1887

n Journal of the South African Institution of Civil Engineers - Cold-twisting high-tensile reinforcing steel for ductile reinforced concrete : technical note

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Abstract

Tradisioneel word weekstaal versterk vir gebruik as wapening vir beton deur die stawe om hul lengte-as te verwring. Hierdie versterkingsproses gaan gepaard met 'n verlies aan rekbaarheid. Toetsresultate toon dat 'n stel warmgewalste trekvaste wapeningstawe wat koud vervorm is, 'n verhoogde vervorming-versterkingsgradient ontwikkel oor die gebied waarin vervorming-versterking die rekbaarheid van gewapende betonelemente ten opsigte van buigsterkte verbeter. Twee tegnieke om die koudvervorming te bewerkstellig (wring en rek) is ondersoek en 'n verklaring van die metallurgiese mikrostruktuurveranderings is voorgestel. Die resultate van die toets van agt gewapende betonbalke waarin sulke vervormde staal stawe gebruik is, word gemeld.

Traditionally mild steel bars have been strengthened for use as reinforcement for concrete by twisting them about their longitudinal axes. This strengthening is accompanied by some loss in ductility. Test results reported here show that a batch of hot-rolled high-tensile reinforcing bars that were cold-worked exhibited a superior strain-strengthening gradient over the region where strain-strengthening may enhance ductility in a reinforced concrete element in bending. Two methods of cold-working the steel (twisting and stretching) were investigated and an explanation of the changes in the metallurgical microstructure is presented. The results of eight reinforced concrete beam tests, reinforced with some of these cold-worked specimens, are also presented.

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/content/civileng1/35/4/EJC26718
1993-01-01
2016-12-09
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