基于性能-费用模型的厂拌再生沥青混合料优化设计

doi:10.13229/j.cnki.jdxbgxb20200799

Abstract

Abstract:

In order to overcome the risk of insufficient moisture stability of the recycled hot-mix asphalt （RHMA）, this work aims to optimize the material design of RHMA based on the performance-cost model by considering the moisture stability as the control index. First， the quadratic regression model involves independent variables （reclaimed asphalt pavement （RAP） content， asphalt content， and aggregate gradation） and dependent variable （moisture stability） was established. Second， the cost model was proposed covering the whole construction process， thereby the optimal material design model of RHMA was drawn. Finally， the optimal design parameters were calculated with the performance-cost model by jointly using the genetic algorithm and linear comprehensive evaluation method. The results show that the response surface can effectively address the material design of RHMA， and the independent variables were found significant to the moisture stability of HRMA. The proposed model was proved valid in project of the Sanming section of Fuzhou-Yinchuan expressway， the optimized cost was 26.7% lower than the actual cost at the same moisture stability control objective， and the optimized material parameters of HRMA for RAP content， asphalt content， and gradation parameter were 51%， 4.61%， and 0.445， respectively.

Key words: road engineering, recycled asphalt mixture, response surface method, performance-cost model, moisture stability, optimal design

CLC Number:

U416.2

Yu-quan YAO,Jian-gang YANG,Jie GAO,Liang SONG. Optimal design on recycled hot⁃mix asphalt mixture based on performance⁃cost model[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(3): 585-595.

Figures/Tables 19

Table 1

Fig.1

Table 2

Model parameters"

物理量含义	符号	取值
再生沥青混合料施工面积/m²	a₁	10⁵
铺装厚度/m	h	0.06
RHMA标准压实密度/（t?m^-3）	D₁	2.420
再生剂的用量（RAP质量比）/%	A₁	0.1
RAP油石比/%	B₁	4.94
RAP铣刨、破碎与筛分费用/（元·t^-1）	$p 1$	10
粗集料费用/（元·t^-1）	$p 2$	58
细集料费用/（元·t^-1）	$p 3$	45
新沥青费用/（元·t^-1）	$p 4$	4 800
再生剂费用/（元·t^-1）	$p 5$	20 000
运输费用/［元·（t?km）^-1］	$p 6$	0.5
RHMA生产费用/（元·t^-1）	$p 7$	20
RHMA摊铺碾压费用/（元·m^-2）	$p 8$	5
RAP运距/km	l₁	60
粗细新集料运距/km	l₂	150
沥青运距/km	l₃	200

Table 2

Fig.2

Fig.3

Table 3

Table 4

Table 5

Table 6

Table 7

Fig.4

Fig.5

Table 8

Table 9

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

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因素	水平
RAP掺量A/%	20	40	60
沥青含量B/%	4.2	4.5	4.8
矿料级配C	级配I	级配II	级配III

指标	试验结果	试验方法
25 ℃针入度/（0.1 mm）	48.1	T0604
软化点/℃	74.9	T0606
5 ℃延度/cm	30.0	T0605

集料规格/mm	压碎值/%	表观相对密度	针片状/%	黏附性
19~26.5	-	2.749	6.3	5级
16~19	-	2.731	7.8	5级
13.2~16	-	2.714	8.7	5级
9.5~13.2	15.3	2.741	11.4	-
4.75~9.5	-	2.730	17.5	-
2.36~4.75	-	2.726	-	-
1.18~2.36	-	2.711	-	-
0.6~1.18	-	2.717	-	-
0.3~0.6	-	2.721	-	-
0.15~0.3	-	2.709	-	-
0.075~0.15	-	2.733	-	-
技术要求	≤28	≥2.5	粒径>9.5，≤15	≥4级
技术要求	≤28	≥2.5	粒径<9.5，≤20	≥4级
试验方法	T0316	T0304	T0312	T0616

试验项目		技术要求	试验结果	试验方法
通过率 /%	0.6 mm	100.0	100.0	T0351
	0.3 mm	95.0~100.0	100.0
	0.15 mm	90.0~100.0	96.7
	0.075 mm	80.0~100.0	81.5
外观		无团粒结块	无团粒结块	-
加热安定性		实测记录	无明显变色	T0355
表观相对密度		≥2.5	2.721	T0304

筛孔/mm	0~8 mm		8~12 mm		12~20 mm
筛孔/mm	抽提前	抽提后	抽提前	抽提后	抽提前	抽提后
沥青含量/%	-	6.85	-	3.95	-	3.25
26.5	100.0	100.0	100.0	100.0	100.0	100.0
19	100.0	100.0	100.0	100.0	99.7	99.8
16	100.0	100.0	100.0	100.0	79.4	90.4
13.2	100.0	100.0	99.8	100.0	46.9	70.2
9.5	100.0	100.0	83.5	91.0	5.3	31.2
4.75	71.7	87.9	8.1	26.1	1.4	18.8
2.36	33.9	59.7	1.6	18.5	0.8	14.4
1.18	16.3	44.5	0.9	16.0	0.6	12.3
0.6	5.4	31.2	0.7	13.4	0.5	10.2
0.3	1.1	20.9	0.4	9.9	0.3	7.5
0.15	0.5	16.4	0.2	7.8	0.1	5.8
0.075	0.1	11.2	0.1	5.3	0.0	4.1

Optimal design on recycled hot⁃mix asphalt mixture based on performance⁃cost model

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