Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 86, Issue -, Pages 101-112Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2015.03.110
Keywords
Self-compacting concrete; Microstructure; Porosity; Permeability; Water absorption; Mercury intrusion porosimetry
Categories
Funding
- Polytechnic Institute of Lisbon
- Lisbon Superior Engineering Institute [SFRH/PROTEC/67426/2010]
- Foundation for Science and Technology (FCT)
- ICIST research centre from IST
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Self-compacting concrete (SCC) can soon be expected to replace conventional concrete due to its many advantages. Its main characteristics in the fresh state are achieved essentially by a higher volume of mortar (more ultrafine material) and a decrease of the coarse-aggregates. The use of over-large volumes of additions such as fly ash (FA) and/or limestone filler (LF) can substantially affect the concrete's pore structure and consequently its durability. In this context, an experimental programme was conducted to evaluate the effect on the concrete's porosity and microstructure of incorporating FA and LF in binary and ternary mixes of SCC. For this, a total of 11 SIX mixes were produced; 1 with cement only (C); 3 with C + FA in 30%, 60% and 70% substitution (fad); 3 with C + LF in 30%, 60% and 70% fad; 4 with C + FA + LF in combinations of 10-20%, 20-10%, 20-40% and 40-20% f(ad), respectively. The results enabled conclusions to be established regarding the SCC's durability, based on its permeability and the microstructure of its pore structure. The properties studied are strongly affected by the type and quantity of additions. The use of ternary mixes also proves to be extremely favourable, confirming the beneficial effect of the synergy between these additions. (C) 2015 Elsevier Ltd. All rights reserved.
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