Influence of Different European Cements on the Hydration of Cover-Zone Concrete during the Curing and Postcuring Periods

• Published in: Journal of materials in civil engineering 2013-09, Vol.25 (9), p.1335-1343
• Main Authors: McCarter, W. J, Starrs, G, Adamson, A, Chrisp, T. M, Basheer, P. A. M, Nanukuttan, S, Srinivasan, S, Green, C
• Format: Article
• Language: English
• Subjects: Aggregates and other concrete constituents; Applied sciences; Buildings. Public works; Cement concrete constituents; Concretes. Mortars. Grouts; Exact sciences and technology; General (composition, classification, performance, standards, patents, etc.); Materials; Natural aggregates; Technical Papers
• ISSN: 0899-1561; 1943-5533
• DOI: 10.1061/(ASCE)MT.1943-5533.0000678

AbstractThe durability of reinforced concrete structures depends, in the main, on the performance of the cover-zone concrete, which protects the steel from the external environment. This paper focuses on the use of discretized electrical property measurements to study depth-related features during both the curing and postcuring period, thereby allowing an integrated assessment of the protective properties of the cover region. In the current work, use is made of a small, multielectrode array embedded within the surface 75 mm of concrete specimens. Concretes were manufactured with different European cements (CEM) and water/binder ratios representing mixes that satisfied the minimum requirements for a range of environmental exposure classes, including exposure to chlorides. Electrical resistance measurements were taken over a period in excess of 300 days which showed ongoing hydration, pozzolanic reaction, and pore-structure refinement; in addition, in the postcuring period, when exposed to a cyclic chloride ponding regime, measurements could be used to study the convective zone and ionic enrichment of the surface layer.