The role of calcium aluminate cement in developing an efficient ultra-high performance concrete resistant to explosive spalling under high temperatures

Khan, Mehran; Lao, Jian-Cong; Ahmad, Muhammad Riaz; Kai, M.F.; Dai, Jian‐Guo

doi:10.1016/j.conbuildmat.2023.131469

Cited by 47 publications

(8 citation statements)

References 49 publications

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“…Consequently, water vaporization leads to critical cracks within the cement paste due to the pressure exerted. An elevated temperature intensifies water vaporization, thereby increasing water vapor pressure and widening cracks within the sample's internal structure, spreading throughout the matrix [80][81][82][83][84]. SEM analysis captured images of R0, R1, R4, and R7 samples under ambient conditions and subsequent exposure to high temperatures, depicted in Figure 13.…”

Section: Sem Analysismentioning

confidence: 99%

Evaluating Sustainable Colored Mortars Reinforced with Fly Ash: A Comprehensive Study on Physical and Mechanical Properties under High-Temperature Exposure

Akbulut,

Guler,

Osmanoğlu

et al. 2024

Buildings

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This research primarily delves into a comprehensive investigation concerning the synergistic effects of fly ash (FA) with yellow pigment (YP) and red pigment (RP) in the workability, physical characteristics, and mechanical properties of colored mortars, both pre-and post-exposure to high temperatures. Within the experimental design, FA was employed as a 20% substitute for cement, while YP and RP were systematically incorporated into the cement mixtures at varying concentrations (1%, 3%, and 5% by weight). The specimens underwent controlled exposure to high temperatures, ranging from 300 °C to 800 °C. This study’s outcomes unveiled that while the introduction of FA positively influenced mortar workability, including YP and RP adversely impacted spreading diameters (SD), resulting in a discernible reduction in overall workability. Despite these effects, FA emerged as a pivotal factor to enhancing the residual compressive strength (RCS) and residual flexural strength (RFS) of the colored mortars. For instance, after 90 days at 800 °C, the control concrete (R0) exhibited a notable 66.13% decrease in RCS, and the sample solely incorporating FA (R1) demonstrated a reduced reduction of 55.39%. Similarly, mortars with YP additives (R2–R4) and RP additives (R5–R7) showcased RCS reductions within the range of 53.32% to 55.12% and 54.51% to 56.04%, respectively.

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Section: Sem Analysismentioning

confidence: 99%

Evaluating Sustainable Colored Mortars Reinforced with Fly Ash: A Comprehensive Study on Physical and Mechanical Properties under High-Temperature Exposure

Akbulut,

Guler,

Osmanoğlu

et al. 2024

Buildings

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“…Single-cell box girders have become widely utilized in the construction of medium- and long-span highway bridges [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ] due to their aesthetical appearance and exceptional resistance to bending and torsional forces [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. The introduction of ultra-high performance concrete (UHPC), an advanced cementitious composite characterized by its low permeability and ultra-high strength [ 18 ], holds promising prospects for the transition of box girder towards thin-walled structures with larger spans and wider rib spacings [ 19 , 20 , 21 , 22 , 23 , 24 ]. Li et al [ 25 ] showcased the UHPC girder bridge for the Fourth Beijiang River Bridge in Yingde City (in China), which featured a larger span (102 m) and reduced cross-section dimensions (15–20 cm).…”

Section: Introductionmentioning

confidence: 99%

Distortion Effect on the UHPC Box Girder with Vertical Webs: Theoretical Analysis and Case Study

Wang,

Wu,

Zhang

et al. 2024

Materials

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Distortion deformation usually imposes a potential threat to bridge safety. In order to comprehensively understand the distortion effect on thin-walled ultra-high performance concrete (UHPC) box girders, an innovative approach encompassing the governing distortion differential equation is introduced in this study based on the general definition of distortion angle within the cross-section plane. The analytical results obtained from the proposed method are in accordance with those obtained from the energy method, and exhibit favorable agreement with experimental findings documented in the existing literature. Furthermore, a finite element model is developed on the ANSYS 2021 R1 software platform with the employment of a Shell 63 element. Numerical outcomes are also in good agreement with the experimental data, affirming the validity and reliability of the findings. In addition, parameter analysis results indicate that the distortion angle remains approximately constant at a location approximately 1/10 of the span from the mid-span cross-section of the box girder, regardless of changes in the span-to-depth ratio. Increasing the web thickness yields a notable reduction in the distortion effects, and decreasing the wall thickness can effectively mitigate the distortion-induced transverse bending moment. Compared with normal-strength concrete box girders, UHPC box girders can reduce the distortion angle within the span range, which is beneficial for maintaining the overall stability of the box girders. The outcomes obtained from this study yield engineers an enhanced understanding of distortion effect on the UHPC girder performance.

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“…After over 40 years of development, refractory castables with calcium aluminate cement (CAC) define an innovative solution in heat-resistant materials. Remarkable compressive strength (exceeding 150 MPa), even in extreme temperatures above 1000 °C, determines the research innovation in developing ultra-high-performance concrete (UHPC) materials with CAC binders [ 1 , 2 , 3 , 4 ]. CAC-based castables have revolutionized the metallurgical and petrochemical industries, inspiring new materials science advancements [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…This effect results from the binder’s dehydration and cement minerals’ recrystallization. Consequently, the initial strength may decrease more than twice [ 1 , 2 , 3 , 4 ]. Still, these castables remain suitable for specific industrial applications where resistance to high temperatures is required, and mechanical properties are not critical [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

“…In other words, the discussed refractory components typically do not require additional structural reinforcement [ 1 , 2 , 3 , 4 ]. Unlike the existing engineering solutions, this study is dedicated to advancing building protection against fire and explosions by developing ultra-high-performance structures employing refractory castables.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the High-Temperature Bonding Performance of Refractory Castables with Ribbed Stainless-Steel Bars

Plioplys,

Antonovič,

Boris

et al. 2024

Materials

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Refractory materials containing calcium aluminate cement (CAC) are commonly used in the metallurgical and petrochemical industries due to their exceptional mechanical resistance, even at temperatures exceeding 1000 °C, and do not require additional reinforcement. This study seeks to advance this practice by developing ultra-high-performance structures that offer building protection against fire and explosions. Such structures require bar reinforcement to withstand accidental tension stresses, and the bond performance becomes crucial. However, the compressive strength of these materials may not correlate with their bond resistance under high-temperature conditions. This study investigates the bond behavior of ribbed stainless austenitic steel bars in refractory materials typical for structural projects. The analysis considers three chamotte-based compositions, i.e., a conventional castable (CC) with 25 wt% CAC, a medium-cement castable (MCC) with 12 wt% CAC, a low-cement castable (LCC), and a low-cement bauxite-based castable (LCB); the LCC and LCB castables contain 7 wt% CAC. The first three refractory compositions were designed to achieve a cold compressive strength (CCS) of 100 MPa, while the LCB mix proportions were set to reach a CCS of 150 MPa. Mechanical and pull-out tests were conducted after treatment at 400 °C, 600 °C, 800 °C, and 1000 °C; reference specimens were not subjected to additional temperature treatment. This study used X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM) methods to capture the material alterations. The test results indicated that the bonding resistance, expressed in terms of the pull-out deformation energy, did not directly correlate with the compressive strength, supporting the research hypothesis.

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The role of calcium aluminate cement in developing an efficient ultra-high performance concrete resistant to explosive spalling under high temperatures

Cited by 47 publications

References 49 publications

Evaluating Sustainable Colored Mortars Reinforced with Fly Ash: A Comprehensive Study on Physical and Mechanical Properties under High-Temperature Exposure

Evaluating Sustainable Colored Mortars Reinforced with Fly Ash: A Comprehensive Study on Physical and Mechanical Properties under High-Temperature Exposure

Distortion Effect on the UHPC Box Girder with Vertical Webs: Theoretical Analysis and Case Study

Investigating the High-Temperature Bonding Performance of Refractory Castables with Ribbed Stainless-Steel Bars

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