双掺矿物掺合料高性能混凝土的强度与收缩试验研究  

Study on strength and shrinkage of high performance concrete with compound mineral admixtures

作　　者：赵素梅[1] 贡金鑫[1] 

机构地区：[1]大连理工大学建设工程学部土木工程系,辽宁大连116024

出　　处：《混凝土》2016年第2期81-86,89,共7页Concrete

基　　金：国家基础研究项目(973项目:2015CB057703)

摘　　要：对双掺粉煤灰和矿渣的高性能混凝土进行了强度和收缩试验,分析了粉煤灰和矿渣双掺比例(1∶2、2∶3、1∶1)及双掺总量(30%、40%、50%)的影响。研究表明,在双掺比例相同的条件下,随着双掺总量的增加,高性能混凝土强度降低,总收缩和干缩降低,自收缩增加;在双掺总量相同的条件下,随着双掺比例的增加,高性能混凝土早期强度降低,后期强度增加、总收缩降低、自收缩减少和干缩增加。在双掺情况下,单独增加粉煤灰或矿渣的掺量,粉煤灰降低早期强度和总收缩的效果更明显,但矿渣引起自收缩增大的幅度大于粉煤灰引起自收缩减小的幅度;相比于粉煤灰,矿渣降低干缩的效果更明显;矿渣增大自收缩的幅度远小于其降低干缩的幅度。通过回归分析得到了双掺高性能混凝土的收缩计算式。Experiments were made on the strength and shrinkage properties of high performance concrete with fly ash（FA） and ground granulated blast furnace slag （ GGBFS ）, including the effect of the ratio of FA to GGBFS （ 1 ： 2,2：3,1 ： 1 ） and the amount of FA and GG- BFS （30% ,40% ,50% ）. The results show that in the case of identical ratio of FA to GGBFS, the strength of the concrete decreases with the increase of the amount of the compound mineral admixtures, while the total shrinkage strain and the drying shrinkage strain reduces and the autogenous shrinkage strain increases.In the case of identical amount of the compound mineral admixtures, the strength of con- crete decreases at early age and increases later with the increase of ratio of FA to GGBFS ,while total shrinkage strain and autogenous shrinkage strain decreases and drying shrinkage strain increases.For the compound mineral admixtures, the strength and total shrinkage strain of concrete decrease at early age with the increase of amount of FA or GGBFS.Contrast to GGBFS ,the influence of FA is greater than GGBFS. GGBFS is more marked for increasing of autogenous shrinkage than FA for decreasing autogenous shrinkage. The drying shrinkage strain of concrete decrease with the increase of amount of FA or GGBFS.Contrast to FA ,the influence of GGBFS is greater than FA.GGBFS is more marked for decreasing drying shrinkage than GGBFS for increasing of autogenous shrinkage. Expressions for predicating the total shrinkage strain, and the autogenous shrinkage strain are proposed.

关 键 词：高性能混凝土 强度 总收缩 自收缩 双掺矿物掺合料 

分 类 号：TU528.041[建筑科学—建筑技术科学]