冷热循环-荷载耦合下锂渣混凝土梁变形性能试验研究

通过10根冷热循环-荷载耦合下锂渣混凝土梁试件的受弯性能试验,研究了聚丙烯纤维,冷热循环次数及应力比对锂渣混凝土梁曲率和截面弯曲刚度的影响。研究结果表明:聚丙烯纤维可以降低冷热循环对锂渣混凝土的损伤作用,减小试验梁的曲率,减缓水泥水化的速率;锂渣混凝土梁曲率随着冷热循环次数的增加,呈现先减小再增大后降低的规律,100次冷热循环下曲率最小;聚丙烯纤维锂渣混凝土梁曲率随着冷热循环次数的增加呈现先降低后增加的规律,300次冷热循环下曲率最小;随着应力比的增加,试验梁截面曲率减小,截面弯曲刚度增大。

Experimental study on the deformability of lithium slag concrete beams under coupling between loading and thermal-cold cycles

Through the 10 bending performance test of the specimens of lithium slag concrete beams under cold-heat cycle-load coupling,the effects of polypropylene fiber,number of cycles and stress ratio on the curvature and section bending stiffness of lithium slag concrete beams were studied.The results show that the polypropylene fiber can reduce the damage of the hot and cold cycle to the lithium slag concrete,reduce the curvature of the test beam and slow down the rate of cement hydration.The curvature of the lithium slag concrete beam increases with the increase of the number of hot and cold cycles.Reducing the law of decreasing and then increasing,the curvature is the smallest under 100 cycles of cold and heat cycle.The curvature of polypropylene fiber slag concrete beam decreases first and then increases with the increase of the number of hot and cold cycles,and the curvature of 300 hot and cold cycles The minimum as the stress ratio increases,the curvature of the test beam decreases and the bending stiffness of the section increases.