EFFECT OF CURING SYSTEM ON RESIDUAL MECHANICAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE EXPOSED TO ELEVATED TEMPERATURE

OUYANG Lijun; QIAN Peng; GAO Wanyang; DING Bin; WANG Qing

doi:10.13204/j.gyjzG201905290010

Volume 50 Issue 8

Oct. 2020

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OUYANG Lijun, QIAN Peng, GAO Wanyang, DING Bin, WANG Qing. EFFECT OF CURING SYSTEM ON RESIDUAL MECHANICAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE EXPOSED TO ELEVATED TEMPERATURE[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(8): 92-100. doi: 10.13204/j.gyjzG201905290010

Citation:

OUYANG Lijun, QIAN Peng, GAO Wanyang, DING Bin, WANG Qing. EFFECT OF CURING SYSTEM ON RESIDUAL MECHANICAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE EXPOSED TO ELEVATED TEMPERATURE[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(8): 92-100. doi: 10.13204/j.gyjzG201905290010

Citation:

OUYANG Lijun, QIAN Peng, GAO Wanyang, DING Bin, WANG Qing. EFFECT OF CURING SYSTEM ON RESIDUAL MECHANICAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE EXPOSED TO ELEVATED TEMPERATURE[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(8): 92-100. doi: 10.13204/j.gyjzG201905290010

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EFFECT OF CURING SYSTEM ON RESIDUAL MECHANICAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE EXPOSED TO ELEVATED TEMPERATURE

doi: 10.13204/j.gyjzG201905290010

1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;
2. School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
3. Wenzhou Vocational & Technical College, Wenzhou 325035, China

Received Date: 2019-05-29

Abstract

Abstract

Axial compressive tests were conducted on 48 UHPC (ultra-high performance concrete) cubes cured under sprinkler curing, hot water curing, sprinkler-dry air combined curing, and hot water and dry air combined curing respectively to investigate residual compressive strength of heat-damaged. Axial tensile tests were conducted on 18 dumbbell-shaped specimens cured under hot water curing and hot water and dry air combined curing respectively to investigate the residual tensile strength. The test results showed that compared with the corresponding mono-curing regime, the compressive strength of the specimens subjected to sprinkling-dry air (105 ℃) combined curing and hot water and dry air (105 ℃) combined curing decreased by 36.73% and 14.56%, respectively, and spalled at the temperature of 348 ℃ and 370 ℃, respectively. The residual compressive strength of UHPC subjected to sprinkling-dry air (200 ℃ ) curing regime increased at first and then decreased during the increase of temperature, and the critical temperature was 300 ℃, at which showed the best explosive spalling resistance performance. Residual axial tensile strength of specimen subjected to hot water and dry air (105 ℃) curing also increased firstly and then decreased with the increasing temperature, the axial tensile strength cured under hot water and dry air (105 ℃) curing was only 54.05% of that under hot water curing. The dumbbell-shaped specimens could not avoid the occurrence of explosive spalling when the temperature was over 400 ℃.
- ultra-high performance concrete,
- curing regime,
- residual compressive strength,
- residual axial tensile strength,
- explosive spalling

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References(42)

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