Performance Evaluation of Metakaolin Based Geopolymer Containing Parawood Ash and Oil Palm Ash Blends

Abstract

Experimental tests were used to identify the optimum mix of metakaolin (MK) geopolymer mortars needed to achieve high early compressive strength. These tests investigated compressive strength, drying shrinkage, and sodium sulfate expansion of binary and ternary MK-based geopolymer mortar samples containing Parawood ash (PWA) and oil palm ash (OPA) in different replacement levels. The following amounts of PWA and OPA were used: 10 %, 20 %, 30 % and 5 %, 10 %, 15 % by weight of MK, respectively. Sodium hydroxide, sodium silicate and a curing temperature of 80 °C for 2 h were used as parameters to activate the geopolymerization of mortars. Thirteen geopolymer mortar formulations containing PWA and OPA were prepared, and the compressive strengths at 2 h, 6 h, 24 h, 7 days and 28 days were determined. The highest compressive strength of 62 MPa, after 2 h at 80 °C and 2 h at ambient temperature, was obtained with 5 % OPA.

Prediction of Torsional Strength for Very High Early Strength Geopolymer

“…High CaO content of raw materials causes large porosity [14]. Then, the increase porosity can lead to degradation of compressive strength However, replacement of raw materials with PWA can reduce shrinkage rate of specimens (for specimens with heat curing at least 2 h) [11,15].…”

“…Modified Portland cement has been investigated at various mix proportions of PCC and latex [8,9]. Recently, high early strength geopolymers from metakaolin (MK) and Parawood ash (PWA) have been developed and evaluated for their mechanical properties by the current authors [10,11]. In Southeast Asia, Parawood is mostly used as raw material for biomass power plants.…”

“…Parawood ash (PWA) is one of residual products during the combination process of Parawood lumber and waste for electricity generation. Previous studies on the use of PWA as a material in geopolymer have still been rarely available [10,11]. The feasibility study on Metakaolin based geopolymer containing PWA and Oil palm ash was investigated to develop high early compressive strength binder [11].…”

“…Previous studies on the use of PWA as a material in geopolymer have still been rarely available [10,11]. The feasibility study on Metakaolin based geopolymer containing PWA and Oil palm ash was investigated to develop high early compressive strength binder [11]. The geopolymer samples were tested for compressive strength and drying shrinkage, and for bond strength to Portland cement mortar with slant shear test.…”

“…The geopolymer samples were tested for compressive strength and drying shrinkage, and for bond strength to Portland cement mortar with slant shear test. It was found that PWA significantly reduces drying shrinkage of test specimens [11]. Based on previous studies, knowledge concerning the mechanical properties and behaviors of geopolymer containing PWA are necessarily accomplished before field applications.…”