Suctions, fracture energy, and plastic cracking of cement mortar and concrete

Morris, PH and Dux, PF (2005) Suctions, fracture energy, and plastic cracking of cement mortar and concrete. Aci Materials Journal, 102 6: 390-396.

Author Morris, PH
Dux, PF
Title Suctions, fracture energy, and plastic cracking of cement mortar and concrete
Journal name Aci Materials Journal   Check publisher's open access policy
ISSN 0889-325X
ISBN 0889-325x
Publication date 2005-01-01
Sub-type Article (original research)
Volume 102
Issue 6
Start page 390
End page 396
Total pages 7
Editor Rebecca A Hartford
Place of publication USA
Publisher American Concrete Institute
Collection year 2005
Language eng
Subject C1
290800 Civil Engineering
680302 Cement and concrete materials
Abstract Plastic cracking of cement mortar and concrete is primarily attributable to desiccation by evaporation from unprotected surfaces. This causes high suctions (negative pressures) to develop in the pore water adjacent to these surfaces. Dissolved salts in the pore water can also contribute significantly to suctions. Quantitative expressions are available for all of the components of the total suction. The development of suctions over time is illustrated by the results of desiccation tests conducted on cement mortars, supplemented by data from the literature. It is shown that ambient conditions conducive to plastic cracking can arise almost anywhere, but that the extremely high suctions that develop in mature cement mortar and concrete do not imply that compression failures should occur A high value of fracture energy is derived from data from the desiccation tests that implies that plastic cracking is characterized by a significant zone of plastic straining or microcracking.
Keyword Construction & Building Technology
Materials Science, Multidisciplinary
Cement
Concrete
Fracture
Mortar
Plastic Cracking
Relative Humidity
Shrinkage Cracking
Soils
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 17:34:11 EST