Abstract
The key to the development of a reliable concrete production system and stabilization of batch qualities lies in accurate scaling and adjustment of the quantities of each ingredient. Changing surface moisture of sand has the greatest influence on concrete quality fluctuation, and it is difficult to precisely evaluate sand surface moisture with the present production system. To solve this problem, the authors have devised an “immersion batching” method for fine aggregate, in which aggregate is immersed in water before being batched in a wet condition. This paper shows the practical equipments of this new batching method, which applied to the concrete mixing batching plant for dam concrete on site, and the results of quality confirmation tests on concrete made using this method are reported.
