城市污水对掺再生橡胶和乳化沥青混凝土的影响  

Influence of urban sewage on the concrete mixed with recycled rubber and emulsified asphalt

作　　者：程智清 郭澍来 杨磊 刘宝举[1] 龙广成[1] CHENG Zhiqing;GUO Shuai;YANG Lei;LIU Baoju;LONG Guangcheng(School of Civil Engineering,Central South University,Changsha 410075,China;Yunnan Traffic Science Research Institute Co.,Ltd.,Kunming 650011,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]云南省交通科学研究院有限公司,昆明650011

出　　处：《水力发电学报》2023年第4期104-113,共10页Journal of Hydroelectric Engineering

基　　金：云南省科技计划项目(202004AR040022)。

摘　　要：针对城市污水对路面混凝土的侵蚀问题,试验研究了模拟城市污水溶液浸泡条件下掺再生橡胶和乳化沥青混凝土的抗压强度、气体渗透性及试件质量随时间的变化规律,结合扫描电镜探讨了城市环境污水对混凝土耐久性的影响及微观机理。结果表明:模拟城市污水的长期浸泡对混凝土强度有一定的劣化作用,并增加了试件质量损失与气体渗透性系数;复掺再生橡胶和乳化沥青可提高同掺量下单掺韧性组分混凝土的耐久性能,而聚乙烯纤维与再生橡胶颗粒、乳化沥青三掺进一步提升了混凝土的耐久性;模拟污水溶液中乳化沥青和氢氧化钙晶体的溶出是导致混凝土强度降低、质量损失的主要原因。本研究可为高韧性和高耐久性的城市道路混凝土研发提供支持,协同提升城市道路品质。In view of the pavement concrete erosion caused by urban sewage,this study conducts experimental tests on the compressive strength,gas permeability and mass change ratio of the concrete mixed with recycled rubber and emulsified asphalt that has been immersed in simulated urban sewage solution for a certain long period.Combining with scanning electron microscopies,we examine the influence of urban environmental sewage on the durability of toughness concrete and its mechanism.The results show that under the long-term immersion,the strength of a concrete specimen is deteriorated,and its mass loss and gas permeability coefficient increased.At the same dosage,combination of rubber particles and emulsified asphalt improves the durability of concrete with single-mixed toughness component;the durability could be further enhanced by mixing polyethylene fiber,rubber particles and emulsified asphalt.The dissolution of emulsified asphalt and calcium hydroxide crystals in the simulated sewage solution is the main cause of strength reduction and mass loss of the concrete specimen.This study helps develop urban road concrete with high toughness and durability to raise urban road quality.

关 键 词：城市环境污水 再生橡胶颗粒 乳化沥青 混凝土强度 耐久性能 

分 类 号：X52[环境科学与工程—环境工程] TV431[水利工程—水工结构工程]