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Title: Influence of mix proportions and Construction Operations on Plastic Shrinkage Cracking in Thin Slabs

Author(s): Christos A. Shaeles and Kenneth C. Hover

Publication: Materials Journal

Volume: 85

Issue: 6

Appears on pages(s): 495-504

Keywords: concrete construction; concrete slabs; cracking (fracturing); drying; evaporation; finishing; hot weather construction; plastic shrinkage; mix proportioning; mortars (material); shrinkage; Materials Research

DOI: 10.14359/2242

Date: 11/1/1988

Abstract:
Plastic shrinkage cracking in mortar panels, simulating cracking in concrete slabs, was investigated using the procedure developed by Kraai. For the specific conditions of the testing program, the incidence of plastic shrinkage cracking increased with the paste volume fraction. It was also observed that the orientation and severity of the cracks were influenced more strongly by the other direction and speed of strike-off operations than for all other variables studied. While it is believed that some threshold evaporation rate is necessary to initiate cracking, for the tests conducted there was no direct correlation between the severity of the cracking and the rate of evaporation.