Results 171 to 180 of about 13,771 (226)

Pozzolana and Pozzolanic Cements—A Review Part—II: Pozzolanic Cements

Transactions of the Indian Ceramic Society, 1983
In this review pozzolanic cements have been discussed. A certain amount of pozzolana can be mixed with Portland cement to yield pozzolanic cements and thus the mixture becomes economic as well as inter-reactive. The specific advantages are its better strength, improved workability, less heat of hydration, less shrinkage and greater resistance to ...
C. Samanta, M. K. Chatterjee
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Pozzolanic activity of natural pozzolan–lime pastes and physicomechanical characteristics

Journal of Thermal Analysis and Calorimetry, 2018
In order to evaluate the pozzolanic activity of a natural pozzolan (NP) of rhyolitic composition, several pastes were prepared by mixing the pozzolan with hydrated lime, in different ratios. The pastes were stored in standard conditions (RH = 99 ± 1%, T = 25 ± 1 °C) and evaluated using thermal analysis (TG-DTA), X-ray diffraction, compressive strength ...
Asterios Bakolas, Eleni Aggelakopoulou
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Pozzolanic activity tests as a measure of pozzolans' performance. Part 1

Magazine of Concrete Research, 2007
The current methodologies used for the selection and classification of pozzolans present certain chemical and physical requirements that may restrict their use. A good example of this is the use of the pozzolanic activity index as the main parameter in the selection and classification of pozzolans. This is determined by several different methodologies
G. P. Gava, L. R. Prudêncio
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Pozzolanic activation of metakaolin

Advances in Cement Research, 1992
Metakaolin may be calcined without grinding and suitably activated by Ca(OH)2, Na2SO4, CaSO4 (beta anhydrite) and/or NaOH. The best strengths, 50 MPa from mortar cubes at 18 months, were obtained using Ca(OH)2 and CaSO4 activators. The handling and set properties are similar to those of Portland cement; aluminous C-S-H gel is the best binder.
P. S. De Silva, F. P. Glasser
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Effects of pozzolanic and non-pozzolanic nanomaterials on cement-based materials

Construction and Building Materials, 2019
Abstract Although it has been verified that nanomaterials can improve the properties of cement-based materials, the research on the characteristics and mechanism of different types of nanomaterials is still inadequate. Two typical types of nanomaterials, nano-SiO2 (pozzolanic material) and nano-TiO2 (non-pozzolanic material), are utilized in this ...
Huigang Xiao, Fengling Zhang, Rui Liu, Rongling Zhang, Zhiguo Liu, Hongxia Liu   +5 more
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Pozzolans and the Pozzolanic Reaction

1990
The most often used mineral admixture in the modern concrete industry is the pozzolan. A pozzolan, and there are many of them, is defined as “siliceous or siliceous and aluminous materials which in themselves possess little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide
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Pozzolanic activity tests as a measure of pozzolans' performance. Part 2

Magazine of Concrete Research, 2007
Part 1 of the current paper demonstrated the lack of agreement between the results obtained from different standard pozzolanic activity tests. This can be explained by the significant differences observed in the recommended test procedures that, in some cases, allow variations in parameters which have a remarkable influence on the pozzolanic reaction.
G. P. Gava, L. R. Prudêncio
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Pozzolan

1969
Abstract Pozzolans are finely divided siliceous or siliceous and aluminous materials that are by themselves of little or no cementitious value but that react with calcium hydroxide in the presence of water at ordinary temperatures to form cementitious compounds.
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POZZOLAN AND CEMENTS WITH POZZOLAN

2015
Yapı mühendisliğinin temel malzemelerinden olan çimento, yapının dayanımı ve maliyeti bakımından önemli bir yere sahiptir. İnşaat sektöründeki gelişmeye paralel olarak çimento tüketimi de artmaktadır. Çimento üreticileri açısından, yeni yeni kaynaklar bulunarak üretimin minimum maliyetle yapılması ve talebin karşılanması, yapımcı ve kontrolluk ...
KAPLAN, Hasan, BİNİCİ, Hanifi
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Pozzolanas and Pozzolanic Materials

2019
Developments in concrete construction mean that there are now a broader range of cementitious materials, than have traditionally been available, providing options for engineers to meet specific technical requirements. Pozzolanas and pozzolanic materials from natural deposits or industrial processes represent a group within this category.
McCarthy, Michael John, Dyer, Thomas Daniel   +1 more
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