硅微粉对混凝土性能的影响  

Influence of silica powder on the properties of concrete

作　　者：雷文晗[1] 彭小芹 谢永江[2] 李化建[2] 易忠来[2] 谭盐宾[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《混凝土》2011年第6期100-101,107,共3页Concrete

基　　金：铁道部科技开发计划项目(2008G031-N2010G029-B)

摘　　要：为开发一种新型矿物掺合料,以硅微粉为研究对象,系统研究了硅微粉混凝土的力学性能、耐久性能(抗氯离子渗透性、抗冻性)及其热物理性能。研究结果表明:硅微粉与粉煤灰复掺40%时,其中硅微粉掺量在20%以内,混凝土28 d强度可以达到40 MPa以上,硅微粉的掺入可提高混凝土的抗氯离子渗透性与抗冻性能,显著降低了混凝土的早期放热峰值与水化放热速率,从而有效地降低混凝土温度开裂敏感性,因此,硅微粉是一种具有良好应用前景的新型矿物掺合料。For the development of a new type of mineral admixture,study the influences of addition of silica powder on mechanical properties,durability properties（chloride diffusivities,freezing resistance） and performance of hydration heat of concrete.Test results indicate that the 28 d compressive strength of concrete achieve above 40 MPa when 40% of the cement material is silica powder and fly ash,and the content of silica powder is not more than 20%.The chloride diffusivities,freezing resistance of concrete can be obviously improved.By adding silica powder can obviously reduce the early exothermic peak and early speed of hydration heat,so this can effectively reduce the sensitivity of concrete cracking.Therefore,silica powder is a good prospect for new mineral admixtures.

关 键 词：硅微粉 混凝土 力学性能 耐久性 水化热 

分 类 号：TU528.041[建筑科学—建筑技术科学]