Concrete Repairs Performance in Service and Current Practice







Introduction

Structural concrete in its modern form has been in use

since the late 1800s and many early structures have

continued in operational use for over 100 years. At the

time they were constructed there were no design codes

and little was known about durability. There was a general

belief that concrete was a problem-free material requiring

little or no maintenance. Indeed, concrete was used as a

cladding on steel structures to protect them from

corrosion and fire and for the most part it has been very

successful in such applications. Performance of these

early structures has been surprisingly good when it is

considered that cover thicknesses over the steel

reinforcement were very low. Moreover, the concrete was

placed by hand with no vibration, invariably had cold

construction joints, and voids were commonplace.





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