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Fatigue and Static Tests of Steel Strand Prestressed Beams of Expanded Shale Concrete and Conventional Concrete

• ID:

  904

• ESCSI:

  4324.005

• Author:

  Nordby, Gene and William Venuti

• Publication Name:

  Journal

• Type of Publication:

  Article

• Publisher:

  American Concrete Institute

• Dated:

  1957

• Issue/Volume:

  August

• Other ID:

• Page(s):

  141-160

• Reference List:

  Y

• Abstract:

  Tests on 27 beams cast from conventional and expanded shale aggregate concrete, prestressed with steel strand, are discussed. Fatigue tests at various load ranges and number of cycles of load repetition were performed on matched beams manufactured from both aggregates. Steel fatigue failures occurred in three specimens while the other 24 beams performed satisfactorily under fatigue loading. The three fatigue failures occurred when the beams were severely cracked during the repetitive loading; this failure was a result of stress concentrations and abrasion between the strands and the concrete. Those specimens undamaged by the fatigue loading were tested statically to failure, and either flexure or bond failures were recorded. The bond failures indicated that embedment length was the governing factor against failure rather than bond stress as computed from conventional equations.