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Published on: February 21, 2017
Utilization of Tunnel Waste Slag for Cement-Stabilized Base Layers in Highway Engineering
Junshuang Deng1,2, Yongsheng Yao2, Chao Huang3
1Jiangxi Transportation Engineering Group Co., Ltd., Nanchang 330038, China.
Tunnel waste slag shows promise as a sustainable aggregate for cement-stabilized highway base courses. This study confirms its physical and mechanical properties are suitable for construction applications.
Area of Science:
- Civil Engineering
- Materials Science
- Geotechnical Engineering
Background:
- Highway infrastructure expansion in China generates significant tunnel waste slag.
- A shortage of natural aggregates necessitates sustainable alternatives for highway construction.
Purpose of the Study:
- Evaluate the physical and mechanical properties of tunnel waste slag.
- Explore its potential use in cement-stabilized base courses for highway engineering.
Main Methods:
- Assessed uniaxial compressive strength of parent rock (tunnel waste slag).
- Determined optimal moisture content and maximum dry density for cement-stabilized mixtures.
- Evaluated splitting tensile strength and unconfined compressive strength of the mixtures over time.
Main Results:
- Parent rock strength ranged from 81-89 MPa.
- Optimal moisture content was 5.4% with a maximum dry density of 2.432 g/cm³.
- 28-day splitting tensile strength was 0.48-0.73 MPa; unconfined compressive strength increased from 7.0 MPa (7 days) to 11.0 MPa (90 days).
Conclusions:
- Tunnel waste slag is a viable material for cement-stabilized aggregate base courses.
- Results provide valuable data for highway engineering design and construction.
- Supports sustainable construction practices by utilizing recycled tunnel waste slag.
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