The Raw Materials Genetic Characteristics Role in Autoclave Cellular Concrete Carbonation Process

Abstract

Nowadays, in order to design durable construction materials all collected knowledge on material science as well as modern technologies allow solving the problems by applying mimicry or nature-like are technologies based on interdisciplinary study of geonics. Considering the principles of geology, it is important to study the influence of genetic characteristics of raw materials on structural performance and durability of final construction materials. The following paper focuses on assessment of effect of genetic characteristics of industrial by-products such as materials derived from iron-ore production at the Kursk Magnetic Anomaly on carbonation resistance in autoclave cellular concrete was studied. The secondary products of ore rigging process, the screening fraction of sandstone, shale rocks as well as tailings of wet magnetic separation were used as a quartz-bearing mineral components. The evaluaton parameters in this study were compressive strength, density and carbonation resistance of autoclave cellular concrete (ACC) specimens. The carbonation process was reproduced in laboratory prepared concrete. In order to eccelerate carbonation reaction all specimens were stored in a sealed chamber saturated with CO2. The density and compressive strength characteristics of ACC with regular quartz sand were 630 kg/m3and 3.6 МPа, respectively. The same parameters were slightly higher in case of full replacement of quartz sand by sand stone and demonstrated 655 kg/m3and 3.9 МPа, respectively, and carbonation resistance was increased by 20 %. The results support the view, that screening fraction of sandstone that had been formed under natural metamorphosis is more preferable for use in ACC production. Full replacement of regular quartz sand by sand stone in ACC specimens showed improved compressive strength and carbonation resistance.