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混凝土配合比设计的砂子以干砂为准,但实际施工中使用的砂子一般都含有不同程度的水分。因此,在配制混凝土前,必须预先测定砂子的含水率,才能确保按设计配合比配制出合乎要求的混凝土。因此研制并推广应用砂子含水率测定仪具有重要的现实意义。当前国内外进行了不少研究工作。研制仪器所依据的原理,有的是借助于砂中水与化学物质的作用,来测定反应产物的化学法;有的是依据砂中水
The sand of the concrete mix design is based on dry sand, but the sand used in the actual construction generally contains different levels of moisture. Therefore, before the preparation of concrete, the moisture content of the sand must be determined in advance to ensure that the desired concrete is formulated according to the design mix ratio. Therefore, it is of great practical significance to develop and promote the application of the sand moisture detector. There are a lot of research work at home and abroad. The principle behind the development of the instrument is based on the chemical method of measuring the reaction product by the action of water and chemical substances in the sand; some are based on the water in the sand.