Work

Cold-bonded Class-F fly ash aggregate and its application in pervious concrete: An experimental study on effect of single particle gradation

Year: 2025

Type: article

Abstract: Two single particle gradations were employed to investigate the effect on engineering properties of cold-bonded fly ash aggregate (CBA) in comparison with those of crushed stone (CS) applied in pervious concrete. Cold-bonded fly ash aggregate having two distinct gradations (5–10 mm and 10–12.5 mm) was fabricated from 85% Class-F fly ash, 15% Portland cement, and a water-to-cementitious materials ratio of 20% by using a pelletizer machine and cured in 1-d air, following by fully immersed in 6-d water at 27 ± 2 o C before testing the engineering properties. Engineering properties of pervious concretes with two single-graded CBAs as total CS replacements were examined. Experimental results showed that CBA had inferior engineering properties to CS, resulting in the lower engineering properties of pervious concretes using CBA than those of concretes using CS, regardless of particle gradations. The single particle gradations had minor effect on specific gravity and significant changes in bulk density, water absorption, and crushing value of both CS and CBA. The use of 10–12.5-mm aggregates improved compressive strength by 49.00–61.15% and flexural strength by 7.10–20.09%, and decreased permeability coefficient by 30.84–34.24% of pervious concretes, resulting from the reductions of porosity by 5.93–6.24% and connected void volume by 6.26–15.88%, when compared with that of 5–10-mm aggregates, irrespective of aggregate types. The effect of single particle gradations on the density of pervious concretes was negligible. Consequently, the single particle gradations remarkably affected the engineering properties of CBA and further the performance of pervious concretes using CBA.

Source: Case Studies in Construction Materials

DOI: 10.1016/j.cscm.2025.e05231

Authors: Phuong Trinh Bui, Hoang Ngan Anh Nguyen, Ngoc Duy Vo, Thanh Long Tran, Quang Truong Nguyen

Institutions: Vietnam National University Ho Chi Minh City, Ho Chi Minh City University of Technology

Language: English

Topic: Concrete and Cement Materials Research

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,660

Funders: Fakulta Stavební, Vysoké Učení Technické v Brně, Ho Chi Minh City University of Technology and Education, University of Science Ho Chi Minh City