Abstract
Nowadays, the demand for lightweight building materials has been growing worldwide. This paper presents an investigation on the use of waste materials of fly ash as a source materials for the production of lightweight geopolymer by using foaming agents. The key properties for the foamed geopolymer namely density, compressive strength, and water absorption were investigated. The chemical composition of materials and morphology analysis were studied to find the microstructure properties of foamed geopolymer. The foamed geopolymer were prepared by combination of 12 M Sodium Hydroxide (NaOH) solution and Sodium Silicate (Na2SiO3) solution. The ratio of Na2SiO3/NaOH and ratio of fly ash/alkaline activator were kept constant at 2.5 and 2.0, by mass respectively. The effect of different ratio of foaming agent/water and foam/geopolymer paste were investigated at 7 days of ageing and cured at 80�C for 24 hours. In general, the results showed that the fly ash-based lightweight geopolymer has good potential as brick application.
Highlights
Nowadays, the demand for lightweight building materials has been growing worldwide
This paper presents an investigation on the use of waste materials of fly ash as a source materials for the production of lightweight geopolymer by using foaming agents
The strength of lightweight geopolymer is directly affected by the foaming agent content
Summary
F fly ash was depicted in figure 1. Surfactants or synthetic foaming agent (Polyoxyethylene Alkyether Sulfate) was used as the foaming agents and the chemical composition shown in table 2. Distilled water was used to dissolve NaOH pallet in preparation of 12 M NaOH solution. The major constituents of wfoiathm7in8g.6a0g%enatnuds1e1d.0in%t,hriesssptuedcytiv(etalyb.leTh2i)satryepSeOo3f and PdO foaming agent are called as synthetic foaming agent which are an amphiprotic substance that are strongly hydrophilic and dissolve in water yielding air bubbles [26]. The structure of original fly ash shows that the shape was nearly spherical particles with various sizes. These particles are usually consists of fine solid spherical particles (microspheres) which are contained by the large cenosphere particles (>50μm) formed during the combustion process [27]. The surface texture of fly ash are mostly smooth and some vitreous, unshaped fragments or quartz particles can be seen [28]
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