水泥-聚苯乙烯轻质材料的准静态压缩力学行为

Mechanical Performance of EPS cement based Lightweight Materials upon Quasi static Compressive Tests

摘要:

根据Gibson Ashby模型中的多孔材料力学行为理论，对水泥聚苯乙烯轻质材料的准静态压缩应力应变曲线进行了预测，并通过试验对其进行验证，分析了纤维、乳胶粉、压缩比及养护方式对应力应变曲线的影响.讨论了脆性抗压强度的变化规律，根据Gibson模型的强度理论拟合、分析了抗压强度与密度的关系.结果表明：材料的压缩应力应变曲线可根据Gibson理论中弹性多孔材料和弹脆性多孔材料的应力 应变曲线进行复合，预测结果与实验结果基本一致；纤维、乳胶粉、压缩比和养护方式对曲线的线弹性、平台、密实化三个阶段均有一定的影响，也影响材料的脆性抗压强度；纯水泥组、加纤维组和高压缩比组脆性抗压强度的拟合相关性较高，而由于乳胶粉和蒸汽养护影响了孔壁的破坏强度，所以该两组的拟合相关性较低.

Abstract:

The compressive stress strain curve of EPS cement based lightweight materials was presumed based on the porous materials’ Gibson Ashby theory. The presumptions were compared with experimental results. The influences of fiber, latex, compress ratio and curing condition on the stress strain curves were analyzed. The diversification of brittle compressive strength was investigated. The relationship between compressive strength and density was also fitted according to Gibson Model. The results figure out that the stress strain curve can be treated to be formed from those of elastic porous materials and elastic brittle porous materials, and that the presumptions show good correspondence to the experimental results. Fibers, latex, compress ratio and curing condition will affect the Linear Elastic, Plateau and Densification of the stress strain curves, as well as the brittle compressive strength. The compressive strength and density of Series C, F and H can be fitted well under Gibson Model. Series L and S cannot be fitted so exactly owing to the differential of the strength of pore wall to the model.