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.

The Effect of Elevated Temperature on High Performance Fiber Reinforced Concrete

2015 ◽  
Vol 824 ◽  
pp. 191-195 ◽  
Author(s):  
Jan Fořt ◽  
Jaroslav Pokorný ◽  
David Čítek ◽  
Jiří Kolísko ◽  
Zbyšek Pavlík
Keyword(s):  
Reinforced Concrete ◽  
High Temperature ◽  
Elevated Temperature ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
Building Design ◽  
Fiber Reinforced Concrete ◽  
Material Structure ◽  
Fiber Reinforced ◽  
High Performance Fiber

High performance fiber reinforced concrete (HPFRC) became very popular material due to its high strength, elastic modulus, corrosion and fire resistance. However, detail description of HPFRC behaviour is necessary for its application and an effective building design and development. Here, also the fire safety of buildings must be considered. Therefore, the effect of elevated temperature on HPFRC is studied in the paper. For the reference material, experimental assessment of basic physical and mechanical properties is done. Then, the HPFRC samples are exposed to the temperatures of 600 and 800 °C respectively, and the effect of a high temperature exposure on material structure is examined. It is found that the applied high temperature loading significantly increases material porosity due to the physical, chemical and combined damage of material inner structure, and negatively affects also the pore size distribution.

Residual Mechanical Properties of Hybrid Fiber Reinforced HPC Exposed to High Temperatures

2016 ◽  
Vol 722 ◽  
pp. 52-58 ◽  
Author(s):  
Jan Fořt ◽  
Anton Trník ◽  
David Čítek ◽  
Zbyšek Pavlík
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Performance ◽  
Structural Changes ◽  
Simultaneous Thermal Analysis ◽  
Fiber Reinforced Concrete ◽  
Water Vapor Transport ◽  
Fiber Reinforced ◽  
Temperature Exposure ◽  
Hybrid Reinforcement

The effect of high temperature load on mechanical properties and porosity of a newly designed Ultra High Performance Fiber Reinforced Concrete (UHPFRC) is studied. The hybrid reinforcement of UHPFRC is based on a mixture of polypropylene and steel fibers. In order to identify influence of high temperature exposure on UHPFRC, its residual mechanical parameters such as compressive strength, flexural strength and Young’s modulus of elasticity are accessed. Moreover, residual bulk density, matrix density and total open porosity are examined and related to the monitored structural changes. Simultaneous Thermal Analysis (STA) is employed in order to describe transformation processes during high temperature loading. The conducted tests provide practical information for controlled regulation of water vapor transport in a low permeable cementitious composite in order to decrease risk of spalling.

High-temperature testing of high performance fiber reinforced concrete

2016 ◽  
Author(s):  
Jan Fořt ◽  
Eva Vejmelková ◽  
Milena Pavlíková ◽  
Anton Trník ◽  
David Čítek ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Temperature ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
High Temperature Testing ◽  
High Performance Fiber

scholarly journals Flexural (Moment) Capacity of Ultra-high Performance Fiber Reinforced Concrete Beams

2021 ◽  
Author(s):  
Madanat Jamil
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced ◽  
Flexural Capacity ◽  
Moment Capacity ◽  
Strain Compatibility ◽  
High Performance Fiber ◽  
Concrete Damage

Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) is a relatively new generation of cementitious material exhibiting exceptional mechanical characteristics. One of the main applications of this new material is strengthening existing bridges and the construction of new Igirders during the rehabilitation process. Previous research on (UHPFRC) beam girders and prestressed girders found the analytical moment capacity to be 76% of the experimental (test) results. A method based on strain compatibility, equilibrium and the stress-strain relationships is developed to determine the flexural capacity of UHPFRC beams with about 90% accuracy between experimental and numerical capacities. A testing program of five beam specimens is conducted at Ryerson University Structural Laboratory to verify the experimental results. Furthermore, the results of the finite element numerical simulation of ABAQUS software using concrete damage plasticity (CDP) constitutive model predict the flexural capacity of the tested UHPFRC beams reasonably well.

scholarly journals Flexural (Moment) Capacity of Ultra-high Performance Fiber Reinforced Concrete Beams

2021 ◽  
Author(s):  
Madanat Jamil
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced ◽  
Flexural Capacity ◽  
Moment Capacity ◽  
Strain Compatibility ◽  
High Performance Fiber ◽  
Concrete Damage

Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) is a relatively new generation of cementitious material exhibiting exceptional mechanical characteristics. One of the main applications of this new material is strengthening existing bridges and the construction of new Igirders during the rehabilitation process. Previous research on (UHPFRC) beam girders and prestressed girders found the analytical moment capacity to be 76% of the experimental (test) results. A method based on strain compatibility, equilibrium and the stress-strain relationships is developed to determine the flexural capacity of UHPFRC beams with about 90% accuracy between experimental and numerical capacities. A testing program of five beam specimens is conducted at Ryerson University Structural Laboratory to verify the experimental results. Furthermore, the results of the finite element numerical simulation of ABAQUS software using concrete damage plasticity (CDP) constitutive model predict the flexural capacity of the tested UHPFRC beams reasonably well.

Influence of technological factors on the properties of ultra-high-performance fiber reinforced concrete

2020 ◽  
pp. 135-147
Author(s):  
Igor Chilin ◽  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Technological Factors ◽  
High Performance Fiber

Приведены результаты исследований и выполнена оценка влияния технологических факторов на реологические свойства самоуплотняющихся сталефибробетонных смесей, определены кратковременные и длительные физико-механические и деформативные характеристики сверхвысокопрочного сталефибробетона, включая определение его фактической морозостойкости.

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