基于紧密堆积理论的环氧混凝土配合比设计  

Mix Proportion Design of Epoxy Concrete Based on Close Packing Theory

作　　者：单俊鸿[1] 张凯[1,2] 王稷良 SHAN Junhong;ZHANG Kai;WANG Jiliang(School of Civil Engineering,Hebei University of Engineering,Handan,Hebei 056038,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038 [2]交通运输部公路科学研究院,北京100088

出　　处：《河北工程大学学报（自然科学版）》2022年第2期39-44,共6页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：中央级公益性科研院所基本科研业务费专项资金资助项目(2018-9003);内蒙古自治区交通科技项目(NJ-2019-09)。

摘　　要：基于紧密堆积理论,采用MAA模型和Fuller最大密度理论选出了砂石骨料的最优级配,应用正交试验方法确定了环氧混凝土的最佳配合比,并进行了力学性能评价和微观分析。结果表明:砂石骨料经级配优化后,紧密堆积空隙率明显降低,最紧密堆积空隙率仅为22.23%。骨胶比对环氧混凝土劈裂抗拉强度具有显著性影响,水泥适合作为填料掺入环氧混凝土中。环氧混凝土的立方体抗压强度随龄期的增长而略有增长,且与环氧树脂的固化程度紧密相关,当环氧树脂完全固化时,环氧混凝土的立方体抗压强度基本不再随龄期而变化。经级配优化后,环氧混凝土的力学性能得到改善,立方体抗压强度有所提高。通过SEM微观测试分析发现,级配优化后的环氧混凝土内部有害缺陷明显减少,体系密实均匀,内部黏结力更强。Based on the close packing theory,the MAA model and Fuller maximum density theory were used to select the optimal gradation of aggregate.The orthogonal test method was used to determine the optimal mix ratio of epoxy concrete,and the mechanical properties evaluation and microscopic analysis were carried out.The results show that the close packing porosity of aggregate is significantly reduced after gradation optimization,and the most closely packed porosity is only 22.23%.The bone-binder ratio has a significant influence on the splitting tensile strength of epoxy concrete,and cement is suitable for incorporation into epoxy concrete as a filler.The cube compressive strength of epoxy concrete increases slightly with the increase of age,and is closely related to the curing degree of epoxy resin.When the epoxy resin is completely cured,the cube compressive strength basically does not change with the age.The mechanical properties of epoxy concrete after gradation optimization are improved,the cube compressive strength is increased.Through SEM microscopic test analysis,it is found that the internal harmful defects of epoxy concrete after gradation optimization are significantly reduced,the system is dense and uniform,and the internal bonding force becomes stronger.

关 键 词：紧密堆积理论 环氧混凝土 骨料空隙率 正交试验 级配 

分 类 号：TU528.41[建筑科学—建筑技术科学]