STARTING MIXTURE FOR PREPARING A NATURALLY HARDENING CELLULAR CONCRETE WITHOUT USING AN AUTOCLAVE, AND METHOD AND DEVICE FOR MANUFACTURING ARTICLES MADE OF CELLULAR CONCRETE

摘要

The present invention pertains to the building industry and more particularly to the field of construction materials. This invention more precisely relates to starting mixtures for producing cellular concrete without using an autoclave, as well as to techniques for manufacturing articles from said cellular concrete. The purpose of this invention is to reduce the power consumption, the amount of labour and the production costs of articles made of cellular concrete with autoclave-free hardening as well as to improve the quality of said articles. To this end, the starting mixture for producing a naturally-hardening cellular concrete without the use of an autoclave comprises a cement, a gas-generating agent, chlorinated sodium and water. This mixture contains as a cement a portland cement, a shrink-resistant portland cement or a self-stressing cement as well as an additional micro-silica and an S-Z super-plastifier. These components are selected in the following proportions relative to the cement: 1 part by weight of cement; between 0.005 and 0.01 part by weight of chlorinated sodium or calcium; between 0.04 and 0.1 part by weight of micro-silica; between 0.002 and 0.05 part by weight of S-Z super-plastifier; between 0.0016 and 0.002 part by weight of a gas-generating agent (aluminium powder); and between 0.3 and 0.4 part by weight of water. This invention also relates to a method and a device for producing construction articles from this naturally-hardening cellular concrete without using an autoclave. This method comprises maintaining steam-saturation conditions in a thermally insulated chamber by vaporising the water from the articles during their exothermic heating without using any additional heating source. To this end, the chamber is provided with an inner coating made of a water-resistant and vapour-impermeable material.