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Early age monitoring of self-compacting concrete with mineral additions
https://orcid.org/0000-0002-2996-3412
Highlights SCC with limestone filler and several active mineral additions were investigated at early ages. Temperature, UPV, capillary pressure, drying shrinkage and cracking were monitored for 24h. Mineral additions brought forward the microstructure changes regarding reaction. Mineral additions on SCC increased cracking risks at early ages. Largest cracking risk if fast UPV increase occurred after drying shrinkage stabilized.
Abstract An experimental program on SCC at early age (EA), combining limestone filler with several active mineral additions (AMA), metakaolin (MC), microsilica (MS) and nanosilica (NS), was carried out to assess the temporal relations among hydration, microstructure changes and drying shrinkage and their influence on early age cracking risks. The relationships between cement reaction and microstructural changes were investigated by monitoring temperature and ultrasonic pulse velocity (UPV). The risk of early age cracking due to drying shrinkage was evaluated, monitoring water evaporation, capillary pressure and shrinkage and measuring cracking on double restrained slabs subjected to an air flow of 3m/s during the first 6h. The reaction process, the microstructural evolution and the physical effects of water displacement and evaporation could be followed. For a better comparison among the different compositions, the measured early age parameters were related to a reaction index (I r,24), defined as the fraction of heat produced (accumulated plus released) with regard to the total heat at 24h. Several relationships among the EA parameters were identified. Cracking risk due to drying shrinkage at EA increased when some events related to the early age parameters occurred simultaneously.
Early age monitoring of self-compacting concrete with mineral additions
https://orcid.org/0000-0002-2996-3412
Highlights SCC with limestone filler and several active mineral additions were investigated at early ages. Temperature, UPV, capillary pressure, drying shrinkage and cracking were monitored for 24h. Mineral additions brought forward the microstructure changes regarding reaction. Mineral additions on SCC increased cracking risks at early ages. Largest cracking risk if fast UPV increase occurred after drying shrinkage stabilized.
Abstract An experimental program on SCC at early age (EA), combining limestone filler with several active mineral additions (AMA), metakaolin (MC), microsilica (MS) and nanosilica (NS), was carried out to assess the temporal relations among hydration, microstructure changes and drying shrinkage and their influence on early age cracking risks. The relationships between cement reaction and microstructural changes were investigated by monitoring temperature and ultrasonic pulse velocity (UPV). The risk of early age cracking due to drying shrinkage was evaluated, monitoring water evaporation, capillary pressure and shrinkage and measuring cracking on double restrained slabs subjected to an air flow of 3m/s during the first 6h. The reaction process, the microstructural evolution and the physical effects of water displacement and evaporation could be followed. For a better comparison among the different compositions, the measured early age parameters were related to a reaction index (I r,24), defined as the fraction of heat produced (accumulated plus released) with regard to the total heat at 24h. Several relationships among the EA parameters were identified. Cracking risk due to drying shrinkage at EA increased when some events related to the early age parameters occurred simultaneously.
Early age monitoring of self-compacting concrete with mineral additions
https://orcid.org/0000-0002-2996-3412
Highlights SCC with limestone filler and several active mineral additions were investigated at early ages. Temperature, UPV, capillary pressure, drying shrinkage and cracking were monitored for 24h. Mineral additions brought forward the microstructure changes regarding reaction. Mineral additions on SCC increased cracking risks at early ages. Largest cracking risk if fast UPV increase occurred after drying shrinkage stabilized.
Abstract An experimental program on SCC at early age (EA), combining limestone filler with several active mineral additions (AMA), metakaolin (MC), microsilica (MS) and nanosilica (NS), was carried out to assess the temporal relations among hydration, microstructure changes and drying shrinkage and their influence on early age cracking risks. The relationships between cement reaction and microstructural changes were investigated by monitoring temperature and ultrasonic pulse velocity (UPV). The risk of early age cracking due to drying shrinkage was evaluated, monitoring water evaporation, capillary pressure and shrinkage and measuring cracking on double restrained slabs subjected to an air flow of 3m/s during the first 6h. The reaction process, the microstructural evolution and the physical effects of water displacement and evaporation could be followed. For a better comparison among the different compositions, the measured early age parameters were related to a reaction index (I r,24), defined as the fraction of heat produced (accumulated plus released) with regard to the total heat at 24h. Several relationships among the EA parameters were identified. Cracking risk due to drying shrinkage at EA increased when some events related to the early age parameters occurred simultaneously.
Early age monitoring of self-compacting concrete with mineral additions
Barluenga, Gonzalo (author) / Puentes, Javier (author) / Palomar, Irene (author)
Construction and Building Materials ; 77 ; 66-73
2014-12-19
8 pages
Article (Journal)
Electronic Resource
English
Early age monitoring of self-compacting concrete with mineral additions
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