不同水胶比对玻化微珠保温砂浆性能的影响

发布时间：2018-12-19 09:19

【摘要】：研究了当水胶比分别为1.2,1.3,1.4和1.5时,玻化微珠保温砂浆的干燥收缩、抗压强度、抗折强度、干密度、导热系数等性能指标.通过压汞试验和SEM扫描电镜分析,从微观角度进一步揭示了玻化微珠保温砂浆的性能指标随水胶比变化的原因.试验结果表明:玻化微珠保温砂浆的干燥收缩随着水胶比的增大呈现明显增大的趋势;当水胶比一定时,玻化微珠保温砂浆的干燥收缩早期增长速率较快,后期增长速率较慢;当水胶比分别为1.3,1.4和1.5时,玻化微珠保温砂浆的抗压强度、抗折强度、干密度、导热系数与水胶比为1.2时相比均有了较为明显的变化,抗压强度分别下降了13.1%,40.0%和73.8%;抗折强度分别下降了18.8%,35.7%和77.7%;干密度分别减小了8.3%,19.4%和33.3%;导热系数也分别下降了4.6%,11.3%和21.4%.玻化微珠保温砂浆的各项性能随着水胶比的变化,产生了明显的变化.通过压汞试验和SEM分析发现,随着水胶比的增大,玻化微珠保温砂浆内部孔隙增多.
[Abstract]:The drying shrinkage, compressive strength, flexural strength, dry density and thermal conductivity of vitrified microbead insulation mortar were studied when the water-binder ratio was 1.2 ~ 1.3N 1.4 and 1.5, respectively. By means of mercury injection test and SEM scanning electron microscope analysis, the reasons for the change of properties of glass microbead insulation mortar with water / binder ratio were further revealed from the microcosmic point of view. The results show that the drying shrinkage of glass microbead insulation mortar increases obviously with the increase of water-binder ratio, and when the water-binder ratio is fixed, the drying shrinkage rate of glass microbead insulation mortar increases faster at the early stage and slower at the later stage. When the water / binder ratio is 1.3N 1.4 and 1.5, the compressive strength, flexural strength, dry density, thermal conductivity and thermal conductivity of glass microbead insulation mortar have obvious changes compared with those of water-binder ratio 1.2, respectively. The compressive strength decreased by 13.1% and 73.8%, respectively. The flexural strength decreased by 18.8% and 77.7%, the dry density decreased by 8.3% and 33.3%, and the thermal conductivity decreased by 4.6% and 21.4%, respectively. The properties of glass microbead insulation mortar changed obviously with the change of water / binder ratio. Through mercury injection test and SEM analysis, it was found that the internal porosity of glass microbead insulation mortar increased with the increase of water-binder ratio.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51278180)~~
【分类号】：TU551;TU578.1

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