EXPERIMENTAL STUDY ON FIRE RESISTANCE OF 200-300 MPA HIGH STRENGTH CONCRETE WITH SYNTHETIC FIBER AND STEEL FIBER

High strength concrete encased columns are being developed for erecting high-rise buildings as their higher load bearing capacity and smaller cross section size than normal concrete encased column. At ambient temperature, high strength concrete is always mixed with steel fibers to improve its ductility to match the material properties of high strength steel while constructing concrete encased columns. However, for high strength concrete at elevated temperature, spalling usually can be observed due to different thermal properties of various materials mixed such as siliceous aggregate, cement, silica fume, grit and moisture. Most of previous studies present that pore vapor compression induces high strength concrete spalling and propylene fiber can prevent it from spalling. The aim of the present experimental study is to discover the minimum propylene fiber ratio to prevent spalling of 115~120MPa concrete with aggregate and steel fiber. The experimental study carried out on 17 specimens with different water-binder ratio, steel fiber ratio and monofilament propylene fiber ratio exposed to ISO834 fire. The test results that 0.15% by volume of propylene fibers can prevent 115/120MPa high strength concrete with aggregate from spalling. It is worth noting that propylene fiber mixture ratio of 0.15% is lower than that of EN 1992-1-2 proposed up to 0.22%. Lower propylene fiber mixture ratio has been soak to improve the workability of 115~120MPa high strength concrete with steel fibers.

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An Experimental Study on the Fire Resistance Performance and Spalling of 100MPa HSC Column Mixed with Fiber-Cocktail

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.1370 ◽

2012 ◽

Vol 472-475 ◽

pp. 1370-1379 ◽

Cited By ~ 1

Author(s):

In Hwan Yeo ◽

Heung Youl Kim ◽

Hyung Jun Kim ◽

Kyung Ok Kim ◽

Chung Sup Oh

Keyword(s):

Fire Resistance ◽

High Strength Concrete ◽

Steel Fiber ◽

Polypropylene Fiber ◽

High Strength ◽

Cross Sectional ◽

Strength Concrete ◽

Steel Bar ◽

Section Size ◽

Resistance Performance

As the fire-resistance performance of high-strength concrete has emerged as a social issue and Korean Ministry of Land, Transport & Maritime Affairs has announced the standard for the fire-resistance performance of the concrete, studies to improve its fire-resistance have been conducted actively. In this paper, the study to develop high-strength concrete mixed with fiber-cocktail, a hybrid of polypropylene fiber and steel fiber was conducted. The fire-resistance test of 100MPa high-strength concrete and the analysis of steel bar temperatures for finding the optimal cross-sectional condition showed that the larger the section size is, the lower the temperature of steel bars is. It was also shown that the concrete columns with section sizes of 600mm x 600mm and 800mm x 800mm secure fire-resistance performance and the former is the optimal section size in terms of economic efficiency. The analysis of steel bar temperatures of the column having section size of 600mm x 600mm showed that the polypropylene fiber to steel fiber ratio of 1.5 to 40 (㎏/㎥) is the optimal for the fiber cocktail.

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Experimental Study on Shear Strength of Synthetic Fiber Reinforced High Strength Concrete Containing Slag Aggregate

Structures Congress 2019 ◽

10.1061/9780784482223.018 ◽

2019 ◽

Author(s):

Fouad T. Al Rikabi ◽

Husam H. Hussein ◽

Issam Khoury

Keyword(s):

Experimental Study ◽

Shear Strength ◽

High Strength Concrete ◽

High Strength ◽

Synthetic Fiber ◽

Fiber Reinforced ◽

Strength Concrete

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Experimental Study on the Max Crack Width of Steel Fiber Reinforced High-Strength Concrete Beams

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.851.798 ◽

2016 ◽

Vol 851 ◽

pp. 798-802

Author(s):

Qiao Yan Guan ◽

Juan Wang ◽

Ming En Zhang

Keyword(s):

Experimental Study ◽

High Strength Concrete ◽

Crack Width ◽

Steel Fiber ◽

Concrete Beams ◽

Volume Fraction ◽

High Strength ◽

Fiber Reinforced ◽

Strength Concrete ◽

Maximum Crack

The effect of volume fraction of steel fiber and the strength of reinforcement on the maximum crack width of steel fiber reinforced high-strength concrete beams was analyzed based on experimental results. In addition, the formula to calculate the maximum crack width of steel fiber-reinforced high-strength concrete beams was established.

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