|Table of Contents|

Test on strengthening interlayer cohesion of semirigid base asphalt pavement by interlayer treatment(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2019年04期
Page:
44-51
Research Field:
道路工程
Publishing date:

Info

Title:
Test on strengthening interlayer cohesion of semirigid base asphalt pavement by interlayer treatment
Author(s):
CHEN Shibin1;  YUAN Yongqiang1;  YAO Yunshi1; 2;  GAO Feng1;  ZHANG Liangqi2
(1. 〖JP2〗Key Laboratory of Road Construction Technology and Equipment, Ministry of Education, Changan University,〖JP〗 Xian 710064, Shaanxi, China; 2. Henan Wanli Transportation Science & Technology Group Co., Ltd., Xuchang 461000, Henan, China)
Keywords:
road engineering;  semirigid asphalt pavement;  base treatment;  bonding force;  pits
PACS:
-
DOI:
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Abstract:
In order to improve the interlayer cohesion between cement stabilized macadam and asphalt layer in semirigid asphalt pavement, a new method of interlayer treatment by introducing regular pits on the surface of semirigid cement stabilized macadam base course was proposed. The standard size die combined with hydrostatic forming method was used to form the regular pits on base course, and the semirigid base asphalt pavement was finally formed by the die integration. The stress properties of the samples were tested by shear stress and pulling stress equipment, then the new treatment methods and traditional treatment methods were compared. The results show that the designed forming method can effectively form semirigid cement stabilized macadam base and semirigid base asphalt pavement with regular pits on the surface. The maximum interlayer shear stress of the pavement with 9 pits of diameter is 18 mm (Ф18) on the base is 5.2% higher than that of the milling process, and the maximum pulling stress is increased by 7.39%. The maximum interlayer shear stress is 41.05% higher than the base course with oil permeable layer, and the maximum pulling stress is increased by 29.51%. The maximum interlayer shear stress is 71.65% higher than that of the untreated base course, and the maximum pulling stress is increased by 80.38%. The maximum shear force of the base course with 12 pits is 22.72% higher than that of 4 pits, and the maximum pulling force is increased by 23.2%, the maximum interlayer shear force of the base course with 9 pits of Ф18 mm is 43.4% higher than that of 9 pits of Ф8 mm, and the maximum pulling stress is increased by 35.87%. Increasing size and number is equivalent to increasing friction coefficient and rivet resistance, which can improve mechanical property efficiency. With the change of the pavement temperature, the maximum shear force of the pavement treated with pits changes little, which enhances the fatigue strength of the pavement. Compared with the traditional interlayer treatment method, the semirigid cement stabilized macadam base treated by pits can effectively improve the shear strength, pulling strength and fatigue strength of the pavement under external loads. This method can provides a reference for engineering treatment of the base course. 4 tabs, 7 figs, 25 refs. 

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Last Update: 2019-07-29