Title: Use of Rubberized ECC in repair/strengthening lightweight concrete elements

Author(s): Basem H. AbdelAleem and Assem A. A. Hassan

Publication: Symposium Paper

Volume: 358

Issue:

Appears on pages(s): 1-20

Keywords: Rubberized engineered cementitious composites; impact resistance; drop-weight impacts; lightweight concrete; mechanical properties; Crumb rubber; powder rubber; supplementary cementing materials

DOI: 10.14359/51740228

Date: 9/1/2023

Abstract:
This study aims to present a new technology for repairing/strengthening lightweight concrete (LWC) elements. Rubberized engineered cementitious composite (RECC) was used to repair/strengthen LWC specimens to develop a lightweight composite with superior mechanical properties and impact resistance. Two different sizes of rubber aggregate were used in RECC: crumb rubber (CR) and powder rubber (PR). The studied parameters included different RECC layer thicknesses and different cross-section locations. The tested properties were compressive strength, splitting tensile strength, flexural strength, drop weight impact resistance, and flexural impact resistance. The bond strength at the interface between LWC and RECC was also investigated. The results revealed that repair/strengthening LWC with RECC layer showed a promising lightweight composite with enhanced mechanical properties and impact resistance. Using CR in the RECC repair layer showed better enhancement in the drop weight impact resistance than using PR, while using PR was more significant in enhancing the composite’s static flexural strength and flexural impact resistance. The results also revealed that the flexural impact resistance of the sample was significantly enhanced when RECC layer was placed on the tension side (bottom side), while the drop-weight impact resistance was noticeably improved when RECC was placed on the compression side (top side).