Aggregate Concretes after High Temperature Exposure
The high temperature behaviour of structural concrete has been studied for more than a century one of the earliest scientific contributions on this topic is 8 In the general case of conventional normal strength concretes and even for high strength concretes the evolution of
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The Effects of High Temperature on the Residual
Title The Effects of High Temperature on the Residual Compressive Strength of High Strength Siliceous Concretes Author s Roberto Felicetti and Pietro G Gambarova Publication Materials Journal Volume 95 Issue 4 Appears on pages s
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What is Concrete Temperature Limit The Constructor
In hot weather conditions AS 1379 requires that concrete temperatures at the point of delivery shall be within a range of 5°C to 35°C Concrete placed cured at a moderate temperature 15–25°C will gain higher strength durability than 35°C concrete
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High temperature resistance of concretes with GGBFS waste
These 28 and 90 day cured concretes were exposed to 200 400 600 800 and 1000 °C for 1 h After this high temperature treatment the test samples were subjected to two different cooling regimes as water cooling and air cooling The residual strength of the concretes
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High Temperature ConcretesFire Bricks Australia
High Temperature Concretes Refractory Castable cement Castable refractory cement is a pre mixed high temperature concrete All one has to do is add water to it and mix it well Once the mix solidifies it has very similar characteristics to fire bricks
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High temperature resistance of concretes with GGBFS waste
Especially high strength concretes are significantly influenced by high temperatures which lead to more cracking and spalling Even different fibers were used in the concretes subjected to high temperatures in order to reduce and prevent the effects of the cracks 6 7
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Properties of Concrete at Elevated Temperatures
At high temperature compressive strength is highly influenced by room temperature strength rate of heating and binders in batch mix such as silica fume fly ash and slag Unlike thermal properties at high temperature the mechanical properties of concrete are well researched
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Performance of high strength concretes at elevated
Concrete that is classed as high performance at room temperature–because of its high strength low permeability and consequently good durability–is in fact a low performance concrete at high temperature because of the increased susceptibility to spalling Zhukov observed that dense concretes showed an increased susceptibility to spalling over normal weight concretes
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IMPACT OF HIGH TEMPERATURES ON MULTIBLENDED
Key Words Concrete high temperature fire damage mechanical properties residual properties 1 INTRODUCTION Interest in the behaviour of concrete at a high temperature mainly results from the many cases of fires taking place in buildings high
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IMPACT OF HIGH TEMPERATURES ON MULTIBLENDED
properties at high temperature Owing to concrete s fairly low coefficient of thermal conductivity the movement of heat through concrete is slow and thus reinforced steel which is sensitive to high temperature is protected for a relatively long period of time When concrete is heated
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Performance of High Strength Concrete Subjected to
Felicetti R Gambarova PG 1998 Effects of high temperature on the residual compressive strength of high strength siliceous concretes ACI Mater J 95 395–406 Google Scholar 77 Balendran R Nadeem A Maqsood T Leung H 2003 Flexural and split cylinder strengths of HSC at elevated temperatures Fire Technol 39 1 47–61
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An Approach to Characterization of High Temperature
An Approach to Characterization of High Temperature Deformation Resistance of Asphalt Concretes using SD and FCWT Kwang W Kim JungS oi MinY YooandHyunH Kim Department of Regional Infrastructures Engineering Kangwon National University Chun Cheon Republic of Korea Corresponding Author e mail numgi hanmail
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Comparison between Ultra High Performance Concretes
mechanical properties of ultra high performance concretes including compressive strength splitting tensile strength fracture energy and elastic modulus Additionally explosive spalling of concretes exposed to high temperature up to 800 °C was also tested The
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Title Sustained High Temperature Effect on Concretes Made With Normal Portland Cement Normal Portland Cement and Slag or Normal Portland Cement and Fly Ash Author s G G Carette K E Painter and V M Malhotra Publication Concrete International Volume 4 Issue 7 Appears on pages s 16 Keywords Date 7/1/1982 Abstract This investigation was undertaken to determine the changes in
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Effect of Elevated Temperature on Mechanical Properties
alternative to other lightweight aggregates when high temperature resistance and low density are desired for con crete There have also been studies on the effect of tem perature on high strength and/or fiber reinforced concrete with or without supplementary cementitious materials Poon et al 2001 Cheng et al 2004 Savva et al 2005 Husem
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High temperature performance of mortars and concretes
This paper assesses the performance of mortars and concretes based on alkali activated granulated blastfurnace slag GBFS /metakaolin MK blends when exposed to high temperatures High stability of mortars with contents of MK up to 60 wt when exposed to 600 °C is identified with residual strengths of 20 MPa following exposure to this
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Properties of High Performance Concretes made of Black
Properties of High Performance Concretes made of Black Sand at High Temperature To modify high performance concrete HPC fireproofing properties black sand BS was partially substituted as fine aggregate at various levels
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High temperature performance of mortars and concretes
This paper assesses the performance of mortars and concretes based on alkali activated granulated blastfurnace slag GBFS /metakaolin MK blends when exposed to high temperatures High stability of mortars with contents of MK up to 60 wt when exposed to 600 °C is identified with residual strengths of 20 MPa following exposure to this temperature
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Effect of high temperature on immobilization of heavy
temperature of 105°C After that concretes were treated by high temperatures 200 0C 400C 600C in a muffle furnace Fig 1 The range of the temperatures and the course of the process are presented in Fig 2 The specimens were stored in the object temperature over the period of one hour in order to secure the uniform heating of the concrete
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IRJET IMPACT OF HIGH TEMPERATURES ON MULTIBLENDED CONCRETES
Ultrasonic pulse velocity and Compressive Strength TestThe water cured cubes were dried in air at a temperature of 27 0 ± 2 0 C with relative humidity RH > 90 prior to getting exposed to a high temperature regime up to 1000 0 C in steps of 100 0 C in a hot air oven/muffle furnace for a constant retention period of 5 h
Get PriceMechanical behaviour of ultra high strength concrete at
Then the temperature dependent mechanical properties were compared with those of normal/high strength concretes provided in Eurocode 2 and ANSI/AISC 360 10 and with those of concretes in literature The comparisons showed that the compressive strength and elastic modulus of the UHSC were generally reduced less than those of normal/high
Get PriceEffect of High Temperature Curing Methods on the
The high temperature curing parameters used in this study were the delay period temperature rise peak temperature PT peak period and temperature down Test results demonstrate that the compressive strength of the samples with PTs of 65°C and 75°C was about 88 higher than that of the samples with a PT of 55°C after 1 day
Get PriceResidual Mechanical Properties of High Strength Concretes
This paper presents the results of a study on the effect of high temperatures on the mechanical properties of high strength concretes Mixtures were prepared with water to cementitious material ratios of 0 40 0 35 and 0 30 containing silica fume at 0 6 and 10 cement replacement
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Effects of High Temperatures on the Physical and
confirmed that 400°C was the critical temperature for performances degradation of concrete Yang et al 17 performed a series of high temperature tests 400 500 550 and 600°C on cylindrical concrete specimens to predict the residual mechanical strengths by using the ultrasonic pulse velocity
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Effects of High Temperature on the Residual
In this work we analyzed the residual performance of Portland cement concretes heat treated at 600 °C after cooling down to room temperature Concretes with characteristic compressive strength at 28 days of 45 MPa and of 60 MPa were studied The heat treatment was carried out without any imposed load We measured the residual compressive strength and modulus of elasticity
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The influence of temperature on the microstructure of concrete produced with desert sand was also analyzed using X ray diffraction XRD and Scanning Electron Microscope SEM After curing the samples for 28 days CSL 26 17 heating furnace with a ultimate temperature of 1600 °C was used to carry out elevated temperature test
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High temperature behavior of self compacting concretes
This chapter presents state of the art understanding of high temperature SCC behavior First the physico chemical changes which occur inside SCCs when a high temperature exposure is examined from the perspective of knowledge acquired on high temperature behavior of conventional vibrated concretes
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Fracture toughness of concretes at high temperature
The fracture toughness of ordinary and refractory concretes in the range of 20–1300‡C was investigated and the stress intensity factor K Ic on three point bent specimens according to ASTM E 399 recommendation determined With an increase in testing temperature the stress intensity factor decreases for both concretes The values of K Ic at 20‡C for both concretes are comparable
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Properties of Concrete at Elevated Temperatures
At high temperature compressive strength is highly influenced by room temperature strength rate of heating and binders in batch mix such as silica fume fly ash and slag Unlike thermal properties at high temperature the mechanical properties of concrete are well researched
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The Effect of Elevated Temperature on Concrete Materials
The effects of elevated temperature on high strength concrete materials are noted and their performance compared to normal strength concretes A review of concrete materials for elevated temperature service is presented Nuclear power plant and
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PDF Performance of high strength concretes at elevated
concrete at high temperatures Report No 92 Department of Structural 14 Aydin S Yazıcı H and Baradan B High temperature resistance of Engineering Helsinki University of Technology Helsinki Finland p 76 normal strength and autoclaved high strength mortars incorporated 1989
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High temperature behaviour of self consolidating concrete
In case of fire concrete is exposed to high temperature that induces a material degradation strength decrease cracking and in some conditions spalling Up to now the effect of elevated temperature has been studied mainly on vibrated ordinary and high performance concretes
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The severe disruption of concrete under sustained exposure at 150 C 302 F is attributed to the instability of some coarse aggregate particles at this temperature
Get PriceHigh Performance Concrete Chapter 17
High performance concretes are made with carefully selected high quality ingredients and optimized mixture designs these are batched mixed placed compacted and cured to the highest industry standards Typically such concretes will have a low water cementing materials ratio of 0 20 to 0 45 Plasticizers are usually used to make
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Properties of Concrete at Elevated Temperatures
At high temperature compressive strength is highly influenced by room temperature strength rate of heating and binders in batch mix such as silica fume fly ash and slag Unlike thermal properties at high temperature the mechanical properties of concrete
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Concrete Curing Temperature Makes a Difference
Concrete Cure Time Chart with Temperature At an age of 1 day the 120°F concrete was strongest and the 25°F concrete was weakest By 7 days the high temperature cured concretes had no more strength than the 73°F concrete or even less By the age of 28 days the high temperature concretes were weaker than the 73°F concrete
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