The Effects of Solid to Liquid Ratio on Fly Ash Based Lightweight Geopolymer

Abstract

Geopolymer material was used as the raw material because it promotes the green technology. In this study, lightweight geopolymer was produced using fly ash as raw material with the addition of alkali activation which is mixture of sodium silicate and sodium hydroxide, foaming agent that gives lightweight properties and finally, underwent curing process. The molarity of sodium hydroxide (NaOH) used was fixed at 12 M while the ratio of fly ash to alkali activator (solid to liquid) used were varied in the range of 2.0, 2.5, 3.0 and 3.5, by mass. Besides that, foaming agent (Polyoxyethylene alkyether Sulfate) was added to the geopolymer sample to give the lightweight properties. The samples were cured at 80 °C for 24 hours in the oven for curing process and left at room temperature prior for testing for 14 days. The testing of sample was conducted in this study which includes density test, compression strength test, water absorption test and scanning electron microstructure (SEM) test. The results obtained for optimum solid to liquid ratio is 2.5, by mass with the optimum value of compressive strength density value. The mechanical and physical properties of lightweight geopolymer were based on the ASTM International Standard.

Synthesis of Metakaolin Based Alkali Activated Materials as an Adsorbent at Different Na2SiO3/NaOH Ratios and Exposing Temperatures for Cu2+ Removal

“…Subsequently, the chemical and mineralogical composition of the raw materials, the kind of alkaline activators, their concentration, and the ratio of main chemical activators such as Na 2 O/SiO 2 , SiO 2 /Al 2 O 3 are all parameters that influence alkali activation [ 39 , 40 , 41 ]. In that sense, the main objective of this study is to study the porous distribution behaviour for heavy metal adsorption.…”

Preparation of Fly Ash-Ladle Furnace Slag Blended Geopolymer Foam via Pre-Foaming Method with Polyoxyethylene Alkyether Sulphate Incorporation

“…Several studies have been focused on the production of geopolymer foam by adopting the pre-foaming method, with the incorporation of polyoxyethylene alkyether sulphate (PAS) foaming agent. PAS is a brown liquid extracted from coconut oil, and it can be easily and quickly dissolved in water to generate foam [4]. Based on previous studies, Ibrahim et al [5] produced fly ash geopolymer foam with PAS foam-to-paste ratios ranging from 0.5 to 2.0, revealing that the compressive strength of the foamed geopolymer (17.8-4.1 MPa) decreased with increasing foam-to-paste ratio.…”

“…Based on previous studies, Ibrahim et al [5] produced fly ash geopolymer foam with PAS foam-to-paste ratios ranging from 0.5 to 2.0, revealing that the compressive strength of the foamed geopolymer (17.8-4.1 MPa) decreased with increasing foam-to-paste ratio. Mastura et al [6] and Ibrahim et al [4] produced fly ash geopolymer foam with a PAS foam-to-paste ratio of 1.0, reporting that the compressive strength of the foamed geopolymer was in the range of 9.0 MPa to 19.3 MPa. On the other hand, Tiong et al [7] also produced concrete foam using PAS foam.…”

Towards optimization of mechanical and microstructural performances of Fe-rich laterite geopolymer binders cured at room temperature by varying the activating solution

“…, metakaolin, slag, fly ash, volcanic ash and laterite) in an alkaline or acid media followed by polycondensation and polymerization steps towards the formation of a 3-D compact structure. 7,9–11 A possible reaction sequence is presented below:…”

“…7,8 Geopolymerization is a process that involves the dissolution of reactive components of the solid precursors (e.g., metakaolin, slag, y ash, volcanic ash and laterite) in an alkaline or acid media followed by polycondensation and polymerization steps towards the formation of a 3-D compact structure. 7,[9][10][11] A possible reaction sequence is presented below:…”