Experimental study on the properties of Q960 ultra–high–strength steel after fire exposure

Xue, Xuanyi; Shi, Yu; Zhou, Xuhong; Wang, Jie; Xu, Yunpeng

doi:10.1016/j.istruc.2022.12.034

Cited by 48 publications

(4 citation statements)

References 53 publications

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“…When the W/C exceeded 1.25, the slurry was too thin to form a slurry shell on the surface of the coral aggregates, which resulted in an unsatisfactory filling and wrapping effect on aggregate pores and a significant increase in water absorption. Numerical fitting can show the evolution law of data and is often performed for data analysis [ 52 , 53 ]. Equation (3) was proposed to quantify the relationship between the W/C and the water absorption of modified coral aggregates via numerical fitting, where ρ represents the water absorption rate of the modified coral aggregates and ω represents the W/C of the slurry.…”

Section: Resultsmentioning

confidence: 99%

Effect of Superfine Cement Modification on Properties of Coral Aggregate Concrete

et al. 2023

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In marine engineering, using corals as aggregates to prepare concrete can reduce both the exploitation of stones and the transportation cost of building materials. However, coral aggregates have low strength and high porosity, which may affect the workability and mechanical properties of concrete. Hence, superfine cement is used innovatively in this study to modify coral aggregates; additionally, the effects of the water–cement ratio and curing time on the water absorption and strength of modified coral aggregates are investigated. Modified coral aggregate concrete is prepared, and the effect of using modified superfine cement on its workability and strength is investigated. Experimental results show that when the water-cement ratio exceeds 1.25, the slurry does not form a shell on the surface of the coral aggregates and the water absorption of the coral aggregates increases significantly. The strength of the modified coral aggregates cured for a short duration is slightly lower than that of unmodified coral aggregates, whereas that cured for 28 days is approximately 20% higher than that of unmodified coral aggregates. Using superfine cement to modify coral aggregate concrete can improve its workability, but not its compressive properties.

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Section: Resultsmentioning

confidence: 99%

Effect of Superfine Cement Modification on Properties of Coral Aggregate Concrete

et al. 2023

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“…Then, the true stress and true strain at the yield and ultimate points are used to calculate three Swift parameters A, ε 0 , and n based on the three conditions presented in Eqs. ( 7)- (9). Eqs.…”

Section: True Stress-strain Relationshipmentioning

confidence: 99%

“…Otherwise, a significant strength degradation might occur in HAZ, which is more severe for steels with a higher strength grade [2,6,7]. Besides, the strength degradation is significant for structural steels after fire [8,9], even though the maximum temperature (up to 1000 • C) might not be as high as that experienced during welding. The reason is that the cooling rate is very low compared to that in a welding process.…”

Section: Introductionmentioning

confidence: 99%

A macro prediction model for butt-welded (U)HSS connections with softened HAZ

Yan

Xie

Yang

et al. 2023

Journal of Constructional Steel Research

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“…a great deal of research has been conducted by domestic and foreign scholars on the microstructural distribution of engineering steels [8]. in terms of the relationships between high-temperature service environments and material microstructure [9][10][11][12][13][14][15], Zeng et al studied the variation of microstructure in post-fire 4 mm-thick Q890 steel and found that the fire temperature affects the phase size and the constituent phases in the investigated material [13]. Wang et al investigated the influence of TMcp process on the microstructure and properties of 20 mm-thick Q460q steel, and found that both the volume fraction and grain size of ferrite are inversely proportional to the rolling temperature [14].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Short-Term High Temperature Environment on the Non-Uniform Distribution of Ferrite Grain Size in 40 mm-thick Q345 Steel

Xu,

Gou,

et al. 2024

Archives of Metallurgy and Materials

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In order to reveal the non-uniform distribution of grain size in thick direction for engineering heavy plate, microstructure of 40 mm-thick Q345 steel was observed and measured under different short-term high temperature environments formed by fire. Moreover, the influence of the short-term high temperature environment was revealed on the distribution of ferrite grain size in the Q345 steel. Under different fire service environments, there was a log-normal distribution relationship between the distribution parameter Nf (number of ferrite grains) and df (average grain diameter), as well as ρAf (area fraction density) and df, at different positions along the thickness direction. However, the statistical results are greatly affected by the length of the statistical interval. When df is about 4 to 6 times the length of the statistical interval, the statistical accuracy is higher. By using nonlinear fitting method, multiple non-uniform distribution empirical models including Nf-df empirical formulas and ρAf-df empirical formulas were established at different positions along thick direction under various fire environments. Furthermore, the interrelationships between fire temperature T and Nf , T and ρAf , fire duration t and Nf , t and ρAf were revealed, respectively.

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Experimental study on the properties of Q960 ultra–high–strength steel after fire exposure

Cited by 48 publications

References 53 publications

Effect of Superfine Cement Modification on Properties of Coral Aggregate Concrete

Effect of Superfine Cement Modification on Properties of Coral Aggregate Concrete

A macro prediction model for butt-welded (U)HSS connections with softened HAZ

The Influence of Short-Term High Temperature Environment on the Non-Uniform Distribution of Ferrite Grain Size in 40 mm-thick Q345 Steel

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