Abstract
The emissions of greenhouse gases such as carbon dioxide from the production of Ordinary Portland Cement and Blended Portland Cement have widely affected the environment with increase in infrastructure development worldwide. Secondly, due to the continuous mining of limestone for the production of cement there is also simultaneous depletion of natural resources and hardly will it last up to maximum 40 years. Hence we need to switch over to some other alternate binders for constructions purpose in future. Geopolymer Cement is one of the inventions which is produced by a polymeric chain reaction of alkali-activated alumino-silicate materials better known as alkali activator (NaOH/Na2SiO3) binders with the industrial by-product materials such as Fly Ash, Rice Husk Ash, Slag, Crusher Dust etc. and provides high compressive strength which is comparable to BPC and reduces the carbon foot print. The objective of our study is to prepare the low CO2 foot print green Geopolymer Cement which may substitute the Ordinary Portland Cement and Blended Portland Cement in future and will helpful to reduce the greenhouse effect up to some extent and takes an initiative towards the green revolution movement.
Highlights
The emission of greenhouse gases such as carbon dioxide (CO2) from Ordinary Portland Cement (OPC) and Blended Portland Cement (BPC) production have widely affected the environment with increase in infrastructure development worldwide due to which the production/ demand of OPC as binder in concrete continuously increases (Petek et al, 2014)
Geopolymer Cement (GPC) is one of the least carbon foot print cement which is mainly produced by a polymeric chain of reaction of alkaliactivated alumino-silicate mineral binder with aluminosilicate rich industrial by-products such as Fly Ash (FA)/Crusher Dust (CD)/ Blast Furnace Slag (BFS)/Granulated Blast Furnace Slag (GBFS)/Ground Granulated Blast Furnace Slag (GGBFS)/ Ultrafine Ground Granulated Blast Furnace Slag (UGGBFS) (Laskar et al, 2017 and Part et al, 2015)
The elemental analysis of the FA, GBFS, GPC and various Blended Portland Cements such as Portland Pozzolana Cement (PPC), Portland Slag Cement (PSC) and Composite Cement (CC) are carried out by X-ray Fluorescence Spectrometer to know the percentage of elements present in the respective materials and the results are given in Table. 3
Summary
The emission of greenhouse gases such as carbon dioxide (CO2) from Ordinary Portland Cement (OPC) and Blended Portland Cement (BPC) production have widely affected the environment with increase in infrastructure development worldwide due to which the production/ demand of OPC as binder in concrete continuously increases (Petek et al, 2014). The alternate binding materials, those replace the OPC/BPC should have certain criteria such as they should be ecofriendly, acceptable, readily available and cost effective. The durability and strength of the set mass needs to be as good as that from OPC or BPC. The term geopolymer was introduced nearly before two to three decades back by Davidovits (1989) and according to him geopolymers are consist of a polymeric Si–O–Al framework, having amorphous structure. They comprise of small aluminosilicate clusters with pores dispersed within a highly porous network having clusters sizes in between 5 and 10 nanometers. The alkaline solution dissolves Al3+ and Si4+ ions from the aluminosilicate rich materials, which subsequently improves compressive strength by forming sodium aluminosilicate hydrate
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