| abstract |
[PROBLEMS] To easily and stably provide a concrete that satisfies the required performance of a design plan. SOLUTION: When producing concrete, at least one premix composition for blending concrete prepared by weighing by an automatic control means according to the required performance of concrete, cement, coarse aggregate, fine aggregate And the resulting premix composition slurry composition is weighed by mass with an automatic controller and kneaded with cement, coarse aggregate, water and chemical admixture. The premix composition slurry composition and cement, coarse aggregate, fine aggregate and water are kneaded in a concrete manufacturing factory. The premix composition slurry composition and the construction site arrival concrete are kneaded. [Selection] Figure 1 |