Abstract
Geopolymers are amorphous aluminosilicate materials. Geopolymers are binders formed by alkali activation of Geopolymer Source Materials (GSM) using an alkaline activator solution. Concretes made using Geopolymer binders are excellent alternative to the Ordinary Portland Cement concretes from strength, durability, and ecological considerations. Especially, usage of industrial waste materials such as Fly Ash and Slags as GSMs considerably lower the carbon footprint of concrete and mitigate the damage due to the unscientific dumping/disposal of these materials. To use the Geopolymer concrete (GPC) for reinforced structural members, the composite action of reinforcing bars with Geopolymer concrete i.e. the bond behaviour should be well understood. This paper describes the bond behaviour of 12mm and 16mm dia. bars embedded in Fly ash and GGBS based Geopolymer concrete and conventional Portland Pozzolana cement concrete specimens investigated using the pull-out tests as per Indian Standard Code IS:2770(Part-I); the bond stresses and corresponding slips were found out. The bond stress increased with increase in compressive strength. The peak bond stress was found to be 4.3 times more than the design bond stress as per IS:456-2000. The Geopolymer concretes possess higher bond strength compared to the conventional cement concretes.
Highlights
Creating structures of modern world is quite impossible without concrete
The environment must be protected by preventing the unscientific dumping of industrial waste materials [2] such as Fly Ash (FA), Slags, Red mud etc., and in this regard, it is seen that the R&D efforts all over the world confirm that these materials have potential for converting them into binder for producing concrete
Bond stress increases with increase in compressive strength for both Geopolymer concrete (GPC) and Portland pozzolana cement concrete (PPCC). b) Bond stress in GPC is more than that of PPCC at similar strength levels
Summary
Creating structures of modern world is quite impossible without concrete. Huge structures are constructed using cement concrete, which leads to the heavy usage of Portland cement. Geopolymer concrete (GPC) utilizes Fly Ash and Blast Furnace Slag powder (generally known as GGBS), which are abundantly available as industrial waste materials as a result of the burning of coals (in Thermal Power Plants) and making of iron and steel (in Steel plants). These industrial by-products are good candidate materials [4] for creating ecofriendly binder called as geopolymers to function as cement in concretes. The bond stress versus various slip values for 12mm and 16mm diameter bars were studied and compared with geopolymer concrete and Portland pozzolana cement concrete specimens
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