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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 53093 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Sabouri, Mohammad Reza
- Abstract:
- This study aims to investigate the mechanical properties and performance of cold recycled asphalt mixtures (CRM). So far, several methods have been proposed for designing CRMs, which are mostly based on the volumetric and mechanical properties of the mixtures. In the meantime, few researches have considered performance of those mixes. The main approach of current research is to evaluate and enhance performance characteristics of CRMs regarding common distresses including early-raveling, moisture damage, fatigue cracking by an appropriate additive.Raveling and Cantabro tests were employed to evaluate the resistance of CRM against abrasion and semicircular bending test (SCB) and crack tolerate index (CTIndex) were used to evaluate the resistance of the mixture regarding crack propagation at the intermediate temperature and tensile strength ratio (TSR) and retained Marshall stability tests were also conducted to evaluate moisture sensitivity. Marshall and Indirect Tensile (IDT) test were also used to evaluate the mechanical properties of CRM.Styren-Butadine-Rubber (SBR)-based latex and Portland cement (type III) were utilized to enhance the engineering properties of mixtures. The results show that the use of cement can significantly improve the mechanical properties of the mixtures and enhance its resistance against moisture damage. Also, the use of modified emulsion bitumen improves the moisture indices (tensile strength ratio and retained marshall) while deteriorates the dry indirect tensile strength. It was also shown that when cement presents, the indirect tensile strength of the conditioned samples are similar regardless of the water content.As a general conclusion, not only does the combined use of these additives (Portland cement and modified emulsion) lowers the bitumen emulsion consumption, but it also can maintain the performance and the mechanical properties of the mixture. Moreover, the economical analysis revealed that agencies can save money by introducing cement into the cold recycling mixtures and subsequently, reducing the emulsion content
- Keywords:
- Cold Mix Asphalt ; Asphalt Emulsion ; Performance Evaluation ; Cold Recycling ; Styrene-Butadiene Rubber (SBR) ; Tensile Strength ; Reclaimed Asphalt Pavement (RAP)
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