Study on compressive mechanical capabilities of concrete after high temperature exposure and thermo-damage constitutive model

Zhai, Yue; Deng, Zichen; Li, Nan; Rui, Xu

doi:10.1016/j.conbuildmat.2014.06.052

Cited by 52 publications

(15 citation statements)

References 6 publications

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“…After the freeze-thaw cycle tests, the surface layers of the concrete specimens had different degrees of damage, as shown in Figure 2. From the figure, the following can be observed: Firstly, the freeze-thawed concrete specimens were heated to 80°C and held for 24 hours to evaporate free water and capillary water [6]. en, the temperature was elevated to the exposure temperature designed in Table 2 at a rate of 4°C/ min and kept constant for 3 h. Finally, the specimens were taken out of the furnace and then cooled by spray water or air-cooling.…”

Section: Observations Of Specimens After Freeze-aw Cyclesmentioning

confidence: 99%

“…Based on the test results and using the least-squares method, the parameters in constitutive model equation (6) are determined and are shown in Table 3 and equations (8) and (9):…”

Section: Constitutive Model Of Concrete After Freeze-thaw Cycles and mentioning

confidence: 99%

“…Many researchers have investigated the performance of the concrete after exposure to high temperatures, including the change in the microstructure [1][2][3], the degradation of mechanical performance of ordinary concrete [4][5][6][7] and high-strength concrete [8,9], and the effect of different cooling methods [10,11]. It is noted that the mechanical behavior of concrete (both ordinary concrete and highperformance concrete) after exposure to high temperatures degraded to different degrees and is affected by cooling methods.…”

Section: Introductionmentioning

confidence: 99%

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Degradation Behavior of Concrete after Freeze-Thaw Cycles and Then Exposure to High Temperatures

Xie

Yang

et al. 2019

Advances in Materials Science and Engineering

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Concrete behavior usually degrades due to freeze-thaw cycles, fire, or both. Existing studies on the degradation behavior of concrete due to exposure to high temperatures were primarily focused on unfrozen concrete. In this paper, the degradation behavior of damaged concrete, after different freeze-thaw cycles (25, 35, 45, and 55 cycles), exposure temperatures (20°C, 300°C, 400°C, and 500°C), and cooling methods (water-cooled and air-cooled), was tested with seventy-five prism specimens. The degradation behavior of the damaged concrete, such as surface characteristics, weight loss, compressive strength, peak strains, and elastic modulus, was studied and analyzed. Results show that (i) the surface color of the concrete does not change significantly throughout the test. As the number of freeze-thaw cycles and temperatures increase, the weight loss of the concrete specimens increases gradually. (ii) After freeze-thaw cycles, the relative strengths and elastic modulus of the concrete specimens significantly degrade compared with those of the unfrozen ones at same temperatures. (c) At elevated number of freeze-thaw cycles and exposure temperatures, the peak strain of the concrete increases gradually. (d) Cooling methods have different effects on the degradation of concrete under different number of freeze-thaw cycles. Finally, a uniaxial compression constitutive model for concrete after freeze-thaw cycles and then exposure to high temperatures was established and a good agreement was observed with test results.

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Section: Observations Of Specimens After Freeze-aw Cyclesmentioning

confidence: 99%

“…Based on the test results and using the least-squares method, the parameters in constitutive model equation (6) are determined and are shown in Table 3 and equations (8) and (9):…”

Section: Constitutive Model Of Concrete After Freeze-thaw Cycles and mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Degradation Behavior of Concrete after Freeze-Thaw Cycles and Then Exposure to High Temperatures

Xie

Yang

et al. 2019

Advances in Materials Science and Engineering

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“…Thermal damage in cementitious composites represents a topic of key interest for controlling strength, durability and serviceability conditions of concrete structural components [1]. The most relevant thermo-physical and mechanical properties of cement-based composites (i.e., cohesion, friction, stiffness, strength, cracked configurations and durability parameters) suffer severe degradation as a result of long-term exposure to high temperatures [2,3]. Many factors influence the thermo-hygro-chemo-mechanical response of cement-based composites, which can be grouped in two main categories [4]: (i) the material or composite factors and (ii) the environmental (conditioning) factors.…”

Section: Introductionmentioning

confidence: 99%

Thermal Action on Normal and High Strength Cement Mortars

et al. 2020

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High temperature effect on cement-based composites, such as concrete or mortars, represents one of the most important damaging process that may drastically affect the mechanical and durability characteristics of structures. In this paper, the results of an experimental campaign on cement mortars submitted to high temperatures are reported and discussed. Particularly, two mixtures (i.e., Normal (MNS) and High Strength Mortar (MHS)) having different water-to-binder ratios were designed and evaluated in order to investigate the incidence of both the mortar composition and the effects of thermal treatments on their physical and mechanical properties. Mortar specimens were thermally treated in an electrical furnace, being submitted to the action of temperatures ranging from 100 to 600 °C. After that and for each mortar quality and considered temperature, including the room temperature case of 20 °C, water absorption was measured by following a capillary water absorption test. Furthermore, uniaxial compression, splitting tensile and three-points bending tests were performed under residual conditions. A comparative analysis of the progressive damage caused by temperature on physical and mechanical properties of the considered mortars types is presented. On one hand, increasing temperatures produced increasing water absorption coefficients, evidencing the effect of thermal damages which may cause an increase in the mortars accessible porosity. However, under these circumstances, the internal porosity structure of lower w/b ratio mixtures results much more thermally-damaged than those of MNS. On the other hand, strengths suffered a progressive degradation due to temperature rises. While at low to medium temperatures, strength loss resulted similar for both mortar types, at higher temperature, MNS presented a relatively greater strength loss than that of MHS. The action of temperature also caused in all cases a decrease of Young’s Modulus and an increase in the strain corresponding to peak load. However, MHS showed a much more brittle behavior in comparison with that of MNS, for all temperature cases. Finally, the obtained results demonstrated that mortar quality cannot be neglected when the action of temperature is considered, being the final material performance dependent on the physical properties which, in turn, mainly depend on the mixture proportioning.

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“…The effects of high temperature on the mechanical properties of concrete have been investigated since long time [1][2][3][4]. The fire resistance capacity of concrete is very complicated.…”

Section: Introductionmentioning

confidence: 99%

Application of Taguchi method for optimization of concrete strengthened with polymer after high temperature

Tanyıldızı

Şahin

2015

Construction and Building Materials

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Study on compressive mechanical capabilities of concrete after high temperature exposure and thermo-damage constitutive model

Cited by 52 publications

References 6 publications

Degradation Behavior of Concrete after Freeze-Thaw Cycles and Then Exposure to High Temperatures

Degradation Behavior of Concrete after Freeze-Thaw Cycles and Then Exposure to High Temperatures

Thermal Action on Normal and High Strength Cement Mortars

Application of Taguchi method for optimization of concrete strengthened with polymer after high temperature

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