双掺合料高性能混凝土在公路路面应用研究

Application of high performance concrete with double admixtures in pavement of highway

在前期试验研究工作基础上,选择一试验段公路路面应用粉煤灰、珍珠岩粉双掺合料等量替代24%水泥、掺适量高效减水剂以配制高抗折强度和高耐久性的混凝土。经工地试件和取芯样检测力学强度、电通量和氯离子扩散系数等指标表明:该路面混凝土满足重交通等级道路(设计抗弯拉强度≥5.0)的技术要求,混凝土抗氯离子渗透性能较好或非常好,可满足在中、强或弱氯盐环境下钢筋混凝土结构设计使用100年。

Based on former experimental achievement, the construction and application of high performance concrete （HPC） in pavement of highway were expounded.The HPC was mixed with double admixtures replacing 24% cement in equal mass, including 12% fly ash and 12% perlite powder.It indicated that, by inspected result of HPC samples from situ and drilling on pavement, flexural strength of these concrete are larger than 5 MPa and enough to the technical specification of heavy traffic grade, and the HPC also features better permeability resistance of chloride ion, which can be used in environment of chloride salt for 100 years.