An investigation into common field methods of curing O.P.C. concrete

Abstract

There is a widely held view that curing of concrete in the field is not given the care and attention it requires as its importance is still not widely appreciated. Proper attention to the field methods of curing as well as a good knowledge and understanding of curing and its benefits, are essential for appropriate long-term durability of concrete. A literature review of curing technology with a particular emphasis on site curing and its associated difficulties are thus presented. Concrete curing is closely related to cement hydration, microstructure development and concrete performance throughout its service-life. The study highlights the main parameters affecting curing and the effects of curing and application methods on concrete properties, especially on the properties of surface concrete. The most commonly used field-methods of curing will be discussed. The major reasons for the prevailing bad practice of in situ curing are evaluated. These include a lack of knowledge by contractors about the subject and unambiguous specifications. This research has also established a baseline for further development of testing procedures for the evaluation of field-curing methods. Further insight on. the subject was obtained via an experimental investigation, the testing results of which are presented and discussed. The four methods of field curing employed were analysed in comparison to cube specimens water-cured in the laboratory as specified in Codes of Practice. Comparing the test results, the curing compound was found to be the most effective. The conclusion of this study concerns possible improvements in the field-curing practice of concrete. Recommendations for ensuring proper curing in the field and for further field study are provided.