浇注式沥青结合料老化性能试验研究

论文总字数：25551字

摘 要

作为钢桥面典型铺装材料之一，浇注式沥青混凝土以优异的柔变性能、密水性被广泛用于桥梁铺装工程中。然而，浇注式沥青混凝土的拌合温度为220~260℃，远高于热拌改性沥青混合料的拌和温度，并且其拌合时间4~6小时也远比普通石油沥青混合料拌和时间要长。在高温条件下经历长时间的拌合，浇注式沥青结合料的老化现象显然是不能避免的。沥青的老化会使其性能衰减，严重影响路面的正常使用，因此，对浇注式沥青混凝土结合料的老化性能研究是非常必要的。

在本论文研究中，以70号基质沥青与特立尼达湖沥青（TLA）不同质量比混合掺配形成的浇注式沥青以及成品改性浇注式沥青为研究对象，通过针入度、软化点、25℃延度性能试验，对两大类浇注式沥青的老化前后的三大指标进行了对比试验研究，同时利用再生还原剂对老化沥青进行性能恢复，并测试了三大指标性能。研究结果表明：

1. 70号基质沥青与TLA的合理掺配范围为55%~65%之间，老化温度使浇注式沥青的软化点升高，延度和针入度降低，加入再生还原剂后三大指标在一定程度上得到恢复。
2. 成品改性浇注式沥青在老化后，其软化点下降，而延度和针入度降低，加入再生还原剂后，性能同样得到恢复。

关键词: 钢桥面铺装，浇注式沥青，老化，再生还原

EXPERIMENTAL STUDY ON AGING PERFORMANCE

OF BINDING OF GUSS ASPHALT MIXTURES

Abstract

As one of the typical paving materials of steel bridge deck, for its excellent flexibility and water density, guss asphalt is widely used in bridge pavement engineering. However, the mixing temperature of guss asphalt is among 220-260 deg.c, which is much higher than mix temperature of hot mix modified asphalt mixture, and its mixing progress which last 4~6 hours is much longer than the mixing time of ordinary asphalt mixture. Having experienced such long time mixing under the condition of high temperature, the aging phenomenon of binder of guss asphalt is obviously existed. Aging of asphalt will make its performance decay, which seriously affect the normal use of the road. Therefore, it is very necessary to study the aging property of the binder of guss asphalt.

In this paper, the research object is commercial modified guss asphalt and the guss asphalt mixed by 70# asphalt and Trinidad Lake Asphalt (TLA) in different proportions.

Through the performance test in penetration, softening point, and ductility at 25 deg.c to these two kinds of guss asphalt, their three indicators of before aging and after aging were compared in the study. The performance of aging asphalt was recovered with regeneration agent, and the performance of the three indexes was tested. Furthermore, regeneration agent was used to regenerate the performance of aging asphalt, and the three indicators after regeneration were tested.

Research results show that:

The appropriate blending proportions of 70# asphalt and TLA is between 55% to 65%. Aging lead the three indicators of guss asphalt changed: softening point increases, ductility and penetration reduce, and they partially regenerated after adding regeneration agent.

Commercial modified guss asphalt after aging performance is as follows: the softening point, ductility and penetration reduce, and after adding regeneration agent, the three indicators were partially regenerated.

KEY WORDS：Steel bridge deck pavement, Guss asphalt, Asphalt aging, Regeneration

目录

第一章 绪论 1

1.1 研究背景 1

1.1.1钢桥面铺装 1

1.1.2 浇注式沥青混凝概况 2

1.1.3 存在的问题 2

1.2国内外研究现状 3

1.2.1 浇注式沥青混凝土 3

1.2.2 沥青老化机理 5

1.2.3 沥青再生剂 7

1.3研究内容及方案 8

第二章 配合比研究 10

2.1试验原材料 10

2.1.1 特立尼达湖沥青 10

2.1.2 基质沥青 10

2.1.3试样制备 11

2.2试验方法 11

2.2.1 针入度 11

2.2.2 软化点 12

2.2.3 延度 13

2.2.4 注意事项 14

2.3 试验结果及分析 15

第三章 沥青老化试验 19

3.1 试验材料 19

3.2 试验方法 19

3.3试验结果及分析 20

第四章 老化再生试验 23

4.1试验目的 23

4.2 试验材料 23

4.3试验方案 23

4.4试验结果及分析 24

第五章 总结 29

5.1主要结论 29

5.2展望 29

参考文献（References） 30

致谢 31

剩余内容已隐藏，请支付后下载全文，论文总字数：25551字