Results 161 to 170 of about 12,404 (205)

Role of the morphology and the dehydroxylation of metakaolins on geopolymerization

Applied Clay Science, 2010
Two commercial metakaolins were tested during partial geopolymerization with potassium silicate in order to emphasize the different surface reactivities. Both manual and short-term mechanical stirring were used for slurry preparation, while radiation, infrared, and microwave heating were used for curing.
V. Medri, S. Fabbri, J. Dedecek, Z. Sobalik, Z. Tvaruzkova, VACCARI, ANGELO   +5 more
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Metakaolin as a radon retardant from concrete

Radiation Protection Dosimetry, 2003
Granite aggregates are known to be the radon source in concrete. Recently, metakaolin has been introduced as a partial substitution of Portland cement to produce high strength concrete. It can effectively reduce the porosity of both the matrix and the aggregate/paste transition zone, which suggests its ability to retard radon emission from concrete ...
B M F, Lau, R V, Balendran, K N, Yu
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The effect of metakaolin upon the formation of ettringite in metakaolin–lime–gypsum ternary systems

Journal of Thermal Analysis and Calorimetry, 2017
The present study reports the results of investigation on the role of metakaolin in the formation of ettringite in a model relevant to Portland cement. The model consists of ternary system (Trio) metakaolin–lime–gypsum. Five samples of defined ternary system were cured at different temperatures 20, 30, 40, 50 and 60 °C.
Martin Palou, Eva Kuzielová, Matúš Žemlička, Radoslav Novotný, Jiří Másilko   +4 more
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Metakaolin–nanosilver as biocide mullite precursor

International Journal of Materials Research, 2012
Abstract Incorporation of silver nanoparticles enhances the biocide functionality of Ag supported kaolinite/metakaolite materials. In this regard, structural evolution of supports in the presence of silver nanoparticles is investigated.
Cabal, Belén, Sanz Lázaro, Jesús, Díaz, Luis A., Torrecillas, Ramón, Moya, J. S.   +4 more
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The effect that the pozzolanic reaction of metakaolin has on the heat evolution in metakaolin-cement mortars

Cement and Concrete Research, 2000
[EN]The hydration heat of mortars or concretes may be decreased by means of pozzolanic additions. Materials that exhibit pozzolanic activity can decrease the hydration heat by means of cement substitution, which increases the heat generated in hydration due to the pozzolanic reaction.
Frías, Moisés, Sánchez de Rojas, María Isabel, Cabrera, J.   +2 more
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Properties of Metakaolin blended cements

Advanced Cement Based Materials, 1994
Abstract Metakaolin is a supplementary cementitious material with pozzolanic properties. Its activation by triacalcium silicate (C3S), triacalcium aluminate (C3A), and ordinary Portland cement is reported. The early hydration period of pastes containing metakaolin was investigated using isothermal calorimetry and conductivity.
Jean Ambroise, Sandrine Maximilien, Jean Pera   +2 more
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Metakaolin in white cement mortars

2007
Here are presented thè results of an experimental study conducted to investigate thè physical- mechanical performance of white cement bound products. White cement is a key ingredient in buildings with unplastered concrete blockwork facades of special architectural value.
MELONI, PAOLA, MASSIDDA L, CARCANGIU G.
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Characteristics and applications of flash metakaolins

Applied Clay Science, 2013
Abstract This paper presents physical, chemical and mechanical characteristics of metakaolins obtained from an industrial flash calciner, in order to compare their properties with standard industrial metakaolin produced in a rotary kiln calciner. Three kaolins, with three levels of purity, were calcined by these two different methods to give six ...
San Nicolas, Rackel, Cyr, Martin, Escadeillas, Gilles   +2 more
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Bio-functionalization of metakaolin for better performance of metakaolin mortars

Applied Clay Science, 2023
Yonghui Wang, Hu Fang, Peiyuan Chen, Chunning Pei, Jin Li, Xin Shen   +5 more
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Sulphate Resistance of Metakaolin Mortar

Cement and Concrete Research, 1998
Abstract The partial substitution of cement (both high C3A and intermediate C3A) with metakaolin (MK) is investigated in terms of resistance of MK mortar to sodium sulphate (Na2SO4) solution. Results on strength, porosity, pore size distribution, and calcium hydroxide (CH) contents are also reported.
J.M Khatib, S Wild
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