Effects of Ultrafine Fly Ash on Setting, Strength, and Porosity of Geopolymers Cured at Room Temperature

Deb, Partha Sarathi; Sarker, Prabir Kumar

doi:10.1061/(asce)mt.1943-5533.0001745

Cited by 23 publications

(15 citation statements)

References 17 publications

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“…Fly ash geopolymer has been used as a substitute for Portland cement owing to its availability, low water demand, and low CO2 emissions, [2,3], essentially as a recycled geopolymer binder [4,5]. Materials with high aluminosilicate compositions, such as fly ash, slag, and meta-kaoline, produce geopolymers with alkali content [6,7], where NaOH, KOH, and Na2SiO3 are commonly used in most studies [8]. Polycondensation helps aluminosilicate materials form geopolymer gels.…”

Section: Introductionmentioning

confidence: 99%

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Ceramic Waste Powder as a Partial Substitute of Fly Ash for Geopolymer Concrete Cured at Ambient Temperature

Bhavsar

Panchal

2022

Civ Eng J

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The growth of the construction industry has expanded the demand for ceramic building products such as ceramic tiles, which constitute essential building materials. Nonetheless, a huge quantity of waste powder is produced during the polishing of ceramic tiles. The disposal of ceramic waste powder is a key environmental concern that needs to be properly addressed. The purpose of this research is to evaluate the potential of recycling ceramic waste powder as a geopolymer binder. The main objective consists of exploring the impacts of two types of ceramic waste powder (vitrified tiles and wall tiles) on the partial substitution of fly ash in geopolymer concrete. For this, concrete was prepared under ambient conditions without oven curing. Slump, compressive strength, split tensile strength, and modulus of elasticity tests were performed to measure the workability and the mechanical properties of the geopolymer concrete. Its durability was evaluated through water absorption and sorptivity tests. The microstructural behavior was investigated using scanning electron microscopy and X-ray diffraction measurements. The investigation revealed that a 15% partial replacement of fly ash by wall-tile ceramic waste powder in geopolymer concrete gave similar compressive strength, a 3% increase in tensile strength, and a 7% improvement in the modulus of elasticity. Partial replacement of fly ash with 15% vitrified ceramic waste powder reduced sorptivity and improved the microstructure of geopolymer concrete. The findings revealed that ceramic waste powder can be used to replace 10–15% of the fly ash in M35 grade structural geopolymer concrete, which can be cured under ambient conditions. Doi: 10.28991/CEJ-2022-08-07-05 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

“…A higher quantity of slag yields calcium-based reaction products and a lower amount of geopolymer gel. Previous studies have reported class F fly ash with other binders for GPC under ambient conditions [6,12,[25][26][27][28][29][30]. The method of heat curing limits the application of GPC in cast-in situ operation.…”

Section: Introductionmentioning

confidence: 99%

Ceramic Waste Powder as a Partial Substitute of Fly Ash for Geopolymer Concrete Cured at Ambient Temperature

Bhavsar

Panchal

2022

Civ Eng J

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“…The neness of the yash plays a vital role in the development of strength, increases the strength, and decreases the mix's setting time [19] [20]. The neness of yash directly reduces the porosity by increasing small particles in the mix [21] [22]. In the geopolymerisation reaction, curing time directly affects the mix's early strength development, and longer curing time gives better end products after the reaction [23].…”

Section: Introductionmentioning

confidence: 99%

Geopolymer Concrete: A Sustainable and Economic Concrete via Experimental Analysis

Verma¹,

Dev²

2021

Preprint

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Geopolymer concrete is a sustainable, economical, eco-friendly, and high-strength concrete. The GPC utilizes industrial solid wastes like flyash and slag as binding material and is activated by the alkaline solution containing NaOH and Na2SiO3 in the design mix. The experimental investigation analyzes both GPC and OPC concrete's physical and mechanical properties for the same mix design and analyzes the concretes cost and sustainability. After the experimental investigation, the GPC and OPC concrete's compressive strength shows similar trends at the 28 days strength, but the initial three days strength of the GPC strength is much higher than the OPC concrete, but around 28 days, the compressive strength of concrete mix got similar. The splitting tensile strength and flexural strength of the GPC specimens are slightly higher than the OPC concrete mix specimens. The OPC concrete's elastic modulus is slightly higher than the GPC mix design, whereas the Poisson ratio of the OPC concrete is slightly lower than the GPC mix designs. The GPC has less embodied energy compared to the OPC concrete. The cost of the GPC at a bulk level reduced the cost of up to 40% of the OPC concrete.

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“…Geopolymers are inorganic polymers where an aluminosilicate source material is commonly reacted with an alkali to produce the binder. Geopolymer mixtures can be tailored to achieve properties comparable to those of ordinary Portland cement (OPC) binders [ 3 ]. In a recent study, Bewa et al [ 4 ] showed that geopolymers based on fired clay brick powder and an acid solution could develop high strength after room temperature curing.…”

Section: Introductionmentioning

confidence: 99%

Workability and Flexural Properties of Fibre-Reinforced Geopolymer Using Different Mono and Hybrid Fibres

et al. 2021

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The effects of mono (single type) and hybrid (mixed types) fibres on the workability, compressive strength, flexural strength, and toughness parameters of fly ash geopolymer mortar were studied. The ratio of sand to geopolymer paste of the mortar was 2.75. It was found that workability of mortar decreased more with the use of PP fibres due to its higher dispersion into individual filaments in geopolymer mortar compared to the bundled ARG and PVA fibres. Compressive strength increased by 14% for using 1% steel with 0.5% PP fibres compared to that of the control mixture, which was 48 MPa. However, 25 to 30% decrease of compressive strength was observed in the mortars using the low-modulus fibres. Generally, flexural strength followed the trend of compressive strength. Deflection hardening behaviours in terms of the ASTM C1609 toughness indices, namely I5, I10 and I20 were exhibited by the mortars using 1% steel mono fibres, 0.5% ARG with 0.5% steel and 1% PVA with 0.5% steel hybrid fibres. The toughness indices and residual strength factors of the mortars using the other mono or hybrid fibres at 1 or 1.5% dosage were relatively low. Therefore, multiple cracking and deflection hardening behaviours could be achieved in fly ash geopolymer mortars of high sand to binder ratio by using steel fibres in mono or hybrid forms with ARG and PVA fibres.

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Effects of Ultrafine Fly Ash on Setting, Strength, and Porosity of Geopolymers Cured at Room Temperature

Cited by 23 publications

References 17 publications

Ceramic Waste Powder as a Partial Substitute of Fly Ash for Geopolymer Concrete Cured at Ambient Temperature

Ceramic Waste Powder as a Partial Substitute of Fly Ash for Geopolymer Concrete Cured at Ambient Temperature

Geopolymer Concrete: A Sustainable and Economic Concrete via Experimental Analysis

Workability and Flexural Properties of Fibre-Reinforced Geopolymer Using Different Mono and Hybrid Fibres

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