改性乳化沥青路面防水层抗渗水性能研究

桥面渗水问题主要因防水层的防渗能力不足所致,对防水层抗渗水性能进行研究意义重大。使用热塑性橡胶对乳化沥青材料进行改性,然后应用于路面的防水层,对其进行抗渗及抗废劳性能试验。试验结果表明:使用改性乳化沥青材料构建的路面防水层试件的防渗水性能、抗疲劳能力均优于未改性的乳化沥青材料;且改性乳化沥青试件在荷载作用4985次之后才出现裂缝,未改性试件在荷载作用1927次之后便出现裂缝,说明改性乳化沥青材料能够有效提高路面的防渗水能力,避免因渗水引起钢筋材料腐蚀问题的发生,从而延长路面的使用寿命。

车辆荷载作用下路面防水层施工技术分析

对于道路施工过程中,防水层的建设期间需要思量车辆荷载、施工环境等的影响。如果压实度不足,排水设计不合理,运用不合理的安装技术,都会使得防水层性能受到影响,极易出现过早失效的问题。所以,应运用先进的施工技术及实践有效提升道路表面防水系统的耐久性,让其使用时间更持久。由于车辆载荷带来的难题需要积极地运用先进的施工技术,以此攻克道路运行过程中发生的各种问题。本次就针对车辆荷载作用下路面防水层施工技术进行全面探究。

Bond condition between surface layer and immediate layer in porous asphalt pavement

Through the shear tests on composite specimens using four different kinds of tack coat material （epoxy resin, SBS modified emulsified asphalt, SBS modified asphalt and H# bridge waterproof material）, the bond condition between layers of porous asphalt pavement under traffic load, temperature variation and moisture situation is evaluated. The test results show that the bond strength decreases with the rise in temperature, and the relationship between shear strength and temperature can be expressed by a logarithm curve at a high reliability. Under the action of traffic load, the value of shear strength of the mixture right under the centre of the wheel track is smaller than that of other parts of the pavement. It is also found that some effects concerning moisture have comparative effects on the bonding of the two layers. Given all the results achieved during the study, it will be quite rewarding to make rational comparisons during selecting the sound type of tack coat.

先简支后结构连续桥梁施工技术

先简支后结构连续桥梁结构施工技术被广泛应用于各类桥梁施工中,针对先简支后结构施工技术进行了介绍,结合工程实例对先简支后结构连续桥梁上部结构和下部结构施工要点进行详细分析,提出相应的解决方案,以期为类似工程提供借鉴。