基于工作性的混凝土配合比设计方法及应用  

Research on mix proportion design of concrete based on workability

作　　者：韩小华 HAN Xiaohua(Beijing Tiejian Yongtai New Building Materials Co.,Ltd.,Beijing 101104,China)

机构地区：[1]北京铁建永泰新型建材有限公司,北京101104

出　　处：《混凝土》2022年第2期60-66,70,共8页Concrete

摘　　要：满足结构设计的强度与耐久性要求的混凝土拌合物,其硬化混凝土的质量取决于新拌混凝土的工作性。不能满足工作性要求的混凝土拌合物,难以实现硬后化混凝土的强度与耐久性要求。有必要在混凝土拌合物配合比设计中进行以拌合物工作性为目标的设计,取代传统上按经验进行用水量和砂率调整的方法。为此,以新拌混凝土流变学理论为指导,建立混凝土拌合物3个结构层次的粗悬浮体模型,确定基于新拌混凝土工作性的配合比设计3个参数:水胶比(W/B)、砂浆中浆体富余系数(V_(p)/V_(os))、混凝土中砂浆富余系数(V_(m)/V_(og))。通过对实际使用过的混凝土配合比数据分析和试验验证,确定这些参数与拌合物工作性之间的关系,在满足强度和耐久性设计要求的前提下,提出基于新拌混凝土工作性要求的配合比设计方法。Once required strength and durability of hardened concrete are determined,the workability of fresh concrete is the key to quality of hardened concrete in structure component.Instead of conventional readjusting by empirical method,a model of suspension with coarse particles for fresh concrete with superplasticizer is established based upon the theory of theology.Three factors for mix proportion design of concrete mixture based on the workability of fresh concrete are indentified.They are the water/binder(W/B),the surplus coefficient of paste(V_(p)/V_(os))and the surplus coefficient of mortar(V_(m)/V_(og)).The relation between mortar and concrete on workability and factors were studied with a lot of mix proportions used in construction projects and additional tests are added,and a method for mix proportion design of concrete mixture based on workability requirement of fresh concrete is established on the premise of meeting the design requirements of strength and durability.

关 键 词：拌合物配合比设计 新拌混凝土工作性 浆体富余系数 砂浆富余系数 

分 类 号：TU528.062[建筑科学—建筑技术科学]