裂纹对PHC管桩抗氯离子性能影响的研究  

Study on the influence of crack on the resistance to chloride ion performances of PHC pile

作　　者：胡贺松 杨医博[2,3] 李应 唐孟雄 艾立涛 郭文瑛[2] 王恒昌[2] 

机构地区：[1]广州市建筑科学研究院有限公司,广东广州510440 [2]华南理工大学土木与交通学院,广东广州510640 [3]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [4]珠海市兆丰混凝土有限公司,广东珠海519120

出　　处：《混凝土》2013年第12期131-134,共4页Concrete

基　　金：广东省教育部产学研结合项目(2010B090400490);广东省科技计划项目(2010B031900029);广州市科技计划项目(2010Y1-C601;2013J2200076)

摘　　要：PHC管桩是工程中重要的桩基材料,然而其在生产和施工过程中却不可避免的会产生微裂纹。通过对管桩混凝土试件施加不同水平应力的方法模拟裂纹,并将其分别在空气、自来水和盐水等三种方式下养护,探讨裂纹对管桩混凝土抗氯离子性能的影响。研究结果显示,在三种养护条件下,随着压应力水平的增加,混凝土的电量值均有增加的趋势;为避免氯盐环境下可能的耐久性问题,管桩混凝土应选用较高的质量指标,施工前电量值宜取不大于800C,施工后电量值宜取不大于1 000 C。The PHC pile is the important pile foundation material in the project, however the pile will be inevitable have tiny crack in the process of production and construction.Studies the impact of cracks on the resistance to chloride ion performance of pile concrete.The crack imitated by apply different levels of stress in the pile concrete, and put the concrete into the air, tap water and saline water curing en- vironment for 7 day and 28 day.The results show that with the increase of the compressive stress level, the value of electricity has an in- creasing trend in the three kinds of environment;In order to avoid possible durability issues in the chloride environment, the pile concrete should be selected higher quality index, it is recommended that the value of electricity of PHC pile is less than 800C before the construc- tion, and less than 1 000 C after the construction.

关 键 词：管桩 混凝土 裂纹 抗氯离子性能 

分 类 号：TU528.73[建筑科学—建筑技术科学]