Study of torsional response of modified reactive powder concrete beams containing coarse recycled aggregates, and reactive powder concrete beams at different cross-sections

This paper examines the torsional behavior of Beams made from Reactive Powder Concrete (RPC) at different cross-sections. It also examines the torsional behavior of modified reactive powder concrete (MRPC) beams that contain coarse aggregate and recycled coarse aggregate (at different replacements) with a maximum particle size of 9.5mm. The study examines the mechanical properties of modified reactive powder concrete in the fresh and hard states and the effect of replacement.

All modified reactive powder concrete beam mixes are cured in standard curing treatment conditions, and RPC beams are placed under a hot water curing bath with different cross sections (Solid Square, hollow, and deep rectangular). The modified reactive powder concrete group, modified reactive powder concrete beam at 30% replacement of coarse recycled aggregate, gives the highest torsion moment among the three replacements. A solid square beam gives better results than hollow cross-sections or beams with rectangular cross-sections, and the result shows that RPC beams under heat curing conditions provide better structural torsional strength than standard curing conditions.

Keywords: Modified reactive powder concrete, coarse recycled aggregate, torsion, ultra-high strength concrete, heat curing.

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