再生混凝土极限黏结强度及钢筋锚固长度取值研究  

STUDY ON ULTIMATE BOND STRENGTH AND ANCHORAGE LENGTH OF THE REBAR IN THE RECYCLED AGGREGATE CONCRETE

作　　者：王博[1] 白国良[1] 吴淑海[2] 冯向东 李坚 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]中冶南方工程技术有限公司,武汉430223 [3]深圳市建工集团股份有限公司,广东深圳518048

出　　处：《工业建筑》2013年第8期59-63,38,共6页Industrial Construction

基　　金：国家科技支撑计划项目(2008BAK48B05);陕西省自然科学基础研究计划重点项目(2009JZ012);陕西省教育厅科研专项(11JK0949)

摘　　要：通过再生混凝土拉拔试验,分析再生骨料取代率、钢筋类型、再生混凝土强度等级对极限黏结强度的影响,回归得出包含再生骨料取代率因子的极限黏结强度表达式,分析表明:计算值与试验结果吻合较好。对比分析不同研究单位对再生混凝土极限黏结强度的影响结果,认为不宜将再生骨料取代率作为探讨再生骨料对黏结性能影响的唯一因素,尚需考虑再生骨料材性差异以及天然骨料与再生骨料间的骨料耦合效应,并定义了极限黏结强度增大系数。分析表明:钢筋类型对极限黏结强度的影响最大,钢筋直径的影响次之,混凝土强度等级的影响较小,普通混凝土的极限黏结强度普遍稍大于再生骨料取代率为100%时的极限黏结强度。最后,初步给出钢筋锚固长度的建议取值方法。According to the pull out test,this paper analyzed the influence factors which include the recycled aggregate replacement ratio,type of the rebar and strength grade of recycled concrete on ultimate bond strength and gave the formula to calculate the ultimate bond strength.Analysis shows that the calculated values agree well with the experimental results.The different research results for the influence of the recycled aggregate replacement ratio on the ultimate bond strength were analyzed comparatively,and the analysis shows that the recycled aggregate replacement ratio cannot be used as the only influence factor to analyze the influence on bond performance of the recycled aggregate and also need to consider the material performance of the recycled aggregate and the coupling effects between the recycled aggregate and the coarse aggregate.The increasing coefficient of ultimate bond strength was defined,and analysis shows that influence level of the rebar type is greatest,followed by diameter of the rebar,the influence level of the strength grade is least,and the ultimate bond strength of ordinary concrete is generally slightly larger than the recycled concrete when the recycled aggregate replacement rate is 100%.Finally,the suggested method which can determine the anchorage length was proposed.

关 键 词：再生混凝土 极限黏结强度 锚固长度 拉拔试验 

分 类 号：TU528[建筑科学—建筑技术科学]