Hybrid Fiber Reinforced HPC at Elevated Temperatures
7 P. Kalifa G. Chene Ch. Galle High-temperature behaviour of HPC with polypropylene fibers from spalling to microstructure Cem. Concr. Res. 31 (2001) 1487–1499. 8 International Union of Testing and Research Laboratories for Materials and Structures Recommendations for Testing and Use of Constructions Materials E FN SPON 1994
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Behavior of HPC with Fly Ash after Elevated Temperature
The flexural strength of HPC at elevated temperature (MPa). In the temperature range of 20°C to 200°C temperature has a slight bearing on the cleavage compressive strength of two types of HPC concrete. The cleavage strength at 300°C of C50 and C60 is about 99.7 and 91.6 of the original strength (at 20°C) respectively.
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Modelling explosive spalling and stress induced thermal
strains of HPC exposed to high temperature J. Ožbolt and J. Bošnjak Institute for Construction Materials University of Stuttgart Germany Abstract. Permeability of concrete without and with polypropylene fibres is experimentally measured at temperatures up to 300 C by employing a new test setup. To investigate explosive spalling of concrete
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Flexural Strength of C40 HPC after Elevated High
After 51 C40 HPC specimens with a size of 100mm 100mm 400mm were heated to 400°C 600°C 700°C 800°C for 2 hours and 300°C and 500°C for 1h 2h 3h 4h 5h separately cooled naturally and placed for 24 hours the flexural strength were experimented respectively. Subsequently the effect of high temperature and its acting time on the flexural strength of HPC and the variation
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Tensile Behavior of High-Density Polyethylene Including
polyethylene structure. High Density Polyethylene (HDPE) has high rigidity strength and better creep behavior. Global demand for High-Density Polyethylene (HDPE) resins has been increasing going from 11.9 million tons in 1990 to 43.9 million tons in 2017 with an annual growth of 3.3 4 .
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Klucel hydroxypropylcelluloseAshland
Selected Grades of Klucel HPC 4.2 Dispersion and Dissolution Klucel HPC is soluble in water at room temperature. It is insoluble in water above 45°C. It is readily soluble in many organic solvents hot or cold. The best methods for preparing solutions of Klucel HPC in water or organic solvents are described in the following paragraphs.
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VISCOSITY OF HYDROXYPROPYL CELLULOSE SOLUTIONS
HPC is soluble in cold water but above 40 C ° 9.5 a phase separation occurs with a decrease of viscosity and a sharp increase in turbidity. 4 5. The rheological behavior of HPC in liquid It was shown that below 39°C in dilute aqueous solution the HPC macromolecules exist in a
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Vapor Pressure Modeling for Fire Damage Assessment of HPC
High-performance concrete will undergo severe damage under fire conditions. It is well known that vapor pressure induced by high temperatures plays an important role in the damaging process. This paper presents a method of vapor pressure modeling called equivalent expansion method which can be implemented in FEM analysis. The modeling procedure consists of two parts i.e. vapor pressure
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High-temperature behaviour of HPC with polypropylene
Oct 01 2001 · High-temperature behaviour of HPC with polypropylene fibres From spalling to microstructure 1. Introduction. The sometimes-brittle behaviour of certain high-performance concretes (HPCs) under fire conditions may 2. Materials. The PP fibres used have a
Get PriceImproving the high performance concrete (HPC) behaviour in
Improving the high performance concrete (HPC) behaviour in high temperatures . some researchers have reported that the addition of polypropylene fibers to HPC is a suitable way to avoid explosive spalling under f re conditions. This change in behavior is derived from the fact that polypropylene fibers melt in high temperatures and leave a
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Improving the high performance concrete (HPC) behaviour in
Improving the high performance concrete (HPC) behaviour in high temperatures . some researchers have reported that the addition of polypropylene fibers to HPC is a suitable way to avoid explosive spalling under f re conditions. This change in behavior is derived from the fact that polypropylene fibers melt in high temperatures and leave a
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HPC Subjected to High Temperature A Study on Intrinsic
Heat-exposed High-Performance Concrete (HPC) has been the subject of relatively few studies focused on the relationship between the chemo-physical processes occurring in concrete constituents (microscopic level) and concrete mechanical properties (macroscopic level). In order to investigate the correlation between the intrinsic damage and the mechanical damage induced by heat exposure
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High temperature behaviour of polypropylene fibres
Abstract. International audienceThe aim of this paper is primarily experimental and is intended to analyse the behaviour of two cementitious materials before and after heat treatment one unreinforced (i.e. without fibres) and the other reinforced (with polypropylene fibres).At room temperature and after heating up to 500 °C the bending strength is improved by the presences of fibres.
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Klucel hydroxypropylcelluloseAshland
Selected Grades of Klucel HPC 4.2 Dispersion and Dissolution Klucel HPC is soluble in water at room temperature. It is insoluble in water above 45°C. It is readily soluble in many organic solvents hot or cold. The best methods for preparing solutions of Klucel HPC in water or organic solvents are described in the following paragraphs.
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Temperature Considerations in Plastic Thermoforming
Jun 27 2016 · Distortion. Exceeding a material s approximate heat deflection temperature can cause the material to distort. Prolonged exposure to heat while subjected to a load or force can also cause plastic to deform or "creep" over time. Most thermoplastic materials have a heat distortion temperature (HDT) of less than 500 degrees F.
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Hybrid Fiber Reinforced HPC at Elevated Temperatures
7 P. Kalifa G. Chene Ch. Galle High-temperature behaviour of HPC with polypropylene fibers from spalling to microstructure Cem. Concr. Res. 31 (2001) 1487–1499. 8 International Union of Testing and Research Laboratories for Materials and Structures Recommendations for Testing and Use of Constructions Materials E FN SPON 1994
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The Effects of Temperature Plastics Technology
Jul 27 2011 · At room temperature the elastic modulus for both materials agrees with the tensile modulus quoted on the data sheet to within 2-3 . But while most data sheets provide little or no information on the effect of temperature on properties the plots in Fig. 1 give a complete map of the temperature-dependent behavior for the two materials.
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Improving the high performance concrete (HPC) behaviour in
Improving the high performance concrete (HPC) behaviour in high temperatures . some researchers have reported that the addition of polypropylene fibers to HPC is a suitable way to avoid explosive spalling under f re conditions. This change in behavior is derived from the fact that polypropylene fibers melt in high temperatures and leave a
Get PriceThermal behaviour of unstressed and stressed high strength
Dec 11 2017 · The purpose of this paper is to evaluate high strength concrete (HSC) containing polypropylene fibers (PP-fibers) at high temperature under a compressive load. The use of PP fibers in HSC is known to reduce and at times eliminate the risk of spalling. HSC containing 0 1 and 2 kg/m3 of PP-fibers were subjected to various temperatures from 20°C to 150°C 300°C and 450°C and
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Improving the high performance concrete (HPC) behaviour in
Improving the high performance concrete (HPC) behaviour in high temperatures . some researchers have reported that the addition of polypropylene fibers to HPC is a suitable way to avoid explosive spalling under f re conditions. This change in behavior is derived from the fact that polypropylene fibers melt in high temperatures and leave a
Get Price
High-temperature behaviour of HPC with polypropylene
High-temperature behaviour of HPC with polypropylene fibres The addition of polypropylene (PP) fibres to high-performance concrete (HPC) is one way to avoid spalling of concrete under fire conditions. The present work contributes both to the understanding of the way in which fibres act and to optimising the fibre dosage. Pore pressure
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High temperature behaviour of polypropylene fibres
Abstract. International audienceThe aim of this paper is primarily experimental and is intended to analyse the behaviour of two cementitious materials before and after heat treatment one unreinforced (i.e. without fibres) and the other reinforced (with polypropylene fibres).At room temperature and after heating up to 500 °C the bending strength is improved by the presences of fibres.
Get PriceFIRE PERFORMANCE OF BASALT FRP MESH REINFORCED HPC
high temperature than carbon fibres (Sim et al. 2005) hence the choice of basalt over more expensive carbon or aramid FRPs. The fire safety of such elements remains a challenge because of the spalling behaviour of HPC at elevated temperatures (Phan et al. 2001 Hertz 2003) which has also been observed in previous testing within the
Get PriceResearch on the seismic behavior of HPC shear walls after
Prior to the cyclic test three specimens are subjected to elevated temperatures (400°C 600°C) and two of them are mixed with polypropylene fiber. Based on experimental results different curves are drawn and analyzed to study the seismic behavior of BFS-HPC shear walls after fire.
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Effects of elevated temperature exposure on heating
Materials and Structures/Materiaux et Constructions Vol. 34 March 2001 pp 83-91 Effects of elevated temperature exposure on heating characteristics spalling and residual properties of high performance concrete L. T. Phanl J. R. Lawson2 and F. L. David
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Properties of Concrete at Elevated Temperatures
P. Kalifa G. Chéné and C. Gallé "High-temperature behaviour of HPC with polypropylene fibres—from spalling to microstructure " Cement and J. Costaz "Thermal stresses and water vapor pressure of high performance concrete at high temperature " in Proceedings of the 4th International Symposium on Utilization of High-Strength
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L.T. Phan High-strength concrete at high temperature-An overview in Proceedings of 6th International Symposiumon Utilization of High Strength/ High Performance Concrete Leipzig Germany 2002
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(PDF) The Impact of Amount and Length of Fibrillated
I The behaviour of high performance concrete (HPC) exposed to high temperature can prove a major limitation on the use of such concrete in the construction industry. HPC exposed to high temperature can be prone to explosive spalling which could result in the exposure of steel reinforcement.
Get PriceThermal behaviour of unstressed and stressed high strength
Dec 11 2017 · The purpose of this paper is to evaluate high strength concrete (HSC) containing polypropylene fibers (PP-fibers) at high temperature under a compressive load. The use of PP fibers in HSC is known to reduce and at times eliminate the risk of spalling. HSC containing 0 1 and 2 kg/m3 of PP-fibers were subjected to various temperatures from 20°C to 150°C 300°C and 450°C and
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