An approach for determining the extent of contribution of construction project features to accident causation

The strength of steel-reinforced concrete greatly depends on the adequacy of the bond between concrete and steel reinforcement and this can be impaired by the surface condition of reinforcing steel. Oil on the surface of steel reinforcement has been mentioned to potentially have an adverse effect on steel-concrete bonding action and consequently structural performance, but this effect remains to be buttressed empirically. This study thus considered the effect of the surface condition of deformed mild steel bar on the bond strength and the flexural strength of steel-reinforced concrete, with the surface condition being engine oil coating. Bond and flexural test involving concrete embedded with steel bars coated with engine oil and un-coated steel bars (i.e. bars not coated with engine oil) revealed that engine oil coating considerably reduces the bond and flexural strength of reinforced concrete. Steel reinforcement during storage and installation should thus be protected from contamination by oiling agents.

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