Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill

Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill

The application of construction waste as an aggregate in subgrade backfilling is an important recycling option. This study analyzed a subgrade backfill material consisting of lime-fly ash construction waste mixture (LFCWM). Compaction and California bearing ratio (CBR) tests were performed on LFCWM...

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Bibliographic Details
Published in:Materials Vol. 14; no. 9; p. 2381
Main Authors: Wang, Qingbiao, Zhang, Jie, Liu, Kang, Xu, Andong, Xu, Haolin, Yang, Mingcong, Wang, Cun, Yang, Rongshuai, Bao, Guangtao, Liu, Yunfei, Hu, Zhongjing, Shi, Zhenyue
Format: Journal Article
Language:English
Published: Basel MDPI AG 03-05-2021
MDPI
Subjects:
Aggregates
Backfill
California bearing ratio
CBR value
Cement
compaction test
Concrete
Construction
Construction materials
Cost control
Demolition
Dry density
Engineering
Fly ash
LFCWM
Moisture content
Penetration tests
Performance tests
Research methodology
Road beds
Road engineering
Shear strength
Shear stress
Shear tests
Subgrades
Test methods
China
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Summary:The application of construction waste as an aggregate in subgrade backfilling is an important recycling option. This study analyzed a subgrade backfill material consisting of lime-fly ash construction waste mixture (LFCWM). Compaction and California bearing ratio (CBR) tests were performed on LFCWM under different cement-aggregate ratios (CARs, 3:7, 4:6, 5:5, 8:2). Different normal stresses (100, 200, and 300 kPa) and aggregate sizes (20%, 40%, 60%, 80% of P4.75) were also evaluated. The experimental results indicated that: (1) when the CAR was 4:6, the optimum water content and the maximum dry density reached their maximum values of 10.1% and 2.03 g/cm3, respectively, the maximum CBR value was 42.5%, and the shear strength reached its maximum value. (2) With an increase in shear displacement, the shear stress showed a rapid initial increase, then a slow decrease, and finally tended to stabilize. (3) Normal stress had a positive effect on the shear strength of the mixture. (4) When P4.75 was 40%, the shear strength of LFCWM was the maximum. The research results have been successfully applied to road engineering, providing an important reference for the application of construction waste aggregate in roadbed engineering.
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content type line 23
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14092381