Clay content of artificial sand for hydratable cementitious composition

摘要

This invention processes the artificial sand particle extra with the poly- cation which eases the influence of the clay, in order the natural sand particle for 90% to be kept at least on 75 micron sieves, offers the manufacturing method of the sand composition which is combined with the natural sand particle which was washed in order to remove the fines. Method of this invention is processed, for producing the concrete, extra and also use of the sand which is combined includes, with that method the cement, the porikarubokishireto type dispersant and the poly- cation chemical compound which eases the influence of the clay of the further quantity and at least combines the sand with hydroxyl of 1 kinds or hydroxyl carboxylic acid or salt chemical compound. Selective figure Figure 2