矿粉气泡混合轻质土组成设计及性能试验研究

发布时间：2019-01-01 19:21

【摘要】：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。
[Abstract]:Through orthogonal test, the design parameters of mixture ratio of mineral powder and bubble mixed light soil for subgrade replacement are put forward, and the amount of cementing material and mineral powder is studied when the water / binder ratio is in the range of 0.5 ~ 0.6. The effect of water-binder ratio on compressive strength was studied by systematic test. The results show that the initial mixture ratio of mineral powder bubble mixed light soil is: cement: ore powder: foaming agent: water = 1: 0.54: 0.03: 0.85; The order of influence on the compressive strength of light soil mixed with bubbles is as follows: the amount of cementitious material and the ratio of water to binder; With the increase of water-binder ratio, the dry shrinkage of each age increases first, then decreases and then increases, the dry shrinkage rate of water-binder ratio 0.55 is the smallest, while the loss of compressive strength increases first and then decreases after freeze-thaw cycle, and the loss rate of compressive strength of water-binder ratio 0.6 is the smallest. With the increase of mineral powder content, the dry shrinkage decreases first and then increases, and the shrinkage rate of 35% mineral powder is the smallest, while the loss rate of compressive strength increases gradually after freeze-thaw cycle, and the loss rate of compressive strength with 15% mineral powder content is the smallest.
【作者单位】：长沙理工大学交通基础设施安全风险管理行业重点实验室;
【基金】：内蒙古自治区交通运输厅建设科技项目(NJ-2015-35) 长沙理工大学交通基础设施安全风险管理行业重点实验室开放基金长沙市科技计划项目(kh1601182)
【分类号】：U416.1

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