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The Workability and Crack Resistance of Natural and Recycled Aggregate Mortar Based on Expansion Agent through an Environmental Study

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  • Junfang Sun

    (Dongwu Business School, Soochow University, Suzhou 215021, China)

  • Ji Chen

    (School of Rail Transportation, Soochow University, Suzhou 215131, China)

  • Xin Liao

    (Faculty of Geoscience and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
    MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Angran Tian

    (School of Rail Transportation, Soochow University, Suzhou 215131, China)

  • Jinxu Hao

    (Suzhou Municipal Administrative Projects Management Office, Suzhou 215000, China)

  • Yuchen Wang

    (Kogod School of Business, American University, Washington, DC 20016-8004, USA)

  • Qiang Tang

    (School of Rail Transportation, Soochow University, Suzhou 215131, China)

Abstract

Greenhouse gas emission has been a serious problem for decades. Due to the high energy consumption of traditional construction and building materials, recycled aggregate and other environmentally-friendly materials or recycled materials have been researched and applied. The treatment and reuse of construction and demolition waste (CDW) is a good way to reasonably distribute the renewable resources in the urban city. The recycled aggregate can be used in road engineering, geotechnical engineering and structural engineering. The combined use of natural aggregate and recycled aggregate may possess better performance in real constructions. This paper investigates the mechanical performance, micro-mechanism and CO 2 footprint assessment of NAM (natural aggregate mortar) and RAM (recycled aggregate mortar). Compressive strength test, flexural strength test, XRD and SEM, and CO 2 emission evaluation were conducted and analyzed. The results indicate that NAM depicts better compressive strength performance and RAM has higher flexural strength. The XRD and SEM patterns illustrate that the ettringite and C-S-H are the most important role in shrinkage-compensating mechanism, which is more obvious in RAM specimens. The proportion of CaO and MgO hydrated into Ca(OH) 2 and Mg(OH) 2 is also a key point of the volume expansion through the curing period. Finally, the CO 2 emission of NA is higher than RA per unit. This indicates that utilizing recycled aggregate over other conventional resources will reduce the energy consumption, and hit the mark to be environmental-friendly.

Suggested Citation

  • Junfang Sun & Ji Chen & Xin Liao & Angran Tian & Jinxu Hao & Yuchen Wang & Qiang Tang, 2021. "The Workability and Crack Resistance of Natural and Recycled Aggregate Mortar Based on Expansion Agent through an Environmental Study," Sustainability, MDPI, vol. 13(2), pages 1-12, January.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:2:p:491-:d:475894
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    References listed on IDEAS

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    2. Zhao, Rui & Zhou, Xiao & Han, Jiaojie & Liu, Chengliang, 2016. "For the sustainable performance of the carbon reduction labeling policies under an evolutionary game simulation," Technological Forecasting and Social Change, Elsevier, vol. 112(C), pages 262-274.
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    Cited by:

    1. Carlos D. A. Loureiro & Caroline F. N. Moura & Mafalda Rodrigues & Fernando C. G. Martinho & Hugo M. R. D. Silva & Joel R. M. Oliveira, 2022. "Steel Slag and Recycled Concrete Aggregates: Replacing Quarries to Supply Sustainable Materials for the Asphalt Paving Industry," Sustainability, MDPI, vol. 14(9), pages 1-31, April.
    2. Zhenwen Hu & Zhe Kong & Guisheng Cai & Qiuyi Li & Yuanxin Guo & Dunlei Su & Junzhe Liu & Shidong Zheng, 2021. "Study of the Properties of Full Component Recycled Dry-Mixed Masonry Mortar and Concrete Prepared from Construction Solid Waste," Sustainability, MDPI, vol. 13(15), pages 1-17, July.

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