WITHDRAWN: A review – Behaviour of geopolymer concrete to high temperature

Beddu, Salmia; Ahmed, Ali Najah; Al-Hubboubi, Suhair

doi:10.1016/j.matpr.2021.05.489

Cited by 5 publications

(3 citation statements)

References 88 publications

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“…(2) After drying, the specimens were placed in a high temperature furnace for calcination under different calcination regimes. (3) Step (1) was repeated for the calcined specimen, and the sample volume V 2 was obtained after the high temperature treatment.…”

Section: Volume Stability Testmentioning

confidence: 99%

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Effect of MgO and Al2O3 on high temperature stability performance of high-alumina cement

Wang

Guo

2023

Preprint

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High-alumina cement has an important position in refractory materials with its good performance at high temperatures, but its own disadvantages such as strength inversion and unstable transformation of hydration products have always limited its development. To clarify the working mechanism of high-alumina cement and improve its high temperature resistance, MgO and Al2O3 were added to the high-alumina cement paste. The optimal design method was used to determine the influence of each factor on the high temperature stability of the cement paste. The raw material ratios were optimized and the strength change patterns of the specimens under the optimal ratio were verified. From a microstructure perspective, the high temperature evolution of the hardened paste of high-alumina cement was explored using X-ray diffraction, scanning electron microscopy, thermogravimetry, and differential scanning calorimetry. The results show that the introduction of refractory powders, especially Al2O3, can significantly improve the volumetric stability of the cement paste at high temperatures. When the water-cement ratio is 0.20, the admixture of MgO is 5% or 10%, and Al2O3 is 20%, the high temperature volume stability of the cement paste is the best. However, its corresponding mechanical strength is weakened to some extent with an increase in calcinating temperature. Moreover, the structure-property evolution process of cementite under high temperature calcinating conditions was verified by microstructural characterization, especially the improvement effect of the refractory powder on the high temperature resistance of the cement paste. The results of this study can serve as a guide for the development of high-alumina cement and its cementing materials, as well as for the improvement of their properties.

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Section: Volume Stability Testmentioning

confidence: 99%

“…The high temperature performance of concrete is essential for assessing the re performance of various concrete structural systems [3]. The main factors affecting the performance of high alumina cement concrete are the amount of high-alumina cement content, powder mix, and temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of MgO and Al2O3 on high temperature stability performance of high-alumina cement

Wang

Guo

2023

Preprint

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“…Investigations proved that GPC loses its strength after being exposed to a temperature of about 400 • C depending on the raw material. The drop in compressive strength (in percentage) of fly-ash-based GPC is 35%, 44%, 50%, and 75% when exposed to elevated temperatures, i.e., 400 • C, 600 • C, 800 • C and 1000 • C, respectively [48]. Similar to fire resistance, GPC specimens also have frost resistance [49].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microstructural Characterization of Quarry Rock Dust Incorporated Steel Fiber Reinforced Geopolymer Concrete and Residual Properties after Exposure to Elevated Temperatures

et al. 2021

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The purpose of this research is to study the effects of quarry rock dust (QRD) and steel fibers (SF) inclusion on the fresh, mechanical, and microstructural properties of fly ash (FA) and ground granulated blast furnace slag (SG)-based geopolymer concrete (GPC) exposed to elevated temperatures. Such types of ternary mixes were prepared by blending waste materials from different industries, including QRD, SG, and FA, with alkaline activator solutions. The multiphysical models show that the inclusion of steel fibers and binders can enhance the mechanical properties of GPC. In this study, a total of 18 different mix proportions were designed with different proportions of QRD (0%, 5%, 10%, 15%, and 20%) and steel fibers (0.75% and 1.5%). The slag was replaced by different proportions of QRD in fly ash, and SG-based GPC mixes to study the effect of QRD incorporation. The mechanical properties of specimens, i.e., compressive strength, splitting tensile strength, and flexural strength, were determined by testing cubes, cylinders, and prisms, respectively, at different ages (7, 28, and 56 days). The specimens were also heated up to 800 °C to evaluate the resistance of specimens to elevated temperature in terms of residual compressive strength and weight loss. The test results showed that the mechanical strength of GPC mixes (without steel fibers) increased by 6–11%, with an increase in QRD content up to 15% at the age of 28 days. In contrast, more than 15% of QRD contents resulted in decreasing the mechanical strength properties. Incorporating steel fibers in a fraction of 0.75% by volume increased the compressive, tensile, and flexural strength of GPC mixes by 15%, 23%, and 34%, respectively. However, further addition of steel fibers at 1.5% by volume lowered the mechanical strength properties. The optimal mixture of QRD incorporated FA-SG-based GPC (QFS-GPC) was observed with 15% QRD and 0.75% steel fibers contents considering the performance in workability and mechanical properties. The results also showed that under elevated temperatures up to 800 °C, the weight loss of QFS-GPC specimens persistently increased with a consistent decrease in the residual compressive strength for increasing QRD content and temperature. Furthermore, the microstructure characterization of QRD blended GPC mixes were also carried out by performing scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS).

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State-of-the-Art Review on Synthesis and Utilization on Graphene Oxide in Concrete Under Elevated Temperature

Ramana,

Parthasarathi

2023

Lecture Notes in Civil Engineering

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WITHDRAWN: A review – Behaviour of geopolymer concrete to high temperature

Cited by 5 publications

References 88 publications

Effect of MgO and Al2O3 on high temperature stability performance of high-alumina cement

Effect of MgO and Al2O3 on high temperature stability performance of high-alumina cement

Mechanical and Microstructural Characterization of Quarry Rock Dust Incorporated Steel Fiber Reinforced Geopolymer Concrete and Residual Properties after Exposure to Elevated Temperatures

State-of-the-Art Review on Synthesis and Utilization on Graphene Oxide in Concrete Under Elevated Temperature

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