胶砂比改性的高分子材料对古建筑修复的影响及性能研究

Study on the effect and performance of polymer materials modified by cement sand ratio on the restoration of ancient buildings

为了修复古建筑材料因病害造成的破坏,试验制备了3种硅烷偶联剂石灰类改性修复材料,并研究其性能。试验结果表明,减小胶砂比可以降低质量损失率,同时提升材料的抗压、抗折强度,最佳胶砂比为1∶3;对于不同掺量硅烷试件,长链硅烷的抗折强度较好,防水性较高,耐水性、耐久性良好;因此,最优硅烷偶联剂为辛基三乙氧基硅烷,最佳硅烷掺量为1%,此时,抗折强度为2.11 MPa,抗压强度为21.43 MPa,接触角为108.26°,软化系数为0.85,硫酸盐试验后质量变化率为0.81%,材料综合性能良好。

In order to repair the damage caused by diseases of ancient building materials,three silane coupling agent lime modified repair materials were prepared and their properties were studied in this experiment.The test results showed that reducing the cement sand ratio could reduce the mass loss rate,and improve the compressive and flexural strength of the material.The optimal cement sand ratio was 1∶3;For specimens with different amounts of silane,long chain silane had good flexural strength,high water resistance,good water resistance,and good durability;Therefore,the optimal silane coupling agent was octyltriethoxysilane,and the optimal silane content was 1%.At this time,the flexural strength is 2.11MPa,the compressive strength was 21.43 MPa,the contact angle was 108.26°,the softening coefficient was 0.85,and the mass change rate after the sulfate test was 0.81%.The comprehensive performance of the material was good.