High Strength Concrete Tests under Elevated Temperature

Wu, Zhuoya; Lo, S.H.; Tan, Kang Hai; Su, Kai

doi:10.30958/ajte.6-3-1

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…As a result, the greatest observed core and gas temperatures were 713 and 1213 ℃, respectively, indicating that most specimens had been heated to more than 700 ℃ (Fig. 13) [231]. Postcooling spalling can therefore be regarded as reasonable [85].…”

Section: Post-cooling Spallingmentioning

confidence: 97%

Fire spalling behavior of high-strength concrete: A critical review

Amran

Huang

Onaizi

et al. 2022

Construction and Building Materials

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Section: Post-cooling Spallingmentioning

confidence: 97%

Fire spalling behavior of high-strength concrete: A critical review

Amran

Huang

Onaizi

et al. 2022

Construction and Building Materials

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“…Three types could account for the spalling phenomenon of concrete, mainly, the thermal-mechanical spalling, thermal-hydro spalling, and thermal-chemical spalling [20,24,28,29,31,32]. Most researchers consider that thermal-hydro spalling, appearing at the early heating stage, is the most critical among the others [36]. Many researchers believe that due to the low permeability of concrete, resulted from the low porosity, the extremely high water vapor pressure, generated during fire exposure and restrained inside the concrete body could generate the thermal-hydro spalling phenomenon when the pore pressure gradually grows-up, attains the saturation vapor pressure and exceeds the concrete tensile strength [13,14,17,22,[29][30][31][32]36].…”

Section: Cracking and Spalling Of Test Specimens During Thermal Exposure Stagementioning

confidence: 99%

“…Most researchers consider that thermal-hydro spalling, appearing at the early heating stage, is the most critical among the others [36]. Many researchers believe that due to the low permeability of concrete, resulted from the low porosity, the extremely high water vapor pressure, generated during fire exposure and restrained inside the concrete body could generate the thermal-hydro spalling phenomenon when the pore pressure gradually grows-up, attains the saturation vapor pressure and exceeds the concrete tensile strength [13,14,17,22,[29][30][31][32]36]. It should be mention that at 300 °C, the vapor pressure could approximately reach the saturated case of 8 MPa [24,29].…”

Section: Cracking and Spalling Of Test Specimens During Thermal Exposure Stagementioning

confidence: 99%

Post-fire serviceability and residual strength of composite post-tensioned concrete T-beams

2021

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In this study, the response of ten composite post-tensioned concrete beams topped by a reinforced concrete deck with adequate reinforcing shear connectors is investigated. Depending on the concrete compressive strength of the deck slab (20, 30, and 40 MPa), beams are grouped into three categories. Seven of these beams are exposed to a fire attack of 700 and 800 °C temperature simultaneously with or without the presence of a uniformly distributed sustained static loading. After cooling back to ambient temperature, these composite beams are loaded up to failure, using a force control module, by monotonic static loading in a four-point-bending setup with two symmetrical concentrated loads applied in the middle third of the effective span. The objectives of this study include investigating the behavior of the composite prestressed concrete beams under and after the exposure to a direct fire flame, as well as finding their residual load-carrying capacity. Tests demonstrate significant deteriorations caused by exposure to high temperatures associated with the increase of the member’s camber. The increase of the midspan camber after heating exposure reached approximately 200%. On the other hand, the 1-h steady-state exposure of test specimens to temperatures of 700 and 800 °C led to reduce the load-carrying capacity of the heat-deteriorated beams up to 45% and 54%, respectively.

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“…SCMs are fine-grained mineral additives with pozzolanic properties. The most widely used among these materials are silica fume and fly ash [59]. These materials are economical as they are locally sourced.…”

Section: Introductionmentioning

confidence: 99%

Artificial neural network evaluation of concrete performance exposed to elevated temperature with destructive–non-destructive tests

Demir,

Duranay,

Demirel

et al. 2024

Neural Comput & Applic

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In this study, it is aimed to predict the performance of concretes obtained by using supplementary cementitious materials (SCM) before and after high temperature using artificial neural network. Thus, in addition to contributing to sustainable development and circular economy by using waste materials in concrete production, predicting concrete strength using artificial neural network without the need for experimental studies will provide a great advantage in practice. In addition, it will also contribute to the literature in terms of determining the optimum amount of metakaolin to be used with fly ash in concrete production. Metakaolin, silica fume and fly ash were used as SCM in different proportions in concrete mixes. Accordingly, a total of 22 concrete series were prepared, one of which was the control series. Porosity, ultrasonic pulse velocity, pressure and tensile strength tests were applied to the series at the end of 7th, 28th and 90th curing periods before high temperature. In order to determine the strength losses after elevated temperature, porosity and compressive strength tests were applied at temperatures of 400, 600 and 800 °C. Mineral additive series showed positive mechanical properties up to 20%. However, it has been observed that the use of fly ash after a certain rate causes a decrease in strength. After elevated temperature, strength loss was observed in all series due to the increase in temperature, while it was observed that the rate of being affected by elevated temperature decreased as the percentage of metakaolin increased. Optimum mineral additive usage percentages were determined as 10% fly ash and 15% metakaolin. On the other hand, the use of mineral additives above the optimum level caused the performance of the concrete to decrease. Then, the concrete compression strengths obtained at 7th, 28th, and 90th days and at 400, 600 and 800 °C temperatures are taken as the outputs of the ANN. The artificial neural network provided the closest results to experimental data. Moreover, to prove the predictive performance of ANN, a comparative analysis was made with GPR, SVM and LR and the smallest value of the RMSE value is obtained with the ANN model. Finally, a fivefold cross-validation criteria was used to objectively present the performance of the model.

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High Strength Concrete Tests under Elevated Temperature

Cited by 7 publications

References 38 publications

Fire spalling behavior of high-strength concrete: A critical review

Fire spalling behavior of high-strength concrete: A critical review

Post-fire serviceability and residual strength of composite post-tensioned concrete T-beams

Artificial neural network evaluation of concrete performance exposed to elevated temperature with destructive–non-destructive tests

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