scholarly journals Fire-Temperature Influence on Portland and Calcium Sulfoaluminate Blend Composites

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5230
Author(s):  
Konrad A. Sodol ◽  
Łukasz Kaczmarek ◽  
Jacek Szer
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Significant Influence ◽  
Strength Properties ◽  
Temperature Elevation ◽  
Temperature Influence ◽  
Fire Temperature ◽  
Calcium Sulfoaluminate ◽  
Dsc Method ◽  
In Fire

This paper presents the research data of the fire-temperature influence on Portland CEM I (OPC) and calcium sulfoaluminate (CSA) types of cement blend composites as cooling materials dedicated for infill and covers in fire systems. The data present the material responses for four types at high-temperature elevation times (0, 15, 30, 60 min), such as core heat curves, differences in specimens color, flexural and compressive strength parameters. Materials were tested using the DSC method to collect information about enthalpies. The differences between cement blend composites were compared with commonly used cooling materials such as gypsum blends. It is shown that modifications to Portland cement composites by calcium sulfoaluminate cement have a significant influence on the cooling performance during high-temperature, even for 60 min of exposure. The temperature increase rates in the material core were slower in composites with regards to additionally containing calcium sulfoaluminate in 100–150 °C range. After 60 min of high-temperature elevation, the highest flexural and compressive strength was 75% OPC/25% CSA cement composition. The influence on cooling properties was not related to strength properties. The presented solution may have a significant influence as a passive extinguisher solution of future fire resistance systems in civil engineering.

scholarly journals Impact of Elevated Temperatures on Strength Properties and Microstructure of Calcium Sulfoaluminate Paste

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6751
Author(s):  
Konrad A. Sodol ◽  
Łukasz Kaczmarek ◽  
Jacek Szer ◽  
Sebastian Miszczak ◽  
Mariusz Stegliński
Keyword(s):  
Compressive Strength ◽  
Building Materials ◽  
Elevated Temperatures ◽  
Cooling System ◽  
Base Material ◽  
Visual Assessment ◽  
Strength Properties ◽  
Strength Parameters ◽  
Calcium Sulfoaluminate ◽  
Wide Range

This article is motivated by civil fire safety. Fire-prevention engineering demands a wide range of information about building materials including alternative cements, for instance CSA-cement. Because of exposure of the cement-base material to a high temperature, its strength properties deteriorate due to dehydration connected with phase and microstructure changes. Previous research indicated that the main endothermic reaction of CSA-based composite, dehydration of ettringite, might be used as a cooling system for a metal structure during fire-load. This article examines visual assessment, microstructure, density, as well as flexural and compressive strength parameters of CSA-based composite after isothermal heating at temperatures from 23 °C to 800 °C. The results of SEM/EDS investigations showed that the calcium sulfoaluminate paste may start partially re-sintering above 600 °C. Mechanical tests revealed significant reduction of strength parameters but residual compressive strength was maintained in the whole temperature range e.g., 8 MPa at 800 °C. Additionally, visual assessment of the specimens indicated that it might be possible to predict the material temperature heating based on the specific surface color. These findings add to the evidence of general knowledge about CSA hydrates.

scholarly journals The influence of reinforcement temperature on stiffness of reinforced concrete beams in fire conditions

2013 ◽  
Vol 12 (1) ◽  
pp. 115-122
Author(s):  
Michał Głowacki ◽  
Marian Abramowicz ◽  
Robert Kowalski
Keyword(s):  
High Temperature ◽  
Cross Section ◽  
Static Load ◽  
Concrete Beams ◽  
Bending Moment ◽  
Reinforced Concrete Beams ◽  
Temperature Influence ◽  
Calculation Results ◽  
Tensile Zone ◽  
In Fire

This paper describes the analysis of high temperature influence on beams with heated tensile zone. High temperature experiments were preformed under the static load of 50 or 70% of the destructive force ensuring constant value of bending moment in the central part of the heated beam. Beams with 2 reinforcement ratios – 0.44 and 1.13% were examined. In total four series of beams, three in each series (12 elements) were used. This paper analyses the reduction of relative beam cross section stiffness depending on reinforcement temperature. Experimentally obtained stiffness values calculated in two ways (element maximal deflection and deflection measured in three points of analysed element) were compared to calculation results made according to Eurocode. The performed analysis shows that reduction of the stiffness of element based on Eurocode calculations is slightly bigger than the experimentally obtained one.

Investigation on Thermal Stability of Geopolymer Based Zeolite in Fire Case Study

2020 ◽  
Vol 1009 ◽  
pp. 31-36
Author(s):  
Kanokwan Kanyalert ◽  
Prinya Chindaprasirt ◽  
Duangkanok Tanangteerapong
Keyword(s):  
Weight Loss ◽  
Compressive Strength ◽  
High Temperature ◽  
Fly Ash ◽  
Alkali Activation ◽  
Different Types ◽  
Temperature Exposure ◽  
In Fire ◽  
Thermal Stability Of

This work aims to reveal the effects of zeolite on properties of fly ash based geopolymer under high temperature at 300 °C, 600 °C and 900 °C. The specimens were prepared by alkali activation of fly ash, which was partially replaced by two different types of zeolite at 10%, 20% and 30% by weight. The specimens were analyzed for the maximum compressive strength, weight loss percentage, XRD and SEM. The results highlighted that the percentage of weight loss increased with the ratio of zeolite replacement. The compressive strength of geopolymer with synthetic zeolite and natural zeolite at 7, 28, 60 days were similar. The high-temperature exposure resulted in the reduction in compressive strength in all proportions. At the same temperature, compressive strength of all specimens were not significantly different.

scholarly journals Research into steel-concrete bond in fire conditions

2008 ◽  
Vol 2 (1) ◽  
pp. 005-018
Author(s):  
Zoja Bednarek ◽  
Paweł Ogrodnik
Keyword(s):  
Fire Tests ◽  
Temperature Influence ◽  
Fire Temperature ◽  
Reinforced Steel ◽  
In Fire ◽  
Bond Tests ◽  
Fire Conditions

The article presents results from the research into fire temperature influence on steel-concrete bond and on the bond reduction for both in-fire and after-fire status. Bond tests and its results for materials St3S, 18G2 reinforced steel and C16/20, C40/50 concrete, have been described in the article both for in fire and after-fire conditions. All tests have shown a significant reduction of steel-concrete bond as a result of fire temperature. It was proven, that significant bond differences exist between in-fire and after-fire tests, what demonstrate that the bond is regained partially after the exposure.

Preparation and Properties Investigation of Active High Temperature Resistant Insulation Material

2013 ◽  
Vol 641-642 ◽  
pp. 469-472
Author(s):  
Wen Long Tang ◽  
Chun Rong Tian ◽  
Xiao Rong Jia ◽  
Gui Sheng Chen
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Impact Strength ◽  
Fire Test ◽  
Front Surface ◽  
Insulation Material ◽  
Thermal Coefficient ◽  
Complex Material ◽  
Physical Strength ◽  
In Fire

The active high temperature resistant insulation material is devised to fulfill the specified requirements of the packing material. The complex material K2O.6TiO2 whisker/expanded perlite/resol was prepared in 20mm thickness, its back temperature was stable below 180°C in fire test with its front surface burned by the fire at 950°C—1050°C, but its compressive strength was 4.22MPa and its impact strength was just 0.43 kj/m2 Whereas the back temperature of the complex material Al2(SiO3)3 fiber/resol was stable below 140°C under the same test condition and its density and physical strength can be control. the compressive strength of the complex material Al2(SiO3)3 fiber/resol was between 5.0MPa and 30.0MPa versus the density between 0.75g/cm3 and 1.05g/cm3 while its impact strength was hardly influenced by the density. The thermal coefficient of the material through the fire test became lower. The analysis of its structure and thermal behavior show the complex material prepared possesses the function of active high temperature resistant insulation.

Effects of Foreign Ions on Minerals of High Belite-Calcium Sulfoaluminate Cement

2013 ◽  
Vol 743-744 ◽  
pp. 239-244
Author(s):  
Juan Li ◽  
Chun Ying Zhou ◽  
Ya Jin Yang
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Powder Diffraction ◽  
High Reactivity ◽  
Calcium Sulfoaluminate Cement ◽  
X Ray ◽  
Calcium Sulfoaluminate ◽  
Foreign Ions ◽  
Mineral Components ◽  
Positive Effect

The influence of foreign ions doping on the property of belite - sulfoaluminate (BCSA) clinker with belite and calcium sulfo-aluminate as main minerals was investigated. The research on four foreign doping ions with P5+, B2+, Ba2+, and Zn2+was carried out. The mineral components were characterized by SEM, X-ray powder diffraction and Infrared. Some foreign ions entering into the lattice of β-C2S and during sintering at high temperature attained a high reactivity. The mechanism of the effect of these ions on stabilization and activation of minerals were clarified. Results revealed that P5+, Ba2+, and Zn2+could stabilize and activate β-C2S as well as enhance reactivity of, but no positive effect of ion B2+was observed. The sequence of influence of different ions on C2S is: Ba2+>P5+>Reference>Zn2+>B3+, and the sequence for was: P5+>Ba2+>Zn2+>Reference>B3+. Compared to the 28-d compressive strength of reference one, P5+, Ba2+, and Zn2+could enhance the strength by 15.6%, 8.9% and 26.5% respectively.

scholarly journals Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1222 ◽  
Author(s):  
Yuli Wang ◽  
Jie Yu ◽  
Junjie Wang ◽  
Xuemao Guan
Keyword(s):  
Compressive Strength ◽  
Aluminum Sulfate ◽  
Setting Time ◽  
Strength Properties ◽  
X Ray Diffraction ◽  
Cement Slurry ◽  
Calcium Sulfoaluminate ◽  
Optimum Content ◽  
Grouting Material ◽  
Grouting Materials

Grouting materials are used frequently in grouting reinforcement projects, such as mining and coastal engineering. Double liquid grouting materials are mostly used because of the fast setting and high early strength properties when the two slurries are mixed together but high fluidity when the two slurries are separated. In our study, double liquid grouting materials were developed from CSA cement (slurry A), quicklime and fluorgypsum (slurry B). Aluminum sulfate was added in slurry B in order to counteract any adverse effects caused by the fluorgypsum, such as the decreased early compressive strength and the prolonged setting time. The effects of aluminum sulfate content and the quicklime/fluorgypsum ratio on the setting time, hydration heat, and compressive strength of the double liquid grouting materials were investigated, and the hydration products were characterized through thermogravimetry-differential thermal analysis (TG-DTA), X-ray Diffraction (XRD), and Scanning Electron Microscope (SEM) tests. The results show that the addition of aluminum sulfate can shorten the setting time and increase compressive strength at both early and later ages. Considering the setting time and compressive strength of double liquid grouting material at the same time, the optimum content of aluminum sulfate was found to be 2%, and the optimum ratio of quicklime/fluorgypsum was found to be 2:8. The values of the optimum content of aluminum sulfate and ratio of quicklime/fluorgypsum were verified from theoretical analysis.

Experimental Research on Fireproofing Measure of Beams Strengthened by Carbon Fiber Sheet Bonded with Inorganic Adhesive

2013 ◽  
Vol 477-478 ◽  
pp. 972-976
Author(s):  
Fu Xiong Wan
Keyword(s):  
High Temperature ◽  
Carbon Fiber ◽  
Steel Structure ◽  
Test Results ◽  
Damage State ◽  
Fire Temperature ◽  
Fiber Sheet ◽  
Fireproof Coating ◽  
In Fire ◽  
Carbon Fiber Sheet

Because of high temperature above 1000°C on fire, and Oxidation of carbon fiber at high temperature, fireproofing measure should be make to take advantage of the inorganic adhesive for beams strengthened by carbon fiber sheet bonded with the adhesive. The problem of which fireproofing material should be choose and how to make fireproofing measure needs to resolve. Fireproofing test is make for beams strengthened by carbon fiber sheet bonded with the adhesive protected by Thick-typed Fireproof Coating for steel structure (TFCSS) and Thick-typed Fireproof Coating for tunnel (TFCT). Typical damage state of the two typical coating is compared on and after fire, Temperature field of specimen is analyzed, and fireproofing effect is compared. The test results indicate that, under the protection of fireproof coating with proper structure, TFCT and TFCSS can supply effective fireproofing protection for carbon fiber sheet, but the former is inferior to the latter because the latter is easier to drop and crack in fire

FEDERALOY F-1

Alloy Digest ◽  
1954 ◽  
Vol 3 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Compressive Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Performance

Abstract Federaloy F-1 is a copper tin-zinc bearing bronze whose strength suits it for applications where loads are heavy. It should be used only where lubrication is exceptionally good or motion is of a rocking nature. It is also a good gear bronze. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness, creep, and deformation. It also includes information on high temperature performance and corrosion resistance as well as casting, machining, and joining. Filing Code: Cu-19. Producer or source: Federal-Mogul Corporation.

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