Dynamic Compressive Performance of Concrete Exposed to High Temperature Based on Microstructure Analysis

Yang, Shao Wei; Liu, Zhi Guo; Wang, Yong Wei; Liu, Zi Rui; Ba, Heng Jing

doi:10.4028/www.scientific.net/amm.357-360.1389

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…On the other hand, above 600°C, the CaCO 3 decomposition is detectable using the thermal analysis/ chemical analysis coupling method 11 or thermogravimetric-differential thermal analysis (TG-DTA). 9 Furthermore, above 720°C, the decomposition forms active CaO that can react with SiO 2 to form calcium silicate in accordance with the following reaction: 12,[18][19][20] 2 CaO+SiO 2 ® Ca 2 SiO 4…”

Section: Resultsmentioning

confidence: 99%

“…3 The effect of a high-temperature exposure on concrete has been wildly researched. [4][5][6][7][8][9] It was demonstrated that when exposed to high temperatures, water evaporation, disintegration of hydration products and aggregates, coarsening of the microstructure and an increase in the porosity can be observed in concrete. 4,5 Most of all, with the increasing temperature, the strength and elastic modulus of concrete became lower and lower.…”

Section: Introductionmentioning

confidence: 99%

“…Microcracks in cement pastes and concretes consisting of mortar mixed with sand were deformed at about 200°C. 8 However, the research on the effect of high temperatures on the microstructural change of concrete is mainly focused on microcracks, 8,9 while reports on the micromorphological change of cement are lacking.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of high-temperature-induced damage to concrete

Zhang¹,

Wu²,

Guo³

et al. 2019

Mater. Tehnol.

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The evaluation of high-temperature-induced damage to an ordinary Portland cement concrete was carried out. Results showed that the uniaxial compressive strength of the concrete linearly decreased with the increasing exposure temperature. After a high-temperature exposure, the concrete was more easily deformed under loading. The as-received cement was dense and free of obvious holes. The cement and the aggregate were bonded tightly, and no cracks were observed. Above 200°C, dehydration and decomposition of calcium silicate hydrate during the high-temperature exposure led to small holes, formed in the cement, and microcracks at the bonding aggregate/cement interface. With the increasing exposure temperature, the small holes formed in the cement grew up and the microcracks located at the aggregate/cement interface gradually expanded into a coherent crack network. Above 600°C, the cement was significantly locally pulverized and the microcracks at the aggregate/cement interface were further broadened. Below 400°C, detected phases of the exposed mortar sample were the same as those of the as-received mortar. After exposures to 600°C and 800°C, peaks of CaO were also detected besides the pre-existing phases. The reaction between CaO and SiO2 enhanced the decomposition of CaCO3 while promoting the formation of Ca2SiO4.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of high-temperature-induced damage to concrete

Zhang¹,

Wu²,

Guo³

et al. 2019

Mater. Tehnol.

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show abstract

“…Since impact loads and the heating occur more frequently in structures, dynamic mechanical properties of engineering materials have been investigated (Yin et al 2015(Yin et al , 2018a(Yin et al , 2018bLi et al 2016;Fu et al 2017), as well as those subjected to the heat treatment (Li et al 2012;Huo et al 2013). For example, Yang et al (2013) discovered that the dynamic compressive strength decreases with the increasing temperature by carried out the dynamic experiment on heat-treated concrete, indicating that dynamic mechanical properties also are obviously influenced by the temperature.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Effect on the Physical and Dynamic Compressive Properties of Pre-Stressed Cement Mortar

Shu

Lizhong

Yin

2019

ACT

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Cement mortars are extensively used in tunnels and underground facilities, where the risk of high temperatures due to fires and explosions triggered by traffic accidents, earthquakes or electrical malfunctions cannot be ruled out. It is necessary, therefore, to know the mechanical properties of cement mortars at high temperature in both static and dynamic conditions. The dynamic mechanical behavior of pre-stressed cement mortars at high temperature is investigated in this research project, from 25 to 300°C, by means of the Hopkinson bar. The microstructure of cement mortars is also studied via Scanning Electron Microscopy-SEM. The properties under investigation are: density, coefficient of thermal expansion, dynamic compressive strength, peak strain, dynamic elastic modulus and damage variables, as well as the longitudinal wave velocity. The tests indicate that the physical and dynamic mechanical properties of cement mortars are significantly affected by high temperature. In the range 25-300°C, because of the increasing number and size of the microdefects (microcracks), the density and the longitudinal wave velocity exhibit a gradual less-than-linear decline, while the decline of the compressive strength and elastic modulus is more marked (roughly linear), the peak strain and damage almost increase linearly.

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Thermal degradation of dynamic compressive strength for two mortars

Yao

Liu

et al. 2017

Construction and Building Materials

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Dynamic Compressive Performance of Concrete Exposed to High Temperature Based on Microstructure Analysis

Cited by 5 publications

References 7 publications

Evaluation of high-temperature-induced damage to concrete

Evaluation of high-temperature-induced damage to concrete

High-Temperature Effect on the Physical and Dynamic Compressive Properties of Pre-Stressed Cement Mortar

Thermal degradation of dynamic compressive strength for two mortars

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