Synthesis, characterization and mechanisms of one-part geopolymeric cement by calcining low-quality kaolin with alkali

Peng, Mei Xun; Wang, Zheng Hong; Shen, Shao Hua; Xiao, Qiang

doi:10.1617/s11527-014-0350-3

Cited by 81 publications

(32 citation statements)

References 14 publications

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“…Likewise, in the study by Peng et al [48], some of the one-part-mixing geopolymers produced softened in the water. However, the compressive strength of one-part-mixing geopolymers obtained was higher than those obtained by Kolousek et al [13] (< 1 MPa after 7 days) even for the room-temperature cured one-part-mixing geopolymer.…”

Section: Metakaolin One-part-mixing Geopolymersmentioning

confidence: 84%

“…However, the compressive strength of one-part-mixing geopolymers obtained was higher than those obtained by Kolousek et al [13] (< 1 MPa after 7 days) even for the room-temperature cured one-part-mixing geopolymer. Besides, the one-part-mixing geopolymers produced by Peng et al [48] representing the typical characteristic of geopolymers, that is 20° -40° 2θ [6]. Zeolites (Z) crystalline peaks grew in geopolymer powder and one-part-mixing geopolymers.…”

Section: Metakaolin One-part-mixing Geopolymersmentioning

confidence: 99%

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Formation of one-part-mixing geopolymers and geopolymer ceramics from geopolymer powder

Yun-Ming

Cheng-Yong

et al. 2017

Construction and Building Materials

119

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Geopolymer powder prepared through pre-curing and pulverization showed great potential to produce one-part-mixing geopolymers as well as high flexural strength geopolymer ceramics. The one-part-mixing geopolymers were prepared by mixing geopolymer powder with water while the geopolymer ceramics were prepared by powder metallurgy and sintering. The one-part-mixing geopolymers achieved a compressive strength of 10 MPa after 28 days with formation of geopolymer precipitates in conjunction with zeolite phases. Despite the lower strength, they remained stable and did 2 not disintegrate when immersed in water. Besides, the geopolymer ceramics exhibited high flexural strength (90 MPa) after sintering at 1200°C as result of nepheline formation.

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Section: Metakaolin One-part-mixing Geopolymersmentioning

confidence: 84%

Section: Metakaolin One-part-mixing Geopolymersmentioning

confidence: 99%

Formation of one-part-mixing geopolymers and geopolymer ceramics from geopolymer powder

Yun-Ming

Cheng-Yong

et al. 2017

Construction and Building Materials

119

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“…Almost similar research was carried out by Geraldes et al [104], whereby geopolymers are used as restoration materials for tiles. In Cement Based Materials order to further enhance the usage of geopolymers in civil engineering, researchers have investigated on one-part geopolymer system [105][106][107], whereby geopolymer mixture can be prepared by just adding water. The interest of this study is caused by the limitation of geopolymer technology for in-situ application which lowers its economical value.…”

Section: Applications Of Geopolymersmentioning

confidence: 99%

Clay-Based Materials in Geopolymer Technology

Abdullah¹,

Yun-Ming²,

Cheng-Yong³

et al. 2018

Cement Based Materials

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The term "geopolymer" was introduced by Davidovits in the 1970s. The prefix "geo" was selected to symbolize the constitutive relationship of the binders to geological materials, natural stone and/or minerals. Geopolymer is mineral polymers of inorganic polymer glasses with structure resembling natural zeolitic materials. Previously, geopolymer formation used source materials such as clay (e.g. kaolin and calcined kaolin) or industrial by-product (e.g. slag and fly ash). The precursor material plays an important role in the formation of geopolymer. The source material provides silicon (Si) and aluminum (Al) for reaction by an alkali activator solution. The Si and Al contents in the source materials dissolve in the alkaline activator solution and then polymerize to form a polymeric Si-O-Al-O framework which becomes the binder. Geopolymeric materials are attractive because of their excellent mechanical properties; durability and thermal stability can also be achieved. Owing to their low calcium content, they are more resistant to acid attack than materials based on Portland cement. In addition, they are of great interest because of the reduced energy requirement for their manufacture and the higher sustainability. Recently the search for alternative low cost and easily available materials led among others to Clay. Clay generally consists of a mixture of different clay minerals and associated minerals, which are strongly affected by the nature of the parent rocks. These materials are extensively distributed over the surface of the world and may show certain reactivity after a thermal activation process shows a great potential to be utilized in geopolymer technology. This article presents the potential of different types of clay as the source materials for geopolymerization reaction in terms of morphological properties. Moreover, the mechanical and microstructural properties of geopolymer made with various kinds of clay and its potential application are also presented.The aluminosilicate sources are materials rich in alumina and silica content (e.g. ashes [11][12][13][14], clays [15,16] or slag [17,18]). Some other natural and artificial silicoaluminates such as zeolite [19] and magnesium-contained minerals [20] have also been used as an important source of Si 4+ and Al 4+ ions in the geopolymer binding system. Normally, the total composition of Al 2 O 3 and SiO 2 is more than 70%, preferable in reactive amorphous phase [3,21]. In this book chapter, the utilization of clay or clay minerals in geopolymer formation is discussed. Kaolin/kaoliniteKaolinite is the most common clay mineral used in geopolymer synthesis. It has 1:1 uncharged dioctahedral layer structure (Figure 2a) whereby the layers are (Si 2 O 5 ) n 2− sheet and the Al(OH) 3 (gibbsite) sheet linked by sharing oxygen atoms. The layers are held together by weak van der waals and hydrogen bonds leading to the layered structure (Figure 2b). Figure 2. Structure of kaolinite (above) and microstructure of kaolinite (below) [22]. Clay-Based Materials in Geopolymer ...

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“…However, the preparation of conventional geopolymers is linked with handling of unsafe alkaline solution which restrict its commercial advancement. Considering this drawback, several authors reported one part geopolymer concept, in which water is added to geopolymer binders containing raw materials mixtures . Some studies explored the process kinetics and reaction mechanism of geopolymer prepared using one part concept .…”

Section: Introductionmentioning

confidence: 99%

Multinuclear MAS NMR Characterization of Fly‐Ash‐Based Advanced Sodium Aluminosilicate Geopolymer: Exploring Solid‐State Reactions

et al. 2020

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Advanced geopolymerization includes concept of just addition of water to ready mixture of dry precursor powder. For exploring the coordination environments of binary glass systems, this work presents multinuclear MAS NMR analysis of advanced geopolymer produced by solid state mechanochemical co-grinding of raw materials. The crystalline and amorphous phases of advanced geopolymer were already characterized with XRD in our previous study. This study focus on multinuclear (29Si, 27Al and 23Na) MAS NMR analysis for exploring the coordination environments of Si/Al/Na nuclei in advanced geopolymer. 29Si, 27Al and 23Na MAS NMR spectra of fly ash, advanced geopolymeric precursor material and advanced geopolymer are qualitatively estimated which enables an understanding of insertion of Al in silicate network ensuing solid state reactions during mechanochemical cogrinding process. By combining the NMR interpretations, it can be suitably said that mechanochemical co-grinding is a feasible way to induce local defects in amorphous Si/Al content which lead to variation in bond angles and variations in Si/Al constellations. Results may be very useful to understand framework connectivity, chemistry and behavior of advanced geopolymers produced by solid state route and the developed advanced geopolymer finds its potential application as "ready to use" cementitious material for large scale commercialization.

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Synthesis, characterization and mechanisms of one-part geopolymeric cement by calcining low-quality kaolin with alkali

Cited by 81 publications

References 14 publications

Formation of one-part-mixing geopolymers and geopolymer ceramics from geopolymer powder

Formation of one-part-mixing geopolymers and geopolymer ceramics from geopolymer powder

Clay-Based Materials in Geopolymer Technology

Multinuclear MAS NMR Characterization of Fly‐Ash‐Based Advanced Sodium Aluminosilicate Geopolymer: Exploring Solid‐State Reactions

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