摘要
为了在综合利用固体废弃物的同时减少煅烧石灰所带来的CO2排放,采用铜尾矿-矿渣-水泥熟料-风积砂原料体系制备压加气混凝土,以富钙、镁的铜尾矿和矿渣代替传统加气混凝土所需的石灰.具体研究了各原料组份对加气混凝土物理力学性能的影响,得到B06级铜尾矿加气混凝土的优化配合比为:铜尾矿、矿渣、风积砂、水泥熟料、石膏的质量分数分别为30%、35%、20%、10%、5%.所制备的B06级蒸压加气混凝土的绝干密度为610.2 kg.m-3,抗压强度为4.0 MPa,达到了《蒸压加气混凝土砌块》(GB 11968—2006)规定的A3.5、B06级加气混凝土合格品的要求.物相分析显示,所制备的加气混凝土中主要结晶相是板状的托贝莫来石、硬石膏、残留的石英以及来自原始铜尾矿中的残留矿物.
Copper tailings,blast furnace slag,eolian sand,a small amount of clinker and gypsum were used as raw materials to prepare autoclaved aerated concrete（AAC）.Lime was substituted by Ca and Mg rich copper tailings and blast furnace slag to reduce the CO2 emission brought by limestone calcinations.This study focused on the effect of different component of raw materials on the physical and mechanical properties of AAC.The optimal proportion of major raw materials for a B06 grade AAC is as follows：copper tailings 30%,blast furnace slag 35%,eolian sand 20%,clinker 10% and gypsum 5%.The prepared AAC sample has bulk density of 610.2 kg·m-3 and compressive strength of 4.0 MPa,which can reach the requirements of A3.5,B06 level of AAC product regulated by ＂autoclaved aerated concrete block＂ GB 11968—2006.Microstructure analyses show that the main crystalline phases in the AAC sample are tobermorite,anhydrite,residual quartz and residual minerals from copper tailings.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2012年第1期11-15,共5页
Materials Science and Technology
关键词
铜尾矿
加气混凝土
配合比
抗压强度
copper tailings
autoclaved aerated concrete
mixing proportion
compressive strength
