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Advances in Civil and Architectural Engineering, Vol. 15 No. 28, 2024.

Original scientific paper

https://doi.org/10.13167/2024.28.8

Recycled concrete aggregate and cinder gravel as base course construction materials

Atnafu Sahile ; Kaffa Zone Transport & Road Building Department, Kaffa, Bonga, Ethiopia
Elmer C. Agon ; Jimma University; Faculty of Civil and Environmental Engineering, Jimma, Ethiopia
Anteneh Geremew ; Jimma University; Faculty of Civil and Environmental Engineering, Jimma, Ethiopia *
Oluma Gudina ; Jimma University; Faculty of Civil and Environmental Engineering, Jimma, Ethiopia

* Corresponding author.

Full text: english PDF 691 Kb

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Abstract

In this research, the potential use of recycled concrete aggregate (RCA) and CG as a base course construction material was investigated. A laboratory test involving the mechanical stabilization of RCA and CG was conducted to examine their physical properties. Eight samples of RCA blended with CG in varying proportions from 0% to 100 % with 10 % variation were studied. The laboratory test results indicate that 100 % CG yields specific gravity (SG), aggregate crushing value (ACV), aggregate impact value (AIV), Los Angeles abrasion (LAA), flakiness index (FI), elongation index (EI), plasticity index (PI), water absorption, soundness, and California bearing ratio (CBR) values of 2,54 %, 38,37 %, 20,10 %, 33,17 %, 5,59 %, 12,09 %, 0,90 %, 3,52 %, 10,60 %, and 38,08 %, respectively. The results for 100% RCA show SG, ACV, AIV, LAA, FI, EI, PI, water absorption, soundness, and CBR values of 2,70 %, 9,56 %, 5,30 %, 9,20 %, 15,30 %, 15,84 %, NP, 0,23 %, 1,49 %, and 105,87 %, respectively. These results also fail to meet the gradation requirements based on ERA standard specifications. Therefore, mechanical stabilization was adopted to improve the physical properties of the samples. Blending 60 % RCA with 40 % CG resulted in SG, ACV, AIV, LAA, FI, EI, PI, water absorption, soundness, and CBR values of 2,65 %, 19,46 %, 10,70 %, 10,88 %, 16,15 %, 22,01 %, NP, 0,26 %, 2,09 %, and 101,98 %, respectively. At this proportion, the gradation aligns with the required ERA standard specifications for GB2 and GB3 materials. Therefore, CG up to 40 % by weight with 60 % RCA is viable for road base course construction, especially when readily available or nearby.

Keywords

recycled concrete aggregate; cinder gravel; marginal materials; natural aggregate; base course; CBR

Hrčak ID:

317580

URI

https://hrcak.srce.hr/317580

Publication date:

3.6.2024.

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