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Titolo:
Effects of water-cement ratio, curing age, silica fume, polymer admixtures, steel surface treatments, and corrosion on bond between concrete and steel reinforcing bars
Autore:
Fu, XL; Chung, DDL;
Indirizzi:
SUNY Buffalo, Dept Mech & Aerosp Engn, Buffalo, NY 14260 USA SUNY BuffaloBuffalo NY USA 14260 ch & Aerosp Engn, Buffalo, NY 14260 USA SUNY Buffalo, Composite Mat Res Lab, Buffalo, NY 14260 USA SUNY Buffalo Buffalo NY USA 14260 site Mat Res Lab, Buffalo, NY 14260 USA
Titolo Testata:
ACI MATERIALS JOURNAL
fascicolo: 6, volume: 95, anno: 1998,
pagine: 725 - 734
SICI:
0889-325X(199811/12)95:6<725:EOWRCA>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTACT ELECTRICAL-RESISTIVITY; CARBON-FIBER; MECHANICAL-PROPERTIES; PULL-OUT; STRENGTH; REBAR; METHYLCELLULOSE;
Keywords:
abrasive blasting; bond; cement; concrete; curing age; plastics; polymers and resins;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Fu, XL SUNY Buffalo, Dept Mech & Aerosp Engn, Buffalo, NY 14260 USA SUNY Buffalo Buffalo NY USA 14260 rosp Engn, Buffalo, NY 14260 USA
Citazione:
X.L. Fu e D.D.L. Chung, "Effects of water-cement ratio, curing age, silica fume, polymer admixtures, steel surface treatments, and corrosion on bond between concrete and steel reinforcing bars", ACI MATER J, 95(6), 1998, pp. 725-734

Abstract

The bond between concrete and steel reinforcing bars was evaluated by electromechanical pull-out testing that involved measuring the shear bond strength and contact electrical resistivity of each sample. The bond strength was increased by steel reinforcing bar surface treatment (acetone, water, ozone, or sandblasting, with ozone treatment being the most effective and acetone treatment being the least effective), adding silica fume and polymer tothe concrete, an increase in the water-cement ratio of concrete (particularly from 0.45 to 0.50), and a decrease in the curing age (particularly from14 to 7 days). The origins of these effects are reinforcing bar cleansing for acetone treatment (accompanied, by a decrease in contact resistivity), reinforcing bar surface oxide film formation for water and ozone treatments(accompanied by increases in contact resistivity), reinforcing bar surfaceroughening for for sandblasting, polymer interface layer formation for theaddition of polymer (accompanied by an increase in contact resistivity forthe addition of latex, but not for the addition of methylcellulose), a decrease interfacial void content (accompanied by a decrease in contact resistivity) for an increase in the water-cement ratio (due to an increase in fluidity) and for a decrease in the curing age (due to a decrease in shrinkage), and an increase in the matrix modulus for the addition of silica fume. Corrosion initially caused the bond strength to increase while the contact resistivity increased, but further corrosion caused the bond strength to decrease while the contact resistivity continued to increase.

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Documento generato il 02/12/20 alle ore 07:46:08