Bond Behavior of Carbon Fabric-Reinforced Matrix Composites: Geopolymeric Matrix versus Cementitious Mortar
Open Access
- 15 May 2021
- Vol. 11 (5), 207
- https://doi.org/10.3390/buildings11050207
Abstract
This study aims to examine the potential use of a geopolymeric matrix as a sustainable alternative to commercial mortars in carbon fabric-reinforced matrix composites. Single-lap shear tests were conducted to examine the bond behavior at the fabric-matrix interface. Test parameters included the type of matrix (geopolymeric and cementitious matrices) and the bonded length (50 to 300 mm). The geopolymeric matrix was a blend of fly ash/ground granulated blast furnace slag activated by an alkaline solution of sodium silicate and sodium hydroxide. The bond behavior of the geopolymeric-matrix specimens was characterized and compared to that of similar specimens with a cementitious matrix. The specimens failed due to fabric slippage/debonding at the fabric-matrix interface or fabric rupture. The effective bond lengths of the geopolymeric- and cementitious-matrix specimens were 150 and 170 mm, respectively. The geopolymeric-matrix specimens exhibited higher fabric strains, higher ultimate loads, and a steeper strain profile along the bonded length than those of their cementitious-matrix counterparts. New bond-slip models that characterize the bond behavior at the fabric-matrix interface for geopolymeric- and cementitious-matrix specimens were developed. Both models exhibited equal maximum shear stress of 1.2 MPa. The geopolymeric-matrix model had, however, higher fracture energy and higher slip at maximum shear stress than those of the cementitious matrix model.Funding Information
- United Arab Emirates University (31N372)
This publication has 30 references indexed in Scilit:
- Effect of the inherent eccentricity in single-lap direct-shear tests of PBO FRCM-concrete jointsComposite Structures, 2016
- Mechanical properties of FRCM using carbon fabrics with different coating treatmentsComposites Part B: Engineering, 2016
- Influence of the substrate characteristics on the bond behavior of PBO FRCM-concrete jointsConstruction and Building Materials, 2015
- A comparison of the bond behavior of PBO-FRCM composites determined by double-lap and single-lap shear testsCement and Concrete Composites, 2015
- A qualification method for externally bonded Fibre Reinforced Cementitious Matrix (FRCM) strengthening systemsComposites Part B: Engineering, 2015
- Analysis of the bond between Fabric Reinforced Cementitious Mortar (FRCM) strengthening systems and concreteComposites Part B: Engineering, 2015
- Experimental and analytical investigation on bond between Carbon-FRCM materials and masonryComposites Part B: Engineering, 2013
- Bond-slip relations for PBO-FRCM materials externally bonded to concreteComposites Part B: Engineering, 2012
- Use of geopolymers for composite external reinforcement of RC membersComposites Part B: Engineering, 2012
- Development of the Nonlinear Bond Stress–Slip Model of Fiber Reinforced Plastics Sheet–Concrete Interfaces with a Simple MethodJournal of Composites for Construction, 2005