01024603

Component

Manufactured sands are produced by crushing rock deposits to produce a fine aggregate which is generally more angular and has a rougher surface texture than naturally weathered sand particles. Aggregate that is more angular will, all else being equal, create a higher water demand in concrete. Manufactured sands can also contain significant quantities of rock dust. As natural sand deposits become depleted near some areas of metropolitan growth, the use of manufactured sands as a replacement fine aggregate in concrete is receiving increased attention. Designers, specifiers, contractors and material suppliers need to understand the effects of manufactured sand characteristics on concrete water demand and concrete durability, including the effects of inter-relationships between manufactured sand characteristics. As part of a comprehensive research program, manufactured sand properties and their effects on fresh concrete properties, mechanical properties and concrete durability were investigated. Concrete containing commercially available manufactured sands with a wide range of particle angularities and fines contents were included in the laboratory testing program. This paper summarizes the findings on hardened concrete properties including mechanical properties, permeability and freeze thaw durability. The properties of fresh concrete are discussed in a separate paper.

01020180

06-1494

English

20p

2006

Transportation Research Board 85th Annual Meeting

CD-ROM

Figures (5) ; References (27) ; Tables (1)

Angularity; Artificial aggregates; Concrete; Crushed rock; Durability; Fine aggregates; Mechanical properties; Sand; Sand deposits; Texture

Manufactured sands

Highways; Materials; I31: Bituminous Binders and Materials; I32: Concrete

Transportation Research Board Annual Meeting 2006 Paper #06-1494

TRIS, TRB

Mar 3 2006 10:42AM