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Title	STRESS RELAXATION PHENOMENA AT EARLY TECHNOLOGICAL PHASES OF GAS-CONCRETE
Accession No	00767851
Authors	Lapsa, V A
Journal Title	ACI Materials Journal Vol. 96 No. 4
Corp. Authors / Publisher	American Concrete Institute
Publication Date	19990700
Description	p. 436-439; Figures(5); References(5)
Languages	English
Abstract	This paper is an attempt to develop a rheological explanation of the mechanics of creating qualitative or nonqualitative (cracked or uncracked) porous structure in the process of hydrogen foaming of gas-concrete slurry. For this goal, the simplest rheological model of similar mortar-type slurries, the Bingham's model, was used. The foaming process and the process of technological deformation of gas-concrete slurry were approximated by a simple exponential equation. By solving the Bingham's model equation in the previously mentioned manner of deformation and taking into account the decreasing horizontal section of the cell walls, the theoretical kinetics of increase and relaxation for the tensile stresses in the cell walls during the foaming process were estimated. A comparison of the model to experimentally measured stresses was carried out, and the coincidence as well as some disagreements were discussed. The causes of noncoincidence are suggested. For more exact stress calculation in the previously mentioned foaming process, the conception must be more complicated. This work is the first approximation for this purpose.
TRT Terms	Cracking ; Foaming agents ; Gas permeability (Concrete) ; Hydrogen ; Kinetics ; Rheology ; Slurry ; Tensile properties
Subject Areas	H32 CEMENT AND CONCRETE; I32 Concrete
Contract Number	CMS-9796326
Availability	American Concrete Institute Find a library where document is available Order Document: http://worldcat.org/oclc/13846872
URLs	Document: http://www.aci-int.org/PUBS/JOURNALS/AbstractDetails.asp?srchtype=phrase&date=anytime&searchmonth=7&searchday=0&searchyear=1999&publication=Materials+Journal&volume=96&issue=4&title=STRESS+RELAXATION+PHENOMENA+AT+EARLY+TECHNOLOGICAL+PHASES+OF+GAS%2DCONCR&I
TRIS Files	HRIS
Database	TRIS Online

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