High-temperature behavior of geopolymer mortar containing nano-silica

Zhang, Peng; Han, Xu; Guo, Jinjun; Hu, Shaowei

doi:10.1016/j.conbuildmat.2022.129983

Cited by 28 publications

(4 citation statements)

References 63 publications

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“…Also, the addition of CWP caused a lower residual CS, but a minute reduction in CS was for y-only GM. But, some research has also reported a reduction in CS when heated to more than 200°C (Zhang et al 2023).…”

Section: Temperature Effects On Compressive Strengthmentioning

confidence: 99%

High temperature and abrasion resistance of fly ash and ceramic waste powder based geopolymer mortar

Bhavsar,

Panchal

2024

Preprint

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The increasing popularity of geopolymer concrete is attributed to its small ecological footprint. Moreover, it presents substantial prospects for employing industrial waste as a substitute binder for producing geopolymer concrete. The ceramic waste powder (CWP), which is a by-product of the ceramic polishing and glazing process, was employed in the manufacturing of geopolymer mortar. This study investigated the heat and abrasion resistance of geopolymer mortar (GM) produced using two different types of CWP and fly ash. A GM was prepared by combining fly ash, CWP, and the alkaline activators NaOH and Na2SiO3. The study examined three different curing conditions: ambient, curing at 60 °C for 24 hours, and curing at 60 °C for 48 hours. All mortar mixes were heated to temperatures of 500°C and 1000°C for a period of 2 hours (h) to study their heat resistance. Both weight loss and compressive strength (CS) were assessed before and after temperature exposure. The assessment of abrasion resistance was conducted in line with the Indian standard. The study suggests that the utilization of CWP enhances the high temperature and abrasion resistance of GM.

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Section: Temperature Effects On Compressive Strengthmentioning

confidence: 99%

High temperature and abrasion resistance of fly ash and ceramic waste powder based geopolymer mortar

Bhavsar,

Panchal

2024

Preprint

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“…The good mechanical response of continuous-fiber GP composites under temperatures ranging above 200 °C has been demonstrated in several earlier investigations, − targeting solely high-tech automotive or aerospace applications. The replacement of cement with more environmentally friendly GP in construction can deliver comparable mechanical strength, excellent heat/fire resistance, high durability, low shrinkage, reduced carbon footprint, zero degradation under UV light, and high corrosion resistance to all organic solvents and acids. , GPs are commonly synthesized by an activated polycondensation reaction in a highly alkaline or an acid medium from a variety of naturally occurring minerals, e.g., metakaolin (MK), or industrial byproducts, e.g., fly ash and rice husk ash. − In earlier studies, , a GP-impregnation matrix implied some chemical incompatibility with fresh cement concrete substrates and required further treatment by washing with water to reduce the presence of excess alkali and ensure adequate bond properties. Hence, GP concrete is expected to provide high compatibility with fiber-reinforced GP composites.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Pullout Behavior of Geopolymer Concrete Reinforced with Polymer- or Mineral-Impregnated Carbon Fiber Composites: An Experimental and Numerical Study

Zhao

Liebscher

et al. 2023

ACS Sustainable Chem. Eng.

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Despite significant advantages, large-scale use of carbon-reinforced concrete has been hitherto limited due to insufficient thermal resistance and chemical compatibility with cementitious materials. In this regard, mineral-impregnated carbon fibers (MCFs) made with a geopolymer (GP) are a promising, novel reinforcement for GP concrete, making cement-free, lightweight, fireproof, and durable structures. This paper is envisaged to study the temperature-dependent pullout behavior of MCFs in GP concrete and for a comparison with a commercial, epoxy-impregnated product. The experimental results showed comparable load-transferring capacity and post-crack behavior at ambient temperature but better bonding quality at elevated temperatures for MCFs. These were explained by the material structures, failure patterns, and thermal behavior of the yarns and GP concrete, as characterized by micro-tomography, microscopy, thermogravimetric analysis, and mercury intrusion porosimetry. Finally, a three-dimensional, finite element model was used to simulate and predict the pull-out process through a combined discrete cohesive zone model and smeared phase-field method in a representative crack element framework. With proper parametric calibrations, evident agreement between numerical and experimental results was gained.

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“…Additionally, these geopolymers are recognized for their impressive initial strength [7,8] and fast setting [9,10]. Furthermore, they demonstrate resilience against high temperatures [11,12], acidic conditions [13], carbonation [14], chloride exposure [15,16], and sulfate attacks [17].…”

Section: Introductionmentioning

confidence: 99%

Impact of Eggshell Powder on the Mechanical and Thermal Properties of Lightweight Geopolymer

Rathinavel,

Kannadasan,

Mohamed Ismail

et al. 2023

Advances in Civil Engineering

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Adopting proper waste management technology in the place of the construction industry to the extent possible to lower the production of new materials and intern reduces the environmental impact pertaining to the industry. In this work, eggshell powder (ESP; waste from the poultry industry) and fly ash (FA; waste from combustion of coal) were utilized as precursors for producing geopolymer and to substitute conventional cement-based construction materials. Three different weight percentage ratios of precursors, namely, 90FA:10ESP, 80FA:20ESP, and 70FA:30ESP were reinforced with two different weight percentages, namely, 15 and 30 wt% of paddy straw in the presence of suitable combinations of sodium silicate and sodium hydroxide to obtain lightweight geopolymer panels. Results received from different analytical tests, namely, density, water absorption, compressive strength, and flexural strength infer that the incorporation of ESP enhances the performance of the geopolymer products to a considerable extent. The specimen sample made using 70FA:30ESP in the absence of paddy straw reinforcement possesses a compressive strength value of 15.64 MPa, which is higher than that of paddy straw reinforced panels. It was observed that there was a reverse trend noticed in the case of flexural behavior on reinforcement of paddy straw, namely, 15 wt% possesses a higher value than that of the panel (70FA:30ESP) made using in the absence of reinforcement. The lowest thermal conductivity value was observed at 0.0633 W/m·K for the sample 90FA:10ESP reinforced with 30% paddy straw. Data from different studies infer that using ESP and paddy straw reinforcement influences strength properties and thermal conductivity. The present study indicates valid information related to the using biowastes for the production of insulation materials and environmental preservation and energy conservation.

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High-temperature behavior of geopolymer mortar containing nano-silica

Cited by 28 publications

References 63 publications

High temperature and abrasion resistance of fly ash and ceramic waste powder based geopolymer mortar

High temperature and abrasion resistance of fly ash and ceramic waste powder based geopolymer mortar

Temperature-Dependent Pullout Behavior of Geopolymer Concrete Reinforced with Polymer- or Mineral-Impregnated Carbon Fiber Composites: An Experimental and Numerical Study

Impact of Eggshell Powder on the Mechanical and Thermal Properties of Lightweight Geopolymer

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