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Study of the pozzolanic activity and hydration products of cement pastes with addition of natural zeolites

Published online by Cambridge University Press:  09 July 2018

V. Lilkov ,
O. Petrov ,
V. Petkova ,
N. Petrova  and
Y. Tzvetanova
V. Lilkov*
Affiliation:
University of Mining and Geology “St. Ivan Rilski”, Sofia, Bulgaria
O. Petrov
Affiliation:
Institute of Mineralogy and Crystallography – Bulgarian Academy of Sciences; Sofia, Bulgaria
V. Petkova
Affiliation:
Institute of Mineralogy and Crystallography – Bulgarian Academy of Sciences; Sofia, Bulgaria
N. Petrova
Affiliation:
Institute of Mineralogy and Crystallography – Bulgarian Academy of Sciences; Sofia, Bulgaria
Y. Tzvetanova
Affiliation:
Institute of Mineralogy and Crystallography – Bulgarian Academy of Sciences; Sofia, Bulgaria
*
*E-mail: [email protected]
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Abstract

This paper presents results from comparative thermogravimetric, calorimetric and pozzolanic activity analyses of five natural zeolite samples from Bulgaria, Slovakia, Philippines, USA and North Korea. The zeolites actively participate in the hydration processes of cement. Their activity in the early stage of hydration is based mainly on the large surface area of the particles while, in the later stages of activation, chemical reactions occur between the products of the hydration of cement and the soluble SiO2 that is present in the bulk of the zeolites. It has been shown that in all cement pastes which contain zeolite additives, the quantity of portlandite is lower than that in pure cement paste or is even totally absent. The amounts of hydration products are greater when 30% zeolite is used than when 10% zeolite is added (excluding the sample with chabazite). The lowest pozzolanic activity is shown by chabazite, which possessed the lowest SiO2/Al2O2 ratio.

Keywords

cement–zeolite pasteszeolitesclinoptilolitemordenitechabazitepozzolanic activityhydration products
Type
Research Article
Information
Clay Minerals , Volume 46 , Issue 2 , June 2011 , pp. 241 - 250
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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