粉煤灰再生混凝土配筋梁的受弯性能研究

Study on bending performance of fly ash recycled concrete reinforced beams

研究了再生粗骨料取代率(0、30%、60%、100%)对粉煤灰混凝土基本力学性能的影响,并设计制作了4根相同配筋率的试验梁,分析了其受弯破坏情况。结果表明:随着再生粗骨料取代率的增加,粉煤灰混凝土的抗压强度、劈裂抗拉强度、轴心抗压强度和弹性模量均先增大后减小;粉煤灰再生混凝土试验梁的正截面应变服从平截面假定,随着再生粗骨料取代率的增加,试验梁的延性和开裂荷载基本呈降低趋势,裂缝数量、裂缝最大宽度和屈服荷载均先增大后减小,极限荷载呈先增大后减小再增大的趋势。

The influence of the replacement rate(0,30%,60%,100%)of recycled coarse aggregate on the basic mechanical properties of fly ash concrete was studied,and four test beams with the same reinforcement ratio were designed to analyze their bending failure.The results show that as the replacement rate of recycled coarse aggregate increases,the compressive strength,splitting tensile strength,axial compressive strength,and elastic modulus of fly ash concrete all increase first and then decrease.The normal section strain of the fly ash recycled concrete test beam follows the plane section assumption.With the increase of the replacement rate of recycled coarse aggregate,the ductility and cracking load of the test beam show a decreasing trend,the number of cracks,the maximum width of cracks,and the yield load all increase first and then decrease,and the ultimate load shows a trend of increasing first,then decreasing,and then increasing again.