Abstract
The Egyptian roads suffer from many distresses, which depends to a significant extent on the mechanical properties of the asphaltic layer. Therefore, scientists and engineers are constantly trying to improve the mechanical properties of the asphaltic mixtures. One common method of improving the performance of asphaltic mixtures is the use of different types of additives. The objective of this research is to study the effect of using chemical additives on the mechanical properties of hot mix asphalt (HMA). Three chemical additives were used. The additives were Addicrete PVS, Adibond 65 and Silica gel, that were added with different ratios of 5, 10, 15 and 20 % by the weight of optimum asphalt content in addition to the original mix. Marshall test, Indirect tensile strength test and Moisture susceptibility test were conducted on the investigated mixes. Testing results on the modified mixes were compared with the original mix. The results show that exploitation of Addicrete PVS and Silica gel at 10% content enhanced the worth of Marshall stability, Marshall stiffness, indirect tensile strength, TSR and improved the value of flow whereas decreased the value of bulk density compared to the control mix. Also, the results showed that the most effective content at that adding of Adibond 65 yielded the most effective results was 15%.
Highlights
THE most important properties of the bitumen mixture in the wearing course design is its ability to resist shoving and rutting under traffic
The results showed positive effects when using these chemicals as modifiers to the asphalt mixture.It was concluded that the optimum content for adding Addicrete PVS and Silica gel was 10% while it was 15% for adding Adibond 65
The results were unconcealed that exploitation Addicrete PVS and Silica gel at 10% content increased the stability worth of the mixture by 32.4% and 32.7% severally whereas exploitation Adibond 65 at 15% content increased the steadiness worth by 25.2% in scrutiny to the control mix
Summary
THE most important properties of the bitumen mixture in the wearing course design is its ability to resist shoving and rutting under traffic. Stability should be high enough to handle traffic. Kwang et al investigated the possibility of utilizing a polyester resin for reinforcing flexible pavements. The application of a thin-layer coating with a polymer, unsaturated polyester resin (UPR) on the surface of a laboratory-prepared unmodified asphalt concrete mixture was studied as a tensile reinforcement method for such material. Selected laboratory performance tests were conducted and the results were compared with those of a normal (uncoated) asphalt concrete mixture and a modified asphalt mixture. The polymer coating was found to be effective in improving Marshall Stability, tensile strength, and flexural strength of asphalt concrete (Ser. No BFEMU-2010-1064)
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