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Volume Title: ICASGE2023

DOI: ICASGE-MAT

Mohammad Sayed Eissa ; Mohammad Sayed Eissa

Civil Engineering department . Faculty of engineering assiut University

This paper program was undertaken to study the possibility of using of some available local supplementary admixtures such blast furnace slag (BFS), metakaolin (MK), a recently developed calcined ball clay (CBC) to produce of (alkali-activated) geopolymer (GP) concrete and evaluating their effect on compressive strength development. Furthermore, its effect on durability against to sulfuric acid attack was investigated. On the other hand, commercially imported FA was also used for comparison. Five groups of GP mixtures based on abovementioned admixtures have been made and studied. First and second groups were designed to evaluate the optimal ratio of combining alkaline activator sodium silicate (NS) and sodium hydroxide (NH) solutions for activation. The third and fourth group were conducted to assess the optimum curing conditions for GC where, the room temperature was used for curing third group mixes and curing 3 hours at 70º C for fourth group mixtures. The last group was carried out to evaluate the durability performance of GP against sulfuric acid attack. The results indicated that, the optimal ratio of mixing alkaline activator NS/NH was 2.5. GP concretes based on MK alone or incorporated with FA displayed strength development higher than conventional cement. As for durability against to sulfuric acid attack it could be considered that, FA based GP performed the best. MK and CBC can be suitable for use as green geopolymer cement (advanced cement) which may have the potential to replace traditional Portland-cement to minimize CO2 foot print and assist in the transition to a green economy.

Calcined ball clay; Alkali-activated Metakaolin; Geopolymer concrete durability; Carbon Foot Print; Green Advanced Cement; eco-friendly concrete

Materials Properties and Testing (MAT)