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- W2278860669 abstract "The air-void size distribution and number of air voids are crucial characteristics of air-entrainment. The standard spacing factor L is based on the Powers model, in which considerable simplifications are assumed. A better solution is provided by the Philleo factor, which determines the percentage content of protected paste located at a distance S from the edge of the nearest air void. Developing the concept put forward by Philleo, a method of determining the volume of protected paste on the basis of images generated from the numerical model of concrete grain structure including layout of aggregate-paste-air, is proposed. It is the ratio of the volume of the paste protected by air voids to the total paste volume. The PPV (protected paste volume) index accounts not only for sizes and number of air voids, but also for the role of aggregate particles in the placement of these pores, which is often disregarded in analyses. The PPV results obtained from image analysis were compared with standard spacing factor L and with the parameter developed by Philleo. The analyses conducted by the authors shows that accounting for aggregate grains in calculations substantially affects the assessment of the quality of the air-pore structure. micropores greater than 1.5%. Air-entrainment technology involves introducing a surfactant into the concrete mix. When the components are mixed, the air-entraining agent makes it possible to form and evenly disperse small air bubbles in the concrete. The system of small air voids protects concrete from damage caused by an increase in the volume of freezing water. Appropriate spacing of air voids in hardened cement paste significantly reduces the distance to be travelled by water that is not frozen yet, from a random point inside the hardened cement paste to the nearest air void (3). To ensure freeze-thaw resistance, it is essential to provide a time-stable system of small air bubbles, which are located close enough to one another, at the lowest possible total air content. In modern concrete technology, simultaneous usage of cement, additives and admixtures often cause problems related to obtaining the time-stable pore system. The effects of air-entrainment may differ due to the action of many factors, including the mix consistency and temperature, mixing time, transport" @default.
- W2278860669 created "2016-06-24" @default.
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- W2278860669 date "2015-01-01" @default.
- W2278860669 modified "2023-09-27" @default.
- W2278860669 title "A Method of Assessing Parameters of Air-Void Structure in Air-Entrained Concretes" @default.
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