Shimizu Construction Co., Ltd.

Takeji Okada

Toru Kawai

Minoru Sawaide

Minoru Imai

Gaku Matsumoto

Daisuke Tachibana

A substantially water-resistant resin-coated aggregate for use in concrete includes a porous aggregate body, such as an artificial light weight aggregate, with an elastic layer made of a phenol resin elastomer deposited on the aggregate body, a rigid phenol resin coated on the elastic covered aggregate body. This resin-coated aggregate has a high water absorption prevention and further an external stress-damping function.

Resin-coated aggregates

A flowing concrete and a process of producing the same. A cement, water, aggregates, a superplasticizer and a segregation-controlling agent are kneaded into a base concrete having a water-cement ratio of about 35% or less, the segregation-controlling agent contained in an amount of about 0.02 to about 0.1 wt. %, based on the water and including a methylcellulose compound, and the superplasticizer contained in an amount of about 0.25 to about 0.6 wt. % based on the cement. Then, about 0.25 to about 0.6 wt. %, in terms of the solid, of a flowing agent based on the cement is added to the base concrete, the flowing agent including a sulfonic acid/formaldehyde high condensate and a polyvinyl alcohol. Further, the base concrete with the flowing agent is kneaded into the flowing concrete.

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Tokyo, Japan

Takeji Okada