On-site curing of concrete - microstructure and durability

Curing is widely perceived as being an important factor in achieving durable concrete structures. However, direct evidence that the levels of curing achieved on-site increases durability is scarce. This publication describes the second phase of an investigation into the influence of practical on-site curing on the durability of concrete. The first phase was a literature review (CIRIA PR49, 1997 - now out of print) which arrived at limited conclusions concerning the effects of site curing on durability. In this investigation, scanning electron microscopy was used to evaluate the influence of different curing regimes and environmental exposures on the porosity and degree of hydration in the 'curing affected zone' (CAZ), and their influence on durability and abrasion resistance. This publication will be of interest to all design, specification, construction and supervising engineers involved in building and civil engineering works.