水泥种类对隧道用硅气凝胶防火砂浆性能影响的试验研究  

Experimental study on the influence of cement types on properties of silica aerogel tunnel fireproof mortar

作　　者：封金财[1] 李涛[1] 朱平华[1] 孙远乾 

机构地区：[1]常州大学土木工程系,江苏常州213164

出　　处：《混凝土》2018年第1期124-127,共4页Concrete

基　　金：国家自然科学基金(51678080;51678081);江苏省产学研合作前瞻性联合研究项目(BY2015027-23);常州市社会发展项目(CE20155039)

摘　　要：为研制隧道高性能混凝土专用防火涂层砂浆,试验探讨了普通硅酸盐水泥(PO)和高贝利特水泥(HBC)对SiO_2气凝胶防火砂浆性能的影响。基于体积法设计砂浆配合比,其中气凝胶与砂的总体积固定为60%,气凝胶体积取总体积的0、20%、40%、60%、80%。结果表明:不同取代率下,PO气凝胶砂浆抗压强度、抗折强度、吸水率、分别比HBC气凝胶砂浆的对应值高12.8%、41.8%与29.8%,而软化系数与导热系数则分别低2.5%与27.9%。采用扫描电镜SEM法对两类砂浆的微观结构进行了分析,发现PO气凝胶砂浆具有更适于防火保温的微观结构。In order to develop the cement-based mortar protecting high performance concrete from spalling under tunnel fire, the influence of ordinary portland cement （PO） and high belite cement （HBC） on the SiO2 aerogel fireproof mortar performance was investigated. Using the volume method,the mortar mix proportion was designed,where the total volume of aerogel and sand was fixed to 60% ,with a varying aerogel volume ratio of 0,20%, 40%, 60% and 80%.The results indicated the PO aerogel mortar had compressive strength, flexural strength and water absorption of 12.8% ,41.8% and 29.8% higher,and softening coefficient and thermal conductivity of 2.5% and 27.9% lower than HBC aerogel mortar.Using SEM to analyse the microstructure of the two kinds of mortar finding that PO aerogel mortar possessed more suitable microstructure of fireproof thermal insulation.

关 键 词：隧道 防火砂浆 SIO2气凝胶 水泥种类 

分 类 号：TU528.01[建筑科学—建筑技术科学]