国家速滑馆看台L形再生混凝土梁板工作性能试验  

Experimental study on working performance of L-shaped recycled aggregate concrete beam-slabs in the stands of National Speed Skating Hall

作　　者：刘亦斌 曹万林[1] 张建伟[1] 张旭鹏 翁浩峰 王如伟[1] LIU Yibin;CAO Wanlin;ZHANG Jianwei;ZHANG Xupeng;WENG Haofeng;WANG Ruwei(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市建设学部,北京100124

出　　处：《自然灾害学报》2022年第1期108-116,共9页Journal of Natural Disasters

基　　金：国家重点研发计划课题(2017YFC0703304)。

摘　　要：北京2022年冬奥会速滑馆项目中,场馆观众区的看台应用了L形再生混凝土梁板,混凝土再生粗骨料取代率为30%、细骨料为天然砂,混凝土设计强度等级为C45。对国家速滑馆看台L形再生混凝土梁板进行了受力性能和碳化性能研究。进行了3个足尺L形再生混凝土梁板受力性能试验,试件长度4 120 mm、总宽度1 180 mm,试件肋梁的截面宽200 mm、高498 mm,试件板的截面宽度980 mm、厚度100 mm,研究了试件在不同加载下的刚度、承载力、变形和裂缝发展情况。进行了4组再生混凝土试件3 d、7 d、14 d、28 d的碳化性能试验,每组3个试件,试件尺寸100 mm×100 mm×300 mm,研究了不同碳化天数下的碳化深度。结果表明:L形再生混凝土梁板满足工程所需的刚度、承载力要求;在合理控制再生骨料掺量的条件下再生混凝土的碳化性能与普通混凝土相差不大,可以满足其抗碳化性能的要求。In the project of Speed Skating Hall of Beijing 2022 Winter Olympic Games,L-shaped recycled aggregate concrete(RAC)beam-slabs are used in the stands of the spectator area. The replacement rate of recycled coarse aggregate is 30%,the fine aggregate is natural sand,and the design strength grade of concrete is C45.The L-shaped RAC beam-slabs in the stands of National Speed Skating Hall were studied,including mechanical properties and carbonation properties.Three full-scale L-shaped RAC beam-slabs were tested.The length of the specimens was 4120 mm,the total width was 1180 mm,the width of the rib beam was 200 mm and the height was 498 mm,the width of the plate was 980 mm and the thickness was 100 mm.The stiffness,bearing capacity,deformation and crack development of the specimens under different loads were studied.The carbonation performance of 4 groups of RAC specimens was tested for 3,7,14 and 28 days,with three specimens in each group,and the specimen size was 100 mm × 100 mm × 300 mm.The carbonation depth under different carbonation days was studied.The results show that the L-shaped RAC beam-slabs meet the requirements of stiffness and bearing capacity.Under the condition of reasonable control of recycled aggregate content,the carbonation performance of recycled aggregate concrete is similar to that of ordinary concrete,which can meet the requirements of carbonation performance.

关 键 词：L形再生混凝土梁板 受力性能 碳化性能 试验研究 

分 类 号：TU375[建筑科学—结构工程] X45[环境科学与工程—灾害防治]