Evaluate the bonding strength performance between lightweight concrete and lightweight engineered cementitious composite using different percentages of cenosphere and hybrid fibers

Al-Baghdadi, HM, Kadhum, MM and Shubbar, A (2025) Evaluate the bonding strength performance between lightweight concrete and lightweight engineered cementitious composite using different percentages of cenosphere and hybrid fibers. Journal of Building Pathology and Rehabilitation, 10 (2). ISSN 2365-3159

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Abstract

The objective of this research is to investigate the bond performance of high-strength lightweight concrete (HLWC) substrate and lightweight engineered cementitious composites (LECC) used as overlay repair materials with varying amounts (0%, 30%, 70%, and 90%) of fly ash cenosphere (FAC) as a replacement of sand with different surface roughness conditions (as-cast surface and grooved surface). In the preparation of the LECC mixtures, a novel combination of polyvinyl alcohol (PVA) and glass fibers (GF) was used. Mechanical properties such as compressive strength, flexural strength, and density of the HLWC and LECC were tested. Additionally, the bond strength at the interface between the HLWC substrate and the LECC was evaluated by conducting both the slant shear test and the direct shear test (bi-surface) at the age of 28 days. Results indicated that replacing the sand with 70% FAC reduced the density of the LECC by about 35% and improved the specific strength ratio by about 8.6% relative to the mixture with 0% FAC. Results also showed that for both tests (slant shear and bi-surface shear), maximum bond strength was recorded for the grooved surface. For the grooved surface under the slant shear test, replacing the sand with 30% and 70% FAC provided a bond strength of 21.85 MPa and 18.35 MPa, respectively. For bi-surface shear, replacing the sand with 30% and 70% FAC showed a bond strength of 13.85 MPa and 10.3 MPa, respectively. This research reported on the production of a repair material with comparable strength, a high specific strength ratio, and an outstanding strength-to-weight reduction ratio, making it the perfect option for repair applications where durability and load-bearing capability are essential.

Item Type:	Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Civil Engineering and Built Environment
Publisher:	Springer
Date of acceptance:	3 June 2025
Date of first compliant Open Access:	23 June 2025
Date Deposited:	23 Jun 2025 14:58
Last Modified:	23 Jun 2025 15:00
DOI or ID number:	10.1007/s41024-025-00643-3
URI:	https://researchonline.ljmu.ac.uk/id/eprint/26634

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