Early Strength of Cold Recycled Emulsified Asphalt Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 5
Abstract
In order to study the influence of different factors on the early strength of the cold recycled emulsified asphalt mixtures, 16 different types of cold recycled mixtures were designed and produced, which were combined with different cement content, water content, and cement-water ratio. The indirect tensile strength (IDT), compressive strength (UCS), tensile strength at 15°C (TS), and indirect tensile strength ratio (ITSR) tests were used to test the early strength of the cold recycled mixture. The variance analysis method was utilized to analyze the influence of the single factor on the early strength of the cold recycled mixture. The results show that appropriate cement-water ratio content can effectively improve the early strength of cold recycled mixtures. According to the Spearman correlation coefficient and comparison of each evaluation indicator, IDT and ITSR are significantly affected by various factors, and the results are relatively stable and well-differentiated, which is recommended as indicators of early strength evaluation. Cement-water ratio is recommended as the main control factor to control the early strength of the cold recycled emulsified asphalt mixtures. The optimal cement-water ratio ranges from 0.6 to 1.0, while the cement content is controlled from 1.2% to 1.5% and the water content from 3.8% to 4.3%. This study is of great significance for promoting the design of emulsified asphalt cold regenerative mixture with cement-water ratio and improving and accelerating its early strength development.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This study is sponsored by the National Key R&D Program of China (2021YFB2601200), National Natural Science Foundation of China (51778038 and 52078025), Beijing Natural Science Foundation (KZ201910016017), the Program for Changjiang Scholars and Innovative Research Team in Universities (IRT-17R06), BUCEA Doctor Graduate Scientific Research Ability Improvement Project (DG2022010), China highway engineering consulting corporation (YFZX-2019-06), BUCEA Post Graduate Innovation Project (PG2021042), and Research Capacity Enhancement Program for Young Teachers of BUCEA (X21065).
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Received: Apr 5, 2022
Accepted: Sep 6, 2022
Published online: Feb 28, 2023
Published in print: May 1, 2023
Discussion open until: Jul 28, 2023
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