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Performance and Microstructure of Cold Recycled Mixes Using Asphalt Emulsion with Different Contents of Cement

School of Transportation Engineering, Shenyang Jianzhu University, Shenyang 110168, China
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Materials 2019, 12(16), 2548; https://doi.org/10.3390/ma12162548
Received: 6 July 2019 / Revised: 3 August 2019 / Accepted: 5 August 2019 / Published: 10 August 2019
(This article belongs to the Special Issue Sustainability in Construction and Building Materials)
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Abstract

Cold recycled mixes using asphalt emulsion (CRME) is an economical and environmentally-friendly technology for asphalt pavement maintenance and rehabilitation. In order to determine the optimum range of cement contents, the complex interaction between cement and asphalt emulsion and the effects of cement on performance of CRME were investigated with different contents of cement. The microstructure and chemical composition of the fracture surface of CRME with different contents of cement were analyzed in this paper as well. Results show that the high-temperature stability and moisture susceptibility of CRME increased with the contents of cement increasing. The low-temperature crack resistance ability gradually increased when the content of cement is increased from 0% to 1.5%. However, it gradually decreased when the content of cement is increased from 1.5% to 4%. Cold recycled mixes had better low-temperature cracking resistance when the contents of cement were in the range from 1% to 2%. The results of microstructure and energy spectrum analysis show that the composite structure is formed by hydration products and asphalt emulsion. The study will be significant to better know the effects of cement and promote the development of CRME. View Full-Text
Keywords: reclaimed asphalt pavement; cold recycled mixes; asphalt emulsion; performance; microstructure reclaimed asphalt pavement; cold recycled mixes; asphalt emulsion; performance; microstructure
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Yang, Y.; Yang, Y.; Qian, B. Performance and Microstructure of Cold Recycled Mixes Using Asphalt Emulsion with Different Contents of Cement. Materials 2019, 12, 2548.

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