Advanced Modeling in Civil Engineering
Investigating the mechanical properties of activated alkali high permeability concrete according to the ratio of alkaline activators
Document Type : Original Article
Authors
1 Master of Science, Department of Civil Engineering, Faculty of Engineering, Shahrekord University, Shahrekord, Iran
2 Assistant Professor, Department of Civil Engineering, Shahrekord University,Shahrekord , Iran
3 Associate Professor, Department of Civil Engineering, Faculty of Engineering, Shahrekord University, Shahrekord, Iran
Abstract
This research investigates the mechanical properties of alkali-activated porous concrete compared to cement-based porous concrete. In this regard, the slag of blast furnaces has been used as the base material for cement, and sodium hydroxide and sodium silicate have been used as alkalizing materials. Alkali-activated porous concrete was made with 8 Molar sodium hydroxide solution with ratios of sodium hydroxide to sodium silicate 1:2, 1:1, and 2:1. To check the mechanical properties, compressive strength and tensile strength tests (Brazilian test) were tested at the ages of 90, 28, 7, and 120 days according to the proposed standards. Compared to sample concrete, the compressive strength and tensile strength of porous concrete with active alkali in the ratio of 1 to 2 have been reduced by 75 and 69 percent. The same comparison shows a decrease of 51 and 41% in the ratio of 1:1, and in the ratio of 2:1 sodium hydroxide to sodium silicate, the compressive strength increases by 28% and the tensile strength by 12% compared to porous cement-based concrete at the age of 120 days.
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