GRANULE FOR CIVIL ENGINEERING USE USING DEHYDRATED CAKE AS BY-PRODUCT IN WATER PURIFICATION PLANT AND CRUSHED STONE POWDER AND PREPARATION METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To achieve granules for civil engineering use having strength equivalent to that of a subgrade material and being fully utilizable as a backfill material or the like and to achieve a preparation method thereof by using dehydrated cake from a water purification plant and a crushed stone powder.

SOLUTION: The granules for civil engineering use which are fully utilizable as a backfilling material or the like are produced by feeding dehydrated cake as a by-product in a water purification plant and a crushed stone powder into a granulator 7 having a rotary vane 8, disintegrating them by rotating the rotary vane at a high speed, and adding blast furnace slag cement type B and water to the granulator and rotating the rotary vane at a low speed to effect granulation. It is desirable in this case that the mixing is performed under conditions in which the ratio of the dehydrated cake added is 70±20 mass% and the ratio of the crushed stone powder added is 30±20 mass% so as to make 100 mass% mixture, and the external proportion of the blast furnace slag cement type B blended is 5-10 mass%.

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