The Structural Engineer > Archive > Volume 62 (1984) > Issues > Issue 16 > The Performance of Pretensioned Concrete Beams that Have Cracked Before Transfer of Prestress
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The Performance of Pretensioned Concrete Beams that Have Cracked Before Transfer of Prestress

Three standard M5 precast concrete bridge beams from a long line bed of five beams were rejected because of cracks that occurreduring manufacture. Subsequently, an extensive series of tests was carried out on the beams to investigate the effects of the early cracks on performance. It is concluded that, under certain circumstances, autogenous healing can restore the integrity of pre-tensioned beams so that service performance is not affected. A procedure for assessing the acceptability of such beams for incorporation in the permanent works is suggested. J.K. Green, P.J. Cookson and K.A.L. Johnson