Static and Dynamic Performances of Chopped Carbon-Fiber-Reinforced Mortar and Concrete Incorporated with Disparate Lengths.

Yeou-Fong Li,Ta-Wui Cheng,Ying-Kuan Tsai,Kun-Fang Lee,Gobinathan Kadagathur Ramanathan,Chih-Hong Huang

doi:10.3390/ma14040972

Yeou-Fong Li, Ta-Wui Cheng + Show 4 more

Open Access

https://doi.org/10.3390/ma14040972

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Abstract

The impact load, such as seismic and shock wave, sometimes causes severe damage to the reinforced concrete structures. This study utilized different lengths of chopped carbon fibers to develop a carbon-fiber-reinforced mortar (CFRM) and carbon-fiber-reinforced concrete (CFRC) with high impact and anti-shockwave resistance. The different lengths (6, 12, and 24 mm) of chopped carbon fibers were pneumatically dispersed and uniformly mixed into the cement with a 1% weight proportion. Then the CFRM and CFRC specimens were made for static and dynamic tests. The compressive and flexural strengths of the specimens were determined by using the standard ASTM C39/C 39M and ASTM C 293-02, respectively. Meanwhile, a free-fall impact test was done according to ACI 544.2R-89, which was used to test the impact resistances of the specimens under different impact energies. The CFRM and CFRC with a length of 6 mm exhibit maximum compressive strength. Both flexural and free-fall impact test results show that the 24 mm CFRM and CFRC enhances their maximum flexural strength and impact numbers more than the other lengths of CFRM, CFRC, and the benchmark specimens. After impact tests, the failure specimens were observed in a high-resolution optical microscope, to identify whether the failure mode is slippage or rupture of the carbon fiber. Finally, a blast wave explosion test was conducted to verify that the blast wave resistance of the 24 mm CFRC specimen was better than the 12 mm CFRC and benchmark specimens.

Highlights

Reinforced concrete structures are sometimes subjected to seismic and high impact loadings, which might cause catastrophic damage
A series of tests were conducted according to ASTM and ACI standards [32,33,34], to investigate the effect of different lengths of carbon fibers (6, 12, and 24 mm) on the compressive strength, flexural strength, and impact energy of the carbon-fiber-reinforced mortar (CFRM) and carbon-fiber-reinforced concrete (CFRC)
Compressive strengths with ferent lengths of fiber andand compared with a benchmark specimen different lengths of fiber compared with a benchmark specimen(without

Summary

Introduction

Reinforced concrete structures are sometimes subjected to seismic and high impact loadings, which might cause catastrophic damage. An impact load might be an aircraft taking off or landing on a runway, or a heavy vehicle passing over a bridge expansion joint; in a harbor, a ship may collide with a wharf due to the movement of the waves. These impact loadings cause damage, such as cracks and spalling, to the reinforced concrete pavement. Concrete is a brittle material and prone to cracks or damage when subjected to an external force, and the load-bearing capacity and its serviceability will be reduced. Fiber-reinforced concrete (FRC) has good mechanical properties and is used in multiple construction environments

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