Volume 25 Issue 2
Apr.  2025
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YANG Tao, XIAO Yuan-jie, WANG Xiao-ming, CHEN Yu-liang, MENG Fan-wei, HE Qing-yu, YANG Jian-xiong. Performance and whole life cycle environmental impact assessment of cement-stabilized permeable recycled aggregate subgrade[J]. Journal of Traffic and Transportation Engineering, 2025, 25(2): 322-339. doi: 10.19818/j.cnki.1671-1637.2025.02.021
Citation: YANG Tao, XIAO Yuan-jie, WANG Xiao-ming, CHEN Yu-liang, MENG Fan-wei, HE Qing-yu, YANG Jian-xiong. Performance and whole life cycle environmental impact assessment of cement-stabilized permeable recycled aggregate subgrade[J]. Journal of Traffic and Transportation Engineering, 2025, 25(2): 322-339. doi: 10.19818/j.cnki.1671-1637.2025.02.021
shu

Performance and whole life cycle environmental impact assessment of cement-stabilized permeable recycled aggregate subgrade

doi: 10.19818/j.cnki.1671-1637.2025.02.021
  • 1.

    School of Civil Engineering, Central South University, Changsha 410075, Hunan, China

  • 2.

    MOE Key Laboratory of Engineering Structures of Heavy Haul Railway, Central South University, Changsha 410075, Hunan, China

  • 3.

    Hunan Communications Research Institute Co., Ltd., Changsha 410114, Hunan, China

  • 4.

    Sichuan Panxi Expressway Co., Ltd., Xichang 610041, Sichuan, China

Funds:

National Natural Science Foundation of China 52178443

National Key R&D Program of China 2023YFC3807205

Hunan Provincial Natural Science Fund for Distinguished Young Scholars 2024JJ2073

Key Research and Development Program of Hunan Province 2024AQ2010

Fundamental Research Funds for the Central Universities 2024ZZTS0109

More Information
  • Corresponding author: XIAO Yuan-jie (1984-), male, professor, PhD, yjxiao@csu.edu.cn
  • Received Date: 2024-03-28
  • Publish Date: 2025-04-28
    Abstract
  • To promote the widespread application of recycled aggregates derived from building demolition wastes (BDWs) in road engineering, a whole life cycle assessment method was applied. The cost and environmental impacts of the blending proportions of recycled aggregates and auxiliary cementitious materials on cement-stabilized permeable recycled aggregate (CPRA) during the four stages of raw material production, engineering construction, road maintenance, and service completion were further analyzed. In combination with laboratory compressive strength, permeability coefficient, four-point bending test, freezing resistance test, and compression resilience tests, the CPRA was compared with the traditional cement-stabilized aggregate (TCSA) subgrade materials from multi-performance and multi-dimensional perspectives. Research results show that the compressive strength and permeability coefficient can meet the requirements of China's road standards when the CPRA is used with recycled aggregate partially substituted for natural aggregate. The proportion of recycled aggregate reaches 60% by optimizing the ratio of cementitious materials in the mixture. The CO2 emissions of cement-stabilized materials during raw material production account for 87%-91% of the total CO2 emissions throughout the whole life cycle. The CO2 emissions during cementitious material production account for 95% of the total CO2 emissions of raw material production. The CO2 emissions can be effectively reduced by using auxiliary cementitious materials to partially replace cement and employing recycled aggregates. Compared with the three groups of materials with 0 recycled aggregate content, the three groups of CPRA with 30% recycled aggregate content can reduce the total cost by 8%-20% and CO2 emissions by 3%-15%. The three groups of CPRA with 60% recycled aggregate content can reduce the total cost by 24%-34% and CO2 emissions by 3%-23% compared with the three groups of materials with 0 recycled aggregate content. The replacement of cement with auxiliary cementitious materials with a proportion of 10%-32% decreases the CO2 emission of the mixture by 8%-17% but increases SO2 and NOx emissions by 14%-81% and 21%-106%, respectively. The total cost of CPRA is lower than that of TCSA. The research indicates that when the dosage of cementitious materials is controlled within the range of 7%-8%, the CPRA demonstrates superior whole life cycle carbon emission performance. The research findings will provide a reference for the application of recycled aggregates from BDWs in fully permeable subgrade as well as the measurement of carbon emission data and the design of material ratios.

     

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