通过正交试验提出了用于路基换填的矿粉气泡混合轻质土配合比设计参数，并研究了当水胶比在0.5~0.6范围内时胶凝材料用量、矿粉掺量、水胶比对其抗压强度的影响规律，进一步通过系统试验对其干缩和抗冻性进行了研究。结果表明：矿粉气泡混合轻质土的初步配合比为：水泥∶矿粉∶发泡剂∶水=1∶0.54∶0.03∶0.85；对气泡混合轻质土抗压强度影响的顺序大小为：胶凝材料用量>矿粉掺量>水胶比；随水胶比增大，其各龄期干缩率先增大后减少再增大，水胶比0.55的干缩率最小，而其冻融循环后的抗压强度损失率先增大后减小，水胶比0.6的抗压强度损失率最小；随矿粉掺量增加，其各龄期干缩率先减小后增大，矿粉掺量35%的干缩率最小，而其冻融循环后的抗压强度损失率逐渐增大，矿粉掺量15%的抗压强度损失率最小。
The mixture ratio design parameters of FCB with slag powder using in roadbed replacement were proposed by orthogonal experiments, and the effects on compressive strength of FCB of amount of cementitious materials, dosage of slag powder and water binder ratio were studied when the water binder ratio is in the range of 0. 5-0. 6, further the drying shrinkage and frost resistance of FCB were studied. The results show that the ratio of cement, slag powder, foaming agent and water is 1∶0. 54∶0. 03∶0. 85 is the initial mixture ratio of FCB with slag powder. The effect order on the compressive strength of FCB is amount of cementitious materials, dosage of slag powder, water binder ratio, with the water binder ratio increases at each age, the dry shrinkage rate first increases,and then decreases, finally increases again, the smallest is of the water binder ratio is 0. 55, and after freezing and thawing cycles, the compressive strength loss rate increases and then decreases, the smallest is of the water binder ratio is 0. 6, with the dosage of slag powder increases at each age, dry shrinkage rate first decreases and then increases, the smallest is of the dosage of slag powder is 35%, and after freezing and thawing cycles, the compressive strength loss rate increases gradually, the smallest is of the dosage of slag powder is 15%.
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