扩建工程非同层等厚沥青路面拼接方案研究

Study on Splicing Scheme of Asphalt Pavement with Equal Thickness of Non-same Layer in Expansion Project

摘要:

主要开展了非同层等厚条件下的老沥青层-新水稳层拼接方案研究。依托江苏省连淮高速公路扩建工程，选用了水泥浆、地聚物、水泥乳化沥青复合材料、地聚物乳化沥青复合材料等几种拼接界面材料，通过设计室内复合件拉拔强度试验、地推直剪试验及半圆弯拉试验来评价界面材料的黏结效果。研究结果表明：地聚物乳化沥青复合材料的剪切强度、断裂能分别是地聚物的1.53倍、1.3倍，黏结效果优于地聚物；灌注地聚物的剪切强度是未灌浆的1.35倍，地聚物加固效果优于水泥浆。建议采用地聚物乳化沥青复合材料+地聚物灌浆的拼接技术方案。

Abstract:

The splicing scheme of old asphalt layer and new water stable layer under the conditions of equal thickness and non-same layer is mainly studied. Relying on Jiangsu Province Lianhuai Expressway Extension Project, several splicing interface materials of cement slurry, geopolymer, cement emulsified asphalt composite material and geopolymer emulsified asphalt composite material are selected. The bonding effect of the interface materials is evaluated through indoor composite tensile strength tests, ground push direct shear tests and semi-circular bending tensile tests. The research results show that the shear strength and fracture energy of geopolymer emulsified asphalt composite materials are 1.53 times and 1.3 times that of geopolymer, respectively. The bonding effect is better than that of geopolymer, and the shear strength of injected geopolymer is 1.35 times that of ungrouted geopolymer. The reinforcement effect of geopolymer is better than that of cement slurry. It is recommended to adopt the splicing technology scheme of geopolymer emulsified asphalt composite materials and geopolymer grouting.