Macro–meso–micro experimental studies of calcined clay limestone cement (LC3) paste subjected to elevated temperature

Lin, Run-Sheng; Han, Yi; Wang, Xiao-Yong

doi:10.1016/j.cemconcomp.2020.103871

Cited by 80 publications

(25 citation statements)

References 50 publications

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“…The peak at 1465 cm −1 is related to the asymmetric stretching vibration of the C–O bond. The absorption peak of the stretching vibration of the Si–O bond in SiO 2 was in the range of 670–661 cm −1 [ 48 ]. The presence of the O–H bond absorption peak may be related to the alkali solution in the mixture.…”

Section: Resultsmentioning

confidence: 99%

Effect of Waste Ceramic Powder on Properties of Alkali-Activated Blast Furnace Slag Paste and Mortar

et al. 2021

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Every year, ceramic tile factories and the iron smelting industry produce huge amounts of waste ceramic tiles and blast furnace slag (BFS), respectively. In the field of construction materials, this waste can be used as a raw material for binders, thus reducing landfill waste and mitigating environmental pollution. The purpose of this study was to mix waste ceramic powder (WCP) into BFS paste and mortar activated by sodium silicate and sodium hydroxide to study its effect on performance. BFS was partially replaced by WCP at the rate of 10–30% by weight. Some experimental studies were conducted on, for example, the fluidity, heat of hydration, compressive strength testing, ultrasonic pulse velocity (UPV), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), electrical resistivity, sulfuric acid attack, and chloride ion diffusion coefficient. Based on the results of these experiments, the conclusions are: (1) increasing the amount of waste ceramic powder in the mixture can improve the fluidity of the alkali-activated paste; (2) adding waste ceramic powder to the alkali-activated mortar can improve the resistance of the mortar to sulfuric acid; (3) adding waste ceramic powder to the alkali-activated mortar can increase the diffusion coefficient of chloride ions; (4) the early strength of alkali-activated mortar is affected by the Ca/Si ratio, while the later strength is affected by the change in the Si/Al ratio.

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Section: Resultsmentioning

confidence: 99%

Effect of Waste Ceramic Powder on Properties of Alkali-Activated Blast Furnace Slag Paste and Mortar

et al. 2021

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“…The absorption peaks of the spectrum corresponding to the samples containing SAP at 954 cm −1 were significantly greater than those of the other two groups. The relative absorption peaks more obviously increased when the SAP content increased, which was attributed to the reaction of the C 3 S clinker at 800–970 cm −1 and the C-S-H formed by silica polymerization [ 46 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste

Xuan

Wang

et al. 2021

Materials

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This study focuses on the effects of superabsorbent polymers (SAP) and belite-rich Portland cement (BPC) on the compressive strength, autogenous shrinkage (AS), and micro- and macroscopic performance of sustainable, ultra-high-performance paste (SUHPP). Several experimental studies were conducted, including compressive strength, AS, isothermal calorimetry, X-ray diffraction (XRD), thermogravimetric analysis (TGA), attenuated total reflectance (ATR)–Fourier-transform infrared spectroscopy (FTIR), ultra-sonic pulse velocity (UPV), and electrical resistivity. The following conclusions can be made based on the experimental results: (1) a small amount of SAP has a strength promotion effect during the first 3 days, while BPC can significantly improve the strength over the following 28 days. (2) SAP slows down the internal relative humidity reduction and effectively reduces the development of AS. BPC specimens show a lower AS than other specimens. The AS shows a linear relationship with the internal relative humidity. (3) Specimens with SAP possess higher cumulative hydration heat than control specimens. The slow hydration rate in the BPC effectively reduces the exothermic heat. (4) With the increase in SAP, the calcium hydroxide (CH) and combined water content increases, and SAP thus improves the effect on cement hydration. The contents of CH and combined water in BPC specimens are lower than those in the ordinary Portland cement (OPC) specimen. (5) All samples display rapid hydration of the cement in the first 3 days, with a high rate of UPV development. Strength is an exponential function of UPVs. (6) The electrical resistivity is reduced due to the increase in porosity caused by the release of water from SAP. From 3 to 28 days, BPC specimens show a greater increment in electrical resistivity than other specimens.

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“…Based on the comparison of the results between 20 and 300 °C, the following results were obtained: At 20 °C, the two absorption peaks near 3399 and 1647 cm −1 represent the vibration of H-O in free water, and at 300 °C, these two peaks disappeared. At 20 °C, the absorption peak near 1415 cm −1 is the asymmetrical stretching vibration of C-O in Mc, and at 300 °C, it changed to a higher band (1420 cm −1 ) and the intensity decreased, indicating that Mc decomposed [ 21 ], as showed in Figure 5 b. At 300 °C, the SO 4 2- peak of AFt disappeared, indicating that AFt decomposed.…”

Section: Resultsmentioning

confidence: 99%

“…For 900 °C, the absorption peaks at 994, 890, and 844 cm −1 were the vibrations of Si(Al)-O in the products of complete decomposition of CS(A)H [ 21 , 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…(3) The weight loss percentage with exposure to 550-900 • C increased with the increase in the biochar content. In this temperature range, the weight loss of the specimen mainly included the decomposition of the hydration product CSH [20,21] and the ignition loss of biochar. From the results in Table 4, we did not observe the black biochar in the CB2 and CB5 specimens at 900 • C. Therefore, we consider that the weight loss in the temperature range of 550-900 • C includes the ignition loss of a large amount of biochar.…”

Section: Macro Weight Lossmentioning

confidence: 99%

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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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Macro–meso–micro experimental studies of calcined clay limestone cement (LC3) paste subjected to elevated temperature

Cited by 80 publications

References 50 publications

Effect of Waste Ceramic Powder on Properties of Alkali-Activated Blast Furnace Slag Paste and Mortar

Effect of Waste Ceramic Powder on Properties of Alkali-Activated Blast Furnace Slag Paste and Mortar

Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste

Behavior of Biochar-Modified Cementitious Composites Exposed to High Temperatures

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