To obtain lightweight concrete improved in lightness, strength, and resistance to freezing and thawing by blending a water reducing agent excellent in dispersibility in aggregate and various kinds of additives with a composition containing cement, water and lightweight aggregate partially or entirely dried.
This lightweight concrete is obtained by blending a water reducing agent excellent in dispersibility in aggregate and various kinds of additives with a composition containing cement, water, lightweight aggregate and aggregate. The lightweight aggregate comprises fine aggregate and coarse aggregate, and it is permissible that one of them is wet and the other is in bone dry but the total water absorption of both aggregates is pref. ≤50%. When part or the whole of lightweight aggregate has ≤1.0 specific gravity, the composition becomes further lighter. The ratio of water to cement is pref. ≤55%. The water reducing agent is pref. polycarboxylic acid-based and e.g. a polycarboxylic acid ether-based complex (Ca base) or the like. The content of the water reducing agent is pref. ca. 0.6-9.0 L/1 m3. When a foaming agent as an additive is included in concrete so as to include bubbles in the concrete, it is possible to improve lightness, and resistance to freezing and thawing.
YOSHITOMI EITARO
NAKAMURA MASAHIRO
KUWAMOTO TAKU
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