STUDY ON MEASUREMENT METHOD OF WATER CONTENT IN CONCRETE WITH AIR CONTENT AND DENSITY OF CONCRETE MIXTURE

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  • 単位容積質量と空気量からフレッシュコンクリートの単位水量を算定する方法に関する研究
  • タンイ ヨウセキ シツリョウ ト クウキリョウ カラ フレッシュコンクリート ノ タンイ スイリョウ オ サンテイ スル ホウホウ ニ カンスル ケンキュウ

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Water content is a critical parameter strongly affecting the durability of concrete structures. Therefore, a simple and accurate measurement is desired for quality inspection of as-delivered concrete. This paper describes a calculating method of water content of fresh concrete with the density and air content measurements. The fluctuation of material densities and the measurement error of air content were found to strongly affect the calculation results. However, the water content could be calculated with an accuracy of ±2kg/m3 by precisely measuring the air content and acculately determining the density of concrete. With a measuring time of 5 minutes, the proposed method was proven highly applicable to field measurement of water content of concrete.

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