Influence of type of cement on properties of foam concrete modified with a complex additive

Abstract

It is currently known that one of the effective materials for maintaining the required thermal regime of buildings and structures is porous concrete, in particular foam concrete. It is established that the modification of foam concrete with a complex mineral-organic additive, which consists of polyalcohol and a component containing iron, will allow to obtain foam concrete with increased strength and reduced shrinkage. It is determined that the properties of foam concrete are influenced by the mineralogical composition of cement. At present, most cement companies produce cements that contain various additives. First of all, the most common additive is blast furnace granulated slag. Therefore, the influence of this - the main additive on the properties of foam concrete mixture and foam concrete when using a complex mineral-organic additive was first determined. The aim of the experiments was to study the effect of cement on the properties of foam concrete modified with a complex additive, in particular on density. The results of experiments showed that the content of blast furnace granulated slag in cement significantly affects the density of the obtained cellular cement stone. Increasing the content of blast furnace granulated slag in the cement leads to a decrease in the density of the system with the same content of complex additives and the composition of the cement paste. When using Portland cement PC II / B-Sh-400, which contains blast furnace granulated slag, increasing the content of polyalcohol to a certain limit, regardless of the content of aggregate leads to an increase in the density of concrete. Further increase in the amount of polyalcohol leads to a decrease in the density of concrete. What can be explained by the fact that polyalcohol physically binds a significant amount of water that does not evaporate when drying concrete.

The conducted researches allow to draw a conclusion that the type (mineralogical composition) of cement influences properties of foam concrete mix. The components of the complex additive (polyalcohol and iron-containing component) lead to additional activation of the blast furnace granular slag, which is part of the cement.