TAILIEUCHUNG - High performance concrete under elevated temperatures

In this study, PP fibers and air entraining admixture (AEA) were used together in an high performance concrete (HPC) mix so as to create interconnected reservoirs in concrete and to improve fire performance of HPC. For this reason, nine mixes of HPC incorporating blast furnace slag with water-to-binder ratio and various PP and AEA contents were produced. Specimens were cast in two different sizes in order to see the effect of size and 18 series of specimens were obtained. These series subjected to elevated temperatures (300 C, 600 C and 900 C) with a heating rate of 10 C/min and after air cooling, residual mass and compressive strength of specimens were determined. The heated specimens were observed both at macro and micro scales to investigate the color changes, cracking and spalling of HPC at various temperatures. Also, thermogravimetric analyses were performed on powder samples from each nine mixes. Results showed that addition of AEA diminished the decrease in residual strength but this result was found to be irregular after 300 C for thick specimens. The collaboration of AEA and PP fibers decreased the risk of spalling of HPC. Also, size of specimen was found to be important in deterioration of HPC. | Construction and Building Materials 44 2013 317-328 ELSEVIER Contents lists available at SciVerse ScienceDirect Construction and Building Materials journal homepage locate conbuildmat High performance concrete under elevated temperatures Abdullah Huzeyfe Akca Nilufer Ozyurt Zihnioglu Department of Civil Engineering Bogazipi University Istanbul Turkey Construction and Building MATERIALS CrossMark HIGHLIGHTS Performance of HPCs under elevated temperatures. Use of PP fibers with air entraining admixture to decrease damage. Decreased spalling and increased residual strength. Complete disintegration of dense matrix under very high temperatures. Microstructural examination of cement paste-aggregate interface. ARTICLE INFO ABSTRACT Article history Received 4 February 2013 Received in revised form 28 February 2013 Accepted 2 March 2013 Available online 10 April 2013 Keywords High performance concrete Elevated temperatures Polypropylene fibers Air entraining admixture ESEM In this study PP fibers and air entraining admixture AEA were used together in an high performance concrete HPC mix so as to create interconnected reservoirs in concrete and to improve fire performance of HPC. For this reason nine mixes of HPC incorporating blast furnace slag with water-to-binder ratio and various PP and AEA contents were produced. Specimens were cast in two different sizes in order to see the effect of size and 18 series of specimens were obtained. These series subjected to elevated temperatures 300 C 600 C and 900 C with a heating rate of 10 C min and after air cooling residual mass and compressive strength of specimens were determined. The heated specimens were observed both at macro and micro scales to investigate the color changes cracking and spalling of HPC at various temperatures. Also thermogravimetric analyses were performed on powder samples from each nine mixes. Results showed that addition of AEA diminished the decrease in residual strength but this .

• Kiến trúc - Xây dựng
• High performance concrete
• Elevated temperatures
• Concrete under elevated temperatures
• Improve fire performance of HPC
• Investigate the color changes
• Nuclear engineering and technology
• Ultra high performance fiber reinforced concrete nuclear waste container
• High level waste
• Ultra high performance fiber reinforced concrete material
• The dry storage container
• Canadian Nuclear facilities
• Effects of high temperatures
• Mechanical behavior
• High strength concrete reinforced
• High performance synthetic macro polypropylene
• Macro polypropylene (HPP) fibres
• Mechanical properties
• Microstructure of high strength concrete containing
• Polypropylene fibres exposed
• High strength concrete containing
• Ultra high performance concrete
• Explosive load
• Damage area
• Ordinary concrete
• Real scale and structure
• Reinforced concrete
• Mix design of high volume fly
• Mix design
• Packing density
• Curing condition
• High volume fly ash
• Silica fume
• Compressive strength
• UHPC compositions
• Cementitious materials
• Rice husk ash
• Alkali silica reaction
• UHPC containing rice husk ash
• Shear resistance
• Confining pressure effect
• Smooth fiber
• Ultra high performance fiber reinforced concrete
• Confining pressure on shear resistance
• Micromechanical properties
• Statistical analysis
• Grid nanoindentation
• Including indentation modulus
• Glass fiber reinforcement
• Coastal protection structures
• Several types
• Flexural strength
• Nuclear energy
• Heavyweight aggregates
• Linear attenuation coefficient
• Half value layer
• Tenth value layer
• Synergy effect
• Strain rate dependent
• High strain rates
• Mix proportion
• Multi objective optimization
• Pareto solution
• Visual Interactive Analysis Method
• Matlab code
• Hybrid cement composite
• Elastic modulus
• Fibre reinforced concrete
• Steel fibers
• Composite columns
• UHPC formwork
• Normal strength concrete
• Paving flag
• Failure load
• Sand bedding
• Loading plate
• Ultra High Performance Fibre Reinforced Concrete
• Tạp chí Khoa học Công nghệ Xây dựng
• trình bày báo cáo
• tài liệu báo cáo nghiện cứu khoa học
• cách trình bày báo cáo
• báo cáo ngành văn học
• báo cáo tiếng anh
• Compressive and tensile stresses
• The temperature influence
• Nonuniform biaxial type of compression
• Strength of concrete
• The Multiaxial compression
• High performance
• Composite beam
• Shear failure
• Bending resistance
• Load carrying capacity
• First cracking
• Post cracking
• Hybrid fiber
• Micro cracks
• Tensile properties