西南科技大学学报
西南科技大學學報
서남과기대학학보
JOURNAL OF SOUTHWEST CHINA INSTITUTE OF TECHNOLOGY
2012年
1期
37-39,47
,共4页
混凝土%高强混凝土%干缩%自收缩
混凝土%高彊混凝土%榦縮%自收縮
혼응토%고강혼응토%간축%자수축
Concrete%High strength concrete%Drying shrinkage%Self desiccation
设计6种不同配合比及3种养护条件实验研究了水灰比、矿物掺合料和养护条件对混凝土干缩及自收缩性能的影响。结果表明,混凝土的自收缩率随水灰比（w/c）降低而提高,当w/c由0.50降低到0.23时,90 d自收缩率由64×10-6提高到441×10-6,提高了近7倍,显示出高强混凝土具有显著的自收缩特点。掺入硅灰将增大高强混凝土的自收缩率,密封养护和暴露养护时高强混凝土收缩率无明显区别。从整体干缩性能看,高强混凝土和普通混凝土之间无明显差别。
設計6種不同配閤比及3種養護條件實驗研究瞭水灰比、礦物摻閤料和養護條件對混凝土榦縮及自收縮性能的影響。結果錶明,混凝土的自收縮率隨水灰比（w/c）降低而提高,噹w/c由0.50降低到0.23時,90 d自收縮率由64×10-6提高到441×10-6,提高瞭近7倍,顯示齣高彊混凝土具有顯著的自收縮特點。摻入硅灰將增大高彊混凝土的自收縮率,密封養護和暴露養護時高彊混凝土收縮率無明顯區彆。從整體榦縮性能看,高彊混凝土和普通混凝土之間無明顯差彆。
설계6충불동배합비급3충양호조건실험연구료수회비、광물참합료화양호조건대혼응토간축급자수축성능적영향。결과표명,혼응토적자수축솔수수회비（w/c）강저이제고,당w/c유0.50강저도0.23시,90 d자수축솔유64×10-6제고도441×10-6,제고료근7배,현시출고강혼응토구유현저적자수축특점。참입규회장증대고강혼응토적자수축솔,밀봉양호화폭로양호시고강혼응토수축솔무명현구별。종정체간축성능간,고강혼응토화보통혼응토지간무명현차별。
An experiment was undertaken to study the drying shrinkage and self desiccation of concrete.The test results show that the self desiccation of concrete increases as water to cement ratio decreases.The 90 d self desiccation increases from 64×10-6 to 441×10-6 when the w/c decreases form 0.50 to 0.23 due to the consume of water caused by the cement hydration.Incorporation of silica fume increases the self shrinkage of high strength concrete.However the drying shrinkage of high strength conctete is similar to the normal strength concrete.
