Effect of shrinkage and moisture content on the physical characteristics of blended cement mortars

The effects of drying on mortars containing Portland cement blended with fly ash or slag on the shrinkage, extent of surface cracking, pore size distribution as measured by mercury intrusion porosimetry, flexural strength, fracture toughness, and Young’s modulus are reported. Specimens were exposed...

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Bibliographic Details
Published in:Cement and concrete research 1998-10, Vol.28 (10), p.1467-1477
Main Authors: Kanna, V, Olson, R.A, Jennings, H.M
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Concretes. Mortars. Grouts
Exact sciences and technology
Materials
Properties and performance of fresh concrete
Properties and performance tests of mortar and hardened concrete
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Summary:The effects of drying on mortars containing Portland cement blended with fly ash or slag on the shrinkage, extent of surface cracking, pore size distribution as measured by mercury intrusion porosimetry, flexural strength, fracture toughness, and Young’s modulus are reported. Specimens were exposed to conditions of 100% relative humidity (RH), 50% RH, and/or oven-drying at 105°C. Drying coarsened the pore structure and increased the density of surface cracks, but surprisingly increased the flexural strength and the fracture toughness, and as anticipated lowered the Young’s modulus. This was regardless of the content of mineral admixture.
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(98)00120-3