ARTIFICIAL LIGHTWEIGHT FINE AGGREGATE AND ITS PRODUCTION AND MORTAR CONCRETE USING THE SAME

摘要

PURPOSE: To obtain a fine aggregate improved in adhesivity to matrix, low cost and mass productivity, and capable of giving mortar concrete with higher mechanical strength, by baking a material consisting mainly of volcanic vitreous minerals. ;CONSTITUTION: A material consisting mainly of volcanic vitreous minerals is first ground to ≤50μm in average particle diameter, and incorporated with a foaming agent and caking agent followed by conducting a granulation into granules ≥5mm in diameter, which are, in turn, baked at 1000-1300°C. Subsequently, the resultant granules are ground mainly through impact grinding among the granules and subjected to sharpness removal and granular size adjustment, thus obtaining the objective fine aggregate 0.4-1.0 in specific gravity, ≤10.0wt.% in water absorption and ≥60wt.% in yield. The aggregate with the rupture surface of honeycomb pattern is high in adhesive force to cement paste, leading to markedly improving the tensile strength and flexural strength of mortar concrete cured bodies incorporated with the aggregate.;COPYRIGHT: (C)1996,JPO