Development Of Novel Rubber Based Pavement And Application Of Hybrid Modified Scrap Rubber Powder

The rubbers which adopted Natural Rubber (NR), Styrene Butadiene Rubber (SBR) and Butadiene Rubber (BR) as matrix material were studied in the article in order to research the mechanical performance at different conditions, friction performance, abrasion performance and flame retardance property. Through comparing with traditional pavement materials in terms of these properties, it was verified the feasibility of adopting rubber as pavement material. To further outstanding the advantages of rubber based pavement, the article explored the light-colored rubber dopted silica and French chalk, and the heavy-colored rubber dopted carbon black and argil. Through testing vulcanization characteristic, mechanical performance and abrasion performance of the samples, the results as follow: Although the mechanical performance and processing property of the light-colored rubber adding silica with French chalk were not as good as the heavy-colored rubber adding the carbon black with argil, it could be used as colorful pavement material with the excellent balance of cost-effective and general performance , which could also realize green environmental protection. Through reducing the dosage of the filling system and the reinforcing system to increase the percent of the rubber in the formula, the tensile performance and abrasion performance were significantly enhanced under the premise of less cost increase, so the approach achieved the optimized combination of cost and general performance.To strengthen the advantages of rubber based pavement, the article mixed the matrix rubber with the rubber powder (RP), which was hybrid modified via sol-gel method. In situ generation of nano-particles in RP's surface effectively achieved the mechanical properties'enhance of rubber containing RP. The high performance rubber containing RP was obtained through adding silane coupling agent (TESPT), by which way the strong interfacial bonding between rubber and RP was enhanced. The experimental results showed as follow: Fourier transform infrared spectroscopy (FT-IR) and thermo gravimetric analysis (TGA) results showed that Si-O-Si networks had been in the surface of RP particles by the modification. RP was hybrid modified at best by acid catalyst while adopting NR70/SBR30 as matrix rubber and 1:1as the quality ratio of matrix rubber and RP were optimized rubber formulation. Through modifying RP with different particle size by the above mentioned approach, it was found that the mechanical performance of rubber containing the modified RP was substantially enhanced. After modification, the tensile strength improved by 114.4% at most while the tear strength improved by 60.3% at most. What's more, the tensile elongation at break and shore hardness were constant after modification. The rubber containing modified RP had good corrosion-resistant performance in outdoor environment, which was validated by environmental simulation aging test. The rubber containing 40 mesh meridian tyres powder modified via sol-gel method was carried out with the best combination of cost-effective and mechanical performance, whose tensile strength improved by 91.4% and tear strength improved by 60.3% than rubber with unmodified RP. So such rubber containing modified RP has great potential in developing as novel pavement material.