关键词: 废弃混凝土;水泥复合土;多元线性回归方程;无侧限抗压强度;龄期;水泥掺量

Abstract: In order to study the function of the composite cement soil in construction waste dispose, specimens of composite cement soil mixed in un-sieved wasted concrete particle were made, various cement proportion and wasted concrete particle proportion was designed,unconfined compressive strength test was conducted,the unconfined compressive strength of composite cement soil in different curing time was studied, the multiple linear regression model of unconfined compressive established by SPSS software.Experimental results showed that suitable range of wasted concrete particle proportion does exist,the suitable range move toward right side of the number axis as the increase of cement proportion, excessive low cement proportion can weaken the compressive strength of composite cement soil, as the increase of the wasted concrete particle proportion,the particle form a skeleton which caused the increase of compressive strength, the excessive wasted concrete particle proportion can cause the decrease of compressive strength.The potential strength growth of the composite cement soil is large, which can maintain the velocity of 0.14 MPa/d during 28-60 d time section.The study can expand new direction of cement soil application and provide data of the solution in wasted concrete accumulation problem.

Key words: wasted concrete;composite cement soil;multiple linear regression equation;unconfined compressive strength;curing time;cement proportion