环氧砂浆力学性能及黏结耐久性试验

Mechanical properties and bonding durability of epoxy mortar

为对比环氧砂浆和水泥砂浆力学性能及黏结性能,以抗压强度、抗折强度和黏结强度为考核指标,分别制作对应试件进行冻融循环试验。试验结果表明:经过300次冻融循环后,环氧砂浆试件外观形态基本无变化,抗压强度和抗折强度分别降低55.8%、56.7%,而水泥砂浆试件力学性能几乎丧失;在冻融循环过程中,水泥砂浆黏结试件由内聚破坏转为界面破坏,当冻融循环18次时,水泥砂浆黏结试件黏结强度降为0 MPa,而环氧黏结试件黏结强度降低49.7%,说明环氧砂浆具有更加优异的耐冻融性能。

In order to compare the mechanical properties and bonding properties of epoxy mortar and cement mortar,freeze-thaw cycling tests were carried out on the corresponding specimens,taking compressive strength,flexural strength and bonding strength as evaluation indexes.The test results show that after 300 freeze-thaw cycles,the appearance of epoxy mortar specimens is basically unchanged,the compressive strength and flexural strength are reduced by 55.8% and 56.7%,respectively,while the mechanical properties of cement mortar specimens are almost lost.During freeze-thaw cycles,the cohesive failure of cement mortar bond specimens is changed to the interfacial failure.When the freeze-thaw cycles are 18 times,the bond strength of cement mortar bond specimens is reduced by 55.8% and 56.7%.The strength of epoxy mortar decreases to 0 MPa,while that of epoxy mortar decreases to 49.7%,which indicates that epoxy mortar has better freeze-thaw resistance.