Properties investigation and performance of bottom ash-based porous geopolymer as lightweight thermal insulation

Name: Soe, Paing Set

LCSH: Kasetsart University -- Theses. M.Eng. (Sustainable Energy and Resources Engineering) 2021

Classification :.LCCS: TA418.9.P6

LCSH: Kasetsart University. -- Faculty of Engineering -- Theses

LCSH: Porous materials

LCSH: Inorganic polymers

LCSH: Sustainable construction

LCSH: Lightweight materials

LCSH: Composite materials

LCSH: Coal ash

Abstract: Geopolymer is a more durable and environmentally sustainable material than the commonly used Portland cement (PC) concrete, which emits less CO2 and consumes less energy. In this study, the mechanical and thermal properties of bottom ash-based porous geopolymer as a thermal insulation material for construction using locally accessible waste material such as coal bottom ash for environmental sustainability were explored through experiments. Sodium lauryl ether sulfate (SLES) foaming agent and aluminium powder were used to generate two different types of porous geopolymer. In order to characterize porous geopolymers with different foaming agents, analytical methods such as XRD and optical microscopy for morphological analysis, as well as physical properties such as bulk density, water absorption, and total porosity along with thermal properties such as thermal conductivity, were investigated. It was found that the porous geopolymer synthesized by both Al powder and SLES foam had a significant impact on the total porosity. Increasing the amount of SLES foaming agent could enhance the porosity of porous geopolymer and its pore sizes were spherical shapes with smaller pore diameters. Besides, it was observed that increasing the amount of Al powder could also enhance the total porosity of porous geopolymer and its pore sizes were irregular shapes with larger pore diameters. In summary, the bottom ashbased porous geopolymer with 5 wt% SLES was chosen as an effective thermal insulation material since its geopolymer structures had greater surface area and smaller average pore diameter, as well as spherical pores. Moreover, it has a low bulk density (only 1.26 g/cm3 ), water absorption of 37.46%, total porosity of 53.89%, and thermal conductivity (only 0.32 W/m.K) which is comparable to the commercial clay brick product and structural insulating concrete class-II according to the Thai Industrial Standards of TIS.77-2545 (ASTM C62-97a) and RILEM (1987). Economically for porous geopolymer making, 5 wt% SLES foaming agent (0.95 USD/kg) for the product costs 0.21 USD/kg, while 0.1 wt% Al powder (85.32 USD/kg) makes the product cost 0.25 USD/kg. Therefore, SLES should be considered more reasonable to save the production cost than Al powder.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Duangrudee Chaysuwan

Role: Thesis Advisor

Created: 2021

Modified: 2025-07-20

Issued: 2025-07-20

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2564/paing-set-all.pdf

CallNumber: TA418.9.P6 .S64

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Sustainable Energy and Resources Engineering

Grantor: Kasetsart University

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