摘要
参照普通混凝土配合比设计方法配制再生粗骨料混凝土,采用相同尺寸和配筋率制作了6根再生混凝土简支梁和2根普通混凝土简支梁,进行静力加载试验。结果再生粗骨料取代率为30%时,再生混凝土梁的极限弯矩最大。用普通混凝土公式计算再生混凝土梁的开裂弯矩时,当再生粗骨料取代率大于50%时,建议修正系数取0.7;用普通混凝土公式计算再生混凝土梁正截面的极限承载力时,计算结果与试验结果符合较好。
Recycled coarse aggregate concrete is prepared based on the mix ratio design method of normal concrete. And 6 recycled aggregate concrete beams and 2 natural aggregate concrete beams with the same section size and same percentage of reinforcement are prepared, and the static loading test is carried out. The results show that the ultimate bending moment of recycled aggregate concrete beams is the largest when the replacement ratio of recycled coarse aggregates is 30%. The correction coefficient is suggested to take 0.7 when the replacement ratio of recycled coarse aggregates is more than 50% and when the cracking moment of recycled aggregate concrete beams is calculated by ordinary concrete formula. It is still feasible to calculate the ultimate loading capacity of normal section of recycled aggregate concrete beams with ordinary conexete formula.
出处
《混凝土与水泥制品》
北大核心
2012年第7期54-57,共4页
China Concrete and Cement Products
基金
住房和城乡建设部2008科学技术基金项目(2008-k1-11)
江苏省教育厅自然科学基金项目(11KJD560003)
宿迁市科技局基金项目(B2010021)
关键词
再生混凝土梁
再生粗骨料取代率
正截面受弯
破坏形态
Recycled aggregate concrete beams
Replacement ratio of recycled coarse aggregates
Normal sectionbending
Failure modes
