Results 161 to 170 of about 6,053,575 (214)
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Pozzolanic activation of metakaolin
Advances in Cement Research, 1992Metakaolin 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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The measurement of pozzolanic activity
Cement and Concrete Research, 1977Abstract Some comments are made on the applicability of the hydrofluoric acid method for determining pozzolanic activity. It is pointed out that in addition to silica some other constituents of pozzolanic materials such as pfa are also soluble in HF and the conductance of the solution may, therefore, not be directly relatable to the active silica ...
A.J. Majumdar, L.J. Larner
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Evaluation of pozzolanic activity of natural and artificial pozzolans by thermal analysis
Thermochimica Acta, 2004Abstract In this research, the pozzolanic activity of natural and artificial pozzolan used for preparation of restoration mortars was evaluated. For this purpose, several pastes were prepared, by mixing two artificial pozzolans and a natural one with commercial hydrated lime, in different ratios. The pastes were cured in standard conditions (RH = 98%,
Antonia Moropoulou +2 more
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Pozzolanic activity tests as a measure of pozzolans' performance. Part 1
Magazine of Concrete Research, 2007The 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 activity tests as a measure of pozzolans' performance. Part 2
Magazine of Concrete Research, 2007Part 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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Evaluation of the activity of pozzolanic materials
Journal of Applied Chemistry and Biotechnology, 1974AbstractCompressive strength and solubilisation tests were carried out to evaluate the pozzolanic activity of some natural and artificial materials. Strength tests were performed on mortar made with cements composed of 61% Portland cement clinker, 35% pozzolanic material and 4% gypsum.
Kaissar M. Hanna, Aly Afify
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Pozzolanic activity of natural pozzolan–lime pastes and physicomechanical characteristics
Journal of Thermal Analysis and Calorimetry, 2018In 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 of Hwangtoh clay
Construction and Building Materials, 2010Abstract Hwangtoh is a clay that has long been used as a traditional Korean building material. In these days, Hwangtoh is often used for plastering and flooring in newly constructed buildings to minimize sick building syndrome. In such applications, it is useful to determine whether the clay has pozzolanic properties. In this research, the pozzolanic
Seong-Seok Go +3 more
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Pozzolanic Activity of Diatomaceous Earth
Journal of the American Ceramic Society, 2010Lime–diatomaceous earth cement pastes were fabricated at room temperature starting with a mixture of diatomaceous earth (DE), lime, and water. The cementing phase, associated with the pozzolanic reaction of the diatom skeletons with lime, was identified as calcium silicate hydrate (C–S–H) gel using X‐ray diffraction, scanning ...
Eva Jud Sierra +4 more
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