Rheological, fresh, and mechanical properties of mechanochemically activated geopolymer grout: A comparative study with conventionally activated geopolymer grout

Abed, Mukhtar Hamid; Abbas, Israa Sabbar; Hamed, Majid; Çanakçı, Hanifi

doi:10.1016/j.conbuildmat.2022.126338

Cited by 19 publications

(4 citation statements)

References 109 publications

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“…The formation of a large proportion of gel in the geopolymer mixture improved the overall pore volume and porosity of the geopolymer grout, resulting in enhanced immobilisation (Mukhtar et al, 2022a). Similar MG grout behaviour was reported in (Mukhtar et al, 2022b;Fern andez-Jim enez et al, 2019;Adesanya et al, 2020). On the other hand, the results revealed that the USC of OPC sample was a little higher than that of the MG-GP0 and CG mixes due to the high shrinkage of slag and lower calcium content compared to OPC.…”

Section: Ucssupporting

confidence: 70%

Effect of glass powder on the rheological and mechanical properties of slag-based mechanochemical activation geopolymer grout

Abed

Abbas

Çanakçı

2022

European Journal of Environmental and Civil Engineering

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This article discusses the effects of glass powder (GP) replacements and sodium hydroxide (NaOH) molarity on the rheological, fresh, mechanical and microstructure characteristics of slag-based mechanochemical geopolymer (MG) grout. A conventionally activated geopolymer grout and an ordinary Portland cement (OPC) grout were also investigated for comparison. Four glass powder replacement ratios were used (0%, 10%, 20% and 30% by the total precursor weight) to prepare slag-based mechanochemical geopolymer at three NaOH concentrations (1.25, 2.5 and 3.75 molars). The experimental results showed that the rheological behaviour of MG grouts was considerably reduced, whereas the setting time and the bleeding capacity value increased when slag was substituted with 0%-30% GP. However, after 28 days, the unconfined compressive strength (UCS) improved by 2%-13% when 10%-20% GP was used as a slag replacement, then dropped by 4% when 30% GP was substituted. The results confirmed that both geopolymer grouts irrespective of the activation method had shorter setting time and more stable bleeding capacity than OPC grout. The results also revealed that the UCS of geopolymer grout is enhanced by 18% when the source materials are activated by the mechanochemical method compared to the conventional activation of geopolymer grout. The microstructure results revealed that the activation method had a considerable effect on the microstructure of geopolymer grout because the ball milling process increased the surface area and reduced the particle size of slag compared to conventionally activated geopolymer grout.

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Section: Ucssupporting

confidence: 70%

Effect of glass powder on the rheological and mechanical properties of slag-based mechanochemical activation geopolymer grout

Abed

Abbas

Çanakçı

2022

European Journal of Environmental and Civil Engineering

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“…The pozzolanic effect of FA can reduce the dissolved or leached Ca(OH) 2 in corrosive environments and improve the fluidity and properties of fresh mixture grouts containing Portland cement (PC) and FA (Mirza et al, 2002; Wang & Lee, 2010). The slag can reasonably improve the flowability of the grout mixture (Abed et al, 2022; Gopinathan & Anand, 2018). Furthermore, SUP is used to increase the fluidity and spreadability of grouts.…”

Section: Introductionmentioning

confidence: 99%

Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

Tian,

Chen,

Han

et al. 2023

Deep Underground Science and Engineering

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The fractured surrounding rocks of roadways pose major challenges to safe mining. Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks. The aim of this study is to develop highly efficient composite ultrafine cement (CUC) grouts to reinforce the roadway in fractured surrounding rocks. The materials used are ultrafine cement (UC), ultrafine fly ash (UF), ultrafine slag (US), and additives (superplasticizer [SUP], aluminate ultrafine expansion agent [AUA], gypsum, and retarder). The fluidity, bleeding, shrinkage, setting time, chemical composition, microstructure, degree of hydration, and mechanical property of grouting materials were evaluated in this study. Also, a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding rock. The results have shown that the addition of UF and US reduces the plastic viscosity of CUC, and the best fluidity can be obtained by adding 40% UF and 10% US. Since UC and UF particles are small, the pozzolanic effect of UF promotes the hydration reaction, which is conductive to the stability of CUC grouts. In addition, fine particles of UC, UF, and US can effectively fill the pores, while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified grout. The compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC grouts. Finally, the CUC22‐8 grout was used to reinforce the No. 20322 belt roadway. The results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the roadway. In this research, high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives.

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“…The results suggested that grouts with high flowability and strength combined with low RAP content demonstrated the best results. A mixture of slag, fly ash, sodium silicate and sodium hydroxide was milled for 2 h and mixed with water to produce mechanochemical-activated geopolymer grout [19]. Different fly-ash-to-slag ratios and molarities of sodium hydroxide solutions were produced and the data were compared with conventional geopolymer cement grouts.…”

Section: Introductionmentioning

confidence: 99%

Thermally Treated Waste Silt as Geopolymer Grouting Material and Filler for Semiflexible Pavements

2022

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Considering the future shortage of natural aggregates, various researchers have promoted the recycling of by-products into various asphalt pavement types. This paper promoted a double-recycling technique, where thermally treated waste silt was used as a filler for the bituminous skeleton and grouting material of a geopolymer-based semiflexible pavement. Semiflexible pavements (SFP) inherit the flexibility of common asphalt pavements and simultaneously benefit from the rigidity of cement concrete pavements. For this purpose, waste silt obtained from a local asphalt plant was thermally treated at 750 °C and was used as the filler to produce the porous skeleton. Two different materials, including conventional cement-based and a geopolymer-based cement, were used as the grouting material. The geopolymer grout was produced by mixing metakaolin (MK), potassium-based liquid hardener and calcined silt as filler. The porous and grouted samples were characterized in terms of indirect tensile strength (ITS), the indirect tensile strength modulus (ITSM) and moisture sensitivity. The use of thermally treated waste silt as filler in porous asphalt demonstrated promising results and was comparable to the control samples produced with limestone as the filler. However, the control samples grouted with cement-based material outperformed the geopolymer grout in all aspects. Moreover, the addition of calcined silt improved the low-temperature fatigue performance of porous and grouted asphalt pavements.

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Rheological, fresh, and mechanical properties of mechanochemically activated geopolymer grout: A comparative study with conventionally activated geopolymer grout

Cited by 19 publications

References 109 publications

Effect of glass powder on the rheological and mechanical properties of slag-based mechanochemical activation geopolymer grout

Effect of glass powder on the rheological and mechanical properties of slag-based mechanochemical activation geopolymer grout

Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

Thermally Treated Waste Silt as Geopolymer Grouting Material and Filler for Semiflexible Pavements

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