Untersuchung von gefriervorgǎngen in zementstein mit hilfe der DTA.

Stockhausen, N.; Dorner, H.; Zech, B.; Setzer, Μ.J.

doi:10.1016/0008-8846(79)90074-7

Cited by 28 publications

(3 citation statements)

References 9 publications

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“…The freezing point of this component is currently the subject of mixed conclusions. According to the results of DTA analysis by Stockhausen et al [53], adsorbed water does not undergo phase change in the range of − 160 °C. In contrast, studies by Ubelhack [54] and Zech [55] showed that this water freezes between − 60 ~ − 130 °C.…”

Section: Phase Change Of Pore Water In Concretementioning

confidence: 98%

“…These pores are filled in an environment where the concrete is stored between 60% and 90% relative humidity. Stockhausen et al [53] use Differential Thermal Analysis (DTA) on the cement stone's freezing point of gel water is about − 43 °C. (4) Adsorbed water: A layer of about one to two and a half water molecules adsorbed on the solid surface, filling in pores with a radius of about 1.5 nm.…”

Section: Phase Change Of Pore Water In Concretementioning

confidence: 99%

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Mechanical properties of concrete at low and ultra-low temperatures- a review

Huo

Sun

et al. 2022

J Infrastruct Preserv Resil

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As infrastructure construction advances toward the cold and highland environment, concrete preparation technology and service performance in the cold climate is receiving much attention. The freezing of pore water inside concrete leads to significant changes in its mechanical properties at negative temperatures. Therefore, to ensure the safety of civil engineering structures in cold regions, it is necessary to fully understand the change law and enhancement mechanism of the mechanical properties of concrete and be able to predict mechanical properties at a negative temperature. Since the 1970s, scholars have studied concrete’s negative temperature mechanical properties in different water-content states. This paper presents a comprehensive review of the changes in mechanical properties of concrete at low and ultra-low temperatures and further elucidates the evolution of its compressive strength, tensile strength, flexural strength, elastic modulus, and stress-strain relationship at low temperatures. It was found that the main factors affecting the mechanical properties of concrete at low temperatures were temperature and moisture content. The strength of concrete increases significantly with the decrease in temperature and the increase in moisture content. To better understand and predict the mechanical properties of concrete at low temperatures, the best model was suggested by analyzing the prediction models of different researchers and considering the dispersion of the data. Further, based on the G. Wiedemann pore model, the changes in the internal structure of concrete at low temperatures are described in detail, and the mechanism of its mechanical property enhancement is analyzed.

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Section: Phase Change Of Pore Water In Concretementioning

confidence: 98%

Section: Phase Change Of Pore Water In Concretementioning

confidence: 99%

Mechanical properties of concrete at low and ultra-low temperatures- a review

Huo

Sun

et al. 2022

J Infrastruct Preserv Resil

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“…Previous research has found that water existing in voids of 100 to 1000 nm freezes and expands and destroys hardened concrete (Kamada 1981). It is said that voids of 6 to 20 nm and of 10000 to 90000 nm reduce deterioration due to freezing and thawing because water existing in voids of 6 to 20 nm does not freeze until −43°C and voids of 10000 to 90000 nm absorb the stress produced by the freezing and expansion of the water existing in voids of 100 to 1000 nm (Stockhausen et al 1979). The voids of 10000 to 90000 nm shown in Fig.…”

Section: Number Of Freeze-thaw Repetitions (Cycles) Mass Residual Rat...mentioning

confidence: 99%

Freeze-thaw Resistance of Concrete using Ground Granulated Blast-furnace Slag and Blast-furnace Slag Sand in Salt Water

Ayano,

Fujii,

Okazaki

2024

ACT

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The freeze-thaw resistance of concrete is significantly lower in salt water than in fresh water. Concrete deteriorates through repeated freezing and thawing, but in salt water, freezing alone leads to destruction. This paper investigated the effect of calcium hydroxide in concrete on the failure of concrete under such low temperatures. Calcium hydroxide precipitates at the transition zone between aggregate and cement paste due to the hydration of cement. The lower the temperature and the higher the concentration of salt water, the more calcium hydroxide dissolves. From concrete, more calcium hydroxide is eluted in salt water than in fresh water. This accelerates the deterioration of mortar and concrete due to freeze-thaw action. Mortar and concrete using ground granulated blast-furnace slag produces less calcium hydroxide. In mortar and concrete using blast-furnace slag sand, calcium hydroxide precipitated around the aggregate reacts with cement paste and blast-furnace slag sand to modify the transition zone. From these results, it was clarified that concrete using blast-furnace slag exhibits high freeze-thaw resistance even in salt water. This paper is the English translation of the authors' previous work [Ayano, T., Fujii, T. and Okazaki, K., (2023). "Freezethaw resistance of concrete using ground granulated blast-furnace and blast-furnace slag sand in salt water." Japanese Journal of JSCE, 79(12),[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]].

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Thermal Conductivity of Concrete Mortar

Sparks¹

1983

Thermal Conductivity 17

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Untersuchung von gefriervorgǎngen in zementstein mit hilfe der DTA.

Cited by 28 publications

References 9 publications

Mechanical properties of concrete at low and ultra-low temperatures- a review

Mechanical properties of concrete at low and ultra-low temperatures- a review

Freeze-thaw Resistance of Concrete using Ground Granulated Blast-furnace Slag and Blast-furnace Slag Sand in Salt Water

Thermal Conductivity of Concrete Mortar

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