Study of Interaction between Fly Ash-cement and Bentonite Matrices

Daněk, Tomáš; Thomas, Jan; Jelı́nek, Jan

doi:10.1051/matecconf/20152601003

Cited by 4 publications

(3 citation statements)

References 6 publications

(5 reference statements)

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“…PPF can also improve the abrasion resistance of GPC mixtures by bridging cracks and preventing their propagation. Similar findings were reported by Grdic et al [73] where abrasion resistance of polypropylene fiber-reinforced concrete was evaluated. It was reported that the addition of PPF has a positive effect and aids in increasing the resistance of concrete to abrasive erosion.…”

Section: Abrasion Resistancesupporting

confidence: 88%

“…Additionally, the pozzolanic reactivity of bentonite may lead to the development of calciumsilicate-hydrate (C-S-H) gel in conjunction with geopolymer gel, which can provide an even denser microstructure of the GPC [72]. It was reported by different studies [33,72,73] that the addition of bentonite to cementitious matrices results in the development of C-S-H phases. It is also reported that CASH phases are developed when bentonite is added to fly ash-based cementitious products.…”

Section: Water Absorptionmentioning

confidence: 99%

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Influence of Bentonite and Polypropylene Fibers on Geopolymer Concrete

Waqas,

Zaman,

Alkharisi

et al. 2024

Sustainability

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Bentonite is one of the SiO2-rich pozzolanic clay types that has been enormously employed as a cost-effective and eco-friendly supplementary cementitious material in ordinary Portland cement (OPC) concrete. However, the use of bentonite in geopolymer concrete (GPC) has not been explored very widely. Further, the research available on the effect of utilizing treated bentonite in GPC is limited. The practical application of GPC is also very limited due to its significant shrinkage and high brittleness compared to OPC concrete. There are several studies available that have highlighted the use of polypropylene fibers (PPF) in improving the mechanical properties of GPC by reducing drying shrinkage and enhancing ductility. However, the effect of PPF on the durability properties of GPC needs to be addressed. Further, the effect of the combined integration of bentonite and PPF on the mechanical and durability properties of GPC has not been reported yet. The aim of this study is, therefore, to investigate the individual and combined effect of bentonite and PPF on the workability, mechanical properties, and durability of fly ash (FA)-based GPC. Bentonite replaced 10% of FA, and PPF was added at varying proportions (0.5%, 0.75%, and 1%) for raw and treated bentonite. Slump test was used to assess workability, while compressive, tensile, and flexural tests were utilized to evaluate the mechanical properties. Water absorption, acid attack, and abrasion resistance tests were used to evaluate durability. The results showed that bentonite and PPF significantly enhance mechanical properties, especially when combined with treated bentonite, with the highest improvement observed for mixtures with 1% PPF. The compressive strength was improved by an extent of 10% and 18% for raw bentonite-GPC and treated bentonite-GPC, respectively, compared to the control mix without bentonite. The durability test results revealed that water absorption of raw and treated bentonite-GPC mixtures at the age of 90 days was decreased by 16% and 21%, respectively, compared to the control mix (without bentonite). The mass loss of raw and treated bentonite-GPC mixtures in sulphuric acid solution was 5% and 10% lower, respectively, than the control mix (without bentonite). The mass loss of raw and treated bentonite-GPC mixtures in abrasion resistance tests was 6% and 12% lower, respectively, than the control mix (without bentonite). For durability performance, mixtures with 0.5% PPF perform the best, while higher PPF contents negatively impact the GPC durability.

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Section: Abrasion Resistancesupporting

confidence: 88%

Section: Water Absorptionmentioning

confidence: 99%

Influence of Bentonite and Polypropylene Fibers on Geopolymer Concrete

Waqas,

Zaman,

Alkharisi

et al. 2024

Sustainability

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“…Due to the finer particle size of bentonite than the fly ash, it can have a uniform distribution in the mix matrix of both the GNAC and GRAC, thus providing a more compact and denser microstructure. In addition, the pozzolanic reactivity of bentonite may have resulted in the development of C-S-H gel in combination with geopolymeric gel that can provide a further denser microstructure of geopolymer matrix [65,66]. Therefore, it can be inferred that the incorporation of bentonite in both the GNAC and GRAC mixes is beneficial in terms of reducing the water absorption capabilities of the geopolymer matrix.…”

Section: Water Absorptionmentioning

confidence: 99%

Influence of Bentonite on Mechanical and Durability Properties of High-Calcium Fly Ash Geopolymer Concrete with Natural and Recycled Aggregates

et al. 2021

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In this study, bentonite (a naturally occurring pozzolana) was incorporated as a partial replacement (up to 20%) for high-calcium fly ash (HCFA)-based geopolymeric natural aggregate concrete (GNAC) and geopolymeric recycled aggregate concrete (GRAC). The mechanical (compressive strength and splitting tensile strength), durability (chloride migration coefficient, water absorption, and acid attack resistance), and rheological properties (slump test, fresh density, and workability) were investigated. The results revealed that incorporation of bentonite (10 wt % with ordinary Portland cement) showed appreciable improvement in the strength and durability of both the GNAC and GRAC, though its effect is more significant for GRAC than the GNAC.

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Influence of nano bentonite clay and nano fly ash on the mechanical and durability properties of concrete

Das,

Tiwary

2023

Clean Techn Environ Policy

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Study of Interaction between Fly Ash-cement and Bentonite Matrices

Cited by 4 publications

References 6 publications

Influence of Bentonite and Polypropylene Fibers on Geopolymer Concrete

Influence of Bentonite and Polypropylene Fibers on Geopolymer Concrete

Influence of Bentonite on Mechanical and Durability Properties of High-Calcium Fly Ash Geopolymer Concrete with Natural and Recycled Aggregates

Influence of nano bentonite clay and nano fly ash on the mechanical and durability properties of concrete

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