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High filler concrete using pulverized fuel ash: Chloride penetration and microstructure

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Author: Valcke, S.L.A. · Polder, R.B. · Nijland, T.G. · Leegwater, G.A. · Visser, J.H.M. · Bigaj-Van Vliet, A.A.J.
Type:article
Date:2010
Source:2nd International Conference on Sustainable Construction Materials and Technologies, 28 June 2010 through 30 June 2010, Ancona, 1231-1242
Identifier: 460800
ISBN: 9781450714907
Keywords: Materials · Built environment · Building Engineering & Civil Engineering · BM - Building Materials · TS - Technical Sciences

Abstract

The strength of concrete is linked to the amount of cement used. In many applications, concrete has a considerably higher strength than designed and structurally required. Lowering cement contents, thus reducing strength, significantly reduces the ecological impact of any concrete in terms of raw materials use and CO 2 output. A lower cement content may be achieved by replacing cement using high amounts of filler (e.g., fly ash) and simultaneously lowering the total amount of cement + filler (powder). The question arises how the required durability of such High Filler (HiFi) concrete for a specific application should be achieved. In the current paper HiFi concrete is tested for chloride penetration, using rapid chloride migration and diffusion tests. Also the microstructure is investigated using polarization-and-fluorescence microscopy on both laboratory samples and samples from pilot projects. The results show possibilities and limitations of HiFi concrete for making a design for long service life.