Effect of limestone dosages on some properties of geopolymer from thermally activated halloysite

Bayiha, Blaise Ngwem; Billong, Ndigui; Yamb, Emmanuel; Kaze, Cyriaque Rodrigue; Nzengwa, Robert

doi:10.1016/j.conbuildmat.2019.05.058

Cited by 88 publications

(30 citation statements)

References 23 publications

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“…Halloysite (Al 2 Si 2 O 5 (OH) 4 •2H 2 O) is a natural and abundant clayey material. It has the same theoretical chemical composition as kaolinite except that it contains additional water molecules between the layers and most commonly has a tubular morphology [20,21]. On the contrary, kaolinite (Al 2 Si 2 O5(OH) 4 ) is a simple layer aluminosilicate consisting of alternate layers of silica and alumina in tetrahedral and octahedral coordination, respectively [22] and typically occurs in platy form.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural properties of geopolymer mortars from meta-halloysite: effect of titanium dioxide TiO2 (anatase and rutile) content

et al. 2020

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This study aimed to investigate the effect of Titanium Dioxide TiO 2 (anatase and rutile) on mechanical and microstructural properties of meta-halloysite based geopolymer mortars namely GMHA and GMHR series. Meta-halloysite received 2.5, 5.0, 7.5 and 10 wt% of anatase or rutile as addition before calcination and geopolymerization. The raw materials and the end products were characterized using XRD, FTIR, ESEM and MIP analyses. The flexural strength increases from 6.90 to 9.13 MPa and from 6.90 to 12.33 MPa for GMHA and GMHR series respectively. The cumulative pore volume decreases from 102.2 to 84.2 mm 3 g −1 and from 102.2 to 51.3 mm 3 g −1 for GMHA and GMHR products respectively. Both matrices present micrographs with very low capillaries pores and fractured surfaces that confirmed the enhancement of the mechanical properties. It was concluded that TiO 2 in both forms is beneficial for the reduction of porosity and densification of geopolymer matrices. Rutile enabled more compact and denser geopolymer structure compared to anatase. The aforementioned results showed the efficiency of both fine TiO 2 particles to improve the geopolymer network significant for its durability.

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Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural properties of geopolymer mortars from meta-halloysite: effect of titanium dioxide TiO2 (anatase and rutile) content

et al. 2020

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“…As stated in the introduction, most of the works considered the use of carbonate powders only as filler added to the raw powders traditionally used in the alkali activation process [50,[55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72]; only two works investigated the use of carbonates alone [40,45]. In particular, carbonate fines have been used in combination with MK [50,55,57,67], FA [58,59,62,65,66,68], GBFS [56,59,61,65,[68][69][70]72], and clays (bentonite [60], smectite [64], halloysite [71], undefined [65]).…”

Section: Role Of Raw Materials Activators and Curing Conditionsmentioning

confidence: 99%

“…The main difference among all the studied carbonate stone powders is the calcite and/or dolomite content, resulting in a different chemical composition that can be mainly expressed in terms of CaO and MgO content (Table 3). Indeed, articles can be summarized in three different groups according to the chemical nature of the starting minerals: mainly composed of calcite [45,[55][56][57][58]60,[63][64][65][66][67][68][69][70][71][72], with prevailing dolomite content [50,55,[59][60][61][62] and a mixture of calcite and dolomite [72].…”

Section: Role Of Raw Materials Activators and Curing Conditionsmentioning

confidence: 99%

“…Gao et al [68] investigated ternary mixtures containing GBFS/FA/limestone with three different limestone contents: 10, 20, and 30 wt.%, respectively. Bayiha et al [71] studied the alkali activation of thermally activated halloysite (a two-layered clay) with several limestone replacements (from 0% to 60%). Finally, Orteza-Zavala et al [40] and Coppola et al [45] used only calcite (limestone and marble, respectively) as raw powders in the alkali activation process.…”

Section: Role Of Raw Materials Activators and Curing Conditionsmentioning

confidence: 99%

“…It can be easily observed that alkaline solutions containing sodium hydroxide (NaOH) and sodium silicate (Na 2 SiO 3 ) are the most used [40,45,50,55,57,58,62,[64][65][66]68,71]. Incidentally, it is worth noticing that, due to its reactivity properties as an alkaline activator, the use of sodium silicate is also well established in the cement and concrete industry, where it may act as a sealant, a densifying additive, or even a healing agent for self-healing applications [86][87][88][89].…”

Section: Role Of Raw Materials Activators and Curing Conditionsmentioning

confidence: 99%

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Role of Natural Stone Wastes and Minerals in the Alkali Activation Process: A Review

et al. 2020

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This review aims to provide a comprehensive assessment concerning alkali activation of natural stone wastes and minerals. In particular, the structure of the review is divided into two main sections in which the works dealing with alumino-silicate and carbonatic stones are discussed, respectively. Alumino-silicate stones are generally composed of quartz and feldspars, while carbonatic stones are mainly made of calcite and dolomite. The role of these minerals in the alkali activation process is discussed, attesting their influence in the development of the final product properties. In most of the works, authors use mineral additions only as fillers or aggregates and, in some cases, as a partial substitution of more traditional raw powders, such as metakaolin, fly ash, and granulated blast furnace slag. However, a few works in which alumino-silicate and carbonatic stone wastes are used as the main active components are discussed as well. Not only the raw materials, but also the entire alkali activation process and the curing conditions adopted in the literature studies here reviewed are systematically analyzed to improve the understanding of their effect on the physical, mechanical, and durability properties of the final products and to eventually foster the reuse of natural stone wastes for the purposes of sustainability in different applications.

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Geopolymer Cement for Sustainable Construction: A Review

Carvalho

Gaspar

Mateus

et al. 2023

Sustainable and Digital Building

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Effect of limestone dosages on some properties of geopolymer from thermally activated halloysite

Cited by 88 publications

References 23 publications

Mechanical and microstructural properties of geopolymer mortars from meta-halloysite: effect of titanium dioxide TiO2 (anatase and rutile) content

Mechanical and microstructural properties of geopolymer mortars from meta-halloysite: effect of titanium dioxide TiO2 (anatase and rutile) content

Role of Natural Stone Wastes and Minerals in the Alkali Activation Process: A Review

Geopolymer Cement for Sustainable Construction: A Review

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