Experimental Evaluation of New Geopolymer Composite with Inclusion of Slag and Construction Waste Firebrick at Elevated Temperatures

Sevim, Özer; Demir, İlhami; ALAKARA, Erdinç Halis; Bayer, İsmail Raci

doi:10.3390/polym15092127

Cited by 16 publications

(4 citation statements)

References 60 publications

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“…Current research encompasses the utilization of various industrial by-products and natural resources [ 10 , 11 , 12 ]. Hwangto, a material with a widespread geographical distribution covering approximately 10% of the Earth’s surface, offers the benefits of a stable supply chain [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Strength Prediction of Non-Sintered Hwangto-Substituted Concrete Using the Ultrasonic Velocity Method

Im,

Kim,

Choi

et al. 2023

Materials

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This paper presents and investigates the properties of concrete in which a portion of the cement is substituted with non-sintered Hwangto (NSH), a readily available building material in Asia. Given the inactive nature of NSH, this study aimed to determine the optimal cement replacement ratio and quantitative strength of the material. The unit weight, compressive strength, ultrasonic pulse velocity (UPV), and stress–strain of the NSH concrete (NSHC) were evaluated. Additionally, we developed a predictive model for determining compressive strength based on the regression analysis of compressive strength and UPV. The water-to-binder ratio was set to 0.41, 0.33, and 0.28, and the NSH replacement rates in the cement were set to 0%, 15%, 30%, and 45% for evaluating various strength ranges. The mechanical property measurements indicated reductions of 5.35% in unit weight, 35.62% in compressive strength, and 6.34% in UPV as the NSH was replaced. Notably, the smallest deviation from plain concrete was observed at a replacement rate of 15%. The scanning electron microscopy analysis results showed that the plain concrete exhibited a crystalloid structure; however, as the NSH replacement rate increased, the amorphous structure and pores increased while unreacted NSH particles were also observed. The X-ray diffraction analysis results demonstrate that the peak intensities for kaolinite and mullite increased as the NSH replacement rate increased, while those of C–S–H gel and CaO showed low peak intensities. Furthermore, the regression analysis concluded that an exponential function was suitable. Consequently, a compressive strength prediction model was developed, and in the error test, the NSHC model demonstrated an average error of <10%, with fewer errors at the lower compressive strength boundaries.

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Section: Introductionmentioning

confidence: 99%

Strength Prediction of Non-Sintered Hwangto-Substituted Concrete Using the Ultrasonic Velocity Method

Im,

Kim,

Choi

et al. 2023

Materials

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“…When subjected to high temperatures, concrete undergoes various physical and chemical changes such as color alteration, strength loss, cracking, and fragmentation. This situation has led researchers to investigate the effects of aggregate type, cement type and dosage, fiber materials, supplementary cementitious materials (SCMs), and cooling regimes on cementitious composites exposed to high temperatures [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Effects of High Temperature and Cooling Regimes on Properties of Marble Powder-Based Cementitious Composites

Bayer,

Sevim,

Demir

2023

Buildings

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The demand for cement is increasing every day worldwide. To meet this demand, natural resources are rapidly being depleted. The excessive consumption of natural resources encourages researchers to conduct studies on the use of waste materials instead of cement. Marble waste is one of the major natural wastes abundantly generated worldwide. It has been evaluated that there is a gap in the literature regarding a study comparing the effects of different cooling regimes on cementitious composites with a marble powder (MP) replacement that has been exposed to high temperatures. In this study, waste marble powder (MP) was used as a replacement for cement at percentages of 5%, 10%, 15%, 20%, and 25% by mass. The water-to-binder ratio was kept constant at 0.5 for all mixture groups. Subsequently, the prepared cementitious composites were exposed to high temperatures (300 °C, 600 °C, and 800 °C) and subjected to air- and water-cooling regimes. Within the scope of this study, unit weight (Uw), ultrasonic pulse velocity (UPV), flexural strength (ffs), compressive strength (fcs), and mass loss tests were conducted. Additionally, a microstructure analysis was carried out using scanning electron microscopy (SEM) to examine the effect of MP replacement and the cooling regime. When examining the results of the samples tested in the laboratory, it was observed that the mortar with 5% MP replacement exhibited better mechanical properties compared with the others. In general, it can be said that the mechanical properties of samples cooled in air after exposure to high temperatures were better than those of samples cooled in water. As a result of this study, it was determined that MP replacement could positively contribute to the resistance of cementitious composites to high temperatures. Additionally, the use of a significant amount of waste MP can lead to savings in cement usage and significant reductions in CO2 emissions.

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“…Existence of waste from the construction sector and due to its adverse environmental effects, it is desirable to reutilize this waste and to promote a sustainable waste recycling. This has encouraged many researchers to creat some solutions to evaluate the construction and demolition wastes [1][2][3][4][5]. This is often applied to materials as asphalt, brick, concrete, ferrous metal, ceramics and glass [6].…”

Section: Introductionmentioning

confidence: 99%

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

Darweesh

2023

JSMPM

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Resistance of Portland cement pastes incorporated 20 wt. % sanitary ware ceramic nano-powder wastes to firing temperatures from 100 up to 600 ℃ was investigated. Results revealed that all physical and mechanical properties were improved and gradually enhanced with firing temperatures, but only up to 400 ℃, and then adversely affected with any further increase of firing temperatures than 400 ℃, i.e. water absorption and total porosity decreased, whereas bulk density was enhanced. Water absorption and total porosity were decreased by 10 and 4 %, respectively, while bulk density was increased by 2.25 %. Furthermore, flexural and compressive strengths were also improved and increased by 1.69 and 1.2 %, respectively. Fourier transform infrared spectra (FT-IR) showed the disappearance of free lime and ettringite on firing. Scanning electron microscopy (SEM) showed that the crystal phase growth of the formed hydration products as a result of both normal hydration and pozzolanic reactions at ambient temperature were developed and modified due to the temperature exposure. The hardened cement pastes can withstand and resist only up to 400 ℃.

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Experimental Evaluation of New Geopolymer Composite with Inclusion of Slag and Construction Waste Firebrick at Elevated Temperatures

Cited by 16 publications

References 60 publications

Strength Prediction of Non-Sintered Hwangto-Substituted Concrete Using the Ultrasonic Velocity Method

Strength Prediction of Non-Sintered Hwangto-Substituted Concrete Using the Ultrasonic Velocity Method

Effects of High Temperature and Cooling Regimes on Properties of Marble Powder-Based Cementitious Composites

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

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