Abstract
Mechanical tests were carried out to evaluate the influence and effects of fluidity and compressive strength of cement grout on semirigid asphalt pavement. An open graded asphalt skeleton was designed in order to achieve target porosity in the range of 18~22%. In addition, four types of cement grout mixtures were produced with varying mix proportions with ultrarapid hardening cement and chemical admixtures, that is, accelerating and retarding agents. For the semirigid pavement specimens, mechanical experiments to measure properties such as porosity, flexural strength, Marshall stability, and wheel tracking resistance were carried out. The test results demonstrated that the flow time (fluidity) of cement grout is the most significant factor that determines the mechanical properties of semirigid asphalt specimens under constant condition of the open graded asphalt skeleton. For the semirigid pavement mixing proportion in the current study, it is recommended that the porosity of the open graded asphalt skeleton and flow time of cement grout should be 20% and within 12 seconds, respectively.
Highlights
Asphalt and concrete pavement is the most commonly applied pavement method worldwide and is used for a variety of applications including vehicle roads and airport pavement
This paper includes the results of a laboratory investigation into the properties of void content, Marshal stability, flexural strength, and wheel tracking resistance depending on flow time and compressive strength of the cement grout mixed with ultrarapid hardening cement and chemical admixtures including accelerating agent and retarding agent
The test results show that it was possible to effectively enhance the dynamic stability and deformation rate for deformation, thereby improving the durability of asphalt pavement under repeated vehicle load. This current study investigated the effect of cement grout controlled with ultrarapid hardening cement, accelerating and retarding chemical agent on the mechanical properties of semirigid pavement
Summary
Asphalt and concrete pavement is the most commonly applied pavement method worldwide and is used for a variety of applications including vehicle roads and airport pavement. There is excellent deformation compatibility for expansion and shrinkage with both leading to lower maintenance cost than concrete pavement [3,4,5,6] These two types of pavement methods generally have opposite characteristics and are selectively applied according to environmental conditions such as external load and soil profiles. The most significant characteristic of semirigid pavement is its ability to combine the ductility of asphalt and the stiffness and strength of concrete to provide excellent running performance and durability. It can be produced with various properties depending on the characteristics of the cement grouts and the skeleton of the asphalt mixture. This paper includes the results of a laboratory investigation into the properties of void content, Marshal stability, flexural strength, and wheel tracking resistance depending on flow time and compressive strength of the cement grout mixed with ultrarapid hardening cement and chemical admixtures including accelerating agent and retarding agent
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