公路养护工程中不粘轮乳化沥青粘层的运用

在公路养护工程中,为避免其病害出现,保证公路路面的使用质量,在实际施工中就要对基层进行相应的处理,以保证路面具有良好的防水性能,减少路面发生病害的可能。当前,为了保证基层和面层之间有良好的粘结效果,延长路面的使用寿命,在基层表面铺设不粘轮乳化沥青粘层取得了较好的养护效果。为此,本文将针对公路养护工程中不粘轮乳化沥青粘层的运用展开深入探究,以期为相关从业者提供借鉴和参考。

乳化沥青粘层用油量研究及质量控制分析

针对乳化沥青粘层质量难以控制的问题,通过室内剪切试验确定了沥青路面粘层乳化沥青最佳用油量。结合施工现场,通过现场检测和试验,发现乳化沥青的喷洒量达不到规范和设计要求。不同的路面层结构对应着不同的最佳喷洒量,乳化沥青的喷洒量是控制粘层质量的关键,喷洒车车速的控制是喷洒量控制的有效技术途径。有序的施工组织和良好的下卧层清理是控制粘层质量的重要方法。

粘层乳化沥青层间抗剪性能及其评价方法研究

为解决路面养护工程中超薄罩面层与原始路面间易出现剪切破坏的问题,选取三种乳化沥青通过斜剪试验模拟路面在车辆荷载下的剪切破坏。结果表明,温度升高会导致乳化沥青层间抗剪强度下降;面层混合料集料粒径增大与沥青量增多会导致层间抗剪强度增加;不同乳化沥青自身性质差异会导致层间抗剪强度不同,较SBS乳化沥青与普通乳化沥青,橡胶乳化沥青粘结性能最好。对比完整车辙板与复合车辙板的抗剪强度,复合路面抗剪强度较完整路面会发生不同程度的下降,其中无粘层油的空白复合车辙板下降程度最大,抗剪强度仅有完整路面的64.37%。通过洒布粘层乳化沥青可以使层间抗剪强度提高,其中橡胶乳化沥青可达到完整路面抗剪强度的75.85%。

路面粘层复合改性沥青材料研发与性能评价

针对路面结构粘层沥青材料特点,以苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS)、胶粉(CRM)为改性剂,采用高速剪切法在室内制备了一种粘层复合改性沥青材料。基于对粘层沥青高温性能及粘度的测定,优化了复合改性沥青室内制备工艺。通过常规指标测试、高温动态剪切试验、动态力学性能分析、粘度试验,对不同掺量复合改性沥青的路用性能进行评价,并确定改性剂最佳掺量。研究表明所研发的粘层复合改性沥青路用性能较优,更能满足粘层沥青材料的要求,研究结果可供同行参考。

粘层用复合改性乳化沥青制备及层间性能研究

介绍了一种道路粘层用复合改性乳化沥青的制备方法,并对其性能进行研究。将水性聚氨酯和SBR胶乳复合对乳化沥青进行改性,水性聚氨酯改性材料有良好的胶结性能,用它改性的乳化沥青粘层材料具有优异的粘结性,由于水性聚氨酯的改性降低了乳化沥青的低温性能,加入SBR胶乳复合改性,可达到改善低温指标的目的。

新型薄层罩面技术在京港澳高速公路大修工程中的应用研究

在对薄层罩面沥青混合料施工工艺和级配类型分析的基础上,结合2017年京港澳高速公路大修工程,展开对TAC-10、和SMA-10两种间断级配薄层罩面沥青混合料的应用技术研究。通过对薄层罩面沥青混合料配合比设计、生产施工质量控制要点分析、检测结果和经济性能等内容分析结果表明,薄层罩面是一种路用性能和经济性能兼备的高速公路路面养护技术。

改性乳化沥青透层、粘层在路面工程中的应用情况

本文主要介绍了乳化沥青透层、粘层概念、原理及应用范围，论述了目前使用乳化沥青用于透层、粘层的必要性，说明了这些材料在路面工程中的应用情况。

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.

Mix design method of asphalt rubber open-graded friction course and its application in overlay

The mix design method of asphalt rubber open-graded friction course （AR-OGFC） by the Marshall test and key technologies of AR-OGFC overlay are studied. Based on the draindown test, the stripping test and the Marshall test by different beating times, the asphalt content estimating method and Marshall beat criterion are studied. It is found that the asphalt content of AR-OGFC can be estimated by the formula of Arizona, and the proper Marshall test criterion for AR-OGFC is 50 beats on both sides. By analyzing the influence of gradation on OGFC performance, the gradation of AR-OGFC is recommended, and the amount of aggregate passing 4. 75 mm should be minimized for AR-OGFC. Through investigation of AR-OGFC overlay projects, key technologies such as the treatment of underlying pavement and the selection of tack coat are advanced, and modified emulsified asphalt should be used in AR-OGFC overlay tack coat.