利用粉煤灰、电石渣制备B05级加气混凝土砌块研究

Production of B05 Grade Aerated Concrete Block From Fly Ash and Carbide Slag

电石渣代替部分石灰用于生产蒸压粉煤灰加气混凝土砌块会影响发泡效果,为此专门研制了助发泡剂(以掺量表示):氢氧化钠0.5%,硅酸钠0.1%,微硅粉0.5%。在此基础上,掺加废加气块颗粒,发挥晶种的作用,同时实现废料循环利用。结果表明:电石渣对石灰的最大替代率可达到80%。掺入不超过5%的废加气块颗粒,可有效提高加气混凝土的力学强度,制得密度520 kg/m^(3)、抗压强度3.75 MPa的加气混凝土砌块,达到B05,A3.5(优等品)等级。

Calcium carbide slag replacing part of lime in the production of fly ash aerated concrete blocks will affect the foaming effect,so specially developed foaming additives(expressed by the dosage):NaOH 0.5%,sodium silicate 0.1%,silica powder 0.5%.On this basis,add waste aeration block particles,play the role of crystal seed,and realize waste recycling.The results show that the maximum replacement rate of calcium carbide slag to lime can reach 80%.The mechanical strength of aerated concrete can be effectively improved by adding no more than 5%waste aerated block particles,and the aerated concrete block with density of 520 kg/m^(3) and compressive strength of 3.72 MPa can be made,which can reach the grade of B05 and A3.5(excellent).