煤渣泡沫轻质土制备及性能研究

Research on Preparation and Properties of Light Cinder Foam Soil

为提高煤渣利用率,采用电厂煤渣为集料制备泡沫轻质土,研究不同煤渣种类、细度及掺量对泡沫轻质土工作性能、力学性能和软化系数的影响规律。结果表明:泡沫土的密度与煤渣密度呈正相关,与1 h吸水率呈负相关;抗压强度与煤渣的密度和筒压强度呈正相关;软化系数随煤渣筒压强度和1 h吸水率的增大先降低后升高。以多孔疏松块状结构煤渣(SS)为骨料,控制其细度模数介于2.3~3.5之间,掺量不超过65%时,制备而成的泡沫轻质土力学强度及耐水性能良好,可以满足水下减载回填的设计要求。

In order to improve the utilisation rate of cinder,the foam lightweight soil was prepared by using power plant cinder as aggregate,and the influence law of different cinder types,fineness and dosage on the mechanical properties of foam lightweight soil was studied.The results show that:the density of foam soil is positively correlated with the density of cinder,and negatively correlated with 1 h water absorption;the compressive strength is positively correlated with the density and cylinder compressive strength of cinder;the softening coefficient decreases and then rises with the increase of cinder cylinder compressive strength and 1 h water absorption.When porous loose bulk structure cinder(SS)is used as aggregate,controlling the modulus of its fineness between 2.3~3.5,and the mixing amount not more than 65%,the mechanical strength and water resistance of foamed light soil are good,which can meet the design requirements of underwater lightening and backfilling.