海砂混凝土及其耐久性保护  

DURABILITY PROTECTION OF SAND CONCRETE

作　　者：施养杭[1] 王丹芳[1] 吴泽进[1] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021

出　　处：《工程力学》2010年第A02期212-216,共5页Engineering Mechanics

基　　金：住宅与城乡建设部研究与开发重点项目(2009-K2-37);福建省泉州市科技计划重点项目(2009Z46)

摘　　要：根据海砂的主要成分和特征,针对海砂在土木工程中的使用现状,通过对钢筋锈蚀机理分析,揭示海砂对混凝土结构耐久性的不良影响。阐述"海砂屋"关于耐久寿命的潜在危险,剖析因海砂中的海盐引起钢筋锈蚀的工程事例和教训,重点提出对于海砂混凝土防止钢筋锈蚀的关键技术;对比阴极保护系统和电化学除氯法的原理及具体做法,提出在海砂混凝土工程中抑制钢筋锈蚀的主要办法。根据现行国家规范对混凝土结构耐久性设计的实际要求,指出混凝土所用海砂的氯盐限量;并针对海砂对混凝土结构耐久性的危害提出若干防治措施。The bad effect of sea sand to durability of a concrete structure is investigated,on the basis of the main ingredient and features of sea sand and its application status,by the analysis of the corrosion mechanism of steels.Based on the potential danger of durable life of houses with sea sand,and combined with the engineering experiences and lessons of reinforcing bar corrosion caused by sea salt,the paper focuses on the critical technique about reinforcing bar corrosion protection of sand concrete and puts forward a key method to prevent it by contrasting the principle and application of a cathode protection system and chlorine exclusion by electrochemistry.According to the actual demands about the durability of a concrete structure in the ＂Chinese Code for design of concrete structures＂,the paper points out the prescribed limits in chlorate of sea sand and puts up some preventive measures on damage to the durability of the concrete structure caused by sea sand.

关 键 词：海砂氯离子 钢筋锈蚀 混凝土破坏 阴极保护 耐久性 

分 类 号：TU377[建筑科学—结构工程]