适用于装配式电力工程结构的环氧黏接砂浆改性研究

Study on modification of epoxy mortar for assembly power engineering structures

为探究适用于装配式电力工程结构黏接材料的环氧砂浆配合比及其性能,基于正交试验法对不同配比的环氧砂浆力学性能进行测试,采用极差值分析各组分掺量对环氧砂浆1 d抗压、抗折、黏接强度的影响,并选取代表样进行X射线衍射(XRD)与压汞测试(MIP)。结果表明:环氧树脂可有效固化水泥熟料并影响水泥水化进程,同时改变砂浆内部孔隙结构;稀释剂掺量对环氧砂浆力学性能的影响程度最大;水泥与砂的质量比(灰砂比)的增加将阻碍环氧树脂的胶结作用从而影响环氧砂浆的黏接强度;增加固化剂掺量将降低环氧砂浆的韧性。基于正交分析,确定了填料与液料比(F/L)2∶1、固化剂掺量100%(占环氧树脂的量)、灰砂比(C/S)2∶1、稀释剂掺量10%的最优复合环氧砂浆配合比。

To explore the ratio and properties of epoxy mortar that is used as bonding material for assembly power engineering construction, mechanical properties of epoxy resin mortar with different proportions are tested based on orthogonal method. The influences of each factor on the compressive strength, flexural strength and bond strength of epoxy resin mortar after 1 d are analyzed by extremum difference analysis, then the characteristic specimens are selected for X-ray diffraction(XRD) and mercury intrusion porosimetry(MIP). The results indicate that epoxy resin can effectively solidify cement clinker and affect its hydration process, as well as change the pore type in mortar;the diluents have the highest influence on the mechanical properties of the epoxy mortar;the mass ratio of cement to sand(C/S) mainly affects the bond strength of the epoxy mortar;the increasing curing agent content would reduce the toughness of mortar. Based on the orthogonal analysis, the optimum proportion of the epoxy mortar is determined, which included a ratio of filler to liquids( F/L) of 2∶1, a curing agent dose of 100%(referenced by the mass of epoxy resin), a C/S of 2∶1 and a diluent dose of 10%.