Preparation of environmentally friendly and energy-saving autoclaved aerated con-crete using gold tailings

Abstract

In order to realize the resource utilization of gold tailings (GTS), autoclaved aerated concrete (ACC) was prepared as the main siliceous material. The optimum proportions of calcium materials in GTS AAC were obtained by adjusting the content of calcium materials, and the effect mechanism of calcium materials on AAC was studied. The results showed that when the specific surface area (SSA) of GTS is 367 m2 kg-1 and he is 62 (in mass, the same below), the ACC was prepared with bulk density of 584 kg m-3 and compressive strength of 5.85 MPa, which passed the require-ments of A3.5, B06 level of AAC sample regulated by GB/T 11969-2008. X-ray diffraction analysis (XRD) and scanning electron microscope (SEM) analysis show that the main hydration products are tobermorite, aluminum tobermorite, and CSH(B). The hydration products are inter-spersed with each other to form a cohesive structure, which effectively improve the strength of the products.