Scholarlink

<p>Bituminous concrete mixes are durable but prone to aging, rutting, and cracking under extreme conditions. Adding natural or crumb rubber can enhance bitumen’s performance, though comparative studies on their effects are limited. This study compares the performance of bituminous concrete mixes using artificial rubber in the form of crumb rubber and natural rubber in the form of latex-modified bitumen. Various percentages, ranging from 5 to 15%, of crumb and natural rubber were blended into VG 30 bitumen to prepare modified binders. The effects on the physical properties and the changes in the rheological behaviour of the modified binders, combined with different percentages of crumb rubber and natural rubber, were evaluated. The complex modulus and phase angle of virgin bitumen and modified bitumen with crumb rubber and natural rubber at percentages of 5%, 7.5%, 10%, 12.5%, and 15% were determined at different temperatures: 58&#xa0;°C, 64&#xa0;°C, 70&#xa0;°C, 76&#xa0;°C, and 82&#xa0;°C. It was observed that the complex modulus increased with higher modifier content while the phase angle decreased. This indicates that crumb and natural rubber-modified binders exhibited greater stiffness (higher complex modulus) and elasticity (lower phase angle). The strength performance of the prepared bituminous concrete mixes using crumb rubber and natural rubber-modified binders was evaluated through various tests, including Marshall Stability, Indirect Tensile Strength, moisture susceptibility, Indirect Tensile Fatigue Test, and Wheel Tracking Tests. The Marshall Stability value of bituminous mixes containing 10% crumb rubber and 7.5% natural rubber was found to be 53.67% and 46% higher, respectively, compared to mixes with virgin bitumen. The Indirect Tensile Strength of the mixes increased with higher modifier content, and resistance to moisture susceptibility also improved with the use of modified binders. The Indirect Tensile Fatigue Test results showed enhanced fatigue resistance in the bituminous concrete mixes containing crumb and natural rubber. Additionally, the rut depth of the bituminous concrete mixes decreased by 53.75% and 46.9% with the inclusion of 10% crumb rubber and 7.5% natural rubber, respectively. In conclusion, the study demonstrated that the bituminous concrete mixes containing crumb rubber-modified bitumen and natural rubber-modified bitumen outperformed those prepared with virgin bitumen.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Performance of Bituminous Concrete Mixes Containing Natural and Artificial Rubber Modified Binders

  • 期刊论文

  • 发表日期：

    2025年2月15日

查看全文
  • Mitali Saharia,
  • Kh. Lakshman Singh

摘要

Bituminous concrete mixes are durable but prone to aging, rutting, and cracking under extreme conditions. Adding natural or crumb rubber can enhance bitumen’s performance, though comparative studies on their effects are limited. This study compares the performance of bituminous concrete mixes using artificial rubber in the form of crumb rubber and natural rubber in the form of latex-modified bitumen. Various percentages, ranging from 5 to 15%, of crumb and natural rubber were blended into VG 30 bitumen to prepare modified binders. The effects on the physical properties and the changes in the rheological behaviour of the modified binders, combined with different percentages of crumb rubber and natural rubber, were evaluated. The complex modulus and phase angle of virgin bitumen and modified bitumen with crumb rubber and natural rubber at percentages of 5%, 7.5%, 10%, 12.5%, and 15% were determined at different temperatures: 58 °C, 64 °C, 70 °C, 76 °C, and 82 °C. It was observed that the complex modulus increased with higher modifier content while the phase angle decreased. This indicates that crumb and natural rubber-modified binders exhibited greater stiffness (higher complex modulus) and elasticity (lower phase angle). The strength performance of the prepared bituminous concrete mixes using crumb rubber and natural rubber-modified binders was evaluated through various tests, including Marshall Stability, Indirect Tensile Strength, moisture susceptibility, Indirect Tensile Fatigue Test, and Wheel Tracking Tests. The Marshall Stability value of bituminous mixes containing 10% crumb rubber and 7.5% natural rubber was found to be 53.67% and 46% higher, respectively, compared to mixes with virgin bitumen. The Indirect Tensile Strength of the mixes increased with higher modifier content, and resistance to moisture susceptibility also improved with the use of modified binders. The Indirect Tensile Fatigue Test results showed enhanced fatigue resistance in the bituminous concrete mixes containing crumb and natural rubber. Additionally, the rut depth of the bituminous concrete mixes decreased by 53.75% and 46.9% with the inclusion of 10% crumb rubber and 7.5% natural rubber, respectively. In conclusion, the study demonstrated that the bituminous concrete mixes containing crumb rubber-modified bitumen and natural rubber-modified bitumen outperformed those prepared with virgin bitumen.