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Mechanical properties of emulsified recycled cement-stabilized macadam based on step-by-step filling gradation design

Since the recycling of waste original cement-stabilized macadam (OCSM) base has important environmental and economic significance, the addition of emulsified asphalt to OCSM to form emulsified recycled OCSM (ER-OCSM) can improve the flexibility of recycled mixtures. However, the influence of emulsif...

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Detalles Bibliográficos
Autores principales: Liu, Zhijun, Li, Chenhui, Sun, Tao, Wang, Liangliang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9094568/
https://www.ncbi.nlm.nih.gov/pubmed/35544517
http://dx.doi.org/10.1371/journal.pone.0268105
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author Liu, Zhijun
Li, Chenhui
Sun, Tao
Wang, Liangliang
author_facet Liu, Zhijun
Li, Chenhui
Sun, Tao
Wang, Liangliang
author_sort Liu, Zhijun
collection PubMed
description Since the recycling of waste original cement-stabilized macadam (OCSM) base has important environmental and economic significance, the addition of emulsified asphalt to OCSM to form emulsified recycled OCSM (ER-OCSM) can improve the flexibility of recycled mixtures. However, the influence of emulsified asphalt on the mechanical performance of such mixtures remains to be investigated. This study presents a gradation design and ER-OCSM established using the step-by-step filling method and investigated the mechanical properties of the ER-OCSM mixture. The apparent characteristics, crushing value and needle-like particle content of the OCSM milling material were tested. Based on step-by-step filling theory, the appropriate test method to achieve a uniform and dense state according to the characteristics of different aggregates was selected, and the dense skeleton gradation design method for recycled cement macadam was obtained. The mechanical properties of the ER-OCSM were analyzed by performing indoor physical laboratory tests. The natural gradation of the OCSM milling material exceeded the gradation range recommended in the Technical Guide for the Promotion of Science and Technology of the Construction Project of the Main Highway in Jiangsu Province (Trial), but the designed gradations were basically within the range. At the same age and temperature, the flexural strength and dynamic elastic modulus of the ER-OCSM decreased gradually with an increase in the emulsified asphalt content. Because ER-OCSM had temperature-sensitive characteristics, the adhesiveness of the asphalt between particles in the mixture decreased with increasing temperature, which was manifested as the unconfined compressive strength, flexural tensile strength and dynamic elastic modulus decreasing with an increase in temperature (the decrease was slight within 5–25°C but noticeable within 25–60°C). Furthermore, a higher emulsified asphalt content caused a more noticeable decrease. The flexural strength of the tested ER-OCSM showed noticeable correlations with the splitting strength, unconfined compressive strength and dynamic elastic modulus. The proper addition of emulsified asphalt can reduce the rigidity of ER-OCSM. However, the emulsified asphalt content should be strictly controlled; otherwise, the mechanical properties of the material will decrease greatly, adversely impacting the comprehensive road use performance.
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spelling pubmed-90945682022-05-12 Mechanical properties of emulsified recycled cement-stabilized macadam based on step-by-step filling gradation design Liu, Zhijun Li, Chenhui Sun, Tao Wang, Liangliang PLoS One Research Article Since the recycling of waste original cement-stabilized macadam (OCSM) base has important environmental and economic significance, the addition of emulsified asphalt to OCSM to form emulsified recycled OCSM (ER-OCSM) can improve the flexibility of recycled mixtures. However, the influence of emulsified asphalt on the mechanical performance of such mixtures remains to be investigated. This study presents a gradation design and ER-OCSM established using the step-by-step filling method and investigated the mechanical properties of the ER-OCSM mixture. The apparent characteristics, crushing value and needle-like particle content of the OCSM milling material were tested. Based on step-by-step filling theory, the appropriate test method to achieve a uniform and dense state according to the characteristics of different aggregates was selected, and the dense skeleton gradation design method for recycled cement macadam was obtained. The mechanical properties of the ER-OCSM were analyzed by performing indoor physical laboratory tests. The natural gradation of the OCSM milling material exceeded the gradation range recommended in the Technical Guide for the Promotion of Science and Technology of the Construction Project of the Main Highway in Jiangsu Province (Trial), but the designed gradations were basically within the range. At the same age and temperature, the flexural strength and dynamic elastic modulus of the ER-OCSM decreased gradually with an increase in the emulsified asphalt content. Because ER-OCSM had temperature-sensitive characteristics, the adhesiveness of the asphalt between particles in the mixture decreased with increasing temperature, which was manifested as the unconfined compressive strength, flexural tensile strength and dynamic elastic modulus decreasing with an increase in temperature (the decrease was slight within 5–25°C but noticeable within 25–60°C). Furthermore, a higher emulsified asphalt content caused a more noticeable decrease. The flexural strength of the tested ER-OCSM showed noticeable correlations with the splitting strength, unconfined compressive strength and dynamic elastic modulus. The proper addition of emulsified asphalt can reduce the rigidity of ER-OCSM. However, the emulsified asphalt content should be strictly controlled; otherwise, the mechanical properties of the material will decrease greatly, adversely impacting the comprehensive road use performance. Public Library of Science 2022-05-11 /pmc/articles/PMC9094568/ /pubmed/35544517 http://dx.doi.org/10.1371/journal.pone.0268105 Text en © 2022 Liu et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Liu, Zhijun
Li, Chenhui
Sun, Tao
Wang, Liangliang
Mechanical properties of emulsified recycled cement-stabilized macadam based on step-by-step filling gradation design
title Mechanical properties of emulsified recycled cement-stabilized macadam based on step-by-step filling gradation design
title_full Mechanical properties of emulsified recycled cement-stabilized macadam based on step-by-step filling gradation design
title_fullStr Mechanical properties of emulsified recycled cement-stabilized macadam based on step-by-step filling gradation design
title_full_unstemmed Mechanical properties of emulsified recycled cement-stabilized macadam based on step-by-step filling gradation design
title_short Mechanical properties of emulsified recycled cement-stabilized macadam based on step-by-step filling gradation design
title_sort mechanical properties of emulsified recycled cement-stabilized macadam based on step-by-step filling gradation design
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9094568/
https://www.ncbi.nlm.nih.gov/pubmed/35544517
http://dx.doi.org/10.1371/journal.pone.0268105
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