A Complex Organomineral Admixture For Cement Saving

Abstract

The aim of the research is to prepare a composition of a complex organomineral admixture based on industrial waste for cement saving, to experimentally establish the optimum crushing degree of an ash-and-slag waste composition and to estimate the ratio between mineral and organic components of the complex admixture, ensuring the possibility of reducing cement consumption without loss of concrete strength. As a mineral component of the complex admixture the wastes from thermoelectric power stations were used, representing  by an ash-and-slag waste composition crushed to a fine powder condition. Optimization of the complex admixture is carried out  using mathematical methods of the theory of planning experiments.

As a result of this research a quadratic polynomial model of influence of crushing fineness of ash-and-slag wastes and cement consumption on concrete strength has been obtained. It is established, that depending on the degree of crushing of ash-and-slag waste composition within values of specific surface of received powder from 2400 to 4000 cm²/g it is possible to reduce cement consumption by 8-18 % without loss in strength of concrete. The introduction of complex organomineral admixtures into concrete is very effective as it saves cement. However, special studies are required in each case. The compositions of the new complex admixtures are tested on the basis of traditional raw materials, and economic efficiency in saving cement is established. It is proposed to use the methodology of mathematical modelling of the technological complex system under study, presented in this article.