论文部分内容阅读
从沥青旧路面材料的筛分组成分析及配合比设计出发,采用复合式冷再生技术对旧路路面的面层和基层混合料进行研究。通过对不同种类混合料试件在不同试验温度下(20℃、30℃和40℃)进行抗压强度、劈裂强度和抗压回弹模量试验,分析了温度对混合料强度特性影响的规律及机理,此外对混合料的冻融性能进行了研究。试验结果表明:冷再生混合料的强度和抗冻性在常用水泥用量范围内(5%~6%)能够满足高速公路基层强度要求;随着温度升高,采用普通水泥的再生混合料强度有所降低,且衰减趋势接近线性关系;采用矿渣水泥的再生混合料强度略有上升。因此,对于不受温度影响的路面结构层可选普通水泥,而对受温度影响较大的结构层则优选矿渣水泥。
Based on the analysis of the composition of the asphalt pavement materials and the mix design, the compound cold recycling technology was used to study the surface layer and the grassroots mixture of the old pavement. The compressive strength, splitting strength and compressive resilience modulus of different kinds of mixture specimens were tested under different test temperatures (20 ℃, 30 ℃ and 40 ℃), and the effect of temperature on the strength characteristics of the mixture was analyzed Law and mechanism, in addition to the freeze-thaw properties of the mixture were studied. The test results show that the strength and frost resistance of cold recycled mixture can meet the requirements of expressway grassroots strength within the range of common cement content (5% ~ 6%). With the increase of temperature, the strength of recycled mixture with ordinary cement is Decreased, and the attenuation trend is close to a linear relationship; the strength of recycled mixture with slag cement increased slightly. Therefore, for the pavement structure layer not affected by temperature, ordinary cement can be selected, while for the structural layer that is more affected by temperature, slag cement is preferred.