Publikacje

Abstract:

The concrete air pore structure quality evaluation is conducted according to the EN 480-11 standard One of the basic parameters required for the concrete air pore structure quality evaluation is the P/A (paste/air) ratio. In practice, the paste's volume is determined based on the concrete mixture composition. In actual conditions, fluctuations in the air content can be observed, which directly affect the concrete composition and thus the P/A ratio, thereby ultimately affecting the results of the spacing factor (L) over bar The aim of these studies was to determine the impact of various air contents and concrete mixture component proportions on the air pore structure parameters. The testing concerned surface concrete with the air content of approx. 5% and paste volume of P=26%. Standard tests for three samples with the air content fluctuating from 3.58 to 7.98% were conducted. The second stage of testing included 2D measurements of samples with the use of an innovative method of sample lighting, which allowed determining the contents of particular phases (aggregate, air, paste). The results of the standard tests were compared with the results obtained from the 2D analysis. It was found that the use of the 1D and 2D analyses leads to the determination of the values of the spacing factor amounting from 0.003 to 0.016 mm.

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2D Analysis of Concrete Composition in the Context of Determining Air Pore Structure Parameters