Compaction Effects on Flexural Behavior of Fiber Reinforced Concrete


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Title: Compaction Effects on Flexural Behavior of Fiber Reinforced Concrete

Author(s): Mitsuyasu MashimaI

Publication: Special Publication

Volume: 96


Appears on pages(s): 197-214

Keywords: compacting; fiber reinforced concretes; flexural strength; glass fibers; metal fibers; plain concrete; workability; Materials Research

Date: 1/1/1987

Fiber reinforced concrete is reinforced by a small amount of short fibers randomly dispersed into cement concrete, and this composite material is superior to normal plain concrete, with respect to flexural strength, impact resistance, and ductility. But the consistency of fiber reinforced concrete is extremely decreased by adding fiber so that, in some cases, it becomes difficult to place and mold by the ordinary method. These phenomena are observed irrespective of kinds of fibers used. The effects of compaction methods on the strength of fiber reinforced concrete with poor consistency and containing a fairly large amount of fibers were investigated. Conventional steel fiber and alkali-resistant glass fiber were used. Test specimens (10 x 10 x 60 cm) of plain and fiber reinforced concretes were compacted by external vibration with temporary or continuous compressive loading, and were tested in flexure. The mechanism of compaction effects was discussed. Test results indicate that the compaction with compressive loading increases the flexural strength of both types of fiber reinforced concretes and also does extensibility of glass fiber reinforced concrete, although the improvement is made within a certain limit of compaction loading.