Optimization of packing of local coarse aggregates for use in UHPC (ultra-high performance concrete)
2020
Zavickis, J., Dzelzsbetons MB, SIA, Liepaja (Latvia) | Lukasenoks, A., Betona pētījumu centrs, SIA, Riga (Latvia) | Macanovskis, A., Riga Technical Univ. (Latvia) | Tupesis, M., Riga Technical Univ. (Latvia)
Innovations in the construction industry require new and efficient materials, like ultra-high performance concrete (UHPC), which allows to develop and engineer unprecedented construction solutions. Aggregate packing gives a significant contribution to the final properties of concrete design and especially – ultra-high performance concrete. High-quality coarse aggregates (0−1.25mm) of local origin were used to investigate the packing density, consistency and compressive strength of ultra-high performance concrete for application in advanced prefabricated concrete products (facades, balconies, stairs, structural elements). Several sources of high-quality quartz sand pits in the Baltic state region were evaluated and fractioned quartz sand from Lithuanian company AB Anykščių Kvarcas was chosen for experiments. Optimization of the packing density was performed using different experimental methods: Punkte test and ICT testing. Wet and dry experimental methods of assessing void volume in the coarse aggregate mix were used. Different mixes of coarse aggregates were prepared and optimal paste/aggregate proportion was found to deliver necessary fresh concrete flowing properties and hardened concrete compressive strength of the final mix. Conclusions were made on possibility and feasibility to use coarse aggregates of local origin for the development of cost-efficient ultra-high performance concrete mix design for use in advanced prefabricated concrete products.
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