不同腐蚀条件下活性粉末混凝土的抗弯性能  

Bending Properties of Reactive Powder Concrete under Different Corrosion Conditions

作　　者：贺奎[1] 王万金[1] 贾方方[1] 路振宝[1] 刘俊元[1] 孔德成 

机构地区：[1]北京市功能性高分子建筑材料工程技术研究中心、北京市建筑工程研究院有限责任公司,100039 [2]北京交通职业技术学院,102200

出　　处：《混凝土与水泥制品》2016年第2期15-17,共3页China Concrete and Cement Products

基　　金：北京市百千万人才资助项目;北京市博士后基金资助项目(2014ZZ-41)

摘　　要：采用四点弯曲试验研究了不同腐蚀条件下钢纤维活性粉末混凝土的抗弯性能。结果显示,氯盐-冻融循环耦合作用对试件的抗弯强度腐蚀作用大于冻融循环单因素的腐蚀,氯盐-冻融耦合循环1500次后,试件的抗弯强度仅为标准养护的45.02%。由于活性粉末混凝土基体致密,腐蚀作用下,试件表面钢纤维锈蚀,但内部钢纤维仍能起到很好的限裂作用,基体开裂后仍能保持较好的持荷能力,抗弯试件的相对剩余强度都能达到80%以上。Bending properties of steel fiber reactive powder concrete under different corrosion conditions were studied by four-point bending test. Experimental results show that the corrosion of chloride salt coupling freeze-thaw cycles is greater than the freeze-thaw cycles. After 1500 times chloride salt coupling freeze- thaw cycles, bending strength of the specimens was only about 45.02% of the standard curing. Because of the compactness of reactive powder concrete, external steel fiber corrosion but the internal steel fiber can still restrict the development of cracks. Therefore, the relative residual strength of the bending specimen can keep over 80%, which shows that it has good load capacity after the matrix cracking.

关 键 词：活性粉末混凝土 抗弯性能 盐侵蚀 冻融循环 耦合 

分 类 号：TU528.01[建筑科学—建筑技术科学]