Effect of High-Temperature Curing Methods on the Compressive Strength Development of Concrete Containing High Volumes of Ground Granulated Blast-Furnace Slag

Jung, Won Hoon; Choi, Se‐Jin

doi:10.1155/2017/7210591

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…Hiremath et al [46] studied the development of early strength of shotcrete under the conditions of hot water bath and hot air curing; they found that the early strength of shotcrete showed an upward trend with the increase of temperature and that hot water bath Hiremath et al [46] studied the development of early strength of shotcrete under the conditions of hot water bath and hot air curing; they found that the early strength of shotcrete showed an upward trend with the increase of temperature and that hot water bath curing was conducive to the development of early strength of shotcrete. Wonsuk et al [47] studied slag shotcrete and found that under high-temperature conditions, the output of CO 2 in cement decreased and the early strength of shotcrete was significantly improved. The linear expansion value of slag shotcrete is very low and the pozzolanic activity is high, which is conducive to the development of shotcrete strength at the later stage [48].…”

Section: Influence Of High Temperature On Shotcrete Structurementioning

confidence: 99%

Mechanical Properties and Microstructure of Shotcrete under High Temperature

Liu

Zhao

Zhang³

et al. 2021

Applied Sciences

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High temperature is recognized as one of the extreme environments in the application of shotcrete which significantly deteriorate the performance of shotcrete. This paper reviews the mechanical properties and microstructure of shotcrete under high temperature. First of all, this paper reviews the cause of formation of high ground temperature. Based on these causes, the author establishes a heat transfer model with a spiral shape by introducing a multidimensional morphological formula into the heat conduction process. Then, the paper reviews the influence of high temperature on the mechanical and micro properties of shotcrete, the cooling technology under high temperature, and the optimization research technology of shotcrete. The author discusses the influence of high temperature on the thermal parameters and the deformation of shotcrete from the perspective of thermodynamics. Multiple studies have shown that the irregular movement and disorderly overlapping of molecules in the shotcrete caused by the high temperature environment result in the premature termination of the hydration reaction of cement in shotcrete. Finally, the author suggests the challenges of high-temperature shotcrete in term of the process structure, performance optimization, and application in special engineering fields. The research in this paper intends to give guidance to those conducting shotcrete research under high temperature, and to promote the further development of shotcrete technology.

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Section: Influence Of High Temperature On Shotcrete Structurementioning

confidence: 99%

Mechanical Properties and Microstructure of Shotcrete under High Temperature

Liu

Zhao

Zhang³

et al. 2021

Applied Sciences

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“…Although these three SCMs have little influence on hydration products, they can improve the sulfate resistance of steam-cured concrete. However, compared with the SCMs mentioned above, ground blast furnace slag (GBFS) is the most widely used in prefabricated components at present [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The Early Age Hydration Products and Mechanical Properties of Cement Paste Containing GBFS under Steam Curing Condition

Tang

Huo

et al. 2022

Buildings

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The hydration products and strength of cement pastes incorporated with ground blast furnace slag (GBFS) (0% and 20% replacement) have been investigated under steam curing condition (80 °C for 7 h and 7 d) in comparison with normal curing condition (moist curing for 28 d). The results show that, during the initial 80 °C steam curing for 7 h, in addition to the filler effect, GBFS is still involved in cement hydration. The abundant available Al phase and Mg phase in GBFS promote the formation of flake-like hydrotalcite, foil-like C-(A)-S-H gels, as well as equant grain-shaped C-(A)-S-H gels. Prolonging the steam curing time to 7 d further improves the formation of hydrogarnet. Since the formation of both hydrogarnet and hydrotalcite can consume the available Al, steam curing for 7 d seems to favor the formation of low Al C-(A)-S-H gels. In addition, due to the formation of a large amount of hydration products, the influence of 20% GBFS addition on the demolding strength of initial steam-cured cement mortar (80 °C for 7 h) is almost negligible. However, further extending the steam curing time to 7 d increases the strength gap between 20% GBFS blended cement mortar and pure cement mortar, and the related mechanism is discussed.

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“…However, with the deep development of underground engineering, high temperature is often seen in tunnel and mine construction. [5][6][7] On the one hand, it is due to the violent movement of magma, and on the other hand, surface water and original groundwater are heated by deep high-temperature rock masses to form high hot spring water and steam, which continuously release heat, resulting in a sharp increase of heat in construction roadway space. [8][9][10][11] Whereas, as a kind of heterogeneous brittle mixed material, when the ambient temperature exceeds the temperature that the shotcrete can resist, the concrete structure will crack, [12][13][14] resulting in great changes in the durability, heat insulation and adhesion of the shotcrete.…”

Section: Introductionmentioning

confidence: 99%

“…As an advanced geotechnical engineering construction technology, shotcrete (New Austrian Tunneling Method) is widely used in underground engineering, such as mine roadway, railway (highway) tunnel, subway and so on, for roadway surrounding rock control and support 1–4 . However, with the deep development of underground engineering, high temperature is often seen in tunnel and mine construction 5–7 . On the one hand, it is due to the violent movement of magma, and on the other hand, surface water and original groundwater are heated by deep high‐temperature rock masses to form high hot spring water and steam, which continuously release heat, resulting in a sharp increase of heat in construction roadway space 8–11 .…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation on mechanical and thermal insulation properties of shotcrete under constant‐variable temperature

Chen

Zhao

Meng

et al. 2022

Structural Concrete

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One of the commonly used stabilization systems for rock tunnel is shotcrete. However, the hydration of shotcrete is usually accompanied by the development of internal defects and micro damage under high temperature. Additionally, in the actual high‐temperature engineering, the temperature of the rock tunnel exhibits irregular changes. Therefore, in this study, the curing conditions of constant temperature (23°C, 40°C, 60°C, 80°C) and variable temperature (23–40–60–80°C, 80–60–40–23°C) are set, respectively. The mechanical properties and structural properties of polyurethane shotcrete and ordinary Portland shotcrete are introduced. It is determined that the limit temperature for inhibiting the development of sprayed concrete's compressive and splitting strength is between 60°C and 80°C, and the limit temperature for inhibiting the development of bond strength is about 40°C. Meanwhile, the influence of high temperature on the thermal insulation performance of shotcrete is considered. The results that the self‐foaming performance of polymer(polyurethane) reduces the thermal conductivity of shotcrete. Based on this phenomenon, the heat transfer model of shotcrete at room and high temperature is established to clarify the heat transfer process of shotcrete. Results will provide theoretical basis for further research of durability and heat insulation performance of protective spraying material for tunnel under high temperature.

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Effect of High-Temperature Curing Methods on the Compressive Strength Development of Concrete Containing High Volumes of Ground Granulated Blast-Furnace Slag

Cited by 9 publications

References 13 publications

Mechanical Properties and Microstructure of Shotcrete under High Temperature

Mechanical Properties and Microstructure of Shotcrete under High Temperature

The Early Age Hydration Products and Mechanical Properties of Cement Paste Containing GBFS under Steam Curing Condition

Experimental evaluation on mechanical and thermal insulation properties of shotcrete under constant‐variable temperature

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