Title:
Performance-Based Specifications for Concrete to Advance Sustainable Development
Author(s):
K. H. Obla
Publication:
Symposium Paper
Volume:
269
Issue:
Appears on pages(s):
7-20
Keywords:
green; optimization; performance specifications; quality; sustainability; variability.
DOI:
10.14359/51663718
Date:
4/30/2010
Abstract:
This article makes a strong case that prescriptive specifications are an impediment to sustainability. Some of the least sustainable prescriptive requirements are the use of minimum cementitious contents, restrictions on types and dosages of SCMs, and the overuse of maximum w/cm. It is not feasible to adopt an optimized prescriptive specification. On the other hand, performance-based specifications allow for mixture optimization, which requires producers and contractors to be more knowledgeable about their materials. Performance-based specifications reward attaining lower variability, which promotes investment in better quality and improved technology practices. Optimized mixtures with a lower variability will result in mixtures that are more cost-effective and sustainable. The article concludes by making a case that sustainability is more than CO2 emissions from cement and concrete production only.