Are specifications impeding sustainability of concrete?

摘要

This has reference to the paper titled 'Are specifications impeding sustainability of concrete?' by Chetan Hazaree, Shashank Vaidya, Peter Taylor, Ashok Kr. Tiwari and Rajesh Gupta ', published in ICJ July 2015 issue (Vol 89, No. 7, pp. 52-63). In this paper the authors have mainly discussed the sustainability issues related to concrete and the drawback of current specifications of codes of practices. Though the paper is on sustainability of concrete, the authors focus mainly on the utilisation of fly ash and the associated sustainability benefits. The authors have made excellent studies on the effective utilisation of fly ash in concrete and addressed some of the concerns impeding full scale usage of fly ash concretes including high volume fly ash concrete. In addition the authors have discussed in length the provisions in codes, construction specifications, fly ash classification systems, variability in the fly ash, design issues and construction challenges the engineers are facing at present.