Дисертації з теми "Blended cements"
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Kaya, Ayse Idil. "A Study On Blended Bottom Ash Cements." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612504/index.pdf.
Повний текст джерелаmer Power Plant were used to produce blended cements in 10, 20, 30 and 40% by mass as clinker replacement materials. One ordinary portland cement and eight blended cements were produced in the laboratory. Portland cement was ground 120 min to have a Blaine value of 3500±
100 cm2/g. This duration was kept constant in the production of bottom ash cements. Fly ash cements were produced by blending of laboratory produced portland cement and fly ash. Then, 2, 7, 28 and 90 day compressive strengths, normal consistencies, soundness and time of settings of cements were determined. It was found that blended fly ash and bottom ash cements gave comparable strength results at 28 day curing age for 10% and 20% replacement. Properties of blended cements were observed to meet the requirements specified by Turkish and American standards.
Stundebeck, Curtis J. "Durability of ternary blended cements in bridge applications." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/5082.
Повний текст джерелаThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on November 6, 2007) Includes bibliographical references.
Ulker, Elcin. "Comparison Of Compressive Strength Test Procedures For Blended Cements." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612506/index.pdf.
Повний текст джерелаthere is not any significant difference in between the compressive strength results of cement mortars prepared by both methods. However, for pozzolanic cements, there is much deviance in the compressive strength results of cement mortars prepared by TS EN 196-1.
Canham, Ian. "The control of alkali silica reaction using blended cements." Thesis, Aston University, 1987. http://publications.aston.ac.uk/9726/.
Повний текст джерелаUkpata, Joseph Onah. "Durability of slag-blended cements in composite chloride-sulphate environments." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20968/.
Повний текст джерелаDuru, Kevser. "Sulfate Resistance Of Blended Cements With Fly Ash And Natural Pozzolan." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607569/index.pdf.
Повний текст джерелаErdem, Tahir Kemal. "Investigation On The Pozzolanic Property Of Perlite For Use In Producing Blended Cements." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12605964/index.pdf.
Повний текст джерелаTyrer, Mark. "The Hydration chemistry of blended portland blastfurnace slag cements for radiactive waste encapsulation." Thesis, Aston University, 1991. http://publications.aston.ac.uk/14303/.
Повний текст джерелаTyrer, Mark. "The hydration chemistry of blended Portland blastfurnace slag cements for radioactive waste encapsulation." Thesis, Aston University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315145.
Повний текст джерелаOliveira, Morais de Sousa Girão Ana Violeta. "The nanostructure and degradation of C-S-H in Portland and blended cements." Thesis, University of Leeds, 2007. http://etheses.whiterose.ac.uk/712/.
Повний текст джерелаDelibas, Tughan. "Effects Of Granulated Blast Furnace Slag Trass And Limestone Fineness On The Properties Of Blended Cements." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614072/index.pdf.
Повний текст джерелаm) and coarser (+45&mu
m) than 45 &mu
m in order to determine the ingredients of -45 &mu
m, which is known to be more reactive. As a result it was shown that the grindability differences of the cement ingredients affect the properties of blended cements. An increase in the specific surface area increases both the compressive strength and heat of hydration values and adversely affects the loss on ignition values. The results also showed that if the cement particles were ground finer, it was more prone to moisture which resulted in higher loss on ignition values after longer periods.
Kurkcu, Mehmet. "Utilization Of Fly Ash From Fluidized Bed Combustion Of A Turkish Lignite In Production Of Blended Cements." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607507/index.pdf.
Повний текст джерелаSheikh, Vassiem. "Fresh properties, temperature rise and strength development of high strength concrete with binary and tertiary blended cements." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395651.
Повний текст джерелаPoussardin, Victor. "Utilisation d'argiles et de marnes calcinées dans le développement de ciments composés." Electronic Thesis or Diss., Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0040.
Повний текст джерелаThe use of Supplementary Cementitious Materials (SCMs) as a substitute for clinker is a well-known technology that can reduce the environmental cost of cement. Among the SCMs widely used today are fly ash, blast furnace slag and glass powder. In recent years, there has been a growing interest in the use of calcined clays as SCMs, particularly due to their high reactivity and availability.This thesis project focuses on the use of calcined clays and marlstones as supplementary cementitious materials. The main aim is to identify new materials that could be of interest for use as SCMs. To this end, a multi-scale macro/micro approach is used to study the calcination, pozzolanic reactivity and performance in cementitious systems of these new materials. It was possible to demonstrate that marlstones (despite their complex mineralogical composition) have the potential to be used as supplementary cementitious materials after calcination, even with a low proportion of clays. Subsequently, it was shown that palygorskite is a high potential clay for use as a supplementary cementitious material after calcination, and can be considered as a viable alternative to metakaolin. The extensive study of the use of calcined palygorskites as SCMs has also provided new fundamental insights into the understanding of the mechanisms involved in the calcination of this type of material
Saeed, Huda. "Glass powder blended cement hydration modelling." Thèse, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/1900.
Повний текст джерелаLi, Shuangxin. "Carbonation of 20-year-old blended cement pastes." Thesis, University of Leeds, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589003.
Повний текст джерелаAlp, Baris. "Utilization Of Ggbfs Blended Cement Pastes In Well Cementing." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614683/index.pdf.
Повний текст джерелаDyson, Heather Margaret. "Early hydration in binary and ternary blended cement systems." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422065.
Повний текст джерелаMeral, Cagla. "Using Perlite As A Pozzolanic Addition In Blended Cement Production." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605259/index.pdf.
Повний текст джерелаs usability in blended cement production. For this purpose, perlites from two different sources &ndash
Izmir and Erzincan - are used as replacement of portland cement clinker with two different percentages: 20% and 30% by weight of total cement. Then for each different composition, materials are ground with some gypsum in order obtain grinding curves for the resultant cements. After obtaining the grinding curves, a total of 22 cements with two different finenesses are produced by intergrinding and separately grinding the materials for each composition. The obtained cements are used in paste and mortar production so that normal consistencies, setting times, autoclave expansions, and compressive strengths are determined.
Feng, Chen [Verfasser], and Michael [Akademischer Betreuer] Fiederle. "Investigating the pore structure of blended cement with synchrotron microtomography." Freiburg : Universität, 2015. http://d-nb.info/1119805899/34.
Повний текст джерелаBrown, Ashley Vannoy. "Cement Stabilization of Aggregate Base Materials Blended with Reclaimed Asphalt Pavement." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1314.pdf.
Повний текст джерелаChanda, S. "The mechanical properties of a pulverised fuel ash blended cement paste." Thesis, University of Surrey, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370690.
Повний текст джерелаDočkal, Jakub. "Vliv technologie mletí na vlastnosti směsných cementů s pucolánovou složkou." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-239954.
Повний текст джерелаDe, Weerdt Klaartje. "Blended cement with reduced CO2 emission- utilizing the fly ash-limestone synergy." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for konstruksjonsteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12038.
Повний текст джерелаGergab, Faisel Ahmed. "The use of corrosion inhibitors for the protection of steel in blended cement concrete." Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/842852/.
Повний текст джерелаJia, Shanshan. "Micro/nano-structural evolution in blended cement paste due to progressive deionised water leaching." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7429/.
Повний текст джерелаMatyk, Tomáš. "Studium vlastností betonů s „green cementy“." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226718.
Повний текст джерелаJensen, Hans-Ulrich. "The effect of sea-water on the hydration of Portland cement and fly ash cement blends." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47124.
Повний текст джерелаStachová, Jana. "Snižování emisí CO2 při výpalu hydraulických pojiv." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390263.
Повний текст джерелаSirtoli, Davide (ORCID:0000-0003-2717-9509). "Mechanical performance of sulfo-based rapid hardening concrete systems focusing on blends with Portland cement." Doctoral thesis, Università degli studi di Bergamo, 2018. http://hdl.handle.net/10446/104982.
Повний текст джерелаMartykán, Jiří. "Sledování vývoje AFt fází ve směsných portlandských cementech s fluidním popílkem." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240190.
Повний текст джерелаDobrovolný, Petr. "Možnosti využití skelného recyklátu pro přípravu směsných cementů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227741.
Повний текст джерелаSnelson, David Geoffrey. "Hydration, pore development and chemical resistance of Metakaolin-fly ash-Portland cement (MK-PFA-PC) blends." Thesis, University of South Wales, 2005. https://pure.southwales.ac.uk/en/studentthesis/hydration-pore-development-and-chemical-resistance-of-metakaolin--fly-ash--portland-cement-mkpfapc-blends(4d662a75-989d-4bb5-9c67-fe6c4c752de4).html.
Повний текст джерелаUzal, Burak. "Properties And Hydration Of Cementitious Systems Containing Low, Moderate And High Amounts Of Natural Zeolites." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608974/index.pdf.
Повний текст джерелаfaster setting than portland cement, low amounts of Ca(OH)2 and capillary pores larger than 50 nm in hardened pastes, relatively dense microstructure of hardened paste than portland cement, more compatibility with melamine-based superplasticizer than being with naphthalene-based one, and excellent compressive strength performance. Concrete mixtures containing natural zeolites as partial replacement for portland cement were characterized with the following properties
7-day compressive strength of ~25 MPa and 28-day strength of 45-50 MPa with only 180 kg/m3 portland cement and 220 kg/m3 zeolite dosages (55% replacement), comparable modulus of elasticity with plain portland cement concrete, &ldquo
low&rdquo
and &ldquo
very low&rdquo
chloride-ion penetrability for low and large levels of replacement, respectively.
Trauchessec, Romain. "Mélanges de ciments sulfoalumineux et Portland." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0234/document.
Повний текст джерелаBlends of ordinary Portland cement and sulfoaluminate cement are innovative hydraulic binders allowing control of concrete properties such as hardening speed or dimensional stability for specific applications. Moreover, carbon dioxide emissions linked to sulfoaluminate cement are significantly reduced compared to ordinary Portland cement. The binder properties can be adjusted due to the diversity of blends conceivable with these two constituents. Each blend has its own hydration kinetic and properties. For example, some blends are expansive and the hardening is progressive whereas other mixtures are dimensionally stable but their strength stagnates after few days. Identification and control of the parameters responsible of these comportments are necessary in order to guaranty specific properties for each application: screed, repairing mortar, etc. This is the aim of this study which described the hydration kinetic, the properties and composition of three blends containing 85 %, 70 % and 40 % of Portland cement. These experiments are completed by thermodynamic modeling of the hydration mechanisms. The effect of the Portland cement composition has also been tested. Finally, it's shown that anhydrite and calcium hydroxide are two key parameters which modify radically the hydration process and allow the properties adjustment required for the blend used
Deschner, Florian [Verfasser], Jürgen [Akademischer Betreuer] Neubauer, Christian [Akademischer Betreuer] Kaps, and Frank [Akademischer Betreuer] Winnefeld. "Reaction of siliceous fly ash in blended Portland cement pastes and its effect on the chemistry of hydrate phases and pore solution / Florian Deschner. Gutachter: Jürgen Neubauer ; Christian Kaps ; Frank Winnefeld." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2014. http://d-nb.info/1054731675/34.
Повний текст джерелаStephant, Sylvain. "Etude de l'influence de l'hydratation des laitiers sur les propriétés de transfert gazeux dans les matériaux cimentaires." Thesis, Dijon, 2015. http://www.theses.fr/2015DIJOS090/document.
Повний текст джерелаCements with high slag content are currently studied as possible candidate for nuclear waste containment materials. In this context it is important to know their microstructure and the transport properties (permeability and diffusion) of the gases that are formed by the radiolysis of the water present in this material. According to literature, these properties are strongly impacted by the addition of blast furnace slag. The aim of this work is to correlate the hydration processes of slag blended cements with their transport properties. In the first part of this work, the hydration of the slag blended cements, for which only few results have been reported to date, has been studied. Silicon-29 and aluminium-27 Magic-Angle Spinning Nuclear Magnetic Resonance (MAS NMR) were used to follow the variations of anhydrous phases of clinker (C3S, C2S, C3A and C4AF) and of the main oxides of the slag (SiO2, Al2O3, CaO, MgO and SO3). The quantity of calcium dissolved from slag was deduced by fitting the quantity of portlandite [Ca(OH)2] calculated by a geochemical software (PHREEQC - coupled to a thermodynamic database) with TGA measurements. Our approach enabled the evolution of the hydration degree (percentage of reacted material) of various oxides of slag to be determined. A progressive and an incongruent dissolution (the rate of dissolution of the oxides is different) of the slag is observed. The low reactivity of slag could be linked, at a hydration time, to a lower content of bound water, chemical shrinkage and heat of hydration. Quantitatively accounting for the dissolution of clinker and oxide of slag yields a more accurate description of the hydration process. The second part of this work is focused on the microstructure evolution and its influence on the transport properties (diffusion and permeability). Time-evolution of the diffusion coefficients and the intrinsic permeability could be monitored and were then compared to that of the microstructure (global porosity, pore entry size distribution, specific surface area and the degree of connectivity). The results showed a decrease in the diffusion coefficient and permeability over time which is due to the progressive filling of the porosity. A decrease of these parameters with the slag content increasing was also observed. This is a consequence of the diminution of the capillary porosity and augmentation of the nanoporosity resulting from changes in the microstructure of C-S-H. The last part concerns the relation between the hydration processes, the microstructure and the transport properties. To this aim, volumetric balances of reactions involved in the hydration processes were made by considering globally or specifically the hydration of the different phases. Accounting for the hydration of each phase of the cement allowed us to determine the global porosity, the bound water content and the chemical shrinkage with accuracy of the order of 10 %. This description allows the understanding of the transport properties variations in time for a same material To establish this time evolutions for all the cements, the apparent volume of C-S-H was recalculated to account for the microstructure of these hydrates
Іващишин, Ганна Степанівна. "Низькоемісійні змішані цементи та модифіковані бетони і будівельні розчини на їх основі". Diss., Національний університет "Львівська політехніка", 2020. https://ena.lpnu.ua/handle/ntb/53805.
Повний текст джерелаZaťko, Petr. "Vliv rozptýlené výztuže na průběh zrání polymercementových hmot." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265336.
Повний текст джерелаPerlot, Céline. "Influence de la décalcification de matériaux cimentaires sur les propriétés de transfert : application au stockage profond de déchets radioactifs." Toulouse 3, 2005. http://www.theses.fr/2005TOU30211.
Повний текст джерелаCementitious materials have been selected to compose engineering barrier system (EBS) of the french radioactive waste deep repository, because of concrete physico-chemical properties: the hydrates of the cementitious matrix and the pH of the pore solution contribute to radionuclides retention; furthermore the compactness of these materials limits elements transport. The confinement capacity of the system has to be assessed while a period at least equivalent to waste activity (up to 100. 000 years). His durability was sustained by the evolution of transfer properties in accordance with cementitious materials decalcification, alteration that expresses structure long-term behavior. Then, two degradation modes were carried out, taking into account the different physical and chemical interactions imposed by the host formation. The first mode, a static one, was an accelerated decalcification using nitrate ammonium solution. It replicates EBS alteration dues to underground water. Degradation kinetic was estimated by the amount of calcium leached and the measurement of the calcium hydroxide dissolution front. To evaluate the decalcification impact, samples were characterized before and after degradation in term of microstructure (porosity, pores size distribution) and of transfer properties (diffusivity, gas and water permeability). The influence of cement nature (ordinary Portland cement, blended cement) and aggregates type (lime or siliceous) was observed: experiments were repeated on different mortars mixes. On this occasion, an essential reflection on this test metrology was led. The second mode, a dynamical degradation, was performed with an environmental permeameter. It recreates the EBS solicitations ensured during the resaturation period, distinguished by the hydraulic pressure imposed by the geologic layer and the waste exothermicity. This apparatus, based on triaxial cell functioning, allows to applied on samples pressure drop between 2 and 10 MPa and temperature from 20 to 80°C. Water permeability evolution relating to experimental parameters, uncoupled or coupled, was relied to mortars microstructural modifications
"INVESTIGATION ON THE POZZOLANIC PROPERTY OF PERLITE FOR USE IN PRODUCING BLENDED CEMENTS." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12605964/index.pdf.
Повний текст джерелаChang, Chengcheng, and 張正成. "Engineering Properties of LED Sludge-blended Cement Mortar." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/34307870586889133079.
Повний текст джерела國立聯合大學
土木與防災工程學系碩士班
100
The Taiwan government promote the energy saving and carbon reduction policy in recent years, they were encouraged to product Light Emitting Diode (LED) for energy saving. Therefore, the LED sludge a by-product in the LED manufacturing process sludge was been produced largely and may compromise the environment. Since the LED sludge is rich in nano-particles SiO2, Al2O3 and SiC, these hazardous ingredients are harmful to the ecological environment and endanger human health if improper disposal. The purpose of this study is to explore the possibility of using LED sludge and LED-MSWI slag to replace partial cement to mold cement-mortar specimens for test, hence, the research study contained two parts as follow: 1. The LED manufacturing process sludge were calcined and the properties of LED sludge sample were investigated by scanning electron microscope/energy dispersive x-ray spectrometry (SEM/EDS) analysis, x-ray diffraction (XRD) analysis, and Pozzolanic activity index test, the test results were used as a guides for the selections of the particle ize of sludge and replacement ratio for producing compound of sludge-blended cement mortar (SBCM), and then for the compressive strength test, mass growth measurement and MIP test. The compressive strengths of SBCM will be compared with those of OPCM (ordinary Portland cement mortar, control group). 2. The mix of LED sludge with municipal solid waste incinerator (MSWI) ash-mix with 0.5: 1.0 weight ratio were also proposed to be melted and form a glassy slag (called LED-MSWI slag). This slag were conducted for XRD analysis, TCLP test, pozzolanic activity index test, and SEM/EDS analysis, then the LED-MSWI slag is used to replace 5-20 percent of cement by weight in cement mortar specimens (5×5×5-cm3) for compressive strength test, mass growth measurement, XRD analysis, and SEM/EDS analysis. The first part test results revealed that the LED sludge can be replaced partial cement and use in cement mortars,their compressive strength were comparable to the OPCM, because of the nano-particles effect and pozzolanic reaction. The other properties were similar to OPCM. The second part test results exhibit the LED-MSWI slag-blended cement mortar (SBCM) compressive strength substantially greater than OPCM, which was due to nano-particles effect and pozzolanic reaction. The other engineering properties were also similar to OPCM specimens. The goal of this study is to recycle the harmful materials such as LED sludge and MSWI ash-mix into a useful resource to eliminate its disposal problems and appeal to the sustainable development of earth.
Tzeng, Bor-Yu, and 曾博榆. "Hydration Characteristics of MSWI Ashes Modified Slag Blended Cement." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/84616308271529480885.
Повний текст джерела國立中央大學
環境工程研究所
90
This study investigated the pozzolonic reactions and engineering properties of municipal solid waste incinerator (MSWI) ash modified slag blended cements (SBC) with various replacement ratios. The modified slags were characterized by melting the MSWI ash mixtures at 1,400℃ for 30 min. The mixtures were composed of different types of MSWI ash, including fly ash, scrubber ash and bottom ash, with various formulas. Bottom ash and scrubber ash, in general, have higher melting points, and are more energy intensive to melt than fly ash. Therefore, fly ash was used to modify the mixtures. The obtained slags were divided into three series based on the experimental ash mixtures. Following further pulverization, these slags were blended with cement at cement replacement ratios ranging from 10% to 40%. The slags thus obtained were quantified and the characteristics of their SBC pastes examined, including the pozzolanic activity, compressive strength, hydration activity, gel pores, crystal phases, species, and the microstructure at various ages. The results indicate that the slag contained 27∼34% CaO, 29∼39% SiO2, and 8∼23% Al2O3, and approximately 47∼67% non-calcium compounds, thus meeting the ASTM C grade for fly ash, which is similar to that of the blast furnace slag. The 90-day compressive strength developed by SBC pastes with a 10% and 20% cement replacement by slags generated from the modification of scrubber ash, outperformed that of ordinary Portland cement(OPC) by 1-7 MPa, whereas the slags generated from the modifications of bottom ash series were comparable to OPC with a difference of less than 0.5MPa. From the pore size distribution, as shown by the MIP results, it was found that, with increasing curing ages, the gel pores increased and the total porosity and capillary pores decreased ─ a result that shows that hydrates had filled the pores. XRD and DTA species analyses indicated that the hydrates in SBC pastes were mainly CH, the calcium silicate hydrate C-S-H(C-S-H) gel, and C-A-H salts, like those found in OPC paste. TG analysis also indicated that the slag reacted with CH to form C-S-H and C-A-H. The average length (in terms of the number of Si molecules) of linear polysilicate anions in C-S-H gel, as determined by NMR, indicated an increase in all SBC pastes with increasing curing age, which outperformed that of OPC at 90 days. The generation of C-S-H gel, with intersections forming a network structure, as observed by SEM from the surface reaction with CH, also indicated the later development of strength in SBC pastes enhanced by the slag. It can be concluded from the study results that MSWI ash can be modified and processed by melting to recover reactive pozzolanic slag, which may be used in SBC to partially replace cement.
Tu, Geng-Ye, and 塗耕業. "Hydration Characteristic of Cement Paste Blended with Pozzolanic Materials." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/34248824734755988221.
Повний текст джерела國立中興大學
土木工程學系所
95
The purpose of this research is to investigate the effects of adding pozzolanic materials on the hydration characteristics of the cement paste. First, for the conditions of varied experimental parameters including water-to-binder ratios(w/b), pozzolanic material replacements and testing ages, the compressive strength tests, the ignited loss analysis, and the MIP porosity measurements were conducted on three series of pastes— ordinary Portland cement (OPC) paste, fly ash-cement (FC) paste and slag-cement (SC) Paste. Second, the effects of experimental variables on compressive strength, non-evaporable water (wn) content, Ca(OH)2 content, degree of pozzolanic reaction and porosity of the three series of pastes were studied. The interaction existing in these variables was also assessed. Finally, the correlations between the results of each test would be analyzed and canvassed. The correlation formula would be further established according to the obtained experiment data. Test results show that, for all series of pastes, with w/b increasing, wn content, Ca(OH)2 content, degree of pozzolanic reaction, degree of cement reaction, and porosity would increase. However, the compressive strength and the gel/space ratio of the pastes would decrease; For pozzolan-cement pastes, the wn content would decrease with the increase of the percentage of cement replaced by pozzolanic material; For OPC pastes, with the increase of age and w/b, the Ca(OH)2 content would increase, but after 28 days, the raising tendency has gradually slowed down. Nevertheless, the Ca(OH)2 content of FC and SC pastes would decrease with the age and the proportion of replacement increasing; The reaction degree of pozzolanic material is in connection with age and w/b. For the same w/b, the reaction degree of slag (14.7~40.3%) is higher than that of fly ash (3.1~28.3%); The porosity of paste would increase with the increase of pozzolanic material replacement. For lower w/b and replacement level, pozzolanic materials would have the better capability of filling pores; The gel/space ratio would decrease with the increase of the replacement of pozzolanic material. For both FC pastes and SC pastes, at the highest replacement level, the reduced extent of gel/space ratio would be significantly higher than that at the other replacement levels; As for the correlations between total pore volume and either compressive strength or gel/space ratio, OPC pastes possess the optimum correlation coefficients (R2 = 0.9242 & 0.8845).
Yu-Hsien, Lin, and 林育賢. "Engineering Properties of White Carbon Sludge-blended Cement Mortar." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/c8qp57.
Повний текст джерела國立聯合大學
土木與防災工程學系碩士班
101
The purpose of this study is to explore the possibility of using White Carbon Sludge (WCS) sludge, a by-product from the manufacturing rubber of chemical industry, to replace partial cement in cement-paste, cement-mortar. The emphases are on its material strength and engineering properties. WCS sludge is rich in hazardous nano-particles of SiO2 and other debris of unknown organics. These hazardous ingredients may harmful to the ecological environment, and the WCS sludge may be a pozzlanic material suitable recycling in cement concrete, which worth to investigate. WCS sludge were firstly conducted for XRD analysis and SEM/EDS analysis, the test result demonstrate that the WCS sludge were pozzolanic material, then we adopted the water/cementitious ratio of 0.485 and 0.55, and used 2.5, 5.0, 10.0, and 15.0 % cement replacement to mold the WCS sludge-blended cement mortar (SBCM; experiment group) specimen and ordinary Portland cement mortar (OPCM; control group) specimen are also to be made for comparisons, which are compressive strength test, and mass growth measurement. That test results reveal that the compressive strength of SBCM specimens were comparable to the OPCM specimens by the water/cementitious ratio of 0.485. The compressive strength of SBCM specimens were higher than OPCM specimens about 10~42% by the W/C ratio of 0.55, but their flow values were quickly decrese with the cement replacement ratio increase. For the purpose of practical engineering, which need the good workability . So the experiment try to add the Type G superplastisizer, and we use the Taguchi Method of L9(34). The cement, white carbon sludge, superplasticsizer, and W/C ratios were selected for the control factor, the compressive strength test of 9 samples of SBCM and OPCM specimen were be conducted. The test results reveal that the strength of samples A3B3C2D1 were 154% of OPCM specimens. The reconfirmation test also reveals the good results. Those tests results reveals that the feasibility of reuse WCS sludge in practical engineering. The goal of this study is to transform the waste materials of WCS sludge into a useful resource to eliminate its disposal problems and appeal to the sustainable development of earth.
"Using Perlite As A Pozzolanic Addition In Blended Cement Production." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605259/index.pdf.
Повний текст джерелаChen, Chung-Yuan, and 陳忠元. "Effect of Superplasticizers on the Early Behaivor of Blended Cement." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/08197174833563137839.
Повний текст джерела國立中央大學
土木工程學系
86
Superplasticizer(SP)and pozolans, fly ash and slag, are commonlyused in making high performance concrete (HPC) to achieve high flowability and high strength. The flowability and early behavior of freshHPC are highly dependent on the interaction of SP with cement and pozzolans. This research is to investigate the effects of SPs on the earlybehavior of cement paste containing pozzolans. Three SPs including SNF,SMF and PCA were used to study the compatibility with cement, fly ash,and slag. The spread area of minislump test, flow time of Marsh cone,viscosity, adsorption of SP on cement and pozzolan particles, the ion concentration in the solution phase, X-ray diffraction analysis, and SEMobservation were measured in this research.Test results indicate that the saturated concentration of SNF was lower than SMF. The equilibrium time of SNF adsorption on cementparticles was faster than SMF. The slump loss that the SNF added pastewas higher than the paste containing SMF. The adsorption of SNF was amonolayer adsorption. SMF had a maximum amount of adsorption when the concentration was increased to a certain level. The water reducingmechanism of PCA, a polycarboxylic acid based SP, was different from SNF and SMF. A critical dosage of PCA was needed to attain suitable pasteflowability. The use of PCA with fly ash resulted in higher viscosity andhysteresis, the paste became sticky and less flowability. A calcium richhigher SP adsorption. At the same dosage of SP, the flowability was decreased with increasing the amount of fly ash in the paste. The amount ofSP adsorption on slag particle was less than on fly ash. The flowability of the paste containing slag was better than the fly ash added paste.
Koong, Jan Min, and 孔建民. "Hydration Mechanism of Dry Blended Fly Ash Cement With Steam." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/25725656626607205694.
Повний текст джерела國立交通大學
土木工程研究所
82
In 1991 the National Science Council of Republic of China funded a research program, entitled"Hydration Mechanisms and Physical Properties of Cementitious Materials Hardened through The Dry-mix/Steam-Injection Process". The test results indicate that the transfer of heat energy from steam to cement particles at the moment of contact triggers a repid hydration reaction when the activation energy reaches the energy barrier. Concrete thus made developed high strength in relatively short period of time, about one day. It was envisioned that the Pozzolanic materials such as fly ash may have similar behavior as that of the portland cement under the effect of steam. Fly Ash, a by- product of power plants, requires an adequate study for reuses. It generally reacts slowly in Wet process, may however, react rapidly in a pressurized steam condition. The objective of the program is to verify the concept of hydrating the dry fly ash cement by steam. The test results reveal that fly ash concrete made through the dry-mix/steam injection process substantially shortens the hydration time and increases the concrete strength as well. For example, it developed 641 kgf/cm2 strength with a 40% fly ash substitution under a 13.5 hour exposure to 200℃ steam. This report suggests ways to optimize the diffusion mechanisom during the steaming period. The hardened paste of steamed fly ash concrete was examined by the ignition loss process. The result shows that the decomposition phenomenon is quite clear in the temperature range of 105 to 440℃.
Chen, Kuan-Wei, and 陳冠薇. "Carbonation of Steel-making Slag for CO2 Fixation and Utilization in Blended Cement." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/36475952635977735426.
Повний текст джерела國立臺灣大學
環境工程學研究所
103
This study explores the feasibility of developing sustainable construction materials via mineral carbonation of steelmaking slag, i.e., basic oxygen furnace slag (BOFS). The carbon fixation capacity of BOFS was quantified by thermo-gravimetric analysis. Various engineering properties and hydration characteristics of blended cement with 10 % of both fresh BOFS and carbonated BOFS by weight as cement replacement was investigated. The results indicate mineral carbonations accompanied by significant reduction in basicity and fixing 0.202 and 0.221 kg CO2/kg BOFS at 30 oC and 60 oC within the rotating packed bed (RPB) reactor. The reaction kinetics of carbonation experiments could be well expressed by the surface coverage model, with R2 values ranged from 0.97 to 0.98. Cement blended with 10 wt% of carbonated BOFS resulted in reduced setting times and accelerated early strength development, which was consistent with the results of hydration heat and XRD observations. The SEM observations suggest that the carbonated BOFS could serve as nuclei for the precipitation of hydration products, while also accelerating the hydration. In addition, blended cement with 10 % of carbonated BOFS improved sulfate resistance ability and drying shrinkage property compared to 10 % of fresh BOFS at ambient temperature (23oC). The mineralogical composition changes after carbonation have beneficial effects on the hydraulic property in concrete. It was thus concluded that the carbonation of steelmaking slag should be considered as a feasible and attractive process for carbon fixation and waste valorization
He, Ching-Wei, and 何青薇. "Durability and long-term leachability of cement mortar blended with incinerator bottom ash." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/40603972771423835111.
Повний текст джерела國立高雄應用科技大學
土木工程與防災科技研究所
99
In Taiwan the recovery of incineration bottom ash has usually been used as the construction material. However, the issues of durability and long-term stability are continually worth of research to study on the addition of incineration bottom ash regarding engineering construction products. Thus, this study investigated for the observing the failure behavior of cement mortar under sulfate attack by using the sodium sulfate immersion test and incineration bottom ash on the understanding of heavy-metal leaching characteristic and long-term environmental friendliness by using the Multi-TCLP test. The result of sodium sulfate immersion test showed that the addition of incineration bottom ash below 15% has the ability of corrosion resistance. Moreover, the result of Multi-TCLP test indicated that all metals have no dissolution in the multi-extraction tests but low concentrations of copper and zinc initially. Although incineration bottom ash has the long-term environmental friendliness, the addition of incineration bottom ash used as an aggreagate in the cement motar should be restriction against the risk of corrosion attack.