Analysis of the Effects of Mineral Admixtures on the Strength of Mortars: Application of the Predictive Model of Feret

Abstract

The introduction of fine and ultra‐fine mineral admixtures in cementing materials generates a granular effect, a physico‐chemical and micro‐structural effect and, possibly, chemical effect. To analyse the specific share of each effect, we propose to use a methodology based on a volume substitution of cement by admixtures in mixes whose absolute volume of the solid phases and workability are preserved constant and then only the effects of the particles of admixtures in the cementing phase are taken into account. We expressed the compressive strength of mortars with admixtures according to a factor of compactness by applying to the mortars the principles of the predictive model of Feret. This factor makes possible to distinguish the modifications generated by the granular effect of the admixtures on the compactness of the cementing matrix independently of the physico‐chemical and chemical effects. The specific chemical action of each admixture has been evaluated by analysing the variation of the coefficient of activity K according to the rate of the cement substitution, by applying to the studied mortars the concept of the equivalent binder and by deducing the coefficient of activity from the predictive model of Feret.

Influence of Cement – Sodium Silicate Grout Admixed With Calcium Chloride and Kaolinite on Sapric Peat / Saprogeninių Durpių Poveikis Cemento Ir Natrio Silikato Skiedinio Su Kalcio Chloridu Bei Kaolinitu Savybėms

“…These findings also show that the introduction of a fine mineral admixture in a cementing mixture generates significant modifications in the properties of the confection by physic-chemical, micro-structural and chemical effects and agree with the findings of Boudchicha et al (2007).…”

Effect of Different Pozzolana on Hardening Process and Properties of Hydraulic Binder Based on Natural Anhydrite

“…Such waste with pozzolanic properties as fly ash or silica fume is widely used as supplementary component for the production of common cement (EN 197-1:2011) and con-cretes. Numerous studies were dedicated to such investigations (Oliveira et al 2006;Boudchicha et al 2007). Over the last years, other wastes were investigated as pozzolanic supplementary constituents: ground glass (Shi et al 2005), matt waste (Bignozi et al 2009(Bignozi et al , 2010, municipal solid waste incinerator bottom ash (K. L. Lin, D. F. Lin 2006;Saccani et al 2005), polishing ceramic sludge (Andreola et al 2010;Bignozzi, Bonduà 2011) and etc.…”