The use of low clinker binders in the production of autoclaved aerated concrete by cutting technology

Vasyl Serdyuk,Nataliia Dyuzhilova,Dmitrii Rudchenko

doi:10.15587/1729-4061.2020.217308

Abstract

The possibilities of optimization of cutting technology for the production of autoclaved aerated concrete and the use of low-clinker binders in it are investigated. Taking into account the price factor, energy-ecological trends in the development of the industry of building wall and heat-insulating materials, autoclaved aerated concrete has significant prospects for the development of production.With the transition to the production of autoclaved aerated concrete of lower density, on the one hand, the total material consumption of production decreases, and on the other, the specific costs of the binder (cement) per unit mass of aerated concrete increase. The research was aimed at implementing a number of technological solutions. They imply a decrease in the energy intensity of production by minimizing the clinker component in the raw mix and an intensification of the production process in order to increase the coefficient of the structural quality of the material, as well as the possibility of mass production of low-density aerated concrete. Reducing the clinker component by replacing it with active mineral additives, blast-furnace granular slag, under the conditions of cutting technology, is possible provided that the problem of accelerating the plastic strength gain of aerated concrete raw material at the stage of formation of its macrostructure is solved.It has been established that the implementation of forced synthesis of ettringite at the stage of formation of aerated concrete mixture with a high W/T ratio reduces the time of pre-autoclave holding of the raw massif. This allows the use of mineral additives and enhances the strength of the final product. Replacing 10–15 % of cement with the GBFS addition in the composition of the aerated concrete mixture in the presence of an additional content of gypsum stone of 5–10 % in the composition of sand slime provides an intensive increase in the plastic strength of the raw material before cutting it into products and high strength of the final product

Highlights

Autoclaved aerated concrete combines excellent structural and thermal insulation properties
When using the cutting technology for the production of autoclaved aerated concrete, a rather significant technological stage was the need to hold the massif and the need to accelerate the growth of the plastic strength of aerated concrete raw material, which is necessary for its cutting
It is the problem of the need for a rapid increase in the plastic strength of aerated concrete mixture with a high watersolid ratio (W/T = 0.6⋅0.7) with the lithium technology that requires a comparison in time of the rate of lime slaking, gas evolution, the kinetics of hydration of the clinker component of the mineral binder to the rapid recruitment of aerated concrete raw plastic strength

Summary

Introduction

Autoclaved aerated concrete combines excellent structural and thermal insulation properties. General technical conditions» changes were made – in subdivision 4.1 under the D200 brand were added the D100 and D150 brands as effective mineral thermal insulation (Table 1). Such changes motivate scientists and autoclaved aerated concrete manufacturers to improve the technology of its production. Manufacturers of autoclaved aerated concrete are interes ted in the implementation of a number of technological solutions aimed at intensifying production, increasing the coefficient of structural quality of the material, switching to the production of wall blocks of lower density, and reducing the energy consumption of production by minimizing the clinker component of the mineral binder. Expanding the resource base in the production of autoclaved aerated concrete using cutting technology by using a low-clinker binder is an urgent scientific and technical task that simultaneously solves a number of energy and environmental problems

Literature review and problem statement

The aim and objectives of research

Features of cutting technology for the production of aerated concrete

Findings

Conclusions