Article ID Journal Published Year Pages File Type
6721167 Construction and Building Materials 2015 8 Pages PDF
Abstract
A comparative study assessed the effect of silica-based micro and nano additions on Self Compacting Concretes at early age (EA) and on hardened porosity and permeability. Several parameters were monitored during 24 h: water evaporation, capillary pressure, free drying shrinkage, temperature and ultrasonic pulse velocity (UPV). All the silica-based additions modified the material at EA regarding water displacements, the chemical reaction and the development of the hardened structure. Some effects of the silica-based additions depended on the particle size. Nanosilica accelerated SCC early stiffening and had larger EA water evaporation, which leaded to larger porosity at 7 days. However, leaded a lower hardened porosity and water vapor permeability was measured at 28 days due to the pozzolanic effect along with the particle size effect.
Related Topics
Physical Sciences and Engineering Engineering Civil and Structural Engineering
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