自密实高性能混凝土配合比优化设计及计算探讨  

Optimization design and calculation of self compacting high performance concrete mix proportion

作　　者：马庆华[1] 程刚[2] 马慧娟 

机构地区：[1]连云港职业技术学院建筑工程学院,江苏连云港222006 [2]安徽理工大学土木建筑学院,安徽淮南232001 [3]贵州顺康路桥咨询有限公司,贵州贵阳550000

出　　处：《混凝土》2017年第10期131-134,共4页Concrete

基　　金：2016年江苏省省级新型墙体材料专项基金项目

摘　　要：应用全计算方法,以粉煤灰、磨细钢渣粉、矿渣微粉、硅灰作为掺合料,进行混凝土配合比设计,通过全计算方法的系数、分别修正用水量和砂率,降低砂率和胶凝材料总量。与原全计算方法相比较,通过修改的全计算方法获得的取值在0.84~0.88范围内;当掺F-2型复合掺合料时,取值范围为0.91~0.93;掺F-1型和掺F-2型的复合掺合料时的砂率相差较小。采用优化后的配合比配制的C45混凝土的电通量小幅下降,在砂率和胶凝材料总量降低后,提高了混凝土抗渗透性能。结合工程实例,对计算后的配合比进行调整,结果表明工程实体在浇筑过程中,混凝土具有良好的上翻效果,中间无振捣,且一次成型。在待料期间,自密实混凝土坍落度损失变化较小,其流动性与和易性均满足指标要求。It used the whole calculation method, using fly ash and steel slag powder, slag powder and silica fume as admixture of con- crete mix design,water and sand ratio were modified by coefficient, calculation method of, the lower the rate of sand and total cementitious materials.Compared with the original calculation method, obtained by the whole calculation method to modify the value ofin the range of 0.84-0.88.When the dosage of F-2 composite admixture, the value range of is 0.91-0.93 ; composite doped F-1 and F-2 doped type mixture when the sand ratio is smaller.The electric flux of C45 concrete prepared by the optimized proportion decreased slightly, and thepermeabil- ity of concrete was improved after the sand ratio and the total amount of cementitious material decreased.Combined with the engineering example, the calculation of the proportion of the adjustment, the results show that the engineering entity in the pouring process, the con- crete has a good effect of turning, no vibration in the middle, and a molding.During the course of material feeding, the slump loss of the self compacting concrete changes little, and the fluidity and workability of the compacted concrete meet the requirements of the index.

关 键 词：配合比 优化设计 自密实 混凝土 

分 类 号：TU528.062[建筑科学—建筑技术科学]