不同体积掺量的SiO2气凝胶对砂浆性能的影响

Effect on the performance of mortar using different volume content of SiO_2 aerogel

以低导热系数的SiO_2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SiO_2气凝胶砂浆,主要研究当SiO_2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)。

Using a low thermal conductivity of SiO_2 aerogel particles as insulation aggregate,the equal volume SiO_2 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 SiO_2 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 conductivity is the lowest(0.0859 W/(m·K)).