Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (1): 210-219.doi: 10.13229/j.cnki.jdxbgxb20210516

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Evaluation of influence of gradation segregation on pavement moisture damage under action of dynamic and static water environment

Xu CHEN1,2(),Chao-fei CAO1,2,Jing SHANG1,2,Ming-xing HUANG1,3,Chang-fa AI1,2,Dong-ya Ren1,2()   

  1. 1.School of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，China
    2.Highway Engineering Key Laboratory of Sichuan Province，Chengdu 610031，China
    3.Sichuan Suiguangsuixi Expressway Co. ，Ltd. ，Suining 629000，China
  • Received:2021-06-08 Online:2023-01-01 Published:2023-07-23
  • Contact: Dong-ya Ren E-mail:chenxuyouxiang@my.swjtu.edu.cn;dongyaren@swjtu.edu.cn

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Abstract:

In view of the deficiency of the existing research on the effect of gradation segregation on the water damage resistance of asphalt mixture， the effects of various water environment effects and different segregation degrees on the water loss resistance of asphalt mixture were studied based on the moisture sensitivity tester（MIST）. The results show that： the weakening order of water environment on splitting strength and marshall stability is "static immersion + MIST （long-term + short-term effect）" > "MIST （short-term effect）" > "static immersion （long-term effect）"； after the occurrence of gradation segregation， the order of splitting strength and Marshall stability is HC （heavy segregation of coarse aggregate） < LC （mild segregation of coarse aggregate） < D （no segregation） < LF （mild segregation of fine aggregate） < HF （heavy segregation of fine aggregate）； the effect of hydrodynamic environment aggravates the effect of gradation segregation on splitting strength and Marshall stability， and the effect of gradation segregation on water permeability coefficient is much greater than that of water environment.

Key words: road engineering, gradation segregation, moisture damage, moisture induced sensitivity tester, long-term effect, short-term effect, evaluation index

CLC Number: 

  • U414

Table 1

Main technical indexes of 70# asphalt"

试验项目技术要求测试结果
针入度（25 ℃，100 g，5 s）/0.1 mm60～8065
延度（5 cm/min，15 ℃）/cm≥100>100
软化点（环球法）/℃≥4650
石蜡含量（蒸馏法）/%<2.21.3
闪点（COC）/℃≥260320
60 ℃动力黏度/（Pa·s）160220
TFOT（163 ℃，5 h）质量损失率/%±0.8-0.02

Table 2

NAPA determines the technical index of segregation"

离析等级级配变化/%沥青含量变化/%空隙率变化/%
轻度级配离析1个筛孔＞50.3～0.752.5～4.5
重度级配离析4个筛孔＞15＞1.3＞6.5

Table 3

Grading and volume parameters of asphalt mixture"

离析等级不同筛孔孔径（mm）下的通过率/%油石比/%空隙率/%
26.5191613.29.54.752.361.180.60.30.150.075
HF10010097837460492315.5117.55.55.51.6
LF1009386716141251814.097.04.54.42.8
D1009281675544371611.085.54.04.13.7
LC100917763483020.5149.075.53.53.65.5
HC10084655136292596.554.02.52.99.1

Fig.1

Moisture induced sensitivity tester"

Fig.2

HM-9111 model asphalt mixture seepage instrument"

Fig.3

Test flow chart"

Table 4

Moisture environmental parameters"

水环境类型水环境参数
标准试验条件与规范［24］的劈裂、马歇尔稳定度和渗水试验水环境参数一致
浸水马歇尔稳定度试验水温60 ℃、时间约48 h
冻融劈裂试验-18 ℃下冻16 h、60 ℃水中24 h
静态浸水（长期作用）参照浸水马歇尔试验的水环境，即水温60 ℃、时间48 h
MIST（短期作用）参照ASTM D7870［12］，水压0.276 MPa、温度60 ℃和作用次数3500 cycle（约3.5 h）
静态浸水+MIST（短期+长期）参照浸水马歇尔试验与ASTM D7870［12］，先“静态浸水”作用44.5 h，再“MIST”作用3500 cycle（约3.5 h），共计48 h（与静态浸水时间一致）

Fig.4

Influence of different gradation segregation grades on splitting strength"

Fig.5

Influence of segregation grades of different gradations on Marshall stability"

Table 5

Moisture permeability coefficient of asphalt mixture with different grades of segregation"

水环境类型渗水系数/（10-5cm·s-1）
HFLFDLCHC
标准试验001540321
浸水031744373
MIST041846371
浸水+MIST062049391

Fig.6

Influence of different gradation segregation grades on water permeability coefficient"

Fig.7

Recommended and standardized evaluation indexes for moisture damage resistance"

Table 6

Recommended moisture damage evaluation indexes and technical requirements"

年降雨量/mm冻融劈裂强度比/%

马歇尔残留

稳定度比/%

>1000≥75≥65
500~1000≥70≥60
250~500，<250≥65≥55

Fig.8

Correlation between recommended and standard moisture damage evaluation indexes"

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