http://worldcat.org/entity/work/id/33309790

Degradation of normal portland and slag cement concrete under load, due to reinforcement corrosion

The majority of studies published on concrete-steel corrosion have been conducted on unstressed specimens, although structural concrete is subjected to substantial strain near the steel reinforcing bars that resist tensile loads, resulting in a series of microcracks. This report presents the initial results of an investigation to determine the effect of applied load and microcracking on the rate of ingress of chloride ion and corrosion of steel in concrete. Simple-supported concrete beam specimens were loaded to give maximum strain of about 600 ue on the tension face. Chloride ion ingress on cores taken from loaded specimens was monitored using energy-dispersive X-ray analysis techniques. Corrosion current and rate measurements using linear polarization electrochemical techniques were also obtained on the same loaded specimens. Variables investigated included two concrete types, two steel cover-depths, three applied load levels, bonded and unbonded rebars, and the exposure of tension and compression beam faces to chloride solution. One concrete mixture was made with type 10 Portland cement, the other with 75% blast-furnace slag, 22% type 50 cement, and 3% silica fume.

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