废旧轮胎橡胶粉对再生混凝土力学特性的试验研究

Experimental Research of Waster Tire Rubber Powder on Mechanical Properties of Recycled Coarse Aggregate Concrete

再生混凝土被视为节约材料的一种重要举措,同时,废旧轮胎橡胶粉的适量掺入可以优化混凝土的性能。为使两种废弃材料合理利用,本文以废旧轮胎橡胶粉和废弃混凝土加工生成的再生骨料为研究对象,研究了外掺废旧轮胎橡胶粉对再生混凝土力学特性的影响。通过对再生混凝土基准组的试验研究,得到了再生混凝土前28 d的强度发育规律,结合此规律并在其他学者研究的基础上拟合出再生混凝土早期抗压强度数学模型;同时,对再生混凝土外掺不同粒径(20目、60目、80目、100目、120目)和不同掺量(3%、6%、9%)的橡胶粉,并研究此情况下橡胶粉对不同龄期再生混凝土的抗压强度的影响。试验结果表明:掺入橡胶粉会降低再生混凝土的抗压强度;当掺入粒径为20目,掺量为3%的橡胶粉时,再生混凝土抗压强度最好。

Recycled concrete is regarded as an important measure to save material,at the same time,incorporation of an appropriate amount of waste tire rubber powder can optimize the performance of concrete. In order to make rational use of these two waste materials,this article studied how the waste tire rubber powder influence the character of mechanical properties of recycle concrete,based on the waste tire rubber powder and recycled aggregate. Through the experimental study of recycled concrete baseline group,the article discovered the strength development regularities in early 28 days. Based on these regularities and other scholars' researches,this article formed the mathematical equation of the recycled aggregate concrete. It also discovered the influence on the compressive strength of recycled coarse aggregate concrete in different ages by mixing different particle size(20 mesh,60 mesh,80 mesh,100 mesh,120 mesh) and mixing different incorporation amount(3%,6%,9%). The results show that:Strength will be reduced by mixing rubber powder. The recycled aggregate concrete can reach the best compressive strength when mixed with 20 mesh,3% rubber powder.