste invloed op die styfheid van die vliegas/slagmentgebaseerde geopolimeerbeton gehad. Staal en polipropileenvesels is by ‘n hoë en lae sterke geopolimeer beton gevoeg om die buigbaarheid te ondersoek. Die die maksimum buigbaarheid het hoofsaaklik afgehang van die beton se druksterkte terwyl die hoeveelheid vesels die beton se energie-opname verhoog het. ‘n OPC beton mengsel van soortgelyke sterkte is vergelyk met die lae sterkte geopolimeerbeton en daar is gevind dat die OPC beton ietwat beter buigbaarheid opgelewer het. Veseluittrektoetse is uitgevoer om die veselbindmiddel se skeidingsvlak te ondersoek. Daar kan tot die gevolgtrekking gekom word dat, alhoewel belowende resultate verkry is, daar steeds sommige aspekte is wat ondersoek en verbeter moet word, in besonder die styfheid, voordat geopolimeerbeton as ‘n alternatiewe bindmiddel kan optree. Volgens die kennis opgedoen tydens hierdie studie, kan dit afgelei word dat die gebruik van vliegas/slagmentgebaseerde geopolimeerbeton, as 'n alternatiewe bindmiddel, nog 'n geruime tyd weg is, as gevolg van baie komplikasies wat gehandel moet word, veral die lae elastisiteitsmodulus. Tog het vliegas/slagmentgebaseerde geopolimeerbeton potensiaal as hierdie komplikasies verbeter kan word.
Islam, G. "Evaluating reactivity and sorptivity of fly ash for use in concrete construction." Thesis, University of Dundee, 2012. https://discovery.dundee.ac.uk/en/studentTheses/94122abd-aa82-4c91-85ea-079505e14489.
Повний текст джерелаKothari, Ankit. "Effects of Fly Ash on the properties of Alkali Activated Slag Concrete." Thesis, Luleå tekniska universitet, Geoteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63534.
Повний текст джерелаChang, Ee Hui. "Shear and bond behaviour of reinforced fly ash-based geopolymer concrete beams." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/468.
Повний текст джерелаChang, Ee Hui. "Shear and bond behaviour of reinforced fly ash-based geopolymer concrete beams." Curtin University of Technology, Department of Civil Engineering, 2009. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=120482.
Повний текст джерелаResearch on the development, manufacture, behaviour and applications of low calcium fly ash-based geopolymer concrete has been carried out at Curtin University of Technology since 2001. Past studies of the structural behaviour of reinforced fly ash-based geopolymer concrete members have covered the flexural behaviour of members. Further studies are needed to investigate other aspects of the structural behaviour of geopolymer concrete. Design for both shear and bond are important in reinforced concrete structures. Adequate shear resistance in reinforced concrete members is essential to prevent shear failures which are brittle in nature. The performance of reinforced concrete structures depends on sufficient bond between concrete and reinforcing steel. The present research therefore focuses on the shear and bond behaviour of reinforced low calcium fly ash-based geopolymer concrete beams.
For the study of shear behaviour of geopolymer concrete beams, a total of nine beam specimens were cast. The beams were 200 mm x 300 mm in cross section with an effective length of 1680 mm. The longitudinal tensile reinforcement ratios were 1.74%, 2.32% and 3.14%. The behaviour of reinforced geopolymer concrete beams failing in shear, including the failure modes and crack patterns, were found to be similar to those observed in reinforced Portland cement concrete beams. Good correlation of test-to-prediction value was obtained using VecTor2 Program incorporating the Disturbed Stress Field Model proposed by Vecchio (2000). An average test-to-prediction ratio of 1.08 and a coefficient of variation of 8.3% were obtained using this model. It was also found that the methods of calculations, including code provisions, used in the case of reinforced Portland cement concrete beams are applicable for predicting the shear strength of reinforced geopolymer concrete beams.
For the study of bond behaviour of geopolymer concrete beams, the experimental program included manufacturing and testing twelve tensile lap-spliced beam specimens. No transverse reinforcement was provided in the splice region. The beams were 200 mm wide, 300 mm deep and 2500 mm long. The effect of concrete cover, bar diameter, splice length and concrete compressive strength on bond strength were studied. The failure mode and crack patterns observed for reinforced geopolymer concrete beams were similar to those reported in the literature for reinforced Portland cement beams. The bond strength of geopolymer concrete was observed to be closely related to the tensile strength of geopolymer concrete. Good correlation of test bond strength with predictions from the analytical model proposed by Canbay and Frosch (2005) were obtained when using the actual tensile strength of geopolymer concrete. The average ratio of test bond strength to predicted bond strength was 1.0 with a coefficient of variation of 15.21%. It was found that the design provision and analytical models used for predicting bond strength of lapsplices in reinforced Portland cement concrete are applicable to reinforced geopolymer concrete beams.
Lee, William K. "Solid-gel interactions in geopolymers." Connect to thesis, 2002. http://repository.unimelb.edu.au/10187/1071.
Повний текст джерелаGeopolymerisation is such a ‘green’ technology capable of turning both natural ‘virginal’ aluminosilicates and industrial aluminosilicate wastes, such as fly ash and blast furnace slag, into mechanically strong and chemically durable construction materials. However, the source materials for geopolymer synthesis are less reactive than Portland cement clinkers and the chemical compositions of these source materials can vary significantly. Consequently, product quality control is a major engineering challenge for the commercialisation of geopolymers.
This thesis is therefore devoted to the mechanistic understanding of the interfacial chemical interactions between a number of natural and industrial aluminosilicates and the various activating solutions, which govern the reactivity of the aluminosilicate source materials. The effects of activating solution alkalinity, soluble silicate dosage and anionic contamination on the reactivity of the aluminosilicate source materials to produce geopolymeric binders, as well as their bonding properties to natural siliceous aggregates for concrete making, are examined. In particular, a new set of novel ‘realistic’ reaction models has been developed for such purposes. These reaction models have been further utilised to develop a novel analytical procedure, which is capable of studying geopolymerisation on ‘real’ geopolymers in situ and in real time. This novel procedure is invaluable for the total understanding of geopolymerisation, which is in turn vital for effective geopolymer mix designs.
Bleszynski, Roland F. "Study of the effects of fly ash on alkali-silica reaction in concrete." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0024/MQ51606.pdf.
Повний текст джерелаAbu, Bakar Asif. "Effects of Nano Silica and Basalt Fibers on Fly Ash Based Geopolymer Concrete." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/31729.
Повний текст джерелаUpadhyaya, Sushant. "Early age strength prediction for high volume fly ash concrete using maturity modeling." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8868.
Повний текст джерелаThesis research directed by: Dept. of Civil and Environmental Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Williams, Franklin. "The formation of geopolymer concrete from bauxite-refining residue and fly ash: Application in sustainable concrete production." Thesis, Williams, Franklin (2021) The formation of geopolymer concrete from bauxite-refining residue and fly ash: Application in sustainable concrete production. Honours thesis, Murdoch University, 2021. https://researchrepository.murdoch.edu.au/id/eprint/63765/.
Повний текст джерелаPuri, Rajnish. "Development of High performance Concrete Composites Using Class F Fly Ash and PCC Bottom Ash, and a Statistical Model to Predict Compressive Strength of Similar Concrete Composites." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1123.
Повний текст джерелаTackett, Paul M. "Evaluation of concrete strength and permeability with time." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/15733.
Повний текст джерелаDepartment of Civil Engineering
Kyle Riding
The relationship between in-place concrete strength and permeability with concrete cylinder strength and permeability with time is of interest - especially when supplementary cementitious materials (SCMs) are used. A joint research project between The University of Kansas was undergone to quantify these relationships. The permeability of concrete is directly tied to its ability to mitigate certain failure mechanisms such as corrosion and sulfate attack. The three concrete mixtures being tested by Kansas State University (KSU) vary in cementitious content as follows: (1) 100% ordinary portland cement (OPC), (2) 25% Class F fly ash (F-ash) and 75% OPC, (3) 25% Class C fly ash (C-Ash) and 75% OPC. The mixtures were also placed in three different seasons to present differing curing environmental effects. The summer slabs were cast during July and August. The fall slabs were cast in October and November. The final set of slabs were cast in March and April. Three sets of concrete specimens (lab cured, field cured and in-situ core specimens) were tested at 28, 56, 90, 180, and 360 days for strength and permeability properties. The permeability performance tests being utilized are ASTM C1202 and ASTM C642. The results have shown very desirable permeability and strength data for the mixes using blended fly ash cements. The F-ash exhibited the best high early strength and low permeability data for the summer placement season and slower strength and permeability performance at cold weather. The C-ash performed the best overall for all seasons and had the least environmental effects. The OPC performed the worst in regards to permeability and did not reach as high long term strength.
Sharma, Rohit Kumar. "High Volume Fly Ash Concrete." Thesis, 2018. http://ethesis.nitrkl.ac.in/9550/1/2018_MT_216CE3074_RKShrama_High.pdf.
Повний текст джерелаKhuito, Murumi. "Enhancing fly ash utlisation in concrete." Thesis, 2017. http://localhost:8080/iit/handle/2074/7328.
Повний текст джерелаLin, Sih-Ming, and 林思明. "Chlorid Transport Behavior in Fly Ash Concrete." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/21825321722733020398.
Повний текст джерела國立臺灣海洋大學
材料工程研究所
103
The RCPT(Rapid chloride permeability test) usually used to estimate the concrete's durability . If we use fly ash to replace cement mix with concrete,the total electricity will drop significantly in RCPT. The reason result in this situation is the fly ash's granular structure is smaller than cement,it will change the structure in concrete and consume the Hydroxide ions in concrete simultaneously. To evaluate the criteria of total charge and adjust the method of total charge in the Fly ash concrete by using Rapid Chloride Permeability Test (RCPT) in this study.There are four tests in this study which are the test of compressive strength, test of rapid chloride ion penetration (Rapid chloride penetration test :RCPT ) , test of chloride non-steady-state migration coefficient (Chloride migration coefficient from non-steady-state migration experiments :RCM ),test of chloride ion penetration speed (Accelerated chloride migration test :ACMT ),and test of salt storage (Ponding test ). There are some results below showed that in this study , fly ash concrete in the amount of fly ash to replace 40% of the transmission coefficient, diffusion coefficient and compressive strength without adding fly ash concrete than good, to resist chloride ion invasion have good benefits. Though “RCPT total charge and RCPT transmission coefficient diagram ˮ, “RCPT total charge and RCM non-steady-state migration coefficient diagram ˮ, “RCPT total charge and Ponding test diffusion coefficient diagram ˮ, “RCPT total charge and Ponding test permeation depth diagram ˮwe design four kinds of methods to adjust total charge. Among all, The results of the "RCPT total charge and RCPT transmission coefficient diagram assessment methods" and "RCPT total charge and RCM non-steady-state migration coefficient diagram assessment methods"are similar. If using both of the ways at the same time to assess the fly ash concrete, it could effectively determine the durability of fly ash concrete than using only one way.
Liu, Yen-Chih, and 劉彥志. "Chloride transport bebavior in Fly Ash Concrete." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54295729791233436149.
Повний текст джерела國立臺灣海洋大學
材料工程研究所
99
In this study, Taichung, Taiwan power Co. plant in Class F fly ash, The percentage of fly ash to replace cement by weight of 0%, 20%, 30%, 40%, 50%, 60% and 70%, Used in water-cement ratio 0.35,0.45,0.55 and 0.65 of the concrete, to explore the impact of transport behavior of concrete. Assessment project using the rapid chloride ion penetration test (Rapid chloride penetration test; RCPT), chloride ion transport speed test (Accelerated chloride migration test; ACMT), salt storage test (Ponding test) and compressive strength. Comprehensive test results of concrete specimens 91 days after the curing period, fly ash concrete in the amount of fly ash to replace 40% of the transmission coefficient, diffusion coefficient, power and compressive strength without adding fly ash concrete than good, to resist chloride ion invasion have good benefits. However, instead of cement, fly ash concrete at 70% fly ash can not stop the chloride ion diffusion and transport behavior. Finally, instead of cement, fly ash concrete at 70% fly ash, the use of RCPT test can not effectively assess the chloride ion penetration.
KUMAR, VIVEK. "PREDICTION OF STRENGTH OF FLY ASH CONCRETE." Thesis, 2017. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15957.
Повний текст джерелаLin, Feng-li, and 林峰立. "The Study of Subbituminous Coal Fly Ash (Class C Fly Ash) Application in Plain concrete." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/61304872994430124989.
Повний текст джерела東南科技大學
防災科技研究所
97
This resesarcl by subbituminous (Class C Fly Ash) substitution part cement as concrete binder,march different water-to-binder ratio (W/B) with fly ash substitution quantity concrete fresh and hardened and microscopic correlation experiment discussion it’s plain concrete influence. Findings demonstration mixing class c fly ash in concrete may increase flowing property promotes the good workability compressive strength at age 91 days being higher than has not mixed uses fly ash concrete increase class c fly ash regarding concrete setting time has the phenomenon which slow congeals superficial resistance value, Chloride ion electroosmosis and crack sensitivity gauging result demonstration class c fly ash conduciving toward favor therefore class c fly ash applies in the concrete regarding concrete fresh and hardened property has good being of help but increases the ratio must discretely for it excessively many class c fly ash possibly causes the property produces the buckle phenomenon.
Len, Yun-Chen, and 林耘丞. "Properties of Concrete using Circulating Fluidized Bed Combustion Fly Ash and Coal-fired Fly Ash." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/16020627200273360796.
Повний текст джерела國立臺灣海洋大學
河海工程學系
101
The effects of coal-fired fly ash and coal-fired ground granulated blast-furnace slag as the replacement of cement on improving the strength and durability of concrete have been clarified in construction engineering. Circulating fluidized bed combustion (CFBC) is an advanced and promising combustion technology for power generation, which has been installed in Taiwan recently. After the combustion process, the coals turn into the combustion solid wastes - CFBC fly ashes, which have the potential instead of cementing materials due to their cementitious characteristics. The purpose of this study is to investigate the fresh properties, physical mechanics properties and durability of cement-based composites with CFBC fly ash and coal-fired fly ash. Tests results show for fresh mixes, specimens with CFBC fly ash and coal-fire fly ash lead to an increase of setting time and slump. For hardened concrete, specimens with CFBC fly ash and coal-fired fly ash result in a decreasing compressive strength and a volume expansion. In addition, the adding of CFBC fly ash and coal-fired fly ash can reduce the penetration of water and chloride ions and increase the sulphate attack resistance, but an increase in carbonization depth. There exists a negative relationship between compressive strength and carbonization rate. CFBC fly ashes used in this study cannot meet the requirements on physical properties and chemical compositions in ASTM C821-09 (Standard specification for lime for use with pozzolans), but suit the requirements of ASTM C593-06 (Standard specification for fly ash and other pozzolans for use with lime for soil stabilization). Based on the test results, CFBC fly ash and coal-fired fly ash can be considered as cement replacement materials and employed in concrete, however, the contents are limited and further study is needed.
Huang, Yu-Chen, and 黃玉珍. "Mechanical properties of high-volume fly ash concrete." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/18790431912068658732.
Повний текст джерела國立中興大學
土木工程學系所
104
The purpose of this study is to explore the impact of fly ash content concrete strength development and the applicability of High-Volume Fly Ash concrete, according to the result of compressive strength test based on the concrete specimens with different fly ash content (0%, 20%, 40%, 60%) and appropriate concrete mixtures. The fly ash used in this study includes the power plant product of Taiwan Power Company (Tai-power) and Formosa Plastics Company (FPC). It complies with the level of CNS 3036 Grade-F fly ash specifications. The result of compressive strength tests indicated that the amount of cement substituted by fly ash inversely proportional to the concrete compressive strength in early strength (age less than 28 days), regardless of using the product of either Tai-power or FPC. It illustrates that the more amount of fly ash substitution, the lower early strength will be resulted, which is due to the Pozzolanit reaction has not been effectively developed under the age of 28 days in fly ash concrete. On the other hand, the late strength (age more than 91 days) of fly ash concrete with different fly ash content of 20%, 40% and 60% is higher than the compressive strength of concrete without adding fly ash, regardless of using the product of either Tai-power or FPC. The effect of fly ash concrete in late strength is significant. Furthermore, the more amount of fly ash substitution, the higher late strength on the trend. It concludes that the applicability of High-Volume Fly Ash concrete is feasible. In addition to the exploration of different substitution amounts of fly ash content concrete on the development of compressive strength, this study intends to investigate the variable of major domestic sources of fly ash supplier, in order to confirm the stability and quality of fly ash. The study intends to promote the use of fly ash pozzolan materials on either public or civil construction and to enhance the effectiveness of concrete mixture. Thereby, the recycling of waste materials, environmental protection as well as the sustainability of the earth may be achieved.
Wei, Rui-Jun, and 魏睿君. "Properties of alkali-activated slag-fly ash concrete." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2d6p5e.
Повний текст джерелаZulu, Sabelo N. F. "Optimizing the usage of fly ash in concrete mixes." Thesis, 2017. http://hdl.handle.net/10321/2673.
Повний текст джерелаM
葉文德. "Shear friction strength of high-strength fly-ash concrete." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/60288242750624104997.
Повний текст джерелаWnag, Yu-He, and 王郁賀. "Study for Transport Behavior of Slag-Fly Ash Concrete." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/53001781534744354335.
Повний текст джерела國立臺灣海洋大學
材料工程研究所
103
In this study, concrete containing different slag-fly ash ratios (30%,40%,50% and 60%) of mineral admixtures with different water-to-binder ratios (0.45, 0.55 and 0.65) are made and test with the rapid chloride permeability test (RCPT), accelerated chloride ion transport test (ACMT) and Chloride migration coefficient from non-steady-state migration experiments (RCM) etc. After the test got total charge, penetration depth, steady-state migration coefficient (MS) and non- steady-state migration coefficient (MR 、Mn) to evaluate the durability and the correlation among each test. Compressive results show strength decrease with increasing W/B, but there is no rise or declining trend with increasing slag-fly ash amount of cement replacement, only with the W/B=0.45 substitution ratio 30% and 40% ,higher than the control group (group C); RCPT results show that the total charge decrease with increases W/B,that it increases with slag-fly ash amount of cement replacement less,and penetration depth,and the total content of chloride ion are also the same result. ACMT results showed that in 91 days of curing age, steady state and non-steady state migration coefficient increases due to W/B rises, and they become less with an increases with slag-fly ash amount of cement replacement less; RCM test results show that the migration coefficient with non-steady falls with slag-fly ash amount of cement replacement increasing.When the slag-fly ash amount replace 60%, non-steady-state migration coefficient is higher than 50%. The test about RCPT penetration depth and the total charge showed that, because slag-fly ash replace part of the cement, hydration reaction at 28 days of age than control group (Group C) and produce intercept difference. It may need to adjust the charge.The test also show that at the age of 91 days compared to 28 days, the hydration reaction more complete and the two groups showed a good linear relationship (R2=0.93), which does not need to adjust charge. RCM non-steady state migration coefficient and ACMT steady migration coefficient show that in the age of 28 days showed a linear relationship (R2=0.97);Both MR,MS and RCPT penetration depth show that the deeper RCPT penetration depth, the higher and MR,MS.They show a linear relationship.
huang, Yung-Kuang, and 黃永光. "Fly-Ash Concrete for Erosion Prevention to Offshore Structure." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/66425026915803553191.
Повний текст джерелаChen, Yi-Ting, and 陳怡廷. "Shear strength of high strength fly ash concrete beams." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/51644285773797386204.
Повний текст джерелаCHAUDHARY, SHASHANK. "STUDY OF PROPERTIES OF FLY ASH BASED GEOPOLYMER CONCRETE." Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16986.
Повний текст джерелаSingh, G. V. P. B. "Investigation of Activation in High Volume Fly Ash Concrete." Thesis, 2013. http://raiith.iith.ac.in/589/1/CE11M1004.pdf.
Повний текст джерела