Effect of Healing Agents on Crack Healing of Asphalt and Asphalt Mortar

被引：19

作者：

Pan, Changluan ^{[1
]}

Tang, Ping ^{[1
]}

Riara, Martin ^{[1
,2
]}

Mo, Liantong ^{[1
]}

Li, Mingliang ^{[3
]}

Guo, Meng ^{[4
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China

[2] South Eastern Kenya Univ, Dept Phys & Elect, Kitui 17090200, Kenya

[3] Highway Minist Transport, Res Inst, Beijing 100088, Peoples R China

[4] Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China

来源：

MATERIALS | 2018年 / 11卷 / 08期

基金：

中国国家自然科学基金;

关键词：

asphalt; asphalt mortar; healing agents; crack healing; healing model; CALCIUM-ALGINATE CAPSULES; MICROWAVE-RADIATION; MIXTURES; REJUVENATOR; CONCRETE; PERFORMANCE; PAVEMENT; MOISTURE; FIBERS; HOT;

D O I：

10.3390/ma11081373

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This study investigated the effect of seven healing agents on crack healing ability of long-term aged asphalt and its mortar. Different healing agents including sunflower oil, aromatic oil, bitumen emulsion, and maltene-based emulsions were used. The crack healing of asphalt made use of two asphalt disk samples and healing was evaluated using direct tensile tests. For asphalt mortar, notched semi-circular samples were used. Test results indicated that the crack healing of asphalt and its mortar depended strongly on the type of healing agent. In general, asphalt healed faster than its mortar. Asphalt healing could be well improved by using oil agents, while asphalt mortar could be well healed with maltene-based emulsions. The crack healing of asphalt mortar developed rapidly followed by a steady state of increase. Initial crack healing using healing agents could be contributed by the diffusion and softening effects, which resulted in low strength recovery. Long term healing could lead to the bonding reconstitution in the cracks, which were decisive for the final strength gain. The promising healing agent should be able to achieve maximum strength recovery to resist cracking as well as a sufficient re-healing ability to deal with crack opening and closing.

引用

页数：18

共 44 条

[1]

AASHTO, 2015, Standard method for determining the fracture energy of asphalt mixtures using the semi circular bend geometry (SCB)

[2] Self-healing of asphalt mastic by the action of polymeric capsules containing rejuvenators [J].