In order to value glass in the production of cement and concrete. We have verified the effect of the progressive substitution of 10% to 50% of the volume of cement by glass powder and silica fume on the mechanical properties of hardened mortars, we have also verified their inhibitory effect of the Alkali Silica Reaction (ASR) by studying the variation of mass, expansion, opening and density of cracks as well as the loss of mechanical performance of mortars undergoes a test that accelerates the ASR by autoclave. We have concluded that the use of these mineral admixtures can improve the mechanical performance of mortars, and it can reduce expansions and mechanical performance losses due to ASR.
Abstract. We propose in this study to determine the role of mineral admixtures on the properties of cementitious materials in order to define a formulation method allowing an optimization of their use and the improvement of the rheological and mechanical properties of the mortars. In order to meet the objectives of this study, and to evaluate the effects that mineral admixtures may have on the properties of mortars in the fresh and hardened state, we have proposed to use a specific method based on progressive volume substitution of cement by the mineral admixtures, in order to preserve the absolute volume of all the solid constituents and the consistency for all the mixtures. The use of the mineral admixtures in the mortars also has for objective to valorize a category of natural materials or coproducts available in Algeria. As a result, the mineral admixtures chosen for this study are Blast furnace Slag, natural pozzolan and silica fume. Then the effect of the mineral admixtures on the rheological and mechanical properties of the mortars was evaluated according to the substitution rate of the cement. We applied to the studied mortars the notion of equivalent binder in order to calculate the coefficient of activity (K) defined by the two theoretical formulas Féret and Bolomey. The specific chemical action of each mixture was evaluated by analysing the variation of the coefficient of activity K as a function of the rate of substitution of the cement.
We propose in this study to determine the role of mineral admixtures on the properties of cementitious materials in order to define a formulation method allowing an optimization of their use and the improvement of the rheological and mechanical properties of the mortars. In order to meet the objectives of this study, and to evaluate the effects that mineral admixtures may have on the properties of mortars in the fresh and hardened state, we have proposed to use a specific method based on progressive volume substitution of cement by the mineral admixtures, in order to preserve the absolute volume of all the solid constituents and the consistency for all the mixtures. The use of the mineral admixtures in the mortars also has for objective to valorize a category of natural materials or coproducts available in Algeria. As a result, the mineral admixtures chosen for this study are Blast furnace Slag, natural pozzolan and silica fume. Then the effect of the mineral admixtures on the rheological and mechanical properties of the mortars was evaluated according to the substitution rate of the cement. We applied to the studied mortars the notion of equivalent binder in order to calculate the coefficient of activity (K) defined by the two theoretical formulas Féret and Bolomey. The specific chemical action of each mixture was evaluated by analysing the variation of the coefficient of activity K as a function of the rate of substitution of the cement.
A significant concern when designing durable concretes structures is the risk of alkali silkai reaction (ASR). The cracks formed by ASR increase the permeability of concrete, reduce the strength and lower the economic lifetime of concrete. The use of mineral and chemical admixtures to prevent expansion due to the alkali-silica reaction (ASR) was first reported 40 to 50 years ago. In this paper, a comprehensive experimental research was carried out to prevent the damages and to be able to improve in concrete structures with the reactive aggregates by using the ground granulated blast-furnace slag (GGBFS) in the mixtures. Furthermore, the engineering properties of blast-furnace slag and the test methodology used in the research were presented and the research findings were also discussed.
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