Combined curing as a novel approach to improve resistance of ultra-high performance concrete to explosive spalling under high temperature and its mechanical properties

Peng, Gai Fei; Niu, Xu-Jing; Shang, Ya-Jie; Zhang, Deng-Ping; Chen, Xi-Wang; Ding, Hui

doi:10.1016/j.cemconres.2018.04.011

Cited by 103 publications

(26 citation statements)

References 34 publications

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“…Supplementary cementitious materials (SCMs) contribute to improve the performance of concrete at high temperatures owing to their pozzolanic effects and super micro-filling capacity [14]. Furthermore, the residual unhydrated cementitious materials particles, such as: cement, activated slag [7], FA [14] and MK [7,15] can further react with water, which mainly comes from the vaporization of moisture [2] and dehydration of calcium hydroxide (CH), leading to the formation of dense hydration products [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures

Tang

Zhang

et al. 2020

Materials

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Concrete has low porosity and compact microstructure, and thus can be vulnerable to high temperature, and the increasing application of various types of supplementary cementitious materials (SCMs) in concrete makes its high-temperature resistant behavior more complex. In this study, we investigate the effects of four formulations with typical SCMs combinations of fly ash (FA), ultra-fine fly ash (UFFA) and metakaolin (MK), and study the effects of SCMs combinations on the thermal performance, microstructure, and the crystalline and amorphous phases evolution of concrete subjected to high temperatures. The experimental results showed that at 400 °C, with the addition of 20% FA (wt %), the thermal conductivity of the sample slightly increased to 1.5 W/(m·K). Replacing FA with UFFA can further increase the thermal conductivity to 1.7 W/(m·K). Thermal conductivity of concrete slightly increased at 400 °C and significantly reduced at 800 °C. Further, combined usage of SCMs delayed and reduced micro-cracks of concrete subjected to high temperatures. This study demonstrates the potential of combining the usage of SCMs to promote the high-temperature performance of concrete and explains the micro-mechanism of concrete containing SCMs at high temperatures.

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Section: Introductionmentioning

confidence: 99%

Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures

Tang

Zhang

et al. 2020

Materials

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“…Compressive strength of RFCT columns in this experimental study was compared with the design strength as proposed by Eurocode 4(2012) [39]. e EC4 equations for compressive strength of concrete-lled steel tube are as follows, in which equation (7) neglects the con ning e ect, while equation (8) considers the con ning e ect with the relative slenderness λ ≤ 0.5:…”

Section: Axial Compressive Strength Of Rfct Columnsmentioning

confidence: 99%

“…e comparisons between axial compressive strength calculated by equations (7) and (8) and the 167 test results [17][18][19][40][41][42][43][44][45] as well as 13 test results in Table 1 are shown in Figures 11(a) and 11(b), respectively. e average of N ue /N u1 is 1.19 and standard deviation is 0.116, while the average of N ue / N u2 is 1.07 and standard deviation is 0.090.…”

Section: Axial Compressive Strength Of Rfct Columnsmentioning

confidence: 99%

“…e average of N ue /N u1 is 1.19 and standard deviation is 0.116, while the average of N ue / N u2 is 1.07 and standard deviation is 0.090. Results show that equation (7) can provide conservative calculation by 20% because the con nement e ect is not considered. While equation (8) considering the con nement e ect shows better agreement with test results, it is recommended that equation (8) can be applied to predict the compressive strength of RFCT columns.…”

Section: Axial Compressive Strength Of Rfct Columnsmentioning

confidence: 99%

“…However, the main disadvantages of RPC are mainly the lower ratio of ultimate strain to peak strain, which make it more brittle than normal strength concrete (NSC) or high-strength concrete (HSC). Further, due to more compactness, it is more susceptible to fire-induced spalling [7][8][9][10]. Recently, an experimental research on fire resistance was performed on seven reinforced RPC columns by our research group.…”

Section: Introductionmentioning

confidence: 99%

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Response of RPC‐Filled Circular Steel Tube Columns under Monotonic and Cyclic Axial Loading

Rong

Zeng

Guo

et al. 2019

Shock and Vibration

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Results from mechanical tests on thirteen reactive powder concrete- (RPC-) filled circular steel tube (RFCT) columns under monotonic and cyclic axial loading are presented in this paper. The test variables include monotonic and cyclic loadings, confinement coefficient, and diameter of the steel tube. The test results show that the envelope curves of specimens under cyclic loading were similar to the load-deformation curves of the specimens under monotonic loading. Confinement coefficient had a significant influence on the failure modes of RFCT columns. With an increase in confinement coefficient of 0.53 to 0.98, the failure mode transformed from shear failure to compressive failure for specimens under monotonic and cyclic loading. In the elastic stage, no confining effect was provided by the steel tube to the RPC since Poisson’s ratio of steel was larger than the transverse deformation coefficient of RPC. Beyond the elastic stage, the axial compressive strength and ultimate strain of RPC increased significantly due to the confining effect when compared to unconfined RPC. Stress of the steel tube and RPC was investigated by using an elastic-plastic analytical model. Before yielding of the steel tube, stress development in the tube was faster in the longitudinal direction than in the hoop direction. The results of the experiment indicate that the compressive strength of RPC could be predicted by Mander’s model for confined concrete. Based on Mander’s model, an equation is extended to calculate the axial compressive strength of RFCT columns, and the predicted results are in good agreement with the test results. Based on comparative analysis of 180 RFCT columns axial compressive tests, the equation given by EC4 considering the confinement effect can be applied to predict the compressive strength of RFCT columns.

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Construction of improved isothermal TTT cure diagram based on an epoxy–amine thermoset

Zhang

Wang

Liu

2018

J of Applied Polymer Sci

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Cure degree plays a pivotal role in determining the final properties of thermosetting resin, while the parameter cannot be visually presented by the classic isothermal time–temperature‐transformation (TTT) diagram. An improved isothermal TTT cure diagram is built for an epoxy–amine thermoset with the visual relationship between temperature, time, and cure degree during the whole curing. As for the improved isothermal TTT cure diagram, the curing surface and the gelation plane were developed using Vyazovkin method and rheological analysis in turn, and the variation between glass transition temperature (T g) and curing degree was described by Dibenedetto's equation. The obtained improved isothermal TTT diagram of epoxy–amine thermoset was constructed by the combination of calorimetric and rheological analysis. The fitting results of vitrification surface and gelation plane obtained via improved isothermal TTT diagram were in good agreement with experimental results. In addition, the experimental gelation curve of epoxy–amine thermoset is directly linked to the steepest location of curing surface. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47279.

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Combined curing as a novel approach to improve resistance of ultra-high performance concrete to explosive spalling under high temperature and its mechanical properties

Cited by 103 publications

References 34 publications

Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures

Effects of Combined Usage of Supplementary Cementitious Materials on the Thermal Properties and Microstructure of High-Performance Concrete at High Temperatures

Response of RPC‐Filled Circular Steel Tube Columns under Monotonic and Cyclic Axial Loading

Construction of improved isothermal TTT cure diagram based on an epoxy–amine thermoset

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