蒸压改性钢渣骨料钢筋混凝土梁抗弯性能

Flexural performance of autoclaved modified steel slag aggregate reinforced concrete beams

为了研究改性后钢渣骨料取代天然骨料对钢筋混凝土梁抗弯性能的影响规律,制作了7根蒸压改性钢渣骨料钢筋混凝土梁(autoclaved modified steel slag concrete beams,AMSSCB)和1根天然碎石骨料钢筋混凝土梁(natural aggregate concrete beams,NACB),对其在不同改性钢渣骨料取代率和不同受拉钢筋配筋率下的抗弯性能进行了研究分析。结果表明:不同改性钢渣骨料取代率的AMSSCB在静载作用下,其裂缝发展规律与NACB相似;随着改性钢渣骨料取代率的提高,试验梁开裂荷载和极限荷载均呈先升高、后降低的整体趋势,在取代率为60%时达到最大值,相比于NACB,AMSSCB的开裂荷载提高约12.9%,极限荷载提高13.0%;AMSSCB在受弯过程中仍符合平截面假定,且随着改性钢渣骨料取代率的提高,试验梁初始受压区高度有所增加。

For a better study of the influences of the replacement of natural aggregate by modified steel slag aggregate on the flexural performance of reinforced concrete beams,seven autoclaved modified steel slag concrete beams(AMSSCB)and one natural aggregate concrete beam(NACB)were made in this work.The flexural performance under different replacement rates and different tensile reinforcement ratios was studied and analyzed.The results show that the crack development law of AMSSCB with different substitution rates of modified steel slag aggregate is similar to that of NACB under static load.With the increase of the replacement rate of modified steel slag aggregate,the cracking load and ultimate load of the test beams increases first and then decreases,and the maximum value is reached at a replacement rate of 60%.Compared with the NACB,the cracking load of AMSSCB increases by about 12.9%,and the ultimate load increases by 13.0%.AMSSCB still conforms to the plane section assumption during the bending process,and the initial compression zone height of the test beam increases with the increase of the substitution rate of modified steel slag aggregate.