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Physical and mechanical characteristics of cement mortars and concretes with addition of clinoptilolite from Beli Plast deposit (Bulgaria), silica fume and fly ash

Published online by Cambridge University Press:  09 July 2018

V. Lilkov ,
I. Rostovsky  and
O. Petrov
V. Lilkov*
Affiliation:
University of Mining and Geology “St. Ivan Rilski”, Sofia, Bulgaria
I. Rostovsky
Affiliation:
Central Laboratory of Physico–Chemical Mechanics, Bulgarian Academy of Sciences, Sofia, Bulgaria
O. Petrov
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences; Sofia, Bulgaria
*
*E-mail: lilkov@abv.bg
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Abstract

Cement mortars and concretes incorporating clinoptilolite, silica fume and fly ash were investigated for changes in their physical and mechanical properties. It was found that additions of 10% clinoptilolite and 10% Pozzolite (1:1 mixture of silica fume and fly ash) were optimal for improvement of the quality of the hardened products, giving 8% and 13% increases in flexural and compressive strength respectively. The specific pore volume of the mortars incorporating zeolite decreased between the 28th and 180th day to levels below the values for the control composition due to the fact that clinoptilolite exhibits its pozzolanic activity later in the hydration. In these later stages, pores with radii below 500 nm increased at the expense of larger pores. The change in the pore-size distribution between the first and sixth months of hydration occurs mostly in the mortars with added zeolite.

Keywords

cementpozzolanpozzolanic activitypozzolanic additivezeolitemortarconcretecement–zeolite mortarclinoptilolitesilica fumefly ashBeli Plast depositBulgaria
Type
Research Article
Information
Clay Minerals , Volume 46 , Issue 2 , June 2011 , pp. 213 - 223
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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