Effects of Drying and Form and Shore Removal on Flexural Cracking in Beams and Slabs

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Title: Effects of Drying and Form and Shore Removal on Flexural Cracking in Beams and Slabs

Author(s): K. C. Hover

Publication: Special Publication

Volume: 107

Issue:

Appears on pages(s): 169-184

Keywords: beams (supports); concrete construction; concrete slabs; cracking (fracturing); drying; flexural strength; form removal; shoring; formwork (construction); Structural Research

Date: 6/1/1988

Abstract:
The development of flexural cracking in beams and slabs is discussed with particular reference to the incidence of cracking caused by the removal of formwork and shoring. Flexural cracking is shown to be distinct from, and only indirectly related to, structural capacity. The resistance to cracking is directly related to the modulus of rupture of the concrete, which is likewise indirectly related to the more commonly known compressive or "cylinder" strength of the concrete. Resistance to cracking is shown to decrease sharply during periods in which the surface of the concrete is drying, such as the period of time immediately following the removal of forms.