engleski

Possible Acceptance of Small Recycled Aggregate Fractions for Concrete Production

In western region of Croatia, small fractions of recycled aggregate have similar properties like small fractions of crushed natural aggregate regarding grain shape and fines content. The focus of this research was to analyze possibilities of using small fractions of recycled aggregate in the cases where only poor quality natural sand is available for production of concrete. The research is based on available data from concrete production in wider region of western Croatia and also on experimental research carried out on several series of mortar samples prepared with recycled and natural fine aggregate. Influence of two-phase mixing method on mortar properties in fresh and hardened state was analyzed. Based on the results of testing, it is concluded that small recycled concrete aggregate may be suitable for use in the concrete production. In concrete mix design, it is recommended to decrease absolute aggregate absorption determined according to HRN EN 1097 and to use double mixing method, due to its positive effect on the consistency and strength.

recycled concrete; recycled sand; absorption; double mixing method; consistency; fine particles; water requirement

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