Effect of High Temperature on Compressive Strength and Microstructure of Cement Paste Modified by Micro- and Nano-calcium Carbonate Particles

This paper describes influence of exposure to high temperatures on material properties of cement paste with addition of fly ash. The properties of cement pastes are significant to the assumption behaviour of concrete and concrete structures. In the cement paste containing fly ash, the effect of high temperature up to 600 ° C causes the changes of content in physically bound water and the change in the material structure. The results of research indicate changes that are reflected in the material properties of the cement paste as compressive strength, tensile strength in bending.

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Changes in the Crystal Structure of Cement Mortars Subjected to a High Temperature

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.808.165 ◽

2019 ◽

Vol 808 ◽

pp. 165-171

Author(s):

Maria Ratajczak ◽

Michał Babiak ◽

Piotr Kulczewski

Keyword(s):

Crystal Structure ◽

Mechanical Properties ◽

Compressive Strength ◽

Phase Composition ◽

High Temperature ◽

Internal Structure ◽

Cement Paste ◽

Original Research ◽

Physical Parameters ◽

Cement Mortars

During the fire, structures of a building are exposed to the effect of a high temperature. As a result, the strength parameters and physical properties of concretes and cement mortars undergo change. Their range depends on the time and temperature of the fire. Describing the changes of the internal structure of concretes and mortars resulting from a fire is important in the fire diagnostics of the structures. The paper presents the results of an original research project, within which there was an attempt to relate changes in mechanical properties of the cement mortars with changes in the crystal structure of cement paste. For this purpose, the authors prepared cement prisms, which were heated at various temperatures that occur during a fire after 28 days of their curing. Then, the samples were subjected to compressive strength tests and tests of a structure and a phase composition using an electron scanning microscope. Scanning microscopy is a precious research method that allows observing surfaces of various materials with magnifications from x50 to even x1000000 at a very big sharpness depth. The tests conducted by the authors showed that the effect of fire and of the gradient of high temperatures on the executed samples causes the deterioration of the cement paste in the form of changes in physico-mechanical properties and in its internal structure. As the temperature increases, the compressive strength of the paste decreases gradually and proportionally. The SEM analysis also showed that the change in the physical parameters of the cement paste is reflected in its phase composition.

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Mechanical and Rheological Properties of Aluminous Cement under High Temperatures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.982.141 ◽

2014 ◽

Vol 982 ◽

pp. 141-144 ◽

Cited By ~ 3

Author(s):

Ondřej Holčapek ◽

Pavel Reiterman ◽

Petr Konvalinka

Keyword(s):

Tensile Strength ◽

Compressive Strength ◽

High Temperature ◽

Rheological Properties ◽

Cement Paste ◽

Rheological Behavior ◽

Experimental Program ◽

Before And After ◽

Aluminous Cement ◽

Strength In Bending

The following article deals with the relations between rheological behavior and strength characteristics of high aluminous cement paste. There were investigated the values of flow of fresh mixture (tested with Högermann ́s table), tensile strength in bending and compressive strength at the age of 28 days on specimens 40 x 40 x 160 mm. The influence of high temperature was examined by exposure to 600 °C and 1000 °C. The results of provided experimental program confirm the fact that with increasing water-cement ration decreases compressive and tensile strength before and after temperature loading. Also was shown the effect of high temperature on refractory aluminous cement paste properites.

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A method for measuring the in-plane compressive strength and the compression behavior of coating layers

TAPPI Journal ◽

10.32964/tj10.7.29 ◽

2011 ◽

Vol 10 (7) ◽

pp. 29-34

Author(s):

TEEMU PUHAKKA ◽

ISKO KAJANTO ◽

NINA PYKÄLÄINEN

Keyword(s):

Tensile Strength ◽

Compressive Strength ◽

Calcium Carbonate ◽

Coating Layer ◽

Test Methods ◽

Coating Films ◽

Precipitated Calcium Carbonate ◽

Coating Color ◽

Mineral Coatings ◽

Styrene Butadiene

Cracking at the fold is a quality defect sometimes observed in coated paper and board. Although tensile and compressive stresses occur during folding, test methods to measure the compressive strength of a coating have not been available. Our objective was to develop a method to measure the compressive strength of a coating layer and to investigate how different mineral coatings behave under compression. We used the short-span compressive strength test (SCT) to measure the in-plane compressive strength of a free coating layer. Unsupported free coating films were prepared for the measurements. Results indicate that the SCT method was suitable for measuring the in-plane compressive strength of a coating layer. Coating color formulations containing different kaolin and calcium carbonate minerals were used to study the effect of pigment particles’ shape on the compressive and tensile strengths of coatings. Latices having two different glass transition temperatures were used. Results showed that pigment particle shape influenced the strength of a coating layer. Platy clay gave better strength than spherical or needle-shaped carbonate pigments. Compressive and tensile strength decreased as a function of the amount of calcium carbonate in the coating color, particularly with precipitated calcium carbonate. We also assessed the influence of styrene-butadiene binder on the compressive strength of the coating layer, which increased with the binder level. The compressive strength of the coating layer was about three times the tensile strength.

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FEDERALOY F-1

Alloy Digest ◽

10.31399/asm.ad.cu0019 ◽

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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DURALCAN F3S.xxS

Alloy Digest ◽

10.31399/asm.ad.al0329 ◽

1994 ◽

Vol 43 (10) ◽

Keyword(s):

Fracture Toughness ◽

Silicon Carbide ◽

Compressive Strength ◽

Aluminum Alloy ◽

High Temperature ◽

Base Alloy ◽

Alloy Matrix ◽

Reinforced Composite ◽

Temperature Performance ◽

Aluminum Alloy Matrix

Abstract Duralcan F3S.xxS is a heat treatable aluminum alloy-matrix gravity composite. The base alloy is similar to Aluminum 359 (Alloy Digest Al-188, July 1969); the discontinuously reinforced composite is silicon carbide. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness and fatigue. It also includes information on high temperature performance. Filing Code: AL-329. Producer or source: Alcan Aluminum Corporation.

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FLYLITE ZRE-1

Alloy Digest ◽

10.31399/asm.ad.mg0002 ◽

1952 ◽

Vol 1 (2) ◽

Keyword(s):

Compressive Strength ◽

High Temperature ◽

Physical Properties ◽

Tensile Properties ◽

Base Alloy ◽

Heat Treating ◽

Jet Engine ◽

Temperature Performance ◽

Engine Components ◽

Temperature Applications

Abstract Flylite ZRE-1 is a creep resistant magnesium-base alloy primarily designed for jet engine components and other high temperature applications. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as creep. It also includes information on high temperature performance as well as casting, heat treating, machining, and joining. Filing Code: Mg-2. Producer or source: Howard Foundry Company.

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STOODY 4

Alloy Digest ◽

10.31399/asm.ad.co0075 ◽

1977 ◽

Vol 26 (4) ◽

Keyword(s):

Solid Solution ◽

Compressive Strength ◽

Corrosion Resistance ◽

High Temperature ◽

Physical Properties ◽

Heat Treating ◽

Tungsten Alloy ◽

High Temperature Strength ◽

Cobalt Chromium ◽

Temperature Performance

Abstract STOODY 4 is a cobalt-chromium-tungsten alloy with excellent high-temperature strength and excellent resistance to corrosion. This alloy derives its high-temperature strength from the high tungsten-to-carbon ratio which allows a large percentage of tungsten to remain in solid solution. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength. It also includes information on high temperature performance and corrosion resistance as well as heat treating, machining, and joining. Filing Code: Co-75. Producer or source: WRAP Division, Stoody Company.

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