Study on Refractory Materials Application Using Geopolymer Processing

Bakri, A.M. Mustafa Al; Liyana, J.; Kamarudin, Hussin; Bnhussain, M.; Ruzaidi, C.M.; Rafiza, A. R.; Izzat, Ahmad Mohd

doi:10.1166/asl.2013.4676

Cited by 5 publications

(3 citation statements)

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“…Except for the low-carbon emission benefit, another important merit of geopolymers is their outstanding fire-resistance performance. When concrete constructions and organic ones are exposed to a high-temperature environment, such as fires in city buildings or tunnel linings [13], sewer pipes [14] and refractory coatings [15], traditional concrete structures or organic coatings show catastrophic failure which results in massive economic loss and even endanger human lives. As a result, geopolymers can be potentially used as fire and heat resistance cementitious materials or inorganic coatings to enhance the durability and stability of concrete constructions.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution Mechanism of Geopolymers with Exposure to High-Temperature Environment

Lu¹,

Cui

Xian³

et al. 2021

Crystals

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The investigation on geopolymers has intrigued broad interests in the past decades, due to the requirements for the recycling of aluminosilicate solid wastes, such as red mud, slags, sludges and demolished concrete. Previous studies have demonstrated the feasibility of reusing this Aluminosilicate as a resource to prepare cementitious materials and indicated their promising properties at ambient temperature. However, when this material was exposed to high temperatures, especially above 1000 °C, the microstructure evolution mechanisms were not systematically investigated. In this study, the microstructural evolution process of metakaolin-based K geopolymer (molar ratio of K:Al:Si was 1:1:4) is investigated. The crystalized leucite originated from the geopolymer precursor was detected above 1000 °C. The SEM results indicate that the microstructure of the geopolymer before heating was composed of non-reacted metakaolin with a typical layered structure and reacted amorphous binder phase. As the geopolymer heated to 1000 °C, the microstructure of the geopolymer changed to a porous structure with an average pore size from 10 to 30 μm. When the heating temperature reached 1100 °C, the pores started to close along with the leucite crystallization process. As the heating temperature reached 1200 °C, most of the pores were closed. The TEM results show that the microstructure of the geopolymer, after being heated to 1400 °C, was composed of an amorphous glassy phase and crystallized leucite phase. The crystallized leucite grains originated from the nano-sized crystal nuclei, with an average size of 2–3 nm. The TEM-EDS results indicate that the chemical composition of the glassy phase was complicated. It varied from area to area because of the movement and uneven distribution of K.

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Section: Introductionmentioning

confidence: 99%

Microstructure Evolution Mechanism of Geopolymers with Exposure to High-Temperature Environment

Lu¹,

Cui

Xian³

et al. 2021

Crystals

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“…Kaolin is part of our natural sources and has properties of whiteness, fine particle size and plate-like structure, hence kaolin is suitable to use as coating source materials. Previous research has studied on fly ash and metakaolin as source materials in geopolymer coating [3][4][5] and used sodium hydroxide and sodium silicate as an alkaline activator [4][5][6][7][8]. Adhesive strength is one of the important evaluation in coating application and the highest strength obtained by previous studied using Elcometer 106 was 5.5MPa [9].…”

Section: Introductionmentioning

confidence: 99%

Adhesion Study of Kaolin and White Clay as Source Materials on Non-Metallic Substrate in Geopolymer Coating

Shahedan

Ghazali

Binhussain

et al. 2016

MSF

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Properties of geopolymer coating on nonmetallic substrates, especially glass fiber-reinforced epoxy (GRE) have been considered based on the effect of Si/Al ratio and surface treatment at a determined proportion of solid to liquid (S/L) and curing temperature.Kaolin and white clay have been used as geopolymer raw material in study of adhesive strength in geopolymer coating. Effect Si/Al ratio and surface treatment on adhesive strength has been tested from 0.40-0.60using Elcometer 106 Pull Off. The answer shows that Si/Al ratio and surface treatment were effecting the adhesive strength of geopolymer coating. The highest adhesive strength 6.0 MPa was found ina Si / Al ratio of 3.5 with surface treatment.

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“…Based on previous research [10,11], most of the studies focused on the properties and interaction between geopolymer coatings with metal substrate by used metakoalin and fly ash as the based for geopolymer. There are only few studies on geopolymer coating with non-metal substrates.…”

Section: Introductionmentioning

confidence: 99%

Study on Properties and Morphology of Kaolin Based Geopolymer Coating on Clay Substrates

Ruzaidi

Binhussain

Salwa

et al. 2013

KEM

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The application of geopolymer as a coating was not widely explored by other researchers and therefore the study of kaolin based geopolymer coating applied on different types of clay substrate (unsintered and sintered) was carried out. The geopolymer coating paste were initially prepared by mixed the kaolin with alkaline activator (NaOH and Na2SiO3) until homogeneous mixture was obtained. After that, the geopolymer paste then applied on the surface of clay substrates and left to cure at 80°C for 24 hours and sintered at 800°C respectively for 2 hours. Flexural, compression test and SEM for morphology analysis are studied. Based on the results obtained, it shows that kaolin based geopolymer coating can contribute in improving the substrate strength, while curing and sintering temperature applied to the geopolymer coating on different substrate can influence the interaction between substrate and geopolymer paste to diffuse according to SEM image proved.

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Study on Refractory Materials Application Using Geopolymer Processing

Cited by 5 publications

References 0 publications

Microstructure Evolution Mechanism of Geopolymers with Exposure to High-Temperature Environment

Microstructure Evolution Mechanism of Geopolymers with Exposure to High-Temperature Environment

Adhesion Study of Kaolin and White Clay as Source Materials on Non-Metallic Substrate in Geopolymer Coating

Study on Properties and Morphology of Kaolin Based Geopolymer Coating on Clay Substrates

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