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Title	CHARACTERIZATION OF CRACKING RESTRAINT AT SAW-CUT JOINTS USING THE GERMAN CRACKING FRAME
Accession No	00936108
Authors	Vepakomma, S; Jeong, J-H; Zollinger, D G
Journal Title	Transportation Research Record No. 1813
Corp. Authors / Publisher	Transportation Research Board
Publication Date	20020000
Description	p. 28-35; Figures(13); Photos(2); References(11); Tables(1)
Languages	English
Abstract	Cracking of concrete slabs at saw-cut notches under a given combination of weather and slab conditions is a major concern in the early stages of construction. Several factors affect crack initiation such as material strength parameters, the method and quality of curing, slab-subbase stiffness, and concrete shrinkage and creep. Early-age creep and shrinkage also appear to be key factors in stress and crack development at the tip of the saw-cut notch. These two factors were analyzed and characterized by experiments that provide some insight relative to how shrinkage and creep strain affect crack development. These results can be useful in evaluating the behavior of concrete and the development of cracking at saw-cut notches. The German cracking frame was used to provide restraint and the means to initiate cracking at an artificial notch during early-age strength development in the concrete while the concrete was undergoing creep and shrinkage strains. The cracking frame tests were conducted under constant temperature and relative humidity conditions in the laboratory. A fracture mechanics approach was followed to determine concrete strength at the saw-cut notch. It can be concluded that the development of creep strain in the concrete affects the cracking tendency of the concrete. The data seemed to suggest that a greater cracking tendency at the saw-cut notches did not result until after the incremental creep strain in the concrete had diminished sufficiently. The role of creep and shrinkage under field conditions relative to the control of cracking due to saw cutting in newly constructed concrete slabs is also considered indirectly.
Supplemental Information	This paper appears in Transportation Research Record No. 1813, Construction 2002.
TRT Terms	Concrete pavements ; Cracking of concrete pavements ; Creep ; Fracture mechanics ; Laboratory tests ; Road construction ; Sawed joints ; Shrinkage ; Tensile strength ; Testing equipment
Other Terms	Cracking frame tests
Subject Areas	H32 CEMENT AND CONCRETE; H33 CONSTRUCTION; I32 Concrete; I52 Construction of Pavements and Surfacings
ISBN	0309077397
Availability	Transportation Research Board Business Office Find a library where document is available Order Document: http://worldcat.org/isbn/0309077397
URLs	Document: http://dx.doi.org/10.3141/1813-04
TRIS Files	HRIS
Database	TRIS Online