ABSTRACT
Radical Concrete Technology. Edited by R K Dhir and P C Hewlett. Published in 1996 by E & FN Spon, 2-6 Boundary Row, London SE1 8HN, UK. ISBN 0 419 21480 1. ABSTRACT. Electro-conducting concrete is useful alternative to the applications traditionally associated with ceramic. However, further technological progress in the area is limited with low early strength (use of admixtures which accelerate the hardening of cement is ineffective due to increasing of ionic conduction) and unstable electrical conductivity associated with covering of electro-conducting particles with hydration products. To solve these problems it has been proposed to add calcium silicate hydrate gel into the composition of electro-conducting concrete. In this paper the gel-modified cements based on ordinary Portland cement were investigated. The desiccated gel was used to substitute part of cement. It has been shown that gel admixtures in pressed cements play an important role. Thus, the use of gel results in early compressive strength increased by a factor of 1.5-2.0. Also dry compaction of gel-cement mixtures and short time water saturation lead to high strenght gain. The results obtained indicate the possibility to produce cement based composites with required electrical conductivity. Keyword: Electro-Conducting Concrete (ECC), Gel-Modified cement (GMC), Ordinary Portland cement (OPC). Professor Maxunov S Y is Director of the Section of Materials of Contact Hardening, Scientific Research Institute on Binders and Materials, Kiev, Ukraine. Mr Galuzinskiy M G is a Candidate of Cathedra of Building Materials, Kiev State Technical University of Construction and Architecture, Ukraine.
