RT info:eu-repo/semantics/conferenceObject
T1 Early age monitoring and hardened properties of SCC with limestone filler and active mineral additions
A1 Barluenga Badiola, Gonzalo
A1 Palomar Herrero, Irene
A1 Puentes Mojica, Javier
K1 Cracking risk
K1 Drying shrinkage
K1 Early age monitoring
K1 Mineral addition
K1 Mechanical characterization
K1 Porosity
K1 Permeability
K1 Reaction index
K1 UPV
K1 SCC
K1 Self-Consolidating Concrete
K1 Arquitectura
K1 Architecture
AB An experimental program on SCC with limestone filler and three active mineral additions (AMA), microsilica (MS),nanosilica (NS) and Metakaolin (MC), was carried out to evaluate their influence during early ages and in thehardened state. The aim was to characterize SCC further than the usual workability and mechanical parameters, inthe understanding that the main microstructural changes in the material occur during the first hours and that earlyage cracking, porosity, pore size and permeability can compromise SCC durability.In-situ temperature, ultrasonic pulse velocity, mass loss and free drying shrinkage of samples subjected to a windflow were simultaneously monitored for 24 hours. Profiles of the reaction process, the microstructural evolution andthe physical effects of water evaporation were obtained. The early age measured parameters were related to areaction index (Ir,24), defined as the fraction of heat produced (accumulated plus released) with regard to the totalheat at 24 hours. The simultaneous monitoring of those parameters allowed a better understanding of themechanisms involved during early ages. These parameters were compared to the early age cracking due to dryingshrinkage.In the hardened state, a mechanical characterization was conducted and porosity and vapor permeability weremeasured on paste samples (without aggregates) under two environmental conditions during setting process:subjected to 3 m/s air flow and covered with a plastic film. The use of AMA increased mechanical strength.Although, the early age cracking risks also increased, especially in the case of AMA with smaller particle size (NSand MC). The external conditions applying on the samples during early ages also modify porosity, pore size andpermeability of the hardened SCC.
PB K. Wang and S.P. Shah
YR 2013
FD 2013
LK http://hdl.handle.net/10017/21396
UL http://hdl.handle.net/10017/21396
LA eng
NO Comunidad de Madrid
DS MINDS@UW
RD 25-abr-2024