26 - Alternative reinforcement for concrete

Abstract

When correctly specified and constructed, reinforced concrete is a cost-effective and durable construction material. However, the specification and/or use of inappropriate materials lead to poor durability, particularly in severe exposure conditions and with poor levels of workmanship. The major problem is the corrosion of the embedded steel reinforcement. This chapter discusses the alternative reinforcement materials that can be more durable in stressed conditions. These include: coated reinforcement either galvanized or fusion-bonded epoxy, stainless steel, and fiber composites. Fusion-bonded epoxy-coated reinforcement is used to combat huge economic cost of deterioration of reinforced concrete structures caused by reinforcement corrosion. It is recommended that no cracking should be allowed on any part of the coating when a bar is subjected to the specified bend test. Interest in the use of stainless steels as concrete reinforcement is attributable to their increased resistance to corrosion particularly in chloride-containing media. Further, the fibers are used in various forms, either in the form of ropes or fabric materials or, more generally, combined with a suitable resin to form a composite.