Dynamic tensile behaviour of high performance fibre reinforced cementitious composites after high temperature exposure

2013 ◽  
Vol 59 ◽  
pp. 87-109 ◽  
Author(s):  
Alessio Caverzan ◽  
Ezio Cadoni ◽  
Marco di Prisco
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Tensile Behaviour ◽  
Cementitious Composites ◽  
High Temperature Exposure ◽  
Temperature Exposure ◽  
High Performance Fibre

scholarly journals Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol.% of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol.% of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance.

2017 ◽  
Keyword(s):  
High Temperature ◽  
Fire Resistance ◽  
High Performance ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
Experimental Results ◽  
Explosive Spalling ◽  
Design Strength ◽  
High Temperature Exposure ◽  
Temperature Exposure

scholarly journals Tensile behaviour identification in Ultra-High Performance Fibre Reinforced Cementitious Composites: indirect tension tests and back analysis of flexural test results

2020 ◽  
Vol 53 (6) ◽  
Author(s):  
Francesco Lo Monte ◽  
Liberato Ferrara
Keyword(s):  
High Performance ◽  
Tensile Behaviour ◽  
Cementitious Composites ◽  
Test Results ◽  
Direct Tension ◽  
Identification Procedure ◽  
Horizon 2020 ◽  
Tension Tests ◽  
Indirect Tension ◽  
High Performance Fibre

AbstractWithin the framework of the European Programme Horizon 2020, the Research Project ReSHEALience is currently running with the objective of developing a new approach for the design of structures exposed to extremely aggressive environments, based on Durability Assessment based Design and Life Cycle Analysis. To this aim, new advanced Ultra-High Performance Fibre Reinforced Cementitious Composites with improved durability, called Ultra-High Durability Concretes, are under investigation to characterize their tensile response in both ordinary and very aggressive conditions. In this context, the first step is to develop an effective approach for identifying the main parameters describing the overall behaviour in tension. In the present study, indirect tension tests have been performed via two techniques, based on Double Edge Wedge Splitting and 4-Point Bending Tests. Starting from the test results, a combined experimental-numerical identification procedure has been implemented in order to evaluate the effective material behaviour in direct tension in terms of stress–strain law. In the paper, the mechanical characterization for the reference mix is reported so to describe the identification procedure adopted.

scholarly journals "Flexural Performance of Hybrid Fiber Reinforced Cement Composites Under Elevated Temperatures"

2018 ◽  
Vol 6 (2) ◽  
pp. 113-119
Author(s):  
Isam M. Ali ◽  
Ali H. Adheem
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Steel Fibers ◽  
Flexural Behavior ◽  
Experimental Program ◽  
Cement Composites ◽  
Hybrid Fiber ◽  
High Temperature Exposure ◽  
Flexural Performance ◽  
Temperature Exposure

"Historically, the flexural behavior of hybrid fiber cement composites is not completely understood using the traditional test methods. This research presents the results of an experimental investigations on a high performance cement composites (HPCC) containing both micro steel fibers (SF) and micro polypropylene fibers (PP) before and after elevated temperature exposure. The experimental program was developed to study the flexural performance (flexural strength, toughness and stiffness) under high temperature using mono and hybrid (SF) and (SF + PP) fibers. Mixtures were divided into eight different groups, with constant w/c of 0.28 and different fibers content. Based on the results of this research, the replacing of micro (SF) in high performance cement composites by 15 % of micro (PP) fibers is recommended at high temperature exposure due to the fact that all hybrid fiber HPCC specimens show slight decreasing in flexural behavior compared to samples reinforced with 1% volume fraction of mono steel fibers after high temperature exposure."

The Effect of High Temperature Exposure on Properties of Hybrid Fiber Reinforced UHPC

2017 ◽  
Vol 909 ◽  
pp. 275-279
Author(s):  
Jan Fořt ◽  
David Čítek ◽  
Milena Pavlíková ◽  
Zbyšek Pavlík
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Structural Changes ◽  
Physical And Mechanical Properties ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
High Temperature Exposure ◽  
High Performance Fiber ◽  
Concrete Damage ◽  
Temperature Exposure

High Performance Fiber Reinforced Concrete (HPFRC) became very popular material for its high mechanical strength, elastic modulus and corrosion resistance. However, also its high-temperature resistance is of a particular importance because of the fire safety. Therefore, the effect of high-temperature exposure on UHPC reinforced by combination of steel and PVA fibers was studied in the paper. PVA fibers were used to moderate concrete damage induced by water vapor evaporation from dense UHPC matrix. The UHPFRC samples were exposed to the temperatures of 200 °C, 400 °C, 600 °C, 800 °C, and 1 000 °C respectively. Concrete structural changes induced by high temperature action were described by the measurement of basic physical and mechanical properties. The realized experiments provide information on the changes of concrete porosity and loss of mechanical resistivity.

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