低品质活性矿物掺合料透水混凝土试验研究  

Experimental research on pervious concrete mixed with low-quality active mineral admixture

作　　者：高润东[1,2] 许清风[1,2] 李向民[1,2] 贡春成[1,2] 

机构地区：[1]上海市工程结构安全重点实验室,上海200032 [2]上海市建筑科学研究院,上海200032

出　　处：《混凝土》2015年第6期103-105,109,共4页Concrete

基　　金：上海市科学技术委员会青年科技启明星资助项目(13QB1403100)

摘　　要：通过试验研究了低品质活性矿物掺合料透水混凝土的基本性能,包括单掺低品质硅灰、单掺低品质粉煤灰、双掺低品质硅灰和粉煤灰。宏观上测试了抗压强度、抗折强度、孔隙率和透水系数;微观上用SEM观测了胶结层的微观结构、用EDS观测了胶结层的化学组成。试验结果表明:在普通透水混凝土中掺入一定量的低品质活性矿物掺合料替代部分水泥是可行的;单掺低品质硅灰效果最佳、掺量可在6%左右单掺低品质粉煤灰次之、掺量可在15%左右;单掺低品质硅灰透水混凝土和单掺低品质粉煤灰透水混凝土强度等级为C15左右,孔隙率均不低于20%,透水系数均不低于20×10^(-2)cm/s,可以满足一般轻交通路面的应用条件。Performance tests were conducted on pervious concrete mixed with low-quality active mineral admixture,including adding single low- quality silica fume,adding single low- quality fly ash,and adding both low- quality silica fume and low- quality fly ash.Macro- observations involve compressive strength flexural strength,porosity and permeability coefficient.Micro- observations involve microstructure of cemented layer by SEM and chemical composition of cemented layer by EDS.Results indicate mixed with a certain amount of low- quality active mineral admixture in place of cement in ordinary pervious concrete is feasible.Adding single low- quality silica fume with mass fraction of about 6%works best followed by adding single low- quality fly ash with mass fraction of about 15%.Whether adding single low-quality silica fume or adding single low- quality fly ash,the strength class of concrete is about C15,the porosity is not less than 20%,and the permeability coefficient is not less than 20 × 10-2 cm/s,which meet with application conditions of ordinary light traffic pavements.

关 键 词：透水混凝土 低品质活性矿物掺合料 强度 孔隙率 透水系数 

分 类 号：TU528.2[建筑科学—建筑技术科学]