Possibility of pore size distribution application to the description of air-entrained concrete porosity structure

• Autorzy: Wawrzeńczyk J. , Kozak W. , Kłak A.

Warianty tytułu

PL

Możliwość stosowania rozkładu wielkości porów do opisu parametrów struktury porowatości betonów napowietrzonych

• Języki publikacji: EN PL

Abstrakty

EN

Air void size and number distribution constitutes a major characteristic, which substantially contributes to building up concrete resistance to cyclic freezing and thawing. The standard pore spacing factor L is based on the Powers model. Due to the assumptions made in the model, it may not be able to represent the real structure of air pores in the concrete. Consequently, it is necessary to look for other methods to describe this structure. The sought model needs to account for variability in sizes of pore chords and pore random spacing in the paste. The paper analyses the distribution type and compares porosity characteristics obtained with measurements, and on the basis of the distribution. The analysis aims to assess if it is possible to substitute chords in the 0 to 400 μm range with their distribution. Another purpose of the analysis is to compare air pore structure parameters obtained by computations on raw data with the results received on the basis of pore size distribution for a given concrete.

Słowa kluczowe

EN

air-entrained concrete; air pore size distribution; log-normal distribution

PL

beton napowietrzony; rozkład wielkości porów powietrza; rozkład log-normalny

• Wydawca: Wydawnictwo Politechniki Świętokrzyskiej
• Czasopismo: Structure and Environment
• Rocznik: 2014
• Tom: Vol. 6, no. 1
• Strony: 5--12
• Opis fizyczny: Bibliogr. 14 poz., rys., tab., wykr., wzory

Twórcy

autor

Wawrzeńczyk J.

• Kielce University of Technology

autor

Kozak W.

• Kielce University of Technology

autor

Kłak A.

• Kielce University of Technology

Bibliografia

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• [7] Pigeon M., Pleau R., Durability of concrete in cold climates, E&FN SPON.
• [8] PN-EN 480-11 Determination of the characteristics of air pores in hardened concrete (in Polish), 2008.
• [9] Powers T.C., Air requirement of frost resistant concrete, Proceedings, Highway Research Board, V. 29, 1949, pp. 184-202.
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• [11] Springenschmidt R., Breitenbucher R., Setzer M.J., Air-entrained concrete - recent investigations on the fine sand composition. Waiting time before compaction and redosing of air-entraining agents, Betonwerk+Fertigteil-Technik, No. 11, 1987, pp. 742-748.
• [12] Table Curve 2D, SYSTAT.
• [13] Wawrzeńczyk J., Molendowska A., Use of microspheres as an alternative method of concrete air-entrainment (in Polish), Budownictwo - Technologie - Architektura, nr 4/2011, s. 51-55.
• [14] Yim H.J., Kim J.H., Lee B.Y., Kwak H.G., Air voids size distribution determined by ultrasonic attenuation, Construction and Building Materials 47 (2013), pp. 502-510.