环保型蓄盐沥青混合料性能损伤演变

doi:10.13229/j.cnki.jdxbgxb.20230552

Abstract

Abstract:

In order to accurately predict the effect of precipitation and ice condensation on the engineering performance of asphalt mixtures during the service of environmentally friendly salt storage asphalt pavements， the long-term road performance changes of asphalt mixture were studied based on immersion freeze-thaw cycle tests. Based on the theory of life reliability and damage principle， considering the influence of moisture and freeze-thaw cycle on salt storage asphalt mixture， the damage evolution model of asphalt mixture under immersion-freeze-thaw condition was established， and the evolution of engineering performance damage of ordinary asphalt mixture and environmentlly-friendly salt storage asphalt mixture was compared. The experimental results show that with the increase of the number of immersion-freeze-thaw cycles， the porosity of the salt storage asphalt mixture increases obviously， while the performance indexes of splitting strength and dynamic stability decrease obviously， and the variation range of the salt storage asphalt mixture is always greater than that of the ordinary asphalt mixture. According to the model calculation and analysis， under the damage of immersion-freeze-thaw， with the precipitation of snow melting salt， the destruction of environmently-friendly salt storage asphalt mixture is developed from the outside to the inside， and the immersion-freeze-thaw cycle has a more significant effect on the splitting tensile strength of the asphalt mixture， which will affect the pavement performance to a certain extent.

Key words: road engineering, environmentally friendly salt storage asphalt mixture, immersion-freeze-thaw cycle, engineering performance, damage model

CLC Number:

U416

Jing-yang YU,Dong-zhao LI,Zhi-qing ZHANG,Zhen WANG,Hai-lin SUN,Hai-ling BU,Ming-chun LI. Evolution of damage to performance of environment⁃friendly salt storage asphalt mixture[J].Journal of Jilin University(Engineering and Technology Edition), 2025, 55(3): 888-898.

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试验指标	实测值	规范值	试验方法
针入度（5 s，100 g，25 ℃）/mm	69	60~80	T0604
软化点（R&B）/℃	80.5	≥75	T0606
延度（5 ℃）/cm	39	≥30	T0605
RTFO质量变化/%	-0.168	≤±1.0	T0609
残留针入度比（25 ℃）/%	84.1	≥60	T0604
RTFO残留延度（5 ℃）/cm	27	≥20	T0605

组别	RX替代量/%	筛孔尺寸/mm下通过百分率/%
组别	RX替代量/%	16	13.2	9.5	4.75	2.36	1.18	0.6	0.3	0.15	0.075
1	15	100	94	60.2	29.7	19.7	15.9	13.0	11.1	12.2	10.3
2	30	100	94	60.2	29.7	19.7	15.9	13.0	11.3	12.5	9.7
3	45	100	94	60.2	29.7	19.7	15.9	13.0	11.4	12.6	9.3
4	60	100	94	60.2	29.7	19.7	15.9	13.0	11.0	12.8	8.3

级配分组	蓄盐填料/%	相对毛体积密度	空隙率/%	矿料间隙率/%	沥青饱和度/%	稳定度/kN	流值/mm
规范值	—	—	3.5~4.5	≥17	75~85	≥6	—
1	15	2.507	3.78	17.26	78.01	13.63	4.6
2	30	2.504	3.94	17.22	77.11	13.06	4.3
3	45	2.505	4.05	17.15	76.38	12.64	4.0
4	60	2.508	4.21	17.09	75.36	11.79	3.8

混合料种类	组别	浸泡时间/d	冻融次数/次
蓄盐沥青混合料试件	1	12	2
	2	24	4
	3	36	6
	4	48	8
	5	60	10
普通沥青混合料试件	6	12	2
	7	24	4
	8	36	6
	9	48	8
	10	60	10

混合料类型	性能指标	参数			相关系数R2	实测D₁₀/%	预测D₁₀/%	相对误差/%
混合料类型	性能指标	α	ν	λ₀	相关系数R2	实测D₁₀/%	预测D₁₀/%	相对误差/%
普通沥青混合料	劈裂强度	0.669	0.038	0.030	0.991	28.3	29.2	3.2
普通沥青混合料	动稳定度	0.734	0.015	0.019	0.974	25.3	26.4	4.4
蓄盐沥青混合料	劈裂强度	0.757	0.141	0.106	0.956	49.5	51.8	4.6
蓄盐沥青混合料	动稳定度	0.755	0.076	0.060	0.989	38.8	39.5	1.8

Evolution of damage to performance of environment⁃friendly salt storage asphalt mixture

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