基于高岭土增韧环氧树脂水泥基材料的多强度组合指标配比优化法

Multi-strength combination index optimization method based onkaolin toughened epoxy resin cement-based materials

煅烧高岭土能有效改善环氧树脂水泥基材料的力学性能,实验表明:煅烧高岭土可大大提高环氧树脂水泥基材料的3 d早期抗折、抗压强度,当高岭土掺量为30%时,改性环氧树脂水泥基材料的抗折及抗压强度分别提高了134.28%、106.25%;当高岭土掺量小于30%时,改性环氧树脂水泥基材料具有二次抗折强度,且抗折强度残余率大于50%。根据不同高岭土掺量对改性环氧树脂水泥基材料抗压强度、抗折强度、二次抗折强度的影响规律,提出了适用于不同结构工程受力特点的多强度组合指标配比优化法,获得了考虑二次抗拉强度影响的不同最大拉应力和最大压应力组合条件下最优的高岭土配比,为实际不同结构体不同部位不同受力特征的高岭土改性环氧树脂水泥基材料制备提供了理论依据。

Calcined kaolin can effectively improve the mechanical properties of epoxy resin cement-based materials.Experiments show that calcined kaolin can greatly improve the early flexural and compressive strength of epoxy resin cement-based materials,when the kaolin content is 30%,the flexural and compressive strength of modified epoxy resin cement-based materials are increased by 134.28%and 106.25%,respectively.When the kaolin content is less than 30%,the modified epoxy resin cement-based material has secondary flexural strength,and the residual rate of flexural strength is greater than 50%.According to the influence of different kaolin content on compressive strength,flexural strength and secondary flexural strength of modified epoxy resin cementitious materials,a multi-strength combination index ratio optimization method suitable for different stress characteristics of structural engineering was proposed,and the optimal kaolin ratio under different maximum tensile stress and maximum compressive stress combination conditions considering the influence of secondary tensile strength was obtained,which provided a theoretical basis for the preparation of kaolin modified epoxy resin cementitious materials with different stress characteristics in different parts of different structures.