橡胶再生混凝土和易性试验研究
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摘要
取再生粗骨料取代率为20%,用粒径0.55~2.36 mm橡胶颗粒等体积置换砂配制橡胶再生混凝土,通过混凝土坍落度试验研究了橡胶粒掺量、橡胶粒改性方式和粉煤灰掺量对混凝土拌合物和易性的影响规律。结果表明:掺橡胶粒的混凝土拌合物的流动性大于未掺橡胶粒的混凝土,且随着橡胶粒掺量的增加,混凝土拌合物的流动性逐渐增强;NaOH与KH-550复合改性混凝土拌合物的流动性最大,其他改性与未改性混凝土拌合物的流动性几乎相当;粉煤灰能够提高混凝土拌合物的流动性,由于超叠效应,复掺粉煤灰和橡胶粒的混凝土拌合物的流动性大幅度提高;橡胶再生混凝土拌合物具有良好的黏聚性和保水性。
Rubber-recycled concrete was mixed with recycled aggregates at a rate of 20% and crumb rubbers with size of 0.55~2.36 mm which replace sands at the same volume.Through the slump test,the effect of rubber rates,rubber modification method and fly ash rates on workability of rubber-recycled concrete was studied.The results show that the fluidity of rubber-recycled concrete mixture is larger than recycled concrete,with the increase of rubber rate,the fluidity increases gradually.The fluidity of concrete mixture modified by NaOH and KH-550 composite is largest,the other modified and unmodified concrete almost equal.Fly ash can improve the fluidity of concrete mixture,due to synergistic effect,the fuidity of concrete mixture mixed with fly ash and rubber improves greatly.Rubber-recycled concrete mixture has good adhesiveness and water retention.
Rubber-recycled concrete was mixed with recycled aggregates at a rate of 20% and crumb rubbers with size of 0.55~2.36 mm which replace sands at the same volume.Through the slump test,the effect of rubber rates,rubber modification method and fly ash rates on workability of rubber-recycled concrete was studied.The results show that the fluidity of rubber-recycled concrete mixture is larger than recycled concrete,with the increase of rubber rate,the fluidity increases gradually.The fluidity of concrete mixture modified by NaOH and KH-550 composite is largest,the other modified and unmodified concrete almost equal.Fly ash can improve the fluidity of concrete mixture,due to synergistic effect,the fuidity of concrete mixture mixed with fly ash and rubber improves greatly.Rubber-recycled concrete mixture has good adhesiveness and water retention.
引文
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[2]蒋连接,杜彬,佟彤.废橡胶粉在混凝土中的资源化利用[J].混凝土,2014(6):108-111.
[3]李悦,韩兆兴,王敏,等.掺废橡胶微粒的再生混凝土物理力学性能[J].北京工业大学学报,2009(6):748-752.
[4]王静,石元,陈爱玖.橡胶再生混凝土基本力学性能试验研究[J].混凝土,2014(4):74-77.
[5]龙秀海.废旧钢纤维橡胶改性再生混凝土力学性能试验研究[D].广州:广州工业大学,2011(5).
[6]SIDDIQUE R,NAIK T R.Properties of concrete containing scraptire rubber——an overview[J].Waste Management,2004,24(6):563-569.
[7]薛刚,王卫华,姜丽,等.不同改性方法对橡胶集料抹面砂浆性能的影响[J].混凝土,2013(8):110-112.
[8]杨春峰,杨敏,吴文辉.废旧橡胶混凝土工作性能试验研究[J].混凝土,2013(5):83-86,92.
[9]姜丽.废旧轮胎橡胶颗粒在抹面砂浆中的应用研究[D].包头:内蒙古科技大学,2012,6.