不同体积掺量的SiO2气凝胶对砂浆性能的影响

摘要

Using a low thermal conductivity of SiO2 aerogel particles as insulation aggregate,the equal volume SiO2 aerogel particles was adopted to replace sand in mortar to prepare thermal insulation mortar.The density, mechanical properties,water absorption,the thermal conductivity and other performance were studied when the SiO2 aerogel particles replacement ratio was 10%,20%,30%,40%,50% and 60%.And on this basis,the thermal conductivity was focused on study when fiber,air-entraining agent and powder were added into the mortar.The results show that when the dosage was 0.2%,0.05% and 1% respectively,the thermal conductivi-ty is the lowest (0.0859 W/(m•K)).%以低导热系数的SiO2气凝胶颗粒为保温骨料,采用等体积替换法替换砂浆中的沙制备 SiO2气凝胶砂浆,主要研究当SiO2气凝胶颗粒的替换比例分别在10％,20％,30％,40％,50％和60％时,对砂浆的密度、力学性能、吸水率以及导热系数等性能的影响,并在此基础上,通过添加纤维、引气剂和胶粉来对砂浆做改性,重点研究了各掺量对砂浆导热系数的影响,结果表明,当其掺量分别为0．2％,0．05％和1％时,导热系数达到最低为λ＝0．0859 W/(m•K)。