Bond strength between blended slag and Class F fly ash geopolymer concrete with steel reinforcement. (June 2015)

• Record Type: Journal Article
• Authors: Castel, Arnaud; Foster, Stephen J.
• Is Part Of: Cement and concrete research. Volume 72(2015)
• Page Start: 48
• Page End: 53
• Publication Date: 2015-06
• Subjects: Sustainability -- Geopolymer concrete -- Fly ash -- Bond strength -- Heat curing; Cement -- Periodicals; Cement -- Research -- Periodicals; Concrete -- Periodicals; Concrete -- Research -- Periodicals; Ciment -- Périodiques; Béton -- Périodiques; Cement; Concrete; Periodicals; 620.135
• DOI: 10.1016/j.cemconres.2015.02.016
• Languages: English
• ISSNs: 0008-8846

Abstract

Abstract: In this paper, geopolymer concrete bond with both deformed and smooth reinforcing steel bars is investigated using the standard RILEM pull-out test. The geopolymer binder is composed of 85.2% of low calcium fly ash and 14.8% of ground granulated blast furnace slag (GGBFS). The tests were aimed to assess the development of the bond strength from 24 h to 28 days after casting, with different heat curing conditions. The results show that 48 h of heat curing at 80 °C is required in order to obtain similar or better performances to those of the reference 45 MPa OPC concrete. The 28-day bond strength and the overall bond stress–slip behaviour of the geopolymer concrete were similar to those previously reported for OPC-based concretes. Providing intensive heat curing, high early bond strength can be achieved showing that Class F fly ash geopolymer concrete is well suited for precast applications.