scholarly journals Effect of Mass Loss of Organic Fiber on the Water Vapor Pressure and Moisture Migration of 150 and 200 MPa Ultra-High Strength Concrete Exposed to High Temperature

2020 ◽  
Vol 18 (6) ◽  
pp. 339-351
Author(s):  
Gyeongcheol Choe ◽  
Gyuyong Kim ◽  
Jeongsoo Nam ◽  
Hongseop Kim ◽  
Euichul Hwang ◽  
...  
Keyword(s):  
Water Vapor ◽  
High Temperature ◽  
Vapor Pressure ◽  
Mass Loss ◽  
High Strength Concrete ◽  
Water Vapor Pressure ◽  
High Strength ◽  
Moisture Migration ◽  
Organic Fiber ◽  
Strength Concrete

Water Vapor Pressure and Spalling Properties of High Strength Concrete Restrained by Steel-Ring

2018 ◽  
Vol 30 (6) ◽  
pp. 617-624
Author(s):  
Jae-Wook Baek ◽  
Gyu-Yong Kim ◽  
Jeong-Soo Nam ◽  
Eui-Chul Hwang ◽  
Gyeong-Cheol Choe ◽  
...  
Keyword(s):  
Water Vapor ◽  
Vapor Pressure ◽  
High Strength Concrete ◽  
Water Vapor Pressure ◽  
High Strength ◽  
Strength Concrete

Comparison Analysis on the Mechanical Properties of HSC and NSC after the Action of High Temperatures

2014 ◽  
Vol 1014 ◽  
pp. 49-52
Author(s):  
Xiao Ping Su
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Temperatures ◽  
High Strength Concrete ◽  
Elasticity Modulus ◽  
Strain Curve ◽  
Peak Stress ◽  
High Strength ◽  
Peak Strain ◽  
Strength Concrete

With the wide application of high strength concrete in the building construction,the risk making concrete subject to high temperatures during a fire is increasing. Comparison tests on the mechanical properties of high strength concrete (HSC) and normal strength concrete (NSC) after the action of high temperature were made in this article, which were compared from the following aspects: the peak stress, the peak strain, elasticity modulus, and stress-strain curve after high temperature. Results show that the laws of the mechanical properties of HSC and NSC changing with the temperature are the same. With the increase of heating temperature, the peak stress and elasticity modulus decreases, while the peak strain grows rapidly. HSC shows greater brittleness and worse fire-resistant performance than NSC, and destroys suddenly. The research and evaluation on the fire-resistant performance of HSC should be strengthened during the structural design and construction on the HSC buildings.

scholarly journals Compressive Properties of Ultra High Strength Concrete Exposed to High Temperature

2014 ◽  
Vol 26 (3) ◽  
pp. 377-384 ◽  
Author(s):  
Yong-Hak Kang ◽  
Choong-Hyun Kang ◽  
Hyun-Guk Choi ◽  
Hyun-Jun Shin ◽  
Wha-Jung Kim
Keyword(s):  
High Temperature ◽  
High Strength Concrete ◽  
High Strength ◽  
Compressive Properties ◽  
Strength Concrete

Performance Deterioration of High Strength Concrete under Mixed Erosion and Freeze-Thaw Cycling

2010 ◽  
Vol 163-167 ◽  
pp. 1655-1660
Author(s):  
Jian Zhang ◽  
Bo Diao ◽  
Xiao Ning Zheng ◽  
Yan Dong Li
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Mass Loss ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
High Strength Concrete ◽  
High Strength ◽  
Freeze Thaw ◽  
Strength Concrete ◽  
Dynamic Modulus Of Elasticity

The mechanical properties of high strength concrete(HSC) were experimentally investigated under mixed erosion and freeze-thaw cycling according to ASTM C666(Procedure B), the erosion solution was mixed by weight of 3% sodium chloride and 5% sodium sulfate. The mass loss, relative dynamic modulus of elasticity, compressive strength, elastic modulus and other relative data were measured. The results showed that with the increasing number of freeze-thaw cycles, the surface scaled more seriously; the mass loss, compressive strength and elastic modulus continued to decrease; the relative dynamic modulus of elasticity increased slightly in the first 225 freeze-thaw cycles, then decreased in the following 75 cycles; the corresponding strain to peak stress decreased with the increase of freeze-thaw cycles. After 200 cycles, the rate of deterioration of concrete accelerated obviously.

Effect of amorphous metallic fiber on mechanical properties of high-strength concrete exposed to high-temperature

2019 ◽  
Vol 218 ◽  
pp. 448-456 ◽  
Author(s):  
Gyeongcheol Choe ◽  
Gyuyong Kim ◽  
Hongseop Kim ◽  
Euichul Hwang ◽  
Sangkyu Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
Metallic Fiber

Effects of Silica Fume Addition on the Spalling Phenomena of Reactive Powder Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 1090-1095 ◽  
Author(s):  
Kai Pei Tian ◽  
Yang Ju ◽  
Hong Bin Liu ◽  
Jin Hui Liu ◽  
Li Wang ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Vapor Pressure ◽  
Silica Fume ◽  
High Strength Concrete ◽  
High Strength ◽  
Reactive Powder Concrete ◽  
Spalling Resistance ◽  
Explosive Spalling ◽  
Strength Concrete ◽  
Reactive Powder

The explosive spalling of high-strength concrete due to fire is a problem that has garnered increasingly widespread attention, particularly the explosive spalling of reactive powder concrete (RPC). For years, based on the vapor pressure mechanism, the addition of fibers has been demonstrated to be somewhat effective in protecting against spalling. However, relevant experiments indicate that fibers are not effective for dense concrete, which is a challenge for the simple vapor pressure mechanism in providing spalling resistance for RPC. The authors found that silica fume plays an important role in the explosive spalling of RPC. Thus, four classes of RPCs with different ratios of silica fume were prepared, and the spalling phenomena and the inner temperature distribution during heating were investigated. The results show that silica fume content has a prominent effect on the spalling process of RPC.

Influences of Glassified Micro-Bubble on Mechanical Properties of Ultra-High-Strength Concrete after Exposure to High Temperature

2014 ◽  
Vol 629-630 ◽  
pp. 259-264
Author(s):  
Gai Fei Peng ◽  
Xiao Li Wang ◽  
Lin Wang
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
High Temperature ◽  
High Strength Concrete ◽  
Room Temperature ◽  
High Strength ◽  
Strength Concrete ◽  
Micro Bubble ◽  
Residual Mechanical Properties ◽  
Tensile Splitting Strength

An experimental investigation was conducted to study residual mechanical properties of Ultra-High-Strength concrete with different dosages of glassified micro-bubble after exposure to high temperature. After exposure to different target temperatures (room temperature, 200 °C, 400 °C, 600 °C,800 °C), residual mechanical properties (residual compressive strength, residual tensile splitting strength, residual fracture energy) of Ultra-High-Strength concrete under different conditions including 1 water-binder ratios (0.18), 3 different contents of glassified micro-bubble (0%, 40%, 60%) were all investigated. The effect of different dosage of glassified micro-bubble was studied on residual mechanical properties of Ultra-High-Strength concrete after exposure to high temperature. The results indicate that the variations of different kinds of Ultra-High-Strength concrete with different dosage of glassified micro-bubble are basically the same. With the increase of temperature, the residual mechanical properties increase at first, then decrease. The residual mechanical properties decrease after exposure to high temperature of 800 °C.

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