再生高强混凝土基本力学性能研究

Study on the mechanical properties of recycled high strength concrete

为研究再生粗骨料取代率与玄武岩纤维对再生高强混凝土的抗压强度、抗折强度、劈裂强度与弹性模量的影响,对再生高强混凝土78个试件进行试验。试验结果表明,相同强度等级下,随再生粗骨料取代率增加,混凝土坍落度、抗压强度和弹性模量存在下降趋势;随着玄武岩纤维含量的增大,混凝土抗折强度与劈裂强度呈现先增加后下降的趋势,但对混凝土抗压强度影响较小。当再生粗骨料取代率取30%时,混凝土强度高且和易性好,为适宜的取代率。

A total of 78 specimens of recycled high strength concrete were tested,and the effects of the replacement rate of recycled coarse aggregate and basalt fiber on the compressive strength,flexural strength,splitting strength and modulus of elasticity of recycled high strength concrete were studied.The results show that under the same strength grade,the concrete slump,compressive strength and modulus of elasticity decrease with the increase of the replacement rate of recycled coarse aggregate,;and with the increase of basalt fiber content,the flexural strength and splitting strength of concrete increase first and then descend,but it has little effect on the compressive strength of concrete.When the replacement rate of recycled coarse aggregate is 30%,the strength of concrete is high and the workability is good.