温拌剂对沥青断裂和老化性能的影响

doi:10.13229/j.cnki.jdxbgxb20190984

摘要/Abstract

摘要：

针对当前DSR试验、BBR试验在评价温拌沥青断裂性能上的局限性，为准确预估温拌剂对沥青材料断裂性能的影响，选取两种不同类型的温拌剂（Sasobit和ET-3100）加入基质沥青中，并进行旋转薄膜老化（RTFO）和压力箱老化（PAV），对温拌沥青的断裂性能展开研究。采用扩展弯曲梁流变（Ex-BBR）试验和双边缺口拉伸（DENT）试验分别评价了沥青的低应变流变性能和高应变延性断裂性能。另外，采用傅里叶变换红外光谱（FTIR）试验对比了温拌剂加入前、后沥青的分子结构。试验结果表明：3%及以上掺量的Sasobit会显著降低沥青的低应变流变性能和高应变延性断裂性能；ET-3100会略微降低沥青的抗延性断裂性能，但效果并不显著且与掺量无关；FTIR试验结果显示，温拌剂ET-3100减缓了沥青的老化程度，这表现为羟基C=O和亚砜基S=O的减少。

关键词: 道路工程, 温拌沥青, 断裂性能, 低温性能, 扩展弯曲梁流变试验, 双边缺口拉伸试验

Abstract:

The current DSR test and BBR test have limitations in evaluating the fracture performance of warm mix asphalt. In order to accurately predict the effect of warming agent on the fracture properties of asphalt materials， two different types of warming agents （Sasobit and ET-3100） were added to the matrix asphalt， then the rotating thin film oven（RTFO） and pressure aging vessel（PAV） tests were carried out to study the fracture properties of the warm mix asphalt. The extended bending beam rheometer（Ex-BBR） test and double edge notched tension（DENT） test were conducted to characterize the low strain rheological and high strain ductile fracture properties of the warm mix asphalt. In addition， Fourier transform infrared spectroscopy（FTIR） test was conducted to compare the molecular structure of asphalt before and after the addition of warming agent. The test results show that addition of 3% Sasobit and above can significantly reduce the low strain rheological properties and high strain ductile fracture properties of asphalt. ET-3100 can slightly reduce the ductile fracture resistance of asphalt， and this the effect has nothing to do with the amount of ET-300. The FTIR test results show that warming agent ET-3100 slows down the aging degree of asphalt， which is manifested by the reduction of hydroxyl C=O and sulfoxide S=O.

Key words: road engineering, warm mix asphalt, fracture property, low-temperature performance, extended bending beam rheometer test, double edge notched tension test

中图分类号:

U414

阳恩慧,徐加秋,唐由之,李奥,邱延峻. 温拌剂对沥青断裂和老化性能的影响[J]. 吉林大学学报(工学版), 2021, 51(2): 604-610.

En-hui YANG,Jia-qiu XU,You-zhi TANG,Ao LI,Yan-jun QIU. Effect of warm mixing agents on fracture and aging properties of asphalt[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(2): 604-610.

图/表 8

表1

图1

图2

表2

沥青低温分级温度对比"

沥青	养护时间/h	$T C (S)$ /℃	$T C (m)$ /℃	低温连续分级温度/℃	低温PG分级
70^#	1	-28.7	-27.2	-27.2	-22
	2	-25.4	-25.5	-25.4	-22
	72	-24.0	-24.9	-24.0	-22
70^#+1%A	1	-28.4	-27.0	-27.0	-22
	2	-24.6	-25.2	-24.6	-22
	72	-23.5	-24.6	-23.5	-22
70^#+2%A	1	-27.4	-26.5	-26.5	-22
	2	-24.3	-25.3	-24.3	-22
	72	-22.7	-24.1	-22.7	-22
70^#+3%A	1	-25.3	-26.2	-25.3	-22
	2	-22.7	-24.0	-22.7	-22
	72	-21.0	-23.7	-21.0	-16

表2

图3

表3

沥青DENT试验结果"

沥青	$w e$ /（kJ·m^-2）	$β ? w p$ /（kJ·m^-3）	$R 2$	CTOD
70^#	16.50	0.365	0.9977	17.41
70^#+1%A	14.13	0.400	0.9583	13.43
70^#+2%A	13.13	0.429	0.9740	10.70
70^#+3%A	12.74	0.456	0.9379	9.28
70^#+0.2%B	15.49	0.348	0.9908	16.26
70^#+0.5%B	12.79	0.269	0.9625	16.62
70^#+0.8%B	13.30	0.329	0.9647	16.32

表3

图4

表4

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沥青	25 ℃针入度/0.1 mm	15 ℃延度/cm	软化点/℃	PG分级	中温分级
70^#	79.3	＞150	42.3	64-22	22
70^#+1%A	60.2	＞150	52.0	64-22	22
70^#+2%A	52.0	145	59.6	70-22	22
70^#+3%A	47.5	135	69.9	76-22	25
70^#+0.2%B	81.3	＞150	41.8	64-22	22
70^#+0.5%B	81.7	＞150	41.0	64-22	22
70^#+0.8%B	83.6	＞150	38.9	64-22	22

沥青	指标	沥青状态
沥青	指标	原样	RTFOT	PAV
70^#	CI	0.014	0.017	0.018
70^#	SI	0.055	0.085	0.125
70^#+1%A	CI	0.015	0.017	0.019
70^#+1%A	SI	0.068	0.098	0.143
70^#+2%A	CI	0.014	0.018	0.019
70^#+2%A	SI	0.104	0.132	0.189
70^#+3%A	CI	0.014	0.017	0.019
70^#+3%A	SI	0.130	0.174	0.227
70^#+0.2%B	CI	0.012	0.014	0.016
70^#+0.2%B	SI	0.050	0.079	0.117
70^#+0.5%B	CI	0.006	0.009	0.011
70^#+0.5%B	SI	0.043	0.055	0.099
70^#+0.8%B	CI	0.002	0.006	0.007
70^#+0.8%B	SI	0.034	0.038	0.081