Print Email Facebook Twitter The use of particle packing models to design ecological concrete Title The use of particle packing models to design ecological concrete Author Fennis, S.A.A.M. Walraven, J.C. Den Uijl, J.A. Faculty Civil Engineering and Geosciences Department Design and Construction Date 2009-06-18 Abstract Ecological concrete can be designed by replacing cement with fillers. With low amounts of cement it becomes increasingly important to control the water demand of concrete mixtures. In this paper a cyclic design method based on particle packing is presented and evaluated on the basis of experiments on cement pastes combined with quartz powder. The packing density of sixteen pastes is measured using the mixing energy test. Furthermore, the cement pastes were tested on compressive strength at 7 and 28 days. Adding quartz powder M600 can increase the packing density by more than 10%. This means that fine quartz powders can improve the packing density to such extent that the cement content can be decreased while simultaneously the water cement ratio is decreased. This occurs for pastes with a packing density higher than the completely saturated packing density of cement. Additional strength tests were performed on two mixtures with constant water cement ratio and showed a 15% strength increase when 20% of the cement was replaced by quartz powder M600. In the design procedure for ecological concrete, increased strength efficiency can be balanced by lowering the amount of cement. Subject cement pasteecological concretefillerparticle packingwater demand To reference this document use: http://resolver.tudelft.nl/uuid:df0fdbfa-5cde-4c80-9e2a-1a9008a90e44 ISSN 0046-7316 Source Heron, 54 (2/3) Part of collection Institutional Repository Document type journal article Rights (c) 2009 S.A.A.M. Fennis; J.C. Walraven; J.A. den Uijl Files PDF The_use_of_particle_packi ... crete_.pdf 521.17 KB Close viewer /islandora/object/uuid:df0fdbfa-5cde-4c80-9e2a-1a9008a90e44/datastream/OBJ/view