（中国十七冶集团有限公司 技术中心，中国 马鞍山，243000）

[摘要]  在役RC结构中钢筋锈蚀是一个分段加速的过程，其对结构构件产生的负效应较混凝土碳化开裂更为明显，据此给出了一般大气环境下钢筋混凝土结构随内嵌钢筋锈蚀而出现性能劣化的主要服役阶段划分规则，并就内嵌纵筋未锈阶段和保护层混凝土开裂阶段RC构件服役时间的计算方法进行了探讨。通过引入混凝土碳化残量以弥补主流观点关于钢筋表面钝化膜失效时间研究的不足，并基于实测数据拟合得到一般大气环境下保护层混凝土碳化残量计算模型，提出了内嵌钢筋开始锈蚀时间的计算公式；基于弹性力学相关理论，建立了钢筋锈胀所引起的钢筋混凝土构件保护层混凝土发生开裂时钢筋锈蚀率计算模型，并揭示了诸如混凝土抗拉强度标准值、混凝土保护层厚度、铁锈泊松比、钢筋直径及铁锈锈胀率等主要影响因素对钢筋锈蚀率的影响规律，最终给出了保护层混凝土胀裂时RC构件服役时间的建议计算公式。研究成果可为在役RC结构力学性能分析提供理论参考。

[关键词]  一般大气环境；RC构件；服役时间；碳化残量；锈胀开裂

中图分类号：TU313.1; TU375      文献标识码：A           文章编号：

Study on calculating method for typical service time of RC component under common atmosphere environment

Yin Wanyun, Hu Yi

(Technology Center, China MCC17 group Co., Ltd., Maanshan 243000, China)

Abstract: Reinforcement corrosion of existing RC frame structure component is accelerated with stages, and it’s negative effects to structure component are more obviously than concrete carbonization cracking does. The classification principle for main service stages of RC structure performance degradation which caused by reinforcement corrosion in common atmosphere environment is provided, and the methods for calculating service time of RC component before reinforcement corrosion and concrete carbonization cracking are discussed in this paper. By introducing concrete carbonated residue content to make up the lack of studies on rebar surface passive film failure time, calculating formulas for defining the start time of reinforcement corrosion is proposed according to covered concrete carbonated residue content suggested calculating model which is obtained from regressive analysis of measured data. Based on the correlation theory of elasticity, model for calculating reinforcement corrosion rate when the covered concrete is beginning to crack which caused by reinforcement corrosion expansion is established, and the influence law of concrete tensile strength, concrete cover depth, rust poisson ratio, reinforcement diameter and rust corrosion expansion rate on reinforcement corrosion rate is revealed, then the suggested formulas for calculating service time of RC component before covered concrete cracking is finally obtained. The achievements will provide references to mechanics property analysis of existing RC frame structure.

Keywords: common atmosphere environment; RC component; service time; carbonated residue content; corrosion crack