Дисертації з теми "Pozzolanas"
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Olekambainei, Arip-Kituyan Emmanuel. "The influence of moulding moisture content on the engineering properties of aggregate-lime-natural pozzolan mixes." Diss., Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-06092005-094814.
Повний текст джерелаHansen, Débora Magali. "Avaliação das propriedades pozolânicas de um resíduo de cerâmica vermelha para emprego como material cimentício suplementar." Universidade do Vale do Rio dos Sinos, 2016. http://www.repositorio.jesuita.org.br/handle/UNISINOS/5397.
Повний текст джерелаMade available in DSpace on 2016-06-15T15:50:42Z (GMT). No. of bitstreams: 1 DÉBORA MAGALI HANSEN_.pdf: 2330600 bytes, checksum: 74a7605994355dc5762f8c364bddf4c9 (MD5) Previous issue date: 2016-03-30
CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
PROSUP - Programa de Suporte à Pós-Gradução de Instituições de Ensino Particulares
A destinação final ambientalmente adequada para os resíduos sólidos industriais é uma problemática que veio ganhando maior importância ao longo dos anos. O setor da construção civil consome grandes quantidades de insumos, gerando paralelamente grandes quantidades de resíduos. Quando o assunto é reciclagem de resíduos industriais, o setor da construção civil exerce um papel importante, reciclando resíduos de diversos setores da economia. Tendo em vista a existência do polo cerâmico no Rio Grande do Sul, e totalidade de resíduos de cerâmica vermelha (RCV) resultante desse polo, buscou-se através deste estudo, verificar qual é o percentual de geração de RCV em uma empresa específica, devido a grande variabilidade dos dados apresentados pela literatura. E em paralelo buscou-se avaliar o potencial pozolânico do RCV e comparar o seu desempenho com o metacaulim, material já consagrado como pozolana. Os aglomerantes (cimento CP II-F-32, Ca(OH)2 – P.A., CH-I) e os materiais pozolânicos (RCV e metacaulim) empregados na pesquisa foram caracterizados quimicamente por ensaios de fluorescência de raios X (FRX) e Perda ao Fogo (PF), mineralogicamente por ensaios de difração de raios X (DRX) e fisicamente por ensaios de, granulometria a laser, massa específica e área superficial específica (BET). Além disso, o RCV e o metacaulim foram submetidos a ensaios para determinação do teor de umidade e finura. Para avaliar a atividade pozolânica do RCV e comparar seu desempenho ao metacaulim foram realizados ensaios de condutividade elétrica, termogravimetria e ensaios de resistência à compressão, orientados pelas NBR 5752:2014, NBR 5751:2015 e NBR 15894:2010. Mediante os resultados obtidos, verificou-se que o percentual de geração de RCV na empresa objeto de estudo, com os ensaios de caracterização foi possível verificar que o RCV atende aos requisitos químicos estabelecidos pela NBR 12653:2014. O procedimento de moagem conferiu ao RCV uma granulometria adequada para uso como pozolona. Quanto a atividade pozolânica, verificou-se que o RCV atendeu ao requisito da NBR 12653:2014, no que diz respeito à resistência com o aglomerante Ca(OH)2 P.A., já quando ensaiado com o aglomerante CH-I, o RCV apresentou resistência à compressão consideravelmente superior ao metacaulim. Já nas argamassas moldadas com cimento, o RCV não atingiu o índice de atividade pozolânica (IAP) exigido na NBR 12653:2014, impedindo sua classificação como material pozolânico. Nas argamassas ensaiadas sob as prescrições da NBR 15894:2010, contendo 15% de substituição do cimento pelo RCV, os resultados de resistência à compressão não apresentaram diferenças significativas em relação às argamassas referência, apontando indícios de melhor desempenho em menores teores de substituição. As análises térmicas evidenciaram o consumo de Ca(OH)2 das pastas. As pastas formuladas com 25% de substituição do cimento por metacaulim apresentaram maior consumo de Ca(OH)2 em relação as pastas formuladas com 25% de RCV, evidenciando a atividade pozolânica dos materiais.
The final destination environmentally suitable for industrial solid waste is a problem that came gaining more importance over the years. The construction industry consumes large amounts of supplies, generating parallel large quantities of waste. When it comes to recycling of industrial waste, the construction sector plays an important role, recycling waste from various sectors of the economy. Considering the existence of the ceramic polo at the Rio Grande do Sul, and all red ceramic waste (RCV) resulting from this pole, we sought through this study, find what is the percentage of RCV generation in a specific company due the great variability of the data presented in the literature. And in parallel we sought to evaluate the potential of pozzolan RCV and compare their performance with metakaolin, material already recognized as pozzolan. The binder (cement CP II-F-32, Ca(OH)2 – P.A., CH-I) and pozzolanic materials (RCV and metakaolin) employed in the study were chemically characterized by X-ray fluorescence assays (XRF) and Loss Fire (PF), mineralogically by testing X-ray diffraction (XRD) and physically by tests of laser granulometry, specific gravity and specific surface area (BET). Furthermore, the RCV and metakaolin were subjected to tests for determination of humidity content and fineness. To evaluate the pozzolanic activity of the RCV and compare its performance to metakaolin were performed electrical conductivity tests, thermogravimetry and compressive strength tests, guided by the NBR 5752:2014, NBR 5751:2015 and NBR 15894:2010. From the results obtained, found to the percentage of RCV generation in study subject company with the characterization tests it was verified that the RCV meets chemical requirements of the NBR 12653:2014. The grinding procedure gave the RCV adequate particle size for use as pozolona. As the pozzolanic activity, it was found that the RCV met requirement the NBR 12653:2014 with regard to resistance to Ca(OH)2 P.A. agglomerating, since when tested with CH-I agglomerating, the RCV showed compression resistance the considerably higher than metakaolin. Already in the cast with cement mortar, the RCV has not reached the pozzolanic activity index (IAP) required in NBR 12653:2014 preventing classification as pozzolanic material. In mortars tested under the requirements of NBR 15894:2010, containing 15% replacement of cement by RCV, the compressive strength results showed no significant differences from the reference mortar, indicating better performance indications in lower replacement levels. The thermal analysis showed the consumption of Ca(OH)2 pastes. The pastes formulated with 25% of the cement replaced by metakaolin showed increased consumption of Ca(OH)2 relative pastes formulated with 25% RCV, showing the pozzolanic activity of the materials.
Uzal, 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.
Tashima, Mauro Mitsuuchi [UNESP]. "Cinza de casca de arroz altamente reativa: método de produção, caracterização físico-química e comportamento em matrizes de cimento Portland." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/91490.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Universidade Politecnica de Valencia- Espanha
O presente trabalho apresenta um método de produção de cinza de casca de arroz (CCA) altamente reativa e de coloração clara, bem como o seu comportamento em matrizes de cimento Portland com o intuito de avaliar a atividade pozolânica da CCA. O trabalho está dividido em quatro etapas, a saber: construção de um forno e produção da cinza de casca de arroz, caracterização físico-química da CCA, verificação da atividade pozolânica do material através de métodos instrumentais e, finalmente, ensaios mecânicos em argamassas de cimento Portland. O forno utilizado para a produção da cinza de casca de arroz não apresenta controle de temperatura e, o tempo de queima é bastante longo, aproximadamente 36 horas. Neste método obtém-se cerca de 1,5Kg de cinza por processo de queima. A cinza obtida apresenta uma coloração clara e o seu caráter amorfo foi determinado através de diferentes métodos: difração de Raio-X, determinação do teor de sílica amorfa, análise termogravimétrica, Microscopia Eletrônica de Varredura (MEV) e ensaios mecânicos em argamassas de cimento Portland. O programa experimental também abrange estudos de variação da finura da CCA e estudos com diferentes porcentagens, em substituição ao cimento Portland. Os resultados obtidos foram comparados...
This research show a method of production white amorphous Rice Husk Ash (RHA), therefore, the behaviour of RHA in Portland cement matrix to evaluate the pozzolanic activity of this material. The research can be shared in four steps, to know: construction of an oven and production of rice husk ash, physical-chemical analysis of the rice husk ash, evaluation of pozzolanic activity of the pozzolan though instrumental analysis and, finally, mechanical properties of Portland cement mortars. The oven used for production of rice husk ash didn't have a control of temperature and, the time of burning is so longer, approximately 36 hours. In this method is obtained for about 1,5Kg of ash. The obtained ash has white colour and its amorphous phase were determined though different methods: X-ray diffractometry, determination of amorphous silica, Termogravimetric Analysis (TA), scanning electron microscopy (SEM) and mechanical properties of Portland cement mortars. Besides that, the experimental procedure involves studies on fineness variation of rice husk ash and different degrees of Portland cement substitution. The obtained results were compared with silica fume, because this is the most similar pozzolanic material with rice husk ash. The RHA produced under this method can be used... (Complete abstract click electronic access below)
Acar, Ilker. "Characterization And Utilization Potential Of Class F Fly Ashes." Phd thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615688/index.pdf.
Повний текст джерелаatalagzi and Sugö
zü
thermal power plants were carried out and their utilization potentials in three different fields were examined. Characterization of sintered samples and determination of their utilization potentials in ceramic industry is the first research area in this thesis. For this purpose, the class F fly ash samples were first pressed into cylindrical specimen without the addition of any organic binders or inorganic additives, and then sintered to form ceramic materials. Effects of sintering temperature and time on sintering characteristics were investigated. In the experiments, the cylindrical specimens were first preheated to 300oC for 1 h to remove moisture and any other gases. The specimens were then fired at the temperatures of 1000oC, 1050oC, 1100oC and 1150oC for the sintering times of 0.5, 1.0, 1.5 and 2.0 hours. Heating rate of 10oC/min was kept constant throughout the experiments. Quality of sintered samples was evaluated in terms of ceramic specifications such as density, water absorption, porosity, shrinkage and splitting tensile strength. In addition, mineralogical and microstructural changes during sintering were determined with X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses. According to literature data, better microstructure, the highest density and strength with the lowest porosity, water absorption and shrinkage values are the indications of the optimum sintering conditions. Based on these specifications, Sugö
zü
fly ash gave better results compared to Ç
atalagzi fly ash, and the optimum conditions were achieved at the sintering temperature of 1150oC for the sintering time of 1.5 hours for both samples. Pozzolanic reactivity of the fly ashes and their utilization potentials in civil engineering applications were also examined in detail during this study. For this purpose, Ç
atalagzi (CFA) and Sugö
zü
(SFA) fly ashes were first subjected to a specific hydraulic classification process developed at CAER (University of Kentucky, Center for Applied Energy Research) to recover ultrafine fly ash particles. The overflow products with average particle sizes of 5.2 &mu
m for CFA and 4.4 &mu
m for SFA were separated from the respective as-received samples with average particle sizes of 39 &mu
m and 21 &mu
m. After the classification stage, the pozzolanic activities of these ultrafine fly ash fractions (UFA) and as-received samples were examined by preparing a number of mortar (mixture of Portland cement (PC), FA or UFA as partial cement replacement, sand and water) and paste (mixture of PC, FA or UFA as partial cement replacement and water) specimens. Control samples containing only PC were also prepared and tested through the experiments for the comparison of the results. In the mortar experiments, three different PC replacement ratios by FA and UFA (10%, 20% and 30%) were used to examine the effects of FA and UFA samples on the fresh and hardened mortar properties such as water requirement, compressive strength, drying shrinkage and water expansion. These mortar tests indicated that ultrafine fractions of Ç
atalagzi (CUFA) and Sugö
zü
(SUFA) fly ashes provided more than 10% reduction in water demand compared to the control sample for 30% PC replacement. The mortar cubes containing CUFA and SUFA samples exhibited also higher strength development rates after 14 days compared to the ones with as-received samples and PC only. At the end of the curing age of 112 days, both CUFA and SUFA provided more than 40% increase in compressive strength compared to the control sample for the PC replacement ratios higher than 20%. As a comparison, SUFA gave better results than CUFA in both water demand and compressive strength tests. The mortar bars prepared with the both FA and UFA samples exhibited very low shrinkage and expansion values. These values decreased generally with increasing PC replacement ratio especially after 14 days. In the paste experiments, thermogravimetric analyses (TGA) of the paste specimens prepared by using only with 20% PC replacement were carried out to determine pozzolanic reactivity of the samples. The difference between the remaining Ca(OH)2 (portlandite) contents in the paste specimens containing the fly ashes and the reference PC paste was used as a measure of pozzolanic reactivity. After 112 days, 68.56% and 62.68% Ca(OH)2 content of PC only pastes were obtained with the pastes containing CUFA and SUFA samples, respectively, corresponding to 11% and 13% more Ca(OH)2 consumptions in reference to the respective as-received samples. X-ray diffraction (XRD) analyses were also performed for comparison of main portlandite peak intensities in the paste specimens containing FA or UFA with those in the PC only paste during cement hydration. According to these XRD analyses, portlandite content in PC/UFA pastes decreased significantly after 14 days compared to the PC only paste. All of these tests and analyses showed that a highly reactive lower cost pozzolan with very fine particle size and higher surface area compared to regular fly ash pozzolans can be produced from both Ç
atalagzi and Sugö
zü
fly ashes using a relatively simple hydraulic classification technology. Cenosphere recovery potentials from Ç
atalagzi and Sugö
zü
fly ashes were also studied in this thesis. Determination of cenosphere content was done under optical microscope by particle counting on the basis of point and area. Based on the point-counting data, CFA and SFA samples originally contain 11.30% and 4.50% cenospheres, respectively. Variations of cenosphere contents in the fly ash samples were examined by using float-sink, screening and air classification tests. The results pointed out that cenosphere contents decreased with decreasing size and increasing density for both samples. According to the float-sink tests, Ç
atalagzi fly ash has much more floating products and more cenospheres than Sugö
zü
fly ash for the same density interval. Based on the air classification results, cenospheres were concentrated in the underflow products, and cenosphere contents increased with increasing air pressure and decreasing motor speed for both samples. The most efficient cenosphere separation technique among the examined methods was screening. Cenosphere contents of CFA and SFA increased to 21.65% and 11.83%, respectively by only using simple screening through 38 &mu
m.
Vazifdar, Rukshana. "The addition of microsilicas to the ordinary Portland cement (OPC) system." Thesis, University of Greenwich, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309788.
Повний текст джерелаNicotera, Marco Valerio. "Effetti del grado di saturazione sul comportamento di una pozzolana del napoletano." Doctoral thesis, La Sapienza, 1998. http://hdl.handle.net/11573/917002.
Повний текст джерелаElbadri, Hatim A. "The effect of pozzolans in the stabilization of sulfide tailings." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0028/MQ50603.pdf.
Повний текст джерелаElbadri, Hatim A. "The effect of pozzolans in the stabilization of sulfide tailings /." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21290.
Повний текст джерелаThis project has studied the effect of lime-based treatments in the stabilization of two sulfide tailings, one waste predominately containing pyrite minerals and the second containing pyrrhotite minerals. Different proportions of pozzolans (fly ash and slag) were also added to the lime-tailings mixtures. The physical properties of the mixtures have been evaluated, using several tests such as strength (unconfined compressive strength), permeability and durability. The mineralogical changes in the treated wastes were also examined. The stabilization process and the treatment validity would not be complete without a chemical analysis of the treated waste; therefore a quantitative analysis was performed, including leaching and extraction tests for some elements (Zn, Mg, Ca, and Fe), and also sulfate measurement. The samples were tested after 1 and 28 days of curing time. (Abstract shortened by UMI.)
Christodoulou, George. "Freeze-thaw resistance and microstructural characteristics of concretes containing pozzolans." Thesis, University of South Wales, 2001. https://pure.southwales.ac.uk/en/studentthesis/freezethaw-resistance-and-microstructural-characteristics-of-concretes-containing-pozzolans(a9a15e52-b504-4894-8968-bd8a46d49237).html.
Повний текст джерелаKulasuriya, Chandana. "Alkali Pozzolan Cement for Integral Sustainability." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/610.
Повний текст джерелаTashima, Mauro Mitsuuchi. "Cinza de casca de arroz altamente reativa : método de produção, caracterização físico-química e comportamento em matrizes de cimento Portland /." Ilha Solteira : [s.n.], 2006. http://hdl.handle.net/11449/91490.
Повний текст джерелаBanca: Marco Antonio Moraes Alcantara
Banca: Antônio Alberto Nepomuceno
Resumo: O presente trabalho apresenta um método de produção de cinza de casca de arroz (CCA) altamente reativa e de coloração clara, bem como o seu comportamento em matrizes de cimento Portland com o intuito de avaliar a atividade pozolânica da CCA. O trabalho está dividido em quatro etapas, a saber: construção de um forno e produção da cinza de casca de arroz, caracterização físico-química da CCA, verificação da atividade pozolânica do material através de métodos instrumentais e, finalmente, ensaios mecânicos em argamassas de cimento Portland. O forno utilizado para a produção da cinza de casca de arroz não apresenta controle de temperatura e, o tempo de queima é bastante longo, aproximadamente 36 horas. Neste método obtém-se cerca de 1,5Kg de cinza por processo de queima. A cinza obtida apresenta uma coloração clara e o seu caráter amorfo foi determinado através de diferentes métodos: difração de Raio-X, determinação do teor de sílica amorfa, análise termogravimétrica, Microscopia Eletrônica de Varredura (MEV) e ensaios mecânicos em argamassas de cimento Portland. O programa experimental também abrange estudos de variação da finura da CCA e estudos com diferentes porcentagens, em substituição ao cimento Portland. Os resultados obtidos foram comparados... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This research show a method of production white amorphous Rice Husk Ash (RHA), therefore, the behaviour of RHA in Portland cement matrix to evaluate the pozzolanic activity of this material. The research can be shared in four steps, to know: construction of an oven and production of rice husk ash, physical-chemical analysis of the rice husk ash, evaluation of pozzolanic activity of the pozzolan though instrumental analysis and, finally, mechanical properties of Portland cement mortars. The oven used for production of rice husk ash didn't have a control of temperature and, the time of burning is so longer, approximately 36 hours. In this method is obtained for about 1,5Kg of ash. The obtained ash has white colour and its amorphous phase were determined though different methods: X-ray diffractometry, determination of amorphous silica, Termogravimetric Analysis (TA), scanning electron microscopy (SEM) and mechanical properties of Portland cement mortars. Besides that, the experimental procedure involves studies on fineness variation of rice husk ash and different degrees of Portland cement substitution. The obtained results were compared with silica fume, because this is the most similar pozzolanic material with rice husk ash. The RHA produced under this method can be used... (Complete abstract click electronic access below)
Mestre
Bordeian, Georgeta Simona. "Characterisation and properties of alkali activated pozzolanic materials." Thesis, Sheffield Hallam University, 2000. http://shura.shu.ac.uk/19371/.
Повний текст джерелаBondar, Dali. "Alkali activation of Iranian natural pozzolans for producing geopolymer cement and concrete." Thesis, University of Sheffield, 2009. http://etheses.whiterose.ac.uk/14553/.
Повний текст джерелаChapagain, Indra Prasad. "Mechanical properties of self-consolidating concrete with pozzolanic materials." FIU Digital Commons, 2008. http://digitalcommons.fiu.edu/etd/2111.
Повний текст джерелаDuerden, Susan Lynn. "PFA morphology, pozzolanic activity and contribution to concrete performance." Thesis, University of Dundee, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327806.
Повний текст джерелаRamezanianpour, Ali Akbar. "Properties and durability of pozzolanic cement mortars and concretes." Thesis, University of Leeds, 1987. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.640162.
Повний текст джерелаTeixeira, Joelane Maria de Carvalho. "UtilizaÃÃo dos produtos da combustÃo do carvÃo mineral como aditivos na produÃÃo de argamassa para revestimento." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11115.
Повний текст джерелаA utilizaÃÃo de resÃduos como materiais alternativos tem se mostrado uma soluÃÃo satisfatÃria de acordo com vÃrias pesquisas realizadas. Os produtos da combustÃo do carvÃo mineral (PCCs) sÃo resÃduos que causam impacto ambiental, mas apresentam grande potencial de utilizaÃÃo no setor da construÃÃo civil na produÃÃo de argamassas e concretos. Apresentam elevado teor de sÃlica (SiO2), podendo ser utilizados como pozolanas. Esta pesquisa objetivou verificar a viabilidade da utilizaÃÃo dos produtos da combustÃo do carvÃo mineral em argamassas de assentamento e revestimento. As matÃrias-primas foram caracterizadas quanto aos aspectos fÃsicos, quÃmicos e para os PCCs tambÃm foi avaliada sua pozolanicidade. Foram confeccionadas argamassas de referÃncia e com adiÃÃo de PCCs nos teores de 10, 20, 30, 40 e 50% como substituto parcial do cimento. ApÃs tempos de cura de 7 e 28 dias, foram feitos teste de resistÃncia à traÃÃo na flexÃo e resistÃncia à compressÃo. AlÃm disso, as argamassas foram sujeitas a anÃlises de difraÃÃo de Raios â X, Microscopia EletrÃnica de Varredura, absorÃÃo de Ãgua, determinaÃÃo de Ãndice de vazios e massa especÃfica aparente. Os resultados obtidos mostraram-se compatÃveis quando comparados com os dados da literatura, demonstrando ser viÃvel a aplicaÃÃo dos produtos da combustÃo do carvÃo mineral na indÃstria da construÃÃo civil.
The use of residues as alternative materials has proven successful according to several investigations. Coal combustion products (CCPs) is a residue that causes environmental impact, but it has a great potential for use in civil engineering construction in the production of mortars and concrete. It posesses a high content of silica (SiO2) and so it can be used as pozzolan. This research aimed to verify the viability of adding coal combustion products to mortars for bricklaying and covering. The raw materials were submitted to physical, and chemical characterization. CCPs were also rated according to their pozzolanicity. Reference mortars were prepared, as well as mortars containing 10, 20, 30, 40 and 50% amounts of CCPs as a partial replacement for cement. After curing time of 7 and 28 days, prismatic samples were tested to determine their tensile strength in bending and their compression strength. Moreover, the mortars were subjected to X-ray diffraction, scanning electron microscopy and determination of water absorption, voids and apparent density. The results obtained were consistent with literature data, showing that application of coal combustion products in the construction industry is a viable alternative.
Chang, E., E. Chang, J. Villalta, C. Fernandez, and G. Duran. "Improvement of physical, mechanical and strength behavior of cohesive soils with natural pozzolana and brick dust." Institute of Physics Publishing, 2020. http://hdl.handle.net/10757/651792.
Повний текст джерелаLindroos, Alf. "Carbonate phases in historical lime mortars and pozzolana concrete : implications for 14C dating /." Åbo : Department of geology and mineralogy, Åbo akademi university, 2005. http://catalogue.bnf.fr/ark:/12148/cb41081971h.
Повний текст джерелаAhmed, Mohammad Sharfuddin Aerospace Civil & Mechanical Engineering Australian Defence Force Academy UNSW. "Effects of systematic increase in pozzolanic materials on the mechanical, durability, and microstructural characteristics of concrete." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace, Civil and Mechanical Engineering, 2007. http://handle.unsw.edu.au/1959.4/38645.
Повний текст джерелаTank, Suresh Bhagwanji. "The use of condensed silica fume in Portland cement grouts." Thesis, University College London (University of London), 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307794.
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.
Kalakada, Zameer. "Experimental Investigation on Recycled Glass Powder as a Pozzolanic Cement." Thesis, Griffith University, 2020. http://hdl.handle.net/10072/393612.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
Claus, Julien. "Investigations on a new high-strength pozzolan foam material." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/31804.
Повний текст джерелаCommittee Chair: Doyoyo Mulalo; Committee Member: Will Kenneth; Committee Member: Yavari Arash. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Over, Derya. "Early Heat Evolution In Natural Pozzolan-incorporated Cement Hydration." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614533/index.pdf.
Повний текст джерела45 µ
m) of natural pozzolan-incorporated cement on hydration heat. For this purpose, a portland cement and pozzolan-incorporated blended cements containing different amounts of natural pozzolan (trass) were used. The heat of hydration was measured using isothermal calorimetry. The values of heat of hydration for mixtures with different finenesses containing different amounts of added pozzolan were determined. The results obtained were used to find a correlation between the fineness, composition of cement and heat of hydration. According to this study, pozzolan incorporation in small amounts accelerates hydration. A similar effect was obtained for higher pozzolan amounts. Finer cements react faster and result in higher amounts of early heat evolved compared to coarser cements. In addition, it was found that the sum of the heat of hydration values of fine and coarse portion of cements was less than the total heat of hydration of blended cements. Moreover, a satisfactory correlation could not be established between results of isothermal calorimetry, and adiabatic calorimetry, setting time, and strength.
Guney, Bilge Alp. "Development Of Pozzolanic Lime Mortars For The Repair Of Historic Masonry." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614330/index.pdf.
Повний текст джерелаs classification. By using fly ash, design of lime mortars with high water impermeability and high water vapour permeability characteristics was accomplished.
Rodier, Loïc. "Matériaux de construction en zone tropicale humide : Potentialités de sous-produits ou de matériaux naturels locaux en substitution ou addition à la matrice cimentaire." Thesis, Antilles-Guyane, 2014. http://www.theses.fr/2014AGUY0804/document.
Повний текст джерелаThe incorporation of crop wastes or natural materials in the cement matrix confers interesting properties to composites prepared. The aim of this thesis is to develop a material that can reach the mechanical, thermal and durability requirements for building materials in the humid tropical zone. Firstly, pozzolanic activity of a natural pozzolan, bamboo stem and sugar cane bagasse ashes has been determined. Influence of their incorporation on mechanical properties and durability of mortars exposed to chloride and sulphate ions was studied. Secondly, influence of addition of bagasse fibers on thermal and mechanical properties of composites was studied as a function of various parameters (fibers content, curing, type of cement matrix).These results has shown that the materials studied have pozzolanic activity and it is possible to incorporate them into the cement to fight against corrosion. Moreover, composites elaborated with bagasse fibers are more insulating than those elaborated without fibers. However, from the viewpoint of mechanical properties, incorporation of bagasse fibers decreases flexural strength of composites in the present work and under the conditions producing procedures that were adopted
Erdem, 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 джерелаDonatello, Shane. "Characteristics of incinerated sewage sludge ashes : Potential for pozzolanic material in construction products." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512054.
Повний текст джерелаSinthupinyo, Sakprayut. "Partially calcined limestone as a viable lime source for a sustainable pozzolanic binder." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201730.
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 джерелаMason, Blair Joseph. "The Analysis of Taupo Pumice as an Effective Partial Cement Replacement in Concrete." Thesis, University of Canterbury. Geological Sciences, 2012. http://hdl.handle.net/10092/6825.
Повний текст джерелаAdams, Andrew. "An assessment of the effects of pozzolanic activity on the behaviour of fly ash." Thesis, Durham University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342795.
Повний текст джерелаSio, Jeanette Dorol. "Influence of Pozzolanic Material in the Conversion and Corrosion Behaviour of Calcium Aluminate Cement." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12694.
Повний текст джерелаBaltazar, Luís Gonçalo Correia. "Rheology of natural hydraulic lime grouts for masonry consolidation." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/13139.
Повний текст джерелаGrist, Ellen. "The implementation of innovative and sustainable construction materials." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619149.
Повний текст джерелаDash, Ashish Kumar. "Effect of Pozzolanas on Fiber Reinforced Concrete." Thesis, 2010. http://ethesis.nitrkl.ac.in/2032/1/FINAL_PROJECT_OF_M_TECH.pdf.
Повний текст джерелаPreethi, R. K. "Studies on alkali activated compressed earth bricks for structural masonry." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4834.
Повний текст джерелаMelo, João Paulo da Silva. "Incorporação de cal em misturas cimentícias com elevados teores de adições minerais." Master's thesis, 2012. http://hdl.handle.net/1822/29493.
Повний текст джерелаA indústria do betão gera alguns problemas ambientais e de sustentabilidade associados à incorporação do Cimento Portland, cujo fabrico é, conforme sabido, altamente consumidor de energia e é responsável por cerca de 7% das emissões de CO2 para a atmosfera. As adições minerais Pozolânicas permitem substituir o Cimento, contribuindo com uma quantidade adicional de silicatos de cálcio hidratado (CSH). Para a formação do CSH adicional a pozolana tem de reagir com o hidróxido de cálcio proveniente da hidratação do Cimento, originando a reação pozolânica. Por vezes, para dosagens elevadas de adições minerais, o hidróxido de cálcio pode ser insuficiente para o bom funcionamento da reação pozolânica, situação em que pode ser necessária a sua adição. Esta reação, geralmente, produz uma redução da porosidade do betão, aferindo ao betão maior durabilidade. Esta substituição apresenta inúmeros benefícios, tanto em relação à reologia no estado fresco quanto ao comportamento mecânico no estado endurecido. Neste contexto, desenvolveu-se este trabalho tendo como principal objetivo estudar a incorporação de cal em misturas cimentícias com elevados teores de adições minerais. Concretamente pretende-se analisar o efeito da incorporação de cal como potencial ativador da reação pozolânica em misturas com quantidades reduzidas de Cimento. Adicionalmente, pretende-se, também, determinar se a adição de cal permite, ou não, dotar a composição de uma maior reserva alcalina e, assim, melhorar a sua resistência à carbonatação. Para isto, realizaram-se doze tipos de composições cimentícias com dois tipos de matriz ligante, Cimento e Cinzas volantes; e Cimento, Cinzas volantes e Metacaulino. Em todas as composições, a quantidade de substituição de Cimento por adições minerais foi de, pelo menos, 60%. Para cada um destes dois tipos de matrizes cimentícias fez-se variar o teor de cal entre 0 e 25%. Neste trabalho experimental, para a mistura ternária, observou-se uma melhoria na resistência à compressão e à carbonatação para as misturas com incorporação de cal até 15%. Esta tendência foi acompanhada nas misturas com Cimento e Cinzas volantes, onde a resistência à compressão, perto da ultima data de ensaio (90 dias), aumentou relativamente à da amostra Padrão para um teor de Cal de 5% e a resistência à Carbonatação foi melhorada independentemente do teor de cal adicionada.
The concrete industry generates some environmental and sustainability issues associated with the incorporation of Portland cement, whose manufacture is, as well known, highly energy consumer and responsible for about 7% of CO2 emissions into the atmosphere. The Pozzolanic mineral additions allow substitute the cement, contributing with an additional amount of hydrated calcium silicate (CSH). For the formation of the additional CSH, the pozzolan must react with the calcium hydroxide from the hydration of the cement, resulting in the pozzolanic reaction. Sometimes, for high dosages of mineral additions, calcium hydroxide may be insufficient for proper functioning of the pozzolanic reaction, situation in which may be necessary its addition. This reaction, usually, produces a decrease in the porosity of the concrete, assessing the concrete a bigger durability. This substitution has many benefits, for the rheology in fresh state as well as the mechanical behavior in the hardened state. In this context, this work was developed with the main objective of studying the incorporation of lime in cementitious mixtures containing large amounts of mineral additions. Specifically, it is intended to analyze the effect of the incorporation of lime as a potential activator of the pozzolanic reaction in mixtures with small quantities of cement. Additionally, the aim was also to determine whether the addition of lime allows, or not, to give the composition an increased alkalinity and thus improve its resistance to carbonation. With this purpose, there were made twelve types of cementitious compositions with two types of matrix binder, Cement and fly ash, and cement, fly ash and Metakaolin. In all compositions, the amount of cement replacement by mineral additions was, at least, 60%. For each of these two types of cementitious matrixes was used a variation of the content of lime between 0 and 25%. In this experimental work, for the ternary blend, we observed an improvement in the resistance to the compressive strength and the carbonation for the blends incorporating lime up to 15%. This tendency was accompanied in mixtures with cement and fly ash, where the compression resistance near the last day of the test (90 days) increased compared to that of the standard sample for a content of 5% of lime, and the resistance to carbonation was improved independently of the amount of lime added.
Chen, Ian-Hau, and 陳彥豪. "Durability of Pozzolanic Concrete." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/16687691703131210544.
Повний текст джерелаKOTENG, DAVID OTIENO, and DAVID OTIENO KOTENG. "DEVELOPMENT OF HIGH-STRENGTH LIME-POZZOLANA PASTE." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/26218732227464273668.
Повний текст джерела國立臺灣科技大學
營建工程系
103
Limestone which produces lime is available in large quantities in many parts of the world. Continuous formation through the deposit of shells and skeletons of land and marine animals and organisms ensures that it will always be available and is thus a sustainable material. On the other hand, fly ash and silica fume are ready-to-use industrial wastes produced respectively during the burning of coal and in the manufacture of silicon and its alloys. These materials are ideal for the production of cement for the construction industry. Lower burning temperatures of lime compared with Portland cement and the ability to blend with larger amounts of pozzolana reduce the consumption of energy and natural raw materials and the emission of CO2 during cement production, thereby making cement greener. However, low early strength has been a setback for the use of lime-pozzolana cement. This study attempts to produce lime-pozzolana paste of high strength and explores the effects of powder proportions, water-binder ratio, fineness of lime, curing conditions, and pre-soaking lime on the early strength of paste made from non-hydraulic lime, type F fly ash, and silica fume. Paste with 28-day strength of 35 MPa is obtained. The consumption of raw materials and energy and emission of CO2 are reduced by factors of 2.6, 2.7, and 2.5, respectively compared with Portland cement. However, tests show that at early ages, lime-pozzolana paste is porous and potentially less durable and prone to leaching. This setback can be mitigated by covering lime-pozzolana concrete with impervious coating after water curing.
Hsieh, Rung-Ren, and 謝鎔任. "Effect of Pozzolans on Shear Behavior of Concrete Beams." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/73185473337130000136.
Повний текст джерела國立中興大學
土木工程學系所
99
The purpose of this research is to investigate the shear behavior of reinforced concrete beams with the addition of pozzolans. A total of 20 beam specimens were fabricated in this study. All beam specimens were designed without shear reinforcement. The compressive strength of concrete in 10 of the beams was 31.30 MPa, and that in the other 10 was 51.00 MPa. Four substitute ratios of cement with slag(5 %,10 %,15 %,and 20 %), four substitute ratios of sand with fly ash(5 %,10 %,15 %,and 20 %), two substitute ratios of cement with silica fume(2.5 %,5 %), were used for each concrete strength. The test variables include concrete strength and the addition of pozzolans. (1)The cracking shear strength, ultimate shear strength, member stiffness, and crack control capability, increase with the concrete strength; but the shear ductility decreases with the concrete strength. (2)The influence of slag replacement on the cracking shear strength, ultimate shear strength, member stiffness, crack control capability, and shear ductility, is unapparent; however the cracking shear strength increases with the replacement of slag in low-strength concrete beams. (3)The cracking shear strength, ultimate shear strength, member stiffness, and crack control capability, decrease with the fly ash replacement; moreover, this phenomenon is more significant on the ultimate shear strength. (4)The cracking shear strength, ultimate shear strength, and crack control capability, increase with the silica fume replacement; but this phenomenon is not significant on the member stiffness. (5)Use of ACI code procedure to calculate λ is not conservative.
Pratibha, R. "Pozzolanic Additives To Control Dispersivity Of Soil." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2582.
Повний текст джерелаPratibha, R. "Pozzolanic Additives To Control Dispersivity Of Soil." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2582.
Повний текст джерелаWang, Chen-Jen, and 王振仁. "The Influence of Pozzolans to the Electrical Property of Concrete." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/12946516029498302970.
Повний текст джерела國立臺灣科技大學
營建工程技術學系
84
The electrical property of concrete is the crucial factor for its corrosion behavior. In the previous study of the electrcal to the performance of concrete. Test parameters are admixtures of fly ash, silica fume and blast furnace slag, different paste mixture proportion, and curing condition with different temperatures and humidities based on same W/B and paste amount. The change of specimen rrsistivity, compressive strength, MIP, SEM, permeability, pH volume and C- content are studied to understand the relationship and the electrical distinction between the concrete with or without pozzolans. Regarding the densified mixture proportion algorithm, the cement volume can be minimized and the ultimate strength will not be affected. About electrical property of concrete, if the specimen is ccured under the environment with higher relative humidity, the resistivity of the specimen will be lower than that under lower relative humidity although the inner part of concrete appears more pore solution with electrical conductivity. All above is due to the more complete hydration reaction which could densify the microstructure Besides, owing to the addition of Pozzolans, the resistances of concrete and mortar increase a lot, especially that with the addition of silica fume.
Seraj, Saamiya. "Evaluating natural pozzolans for use as alternative supplementary cementitious materials in concrete." Thesis, 2014. http://hdl.handle.net/2152/28052.
Повний текст джерелаtext
Ou, Hung-Yi, and 歐宏毅. "Influence of Adding Pozzolans on the Properties of Portland Cement Type II." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/29808971469658026153.
Повний текст джерела國立屏東科技大學
土木工程系所
95
Fly ash and furnace slag are the dispose waste both of the fossil power plant and the steel industry. Several researches and experiment show those can be recycled. They can replace the cement as the additive and make the concrete structure more environmental and then reach the economic benefit by recycling them. Because the fly ash and furnace slag have pozzolans’ characteristic, they can not only replace partial cement, but also improve and upgrade the mechanics and physical property. So this research will mainly focus on the different amount of fly ash and furnace slag as the additive, with different W/b ratio different age then explore the variety of properties and the best quantity for replacement of portland cement type II. This research shows the mechanics and physical properties with 6 different additive ratios, 3 different W/b ratios and 4 different ages. The results also show that slag/fly ash ratio(20%/20%) as the replacement with any one W/b ratio will have the best late age(56~91days) strength, the lowest absorption, the good performance both on workability and slump and the best economic benefit.
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).
WU, PEI-HONG, and 吳沛鴻. "A Study on Pozzolanic Characteristics of Silicon Carbide Sludge." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/95092313993087196580.
Повний текст джерела