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Pore structure of plain cement pastes hydrated at

Pore structure of plain cement pastes hydrated at

Pore structure of plain cement pastes hydrated at ...

1990-11-1  Concrete outside the laboratory cures at temperatures other than 20°C. This paper describes an investigation of the pore structure of plain cement pastes hydrated at 5°, 20°, and 50°C to reflect a range of temperatures encountered in practice. Parallel specimens of 0.50 water/cement ratio pastes were examined using mercury intrusion ...

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Pore structure of plain cement pastes hydrated at ...

Concrete outside the laboratory cures at temperatures other than 20°C. This paper describes an investigation of the pore structure of plain cement pastes hydrated at 5°, 20°, and 50°C to reflect a range of temperatures encountered in practice.

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Development of microstructures in plain cement pastes ...

1991-1-1  This paper describes an examination of the developing microstructure of cement pastes hydrated at 5–50°C. In accordance with the indirect evidence developed previously, the investigation shows that low curing temperatures result in a uniform distribution of hydration products, while elevated temperatures result in a coarsened pore structure.

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The pore structure of paste in concrete - ScienceDirect

1990-3-1  The pore size distribution of the cement paste that develops in concrete and mortar was measured by mercury intrusion. The intruded pore volumes were expressed on a per unit mass of paste basis and compared with the pore structure of plain paste that hydrated without aggregate.

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DEVELOPMENT OF MICROSTRUCTURES IN PLAIN CEMENT

This paper describes an examination of the developing microstructure of cement pastes hydrated at 5-50 deg C. In accordance with the indirect evidence developed previously, the investigation shows that low curing temperatures result in a uniform distribution of hydration products, while elevated temperatures result in a coarsened pore structure.

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Pore structure of hydrating cement paste by magnetic ...

1996-1-1  The pore structure evolution has been studied by the suppression of the freezing temperature of water and compared with spin-spin relaxation analysis performed at room temperature. Both methods consistently show that hydrating cement pastes have two principal components in their size distribution.

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PORE STRUCTURE DEVELOPMENT IN PORTLAND

that the blended cement pastes generally had higher total porosity than plain cement pastes. The major contribution to this increase in porosity was in the form of smaller pore sizes. With reactive fly ash at 20% replacement, the pore structure of mature paste consists mainly of pores nominally smaller than

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Pore structure in blended cement pastes - DTU Byg

2013-2-12  Cement pastes (w/b=0.4) with and without slag and fly ash cured at two moisture (sealed and saturated) and temperature (20 and 55ºC) conditions were used to investigate the combined impact of SCMs addition and curing on the pore structure of pastes cured up to two years. Also, the porosity measurements were compared with porosity modelling.

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(PDF) Curing, Hydration, and Microstructure of Cement Paste

Small pieces of the hydrated cement pastes were also u sed in the LTC experiments. 158 Sample mass was typically between 30 mg (0.001 oz.) and 90 mg (0.003 oz.).

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Pore Structure of Concrete - Purdue University

2020-10-13  schoolof civilengineering indiana departmentofhighways jointhighwayresearchproject fhwa/in/jhrp-86/13 finalreport theporestructureofconcrete dingliu douglasn.winslow g£s university

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Pore structure of hydrating cement paste by magnetic ...

1996-1-1  The pore structure evolution has been studied by the suppression of the freezing temperature of water and compared with spin-spin relaxation analysis performed at room temperature. Both methods consistently show that hydrating cement pastes have two principal components in their size distribution.

get price

DEVELOPMENT OF MICROSTRUCTURES IN PLAIN CEMENT

This paper describes an examination of the developing microstructure of cement pastes hydrated at 5-50 deg C. In accordance with the indirect evidence developed previously, the investigation shows that low curing temperatures result in a uniform distribution of hydration products, while elevated temperatures result in a coarsened pore structure.

get price

Pore structure in blended cement pastes — Welcome to

Cement pastes (w/b=0.4) with and without slag and fly ash cured at two moisture (sealed and saturated) and temperature (20 and 55ºC) conditions were used to investigate the combined impact of SCMs addition and curing on the pore structure of pastes cured up to two years. Also, the porosity measurements were compared with porosity modelling.

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Hydration and multiscale pore structure characterization ...

The pore structure of cement pastes incorporating fly-ash was evaluated during their hydration process through gravimetry method, mercury intrusion porosimetry (MIP) and nitrogen adsorption ...

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Hydration phase and pore structure evolution of hardened ...

2021-7-25  Pore structure and chloride permeability of concrete containing nano-particles (TiO2 and SiO2) for pavement are experimentally studied and compared with that of plain concrete, concrete

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Realistic pore structure of Portland cement paste ...

Realistic pore structure of Portland cement paste: experimental ... Cement pastes with w/c=0.3, 0.4 and 0.5 at ages from 1 day to 120 days are ... representation of the pore structure of hydrated ...

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PORE STRUCTURE DEVELOPMENT IN PORTLAND

that the blended cement pastes generally had higher total porosity than plain cement pastes. The major contribution to this increase in porosity was in the form of smaller pore sizes. With reactive fly ash at 20% replacement, the pore structure of mature paste consists mainly of pores nominally smaller than

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The pore structure of cement paste blended with fly ash ...

The injection of water at 1 month to simulate internal curing evidently affected pore structure of cement paste having 40% replacement with fly ash, decreasing volume of capillary pores by 6.0-42 ...

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Correlation between pore structure and low-temperature ...

The pore structure and low-temperature dilatation behavior of traditional hydrated Portland cement paste compacted by different methods were investigated. The aim of the investigation was to demonstrate the influence of the water-cement ratio and the compacting conditions on the developing pore structure and the frost dilatation during the early stage of the hydration process. A low water ...

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Blended pastes of cement and lime: pore structure and ...

2020-3-4  The purpose of this paper is to evaluate the pore structure in different blended pastes, regarding their composition, using the fractal geometry, and also the capillary sorption as a relevant hygrometric property. 2. Experimental work 2.1. Pastes preparation A hydrated commercial lime powder (Ecobat®) (supplied by Calinsa S.A, Navarra, of

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Pore structure of hydrating cement paste by magnetic ...

1996-1-1  The pore structure evolution has been studied by the suppression of the freezing temperature of water and compared with spin-spin relaxation analysis performed at room temperature. Both methods consistently show that hydrating cement pastes have two principal components in their size distribution.

get price

Hydration and multiscale pore structure characterization ...

The pore structure of cement pastes incorporating fly-ash was evaluated during their hydration process through gravimetry method, mercury intrusion porosimetry (MIP) and nitrogen adsorption ...

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Realistic pore structure of Portland cement paste ...

Realistic pore structure of Portland cement paste: experimental ... Cement pastes with w/c=0.3, 0.4 and 0.5 at ages from 1 day to 120 days are ... representation of the pore structure of hydrated ...

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Pore Structure Of Cement Based Materials Testing ...

2021-9-6  pore-structure-of-cement-based-materials-testing-interpretation-and-requirements-modern-concrete-technology 1/8 ... Hydrated cement is a cement material bonded together with water and used ... pore structure of such cement pastes plays an important role during hydration and, ultimately, durability.In this work, the pore structures of ...

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The pore structure of cement paste blended with fly ash ...

The injection of water at 1 month to simulate internal curing evidently affected pore structure of cement paste having 40% replacement with fly ash, decreasing volume of capillary pores by 6.0-42 ...

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(PDF) Porosity and Pore Size Distribution of Well Hydrated ...

the structure, properties and behaviour of Porosity and Pore Size Distribution of Cement-Fly blended cements, 8th International Congress on Ash-Gypsum Blended Pastes. Journal of Advances the Chemistry of Cement, Rio De Janeiro, Brazil, in Applied Ceramics, Structural, Functional and 1: 233-248.

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Pore size distribution of hydrated cement pastes modified ...

Mercury intrusion porosimetry (MIP) tests were performed on pure and polymer-modified cement pastes in order to evaluate the influence of hydroxyethyl cellulose (HEC polymer) and vinyl acetate/ethylene copolymer (EVA) on the pore size distribution. Cement pastes containing 0%, 10%, and 20% of EVA and 0%, 0.5%, and 1.0% of HEC of the weight of cement were prepared and the water/cement ratio was ...

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Blended pastes of cement and lime: pore structure and ...

2020-3-4  The purpose of this paper is to evaluate the pore structure in different blended pastes, regarding their composition, using the fractal geometry, and also the capillary sorption as a relevant hygrometric property. 2. Experimental work 2.1. Pastes preparation A hydrated commercial lime powder (Ecobat®) (supplied by Calinsa S.A, Navarra, of

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A method for predicting the alkali concentrations in pore ...

linity of the pore solution remarkably [5, 6], of which the mechanisms are not completely revealed. The C–S–H gel in hydrated slag cement pastes has remarkably lower calcium to silicate (C/S) ratios than that in Portland cement paste and incorporates more aluminum in its structure [7], which probably possesses enhanced alkali-binding capaci-

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(PDF) Hydration, shrinkage, pore structure and fractal ...

Hydration, shrinkage, pore structure and fractal dimension of silica fume modified low heat Portland cement-based materials February 2021 Construction and Building Materials 272(8):121952

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