Influence of Ordinary Portland Cement and Different Alkali Solution Ratio in Geoplolymer Mortar on Time of Setting and Compressive Strength for use as A Repaired Materails
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Abstract
This research aims to study the time of setting, compressive strength, and slent shear strength of high-calcium fly ash geopolymer mortar contaimning ordinary portland cement. The high-calcium fly ash was used as binder and replaced with ordinary portland cement of 0 and 20 wt%. 10 molar sodium hydroxide solution and sodium silicate solution were used as alkali activated solution for leaching fly ash. The ratio of sodium silicate solution to sodium hydroxide solution was adjusted to 1.0, 1.5, 2.0 and 2.5 by weight. The liquid-to-binder ratio is 0.60 and the geopolymerization is not activated with high temperature. The results show ordinary portland cement and an increase in the ratio of sodium silicate solution to sodium hydroxide solution can clearly accelerate time of setting of geopolymer mortars, and the compressive strength can increase up to 66.1 MPa. In addition, it was found that the adhesion between the cement system and the geopolymer system corporated with the cement system was better than that of the cement system alone.
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