Hydration Model and Evaluation of the Properties of Calcined Hwangtoh Binary Blends

Lee, Han-Seung; Wang, Xiao-Yong

doi:10.1186/s40069-020-00438-5

Cited by 26 publications

(23 citation statements)

References 34 publications

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“…Thermogravimetric analysis (SDT Q600, TA Instruments, USA) was used to characterize the samples cured at each temperature for 28 days to analyze the dehydration and thermal decomposition processes of the reaction phase [34,35]. About 30 mg of powder was placed in the ceramic crucible of the thermogravimetric analyzer and heated from 20 to 1000 • C at a heating rate of 15 • C/min.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature

et al. 2021

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This paper presents the effects of alkali-activated blast furnace slag and fly ash (AASF) paste added with waste ceramic powder (WCP) on mechanical properties, weight loss, mesoscopic cracks, reaction products, and microstructure when exposed to 300, 600, and 900 °C. Using waste ceramic powder to replace blast furnace slag and fly ash, the replacement rate was 0–20%. The samples cured at 45 °C for 28 days were heated to 300, 600, and 900 °C to determine the residual compressive strength and weight loss at the relevant temperature. We evaluated the deterioration of the paste at each temperature through mesoscopic images, ultrasonic pulse velocity (UPV), thermogravimetric analysis (TG), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and with a scanning electron microscope (SEM). Relevant experimental results show that: (1) with the increase in waste ceramic powder content, the compressive strength of samples at various temperatures increased, and at 300 °C, the compressive strength of all the samples reached the highest value; (2) the residual weight increased with the increase in the content of the waste ceramic powder; (3) with a further increase in temperature, all the samples produced more mesoscopic cracks; (4) at each temperature, with the rise in waste ceramic powder content, the value of the ultrasonic pulse velocity increased; (5) the TG results showed that, as the content of waste ceramic powder increased, the formation of C-A-S-H gel and hydrotalcite decreased; (6) XRD and FTIR spectra showed that, at 900 °C, the use of waste ceramic powder reduced the formation of harmful crystalline phases; (7) the SEM image showed that, at 900 °C, as the content of waste ceramic powder increased, the compactness of the sample was improved. In summary, the addition of waste ceramic powder can improve the mechanical properties of the alkali-activated paste at high temperatures, reduce the occurrence of cracks, and make the microstructure denser.

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Section: Thermogravimetric Analysismentioning

confidence: 99%

Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature

et al. 2021

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“…The weight loss at 550–900 °C is mainly the decarburization of CaCO 3 [ 30 ]. The sources of CaCO 3 in the product can be the carbonation generated during the preparation of the specimens and the presence of small amounts of CaCO 3 in the cement raw material [ 20 , 31 , 32 ]. Combined with Table 6 , we found that as the content of biochar increased, the weight loss at 20–300 and 300–550 °C decreased, indicating that the hydration products (CSH, AFt, Mc, and CH) were reduced as a result of the inhibition effect caused by the addition of biochar [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

Behavior of Biochar-Modified Cementitious Composites Exposed to High Temperatures

et al. 2021

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In this study, the effect of biochar on the high temperature resistance of cementitious paste was investigated using multiple experimental methods. The weight loss, cracks, residual compressive strength, and ultrasonic pulse velocity (UPV) of biochar cementitious paste with 2% and 5% biochar exposed to 300, 550 and 900 °C were measured. The products and microstructures of biochar cementitious paste exposed to high temperatures were analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The results showed that the cracks of specimens exposed to high temperatures decreased with increasing biochar content. The addition of 2% and 5% biochar increased the residual compressive strength of the specimens exposed to 300 °C and the relative residual compressive strength at 550 °C. As the exposure temperature increased, the addition of biochar compensated for the decreasing ultrasonic pulse velocity. The addition of biochar contributed to the release of free water and bound water, and reduced the vapor pressure of the specimen. The addition of biochar did not change the types of functional groups and crystalline phases of the products of cementitious materials exposed to high temperatures. Biochar particles were difficult to observe at 900 °C in scanning electron microscopy images. In summary, because biochar has internal pores, it can improve the high-temperature resistance of cement paste.

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“…The hydration heat release curve of the blended paste with different substitution amounts was changed to different degrees than the pure cement paste (C1-C100). Generally, the hydration process of cement can be divided into five periods: the initial period, the induction period, the acceleration period, the deceleration period, and the slow development period [ 33 , 34 ]. The induction period of the paste can be observed in Figure 3 a–c; it was found that the heat release of L2(C95L5) and M6(C92.5M7.5) in the induction stage was higher than that of the control specimen C1(C100), but the F10(C85F15) blended paste was lower than C1(C100).…”

Section: Resultsmentioning

confidence: 99%

Hydration–Strength–Workability–Durability of Binary, Ternary, and Quaternary Composite Pastes

Han

Wang

et al. 2021

Materials

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At present, reducing carbon emissions is an urgent problem that needs to be solved in the cement industry. This study used three mineral admixtures materials: limestone powder (0–10%), metakaolin (0–15%), and fly ash (0–30%). Binary, ternary, and quaternary pastes were prepared, and the specimens’ workability, compressive strength, ultrasonic pulse speed, surface resistivity, and the heat of hydration were studied; X-ray diffraction and attenuated total reflection Fourier transform infrared tests were conducted. In addition, the influence of supplementary cementitious materials on the compressive strength and durability of the blended paste and the sustainable development of the quaternary-blended paste was analyzed. The experimental results are summarized as follows: (1) metakaolin can reduce the workability of cement paste; (2) the addition of alternative materials can promote cement hydration and help improve long-term compressive strength; (3) surface resistivity tests show that adding alternative materials can increase the value of surface resistivity; (4) the quaternary-blended paste can greatly reduce the accumulated heat of hydration; (5) increasing the amount of supplementary cementitious materials can effectively reduce carbon emissions compared with pure cement paste. In summary, the quaternary-blended paste has great advantages in terms of durability and sustainability and has good development prospects.

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Hydration Model and Evaluation of the Properties of Calcined Hwangtoh Binary Blends

Cited by 26 publications

References 34 publications

Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature

Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature

Behavior of Biochar-Modified Cementitious Composites Exposed to High Temperatures

Hydration–Strength–Workability–Durability of Binary, Ternary, and Quaternary Composite Pastes

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