Green development of fly ash geopolymer via casting and pressing Approaches: Strength, Morphology, efflorescence and Ecological Properties

Shee-Ween, Ong; Cheng-Yong, Heah; Yun-Ming, Liew; Abdullah, Mohd Mustafa Al Bakri; Ho, Li-Ngee; Pakawanit, Phakkhananan; Khalid, Mohd Suhaimi; Muhammad, Waqas; Wan-En, Ooi; Yong-Jie, Hang; Yong-Sing, Ng; Hui-Teng, Ng

doi:10.1016/j.conbuildmat.2023.132446

Cited by 15 publications

(2 citation statements)

References 48 publications

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“…The geopolymer term was invented by Davidovits in 1972, who described them as aluminosilicate, characterised by a three-dimensional structure and formed as a result of activation by means of an alkaline solution [22,23]. Besides their environmental friendliness, geopolymers exhibit up-and-coming properties, proving the possibility of widespread prospective application [24]. Nevertheless, it should be highlighted that waste materials can be used for geopolymer production, such as construction and demolition waste [25], magnetic mining waste [26], brick waste [27], waste glass [28], and coal gangue [29].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Coal Gangue and/or Metakaolin-Based Lightweight Geopolymer with the Addition of Waste Glass

Ziejewska,

Bąk,

Hodor

et al. 2023

Materials

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Massive amounts of deposited coal gangue derived from the mining industry constitute a crucial problem that must be solved. On the other hand, common knowledge about the recycling of glass products and the reuse of waste glass is still insufficient, which in turn causes economic and environmental problems. Therefore, this work investigated lightweight geopolymer foams manufactured based on coal gangue, metakaolin, and a mix of them to evaluate the influence of such waste on the geopolymer matrix. In addition, the effect of 20% (wt.) of waste glass on the foams was determined. Mineralogical and chemical composition, thermal behaviour, thermal conductivity, compressive strength, morphology, and density of foams were investigated. Furthermore, the structure of the geopolymers was examined in detail, including pore and structure thickness, homogeneity, degree of anisotropy, porosity with division for closed and open pores, as well as distribution of additives and pores using micro-computed tomography (microCT). The results show that the incorporation of waste glass increased compressive strength by approximately 54% and 9% in the case of coal-gangue-based and metakaolin-based samples, respectively. The porosity of samples ranged from 67.3% to 58.7%, in which closed pores constituted 0.3–1.8%. Samples had homogeneous distributions of pores and additions. Furthermore, the thermal conductivity ranged from 0.080 W/(m·K) to 0.117 W/(m·K), whereas the degree of anisotropy was 0.126–0.187, indicating that the structure of foams was approximate to isotropic.

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Section: Introductionmentioning

confidence: 99%

Eco-Friendly Coal Gangue and/or Metakaolin-Based Lightweight Geopolymer with the Addition of Waste Glass

Ziejewska,

Bąk,

Hodor

et al. 2023

Materials

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“…The importance of improving environmentally responsible processes, technologies, and materials has grown due to the need to control nonrenewable natural resource consumption and reduce energy demand. Geopolymers, which are inorganic polymers obtained at near-ambient temperatures [7], have attracted increasing interest because of their reduced CO 2 emissions and lower energy consumption [8]. Geopolymers are more environmentally responsible substitutes for more standard petrochemical solutions as they are flame-retardant and insulating [9].…”

Section: Introductionmentioning

confidence: 99%

Geopolymer Made from Kaolin, Diatomite, and Rice Husk Ash for Ceiling Thermal Insulation

Alvarado,

Martínez-Cerna,

Alvarado-Quintana

2023

Buildings

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In this study, geopolymers made of metakaolin (MK), diatomite (D), and rice husk ash (RHA) were developed for ceiling thermal insulation in houses to provide protection against cold temperatures. The influence of the constituent mixing ratio and the temperature of curing on the heat conductivity and compressive strength of the geopolymer was investigated. Specimens were formed according to a 10-level mix design with three replicates and subjected to curing at 40 °C and 80 °C. Heat conductivity and compressive strength were determined in accordance with established standards. The simplex lattice method was used to obtain the response surfaces, contour plots, and tracking curves. The geopolymers under study displayed a reduction in heat conductivity and an increase in compressive strength when the curing temperature was raised. The optimal mixing ratio to achieve a balance between the compressive strength and thermal conductivity of the geopolymers investigated was 0.50 MK and 0.50 RHA. Diatomite’s thermal insulation contribution is neutralized when crystals from the geopolymer gel fill the pore volume. The mixture’s optimal results were achieved when cured at 80 °C, demonstrating a thermal conductivity of 0.10 W/m·K and a compressive strength of 5.37 MPa.

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Advancements in cleaner production of one-part geopolymers: A comprehensive review of mechanical properties, durability, and microstructure

Zareechian,

Siad,

Lachemi

et al. 2023

Construction and Building Materials

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Green development of fly ash geopolymer via casting and pressing Approaches: Strength, Morphology, efflorescence and Ecological Properties

Cited by 15 publications

References 48 publications

Eco-Friendly Coal Gangue and/or Metakaolin-Based Lightweight Geopolymer with the Addition of Waste Glass

Eco-Friendly Coal Gangue and/or Metakaolin-Based Lightweight Geopolymer with the Addition of Waste Glass

Geopolymer Made from Kaolin, Diatomite, and Rice Husk Ash for Ceiling Thermal Insulation

Advancements in cleaner production of one-part geopolymers: A comprehensive review of mechanical properties, durability, and microstructure

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