Influence of high temperature on the residual physical and mechanical properties of foamed concrete

Tan, Xianjun; Chen, Weizhong; Wang, Jiuhong; Qi, Xianyin; Ma, Yongshang; Wang, Xu; Ma, Shaosen; Li, Changjun

doi:10.1016/j.conbuildmat.2016.12.223

Cited by 62 publications

(19 citation statements)

References 19 publications

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“…Its mathematical expressions could be depicted as linear, exponential, power, and logarithmic. After the test data analysis, we found that the compressive strength increased approximately exponentially with an increase in density [26], and R 2 reached 0.994. e expression is as given below:…”

Section: Uniaxial Compressive Test Of Foamed Concretementioning

confidence: 99%

“…(2) Servo-controlled testing system (RMT-150B) is manufactured by the Institute of Rock and Soil Mechanics, the Chinese Academy of Sciences. is system can be used to conduct many types of tests, such as uniaxial compression, triaxial compression, tension, and fatigue tests [26,32,33]. Its maximum load is 1000 kN and the maximum confining pressure is 40 MPa.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Based on the unique advantages of magnesium phosphate cement, Ma and Chen [25] used sodium bicarbonate as a foaming agent and developed new quicksetting and high-early-strength FC. Tan et al [26] conducted a series of tests to investigate the influence of high temperature on the FC properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study and Application of a Novel Foamed Concrete to Yield Airtight Walls in Coal Mines

Wen

Fan

Zhang

et al. 2018

Advances in Materials Science and Engineering

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Airtight walls are vital to prevent spontaneous combustion of residual coal as caused by air leakage. A new type of foamed concrete (FC) was developed to control air leakage. FC specimens of four densities (250, 450, 650, and 850 kg/m 3 ) were prepared for use in a series of physical and mechanical tests. A thickener was used to control the FC shrinkage and collapse. e permeability of the FC decreased approximately exponentially with an increasing density. On the contrary, the compressive strength (σ) and elastic modulus (E) increased in exponential and linear relationship separately with the increase in density, under uniaxial compression conditions. Under triaxial compression, the compressive strength of the FC increased with an increase in confining pressure and appeared slight plastic. e impact experiment showed that the dynamic compressive strength of the FC appeared to be strain-rate dependent, and it increased with an increase in the strain rate and pressure under a confining pressure. Without a confining pressure, the variation in compressive strength exhibited a slow decrease. Applied FC resulted in a 5 MPa 28-day compressive strength of the airtight wall with no remaining fissures and with air leakage suppression to the gob.

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Section: Uniaxial Compressive Test Of Foamed Concretementioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%

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Experimental Study and Application of a Novel Foamed Concrete to Yield Airtight Walls in Coal Mines

Wen

Fan

Zhang

et al. 2018

Advances in Materials Science and Engineering

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“…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%

“…4,5 Most of all, with the increasing temperature, the strength and elastic modulus of concrete became lower and lower. 6,7 A study on the microstructure of concrete at high temperatures revealed that microcracks initiated around the boundaries of aggregates and propagated with the increasing temperature. Microcracks in cement pastes and concretes consisting of mortar mixed with sand were deformed at about 200°C.…”

Section: Introductionmentioning

confidence: 99%

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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Effects of strain rate, temperature and freeze–thaw cycle on the mechanical properties of cement mortar composite specimen

Liu

Wei

2020

Structural Concrete

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The effects of the strain rate, water/cement ratio, temperature and number of freeze–thaw cycle on the ultimate compressive strength, peak strain and elastic modulus of cement mortar composite specimens were studied using uniaxial compression test. Test results show that: (a) The strength difference of cement mortar composite specimens is not significant when the axial loading direction is parallel to the interface of two components with different water/cement ratios under low strain rate loading. The strength of cement mortar composite specimens mainly depends on the one with lower strength, and the strength of cement mortar specimen with high strength is more sensitive to the strain rate than that of cement mortar specimen with low strength. (b) With the increase of temperature from 25°C (room temperature) to 500°C, the strength of the specimen with high compressive strength will increase first and then decrease. Nevertheless the strength of the specimen with low compressive strength will gradually decrease. The strength of cement mortar composite specimen will decrease with increased number of freeze–thaw cycle. (c) Under the same strain rate, after the same high temperature or the same number of freeze–thaw cycle, the peak strain of the composite specimens composed of two water/cement ratio components is much larger than that of the specimen composed of only one component; conversely, the elastic modulus shows an opposite trend.

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Influence of high temperature on the residual physical and mechanical properties of foamed concrete

Cited by 62 publications

References 19 publications

Experimental Study and Application of a Novel Foamed Concrete to Yield Airtight Walls in Coal Mines

Experimental Study and Application of a Novel Foamed Concrete to Yield Airtight Walls in Coal Mines

Evaluation of high-temperature-induced damage to concrete

Effects of strain rate, temperature and freeze–thaw cycle on the mechanical properties of cement mortar composite specimen

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