Technical Evaluation of Using Grouting for Producing Semi-Flexible Asphalt Concrete Mixtures.

M. Al-Taher, Professor, Public Works Engineering Department , Faculty of Engineering, Zagazig University, Egypt.
A. Mohamady, Associate professor, Public Works Engineering Department , Faculty of Engineering, Zagazig University, Egypt.
M. Attia, Lecturer , Public Works Engineering Department , Faculty of Engineering, Zagazig University, Egypt.
M. Shalaby, Assistant lecturer, Public Works Engineering Department , Faculty of Engineering, Zagazig University, Egypt.Follow

Corresponding Author

Shalaby, M.

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

A noticeable shortage was occurred in the asphalt supply in the Egyptian Market due to the increasing volume of road construction projects in the current decade, which led to importing asphalt from foreign countries. Consequently, aggravates the problem of hard currency and increasing the local asphalt prices. Another serious problem has been also observed on unlimited number of newly constructed Egyptian roads, that is the rutting distress due to the increasing of both of percentage of goods truck and axle loads accompanied by the increasing of goods transported via the Egyptian highway networks. So, finding out a solution to develop mixtures that have lower asphalt contents and high resistance to the rutting becomes essential. This study aims at characterization and design special type of asphalt mixture having lower asphalt content and of higher rutting resistance to be used in paving surface layers. To achieve this objective, grouting technique of highly permeable asphalt mixtures produced under different compacting efforts was used. Crushed limestone, crushed sand, and limestone filler were used to prepare highly permeable asphalt mixtures. Asphalt contents of these mixes were determined theoretically. Marshall moulds representing these mixes were prepared and grouted using ordinary portland cement (OPC) as well as mixtures of OPC and silica sand with different ratios. Unconfined compressive strength (UCS), Marshall Stability, and indirect tensile strength tests were conducted on these mixes to define their characteristics. The same tests were conducted on crushed limestone traditional mix of 4C gradation for comparison purposes. Analyzing the study results, the active effect of grouting technique using each of OPC as well as mixture of 1: 1 OPC and silica sand was concluded. Reduction from 35% to 44 % of the required asphaltamount and increasing of rutting resistance for highly porous mixes through increasing UCS and stability by about 3 times compared with traditional asphalt mixtures.

Keywords

Porous asphalt mixtures; Grouted Macadam; Semi-Flexible Pavement; rutting

Recommended Citation

Al-Taher, M.; Mohamady, A.; Attia, M.; and Shalaby, M. (2020) "Technical Evaluation of Using Grouting for Producing Semi-Flexible Asphalt Concrete Mixtures.," Mansoura Engineering Journal: Vol. 40 : Iss. 4 , Article 23.
Available at: https://doi.org/10.21608/bfemu.2020.102455

Download