A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Latex Improvement of Recycled Asphalt Pavement
The investigation compared the performance of a single unmodified milled recycled asphalt concrete to milled asphalt concrete modified by addition of three types of rubber latex. Latex was added at 2,3,5, and 8 percent latex by weight of asphalt in the asphalt concrete. Latices used were a styrene-butadiene (SBR) a natural rubber (NR), an acrylonitrile-butadiene (NBR), and four varieties of out-of-specification SBR latices. Marshall tests, while indecisive, showed a modest improvement in properties of SBR and NR-added material at 3 and 5 percent latex. Addition of NBR latex caused deterioration in Marshall stability and flow over that of control. Repeated load tests were run using the indirect tensile test, analyzed by the VESYS program, which computes life of pavements. Repeated load tests showed improvement in asphalt concrete life when 3 and 5 percent SBR was added. Improvement was also shown by the out-of-specification SBR. Natural rubber showed no significant improvement, probably due to mixing difficulties. The addition of rubber in latex form to recycled hot-mix as a method to improve pavement characteristics shows promise, but proof of practicality is not yet adequate.
Latex Improvement of Recycled Asphalt Pavement
The investigation compared the performance of a single unmodified milled recycled asphalt concrete to milled asphalt concrete modified by addition of three types of rubber latex. Latex was added at 2,3,5, and 8 percent latex by weight of asphalt in the asphalt concrete. Latices used were a styrene-butadiene (SBR) a natural rubber (NR), an acrylonitrile-butadiene (NBR), and four varieties of out-of-specification SBR latices. Marshall tests, while indecisive, showed a modest improvement in properties of SBR and NR-added material at 3 and 5 percent latex. Addition of NBR latex caused deterioration in Marshall stability and flow over that of control. Repeated load tests were run using the indirect tensile test, analyzed by the VESYS program, which computes life of pavements. Repeated load tests showed improvement in asphalt concrete life when 3 and 5 percent SBR was added. Improvement was also shown by the out-of-specification SBR. Natural rubber showed no significant improvement, probably due to mixing difficulties. The addition of rubber in latex form to recycled hot-mix as a method to improve pavement characteristics shows promise, but proof of practicality is not yet adequate.
Latex Improvement of Recycled Asphalt Pavement
C. Drennon (author)
1982
59 pages
Report
No indication
English
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