基于正交试验的EPS轻型混凝土配合比设计及性能研究

摘要/Abstract

摘要： 保温性能和抗冻性能对衡量功能一体化材料耐久性,以及促进绿色节能、减排具有重要影响。借助正交试验方法,以聚苯乙烯(EPS)掺量、水胶比、聚甲醛(POM)纤维掺量为影响因素,开展EPS轻型混凝土的力学性能、保温性能及抗冻性能试验,并对试验结果进行极差分析和AHP-CRITIC混合加权分析,得到综合性能最佳的EPS轻型混凝土基础配合比。结果表明:EPS掺量对EPS轻型混凝土力学性能影响最大,POM纤维能显著提高EPS轻型混凝土的抗拉强度,水胶比对EPS轻型混凝土力学性能影响最小;当EPS掺量为35%(体积分数)、POM纤维掺量为0.9%(质量分数)、水胶比为0.21时,EPS轻型混凝土的力学性能最优;在冻融循环下,EPS轻型混凝土冻融损伤满足二参数Weibull分布模型,该模型能较好地反映EPS轻型混凝土冻融损伤变化规律。

关键词: EPS轻型混凝土, 正交试验, AHP-CRITIC混合加权法, 抗冻性能, 导热系数, 冻融损伤模型

Abstract: Insulation property and frost resistance have an important impact on measuring the durability of functional integrated materials and improving green energy conservation and emission reduction. Using orthogonal test, expanded polystyrene (EPS) content, water-binder ratio, polyoxymethylene (POM) fiber content were used as the influencing factors, and the mechanical properties, insulation property and frost resistance of EPS lightweight concrete were tested. The test results were analyzed to obtain the EPS lightweight concrete foundation mix ratio with the best comprehensive performance by range analysis and AHP-CRITIC hybrid weighting analysis. The results show that EPS content has the greatest influence on the mechanical properties of EPS lightweight concrete, POM fiber can significantly increase the tensile strength of EPS lightweight concrete, and water-binder ratio has the least influence on the mechanical properties of EPS lightweight concrete. When the volume fraction of EPS is 35%, the mass fraction of POM fiber is 0.9%, and the water-binder ratio is 0.21, the mechanical properties of EPS lightweight concrete are the best. Under freeze-thaw cycles, the freeze-thaw damage of EPS lightweight concrete satisfies two-parameter Weibull distribution model, which can better reflect the change rule of freeze-thaw damage.

Key words: EPS lightweight concrete, orthogonal test, AHP-CRITIC hybrid weighting method, frost resistance, thermal conductivity, freeze-thaw damage model

中图分类号:

TU528

曹军平, 朱健, 高镇. 基于正交试验的EPS轻型混凝土配合比设计及性能研究[J]. 硅酸盐通报, 2023, 42(4): 1270-1281.

CAO Junping, ZHU Jian, GAO Zhen. Mix Proportion Design and Properties Study of EPS Lightweight Concrete Based on Orthogonal Test[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1270-1281.

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