陶瓷再生集料沥青阻热面层性能的室内试验研究

采用导热系数相对较小的陶瓷再生集料等体积取代石灰岩集料制备陶瓷沥青阻热面层,以有效解决沥青路面高温稳定性问题。进行了陶瓷沥青混合料高温稳定性、力学性能、水稳定性、温度阻热性能研究。结果表明:当陶瓷再生集料掺量为60%时,沥青混合料的动稳定度为4893次/mm,浸水残留稳定度为90.6%,冻融劈裂强度比为90.1%,路用性能良好;相比普通沥青混合料,陶瓷再生集料掺量为60%时,试件上表面层与中面层温差从3.7℃增加到6.6℃,阻热降温效果显著。综合陶瓷沥青混合料的路用性能和阻热性能说明,陶瓷再生集料在沥青路面阻热面层中的应用具有可行性。

Experimental study on fouling characteristics and influence factors of spiral-grooved tube

In this paper,we carried out a series of experiments on fouling characteristics of 6 kinds of spiral-grooved tubes to investigate the impact of hardness,temperature and structure parameters of cold water on fouling characteristics of spiral-grooved tube.Experimental results showed that when cold-water temperature decreased,fouling resistance of spiral-grooved tube also decreased.Asymptotic fouling resistance increased accompanied with increase of cold-water hardness.However,the asymptotic fouling resistance appeared to reduce when hardness increased to some extent.Geometric parameters of spiral-grooved tubes had remarkable effect on fouling resistance,which showed a tendency of decrease with increase of groove depth and decrease of pitch.In this study,the minimum asymptotic fouling resistance was observed in the spiral-grooved tube with small pitch and large groove depth.