Document Type : Original Article
Authors
1
Civil Engineering Department, Faculty of Engineering, The British University in Egypt, Cairo, Egypt
2
University Professor in the Civil Engineering Department, Faculty of Engineering at Ain Shams University, Cairo, Egypt.
3
University Associate Professor in the Civil Engineering Department, Faculty of Engineering, The British University BUE, Cairo, Egypt
Abstract
Three groups of Alkali-Activated Slag AAS mixtures were investigated, where each group represents a water-to-binder W/B ratio of 0.35, 0.40 and 0.45, and alkali-to-binder ratio of 0.45, 0.55 and 0.65, respectively. Each group had two slag contents, 350 kg/m3 and 400 kg/m3. Silica modulus Ms of all the mixtures was fixed for all the mixtures, while Na2O ranged between 10% and 14%. The mixtures were cured by two curing methods; sealing in polyethylene bags, and a new curing method that is more practical and applicable on sites. The compressive strength of the AAS concrete mixtures was investigated at the ages from 6 hours to 91 days. Furthermore, indirect tensile and flexural strengths were also investigated at the age of 28 days, in addition to testing their modulus of elasticity. The mechanical properties of specimens cured by the new proposed curing method were lower than their counterparts which were cured by sealing. However, the difference is insignificant, especially if compared with the benefit and the applicability of the new curing method on site. The results show that the compressive strength of the mixtures at 6 hours reached up to 10 MPa, and at 28 days up to 98 MPa. The slump cone test of the mixtures reached up to 175 mm, while the indirect tensile strength and modulus of rupture reached up to 5.54 and 10.7 MPa, respectively. The modulus of elasticity of the mixtures was high on average where it ranged from 35.9 to 44.1 GPa.
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