Study on concrete at high temperature in China—an overview

Xiao, Jianzhuang; König, Gert

doi:10.1016/s0379-7112(03)00093-6

Cited by 236 publications

(131 citation statements)

References 2 publications

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“…the reduction in compressive strength of concrete [6,9,11,17,[19][20][21]. The retained compressive strength values of the concrete specimens after exposure to high temperatures are presented in Figure 3.…”

Section: Compressive Strength Test Resultsmentioning

confidence: 99%

“…Moreover, the spalling may substantially reduce the load-bearing capacity of a fire-damaged [15,16]. Furthermore, the concrete can be broken into pieces often without advance notice due to thermal explosions [9].…”

Section: Visual Inspectionsmentioning

confidence: 99%

“…The mechanical properties such as strength, modulus of elasticity, and volume stability of concrete are considerably reduced during these exposures. This may result in undesirable structural failures [4][5][6][7][8][9][10][11]. Therefore, retained properties of concrete after a fire are …”

Section: Introductionmentioning

confidence: 99%

“…The integrity and load-bearing capacity of the structure may be imperilled. Furthermore, the explosive thermal spalling of concrete during fire occurs mostly without advance notice [9,10,18,24]. It should also be noted that the presence of loading during heating influences the strength of concrete since the failure mode is generally thermal spalling when concrete is exposed to high temperature [25].…”

mentioning

confidence: 99%

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Retained properties of concrete exposed to high temperatures: Size effect

Arıöz

2009

Fire and Materials

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SUMMARYConcrete as a construction material is likely exposed to high temperatures during fire. The retained properties of concrete after such exposures are still of great importance in terms of the serviceability of structures. This paper presents the effects of high temperatures on the physical, mechanical, and microstructural properties of concrete. Specimens with different sizes were exposed to high temperatures ranging from 200 to 1200 • C. The compressive strength, splitting tensile strength, ultrasonic pulse velocity, and rebound numbers of the specimens were determined. The microstructures of the specimens were examined by scanning electron microscope (SEM) analyses. The test results indicated that the retained compressive strength of concrete considerably decreased with increase in temperature. The effect of specimen size on the retained compressive strength was not pronounced. The retained splitting tensile strength of concrete remarkably reduced as the temperature was increased. The specimen size played an important role on the retained splitting tensile strength of concrete up to 400 • C. The test results revealed that ultrasonic pulse velocity (UPV) test can be successfully used in order to check the uniformity of fire-damaged structures. The rebound numbers decreased with increase in exposure temperature. SEM studies on specimens exposed to 800 • C revealed significant changes in the microstructure of the concrete.

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Section: Compressive Strength Test Resultsmentioning

confidence: 99%

Section: Visual Inspectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Retained properties of concrete exposed to high temperatures: Size effect

Arıöz

2009

Fire and Materials

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“…The first three types of spalling occur during first 20-30 minutes of fire exposure. The corner spalling arises after 30-60 minutes of fire [7].…”

Section: Introductionmentioning

confidence: 99%

High Temperature Exposure of HPC – Experimental Analysis of Residual Properties and Thermal Response

et al. 2016

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Abstract. The effect of high temperature exposure on properties of a newly designed High Performance Concrete (HPC) is studied in the paper. The HPC samples are exposed to the temperatures of 200, 400, 600, 800, and 1000°C respectively. Among the basic physical properties, bulk density, matrix density and total open porosity are measured. The mechanical resistivity against disruptive temperature action is characterised by compressive strength, flexural strength and dynamic modulus of elasticity. To study the chemical and physical processes in HPC during its hightemperature exposure, Simultaneous Thermal Analysis (STA) is performed. Linear thermal expansion coefficient is determined as function of temperature using thermodilatometry (TDA). In order to describe the changes in microstructure of HPC induced by high temperature loading, MIP measurement of pore size distribution is done. Increase of the total open porosity and connected decrease of the mechanical parameters for temperatures higher than 200 °C were identified.

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Temperature dependence of thermal induced mesocracks around limestone aggregate in normal concrete

Xuan

Shui

2009

Fire and Materials

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SUMMARYThis paper presents the results of thermal expansion measurements of mortar and limestone aggregate and thermal induced mesocracks around limestone aggregate in normal concrete exposed to high temperature, up to 800 • C. The former was measured by a fused silica Workhorse Dilatometer. The later was observed by the viewfinder of Polarizing Optical Microscope. The results showed that the difference in coefficient of thermal expansion between mortar and limestone exhibited the temperature dependence. Thermal induced tensile stress around limestone aggregate first took place, following the hydrostatic compression under higher temperature. During the whole heating process, the tangential, radical and linkage mesocracks in concrete gradually initiated and propagated for the response of thermal induced stress around limestone aggregate.

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Study on concrete at high temperature in China—an overview

Cited by 236 publications

References 2 publications

Retained properties of concrete exposed to high temperatures: Size effect

Retained properties of concrete exposed to high temperatures: Size effect

High Temperature Exposure of HPC – Experimental Analysis of Residual Properties and Thermal Response

Temperature dependence of thermal induced mesocracks around limestone aggregate in normal concrete

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