high temperature concretes

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.

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

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

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.

Sustained High Temperature Effect on Concretes Made With

 · 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.

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

High-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

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

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.

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.

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.

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.

Effect 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.

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.

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.

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

High-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

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

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.

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.

Sustained High Temperature Effect on Concretes Made With

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

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.

High Temperature Behaviour of Concrete Produced with

 · 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.

High-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

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

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

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

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.

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

Mechanical 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

Sustained High Temperature Effect on Concretes Made With

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

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