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An automated test method for density in the saturated surface dry state (SSD) of porous granular



Title: An automated test method for density in the saturated surface dry state (SSD) of porous granular materials
Author(s): F. Hlawatsch, H. Aycil and J. Kropp
Paper category : conference
Book title: 2nd International RILEM Conference on Progress of Recycling in the Built Environment
Editor(s): V.M. John, E. Vazquez, S.C. Angulo, C. Ulsen
e-ISBN: 978-2-35158-122-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 459 - 468
Total Pages: 10
Nb references: 4
Language: English


Abstract: The use of recycled C&DW as aggregates for concrete or similar applications usually involves a careful design of the mix proportions which is based on the attempt to densely pack the graded aggregates such, that no excessive amounts of binder is needed to fill the interstitial spaces, on the other hand assure a good workability of the mix. Because of the required accuracy in proportioning, however, the individual constituents of the mix are added according to their mass. The calculation of the mix proportion therefore requires detailed information on the density of the constituents.

Recycled aggregates usually have a higher porosity than natural aggregates, and therefore their apparent density varies over a wider range when their moisture content changes, e.g. due to preceding exposure to the atmosphere, rain or a treatment. Therefore, it is mandatory to determine the density of corresponding aggregates at different moisture states, for example in a dry state, a water saturated state or intermediate moisture state. The experimental procedures for the determination of the so called saturated - surface dry state (SSD) are complicated and time consuming, the emerging results are subject to important scatter. Different attempts have been made to introduce more reliable test methods.


Online publication: 2012-02-08
Publication type : full_text
Public price (Euros): 0.00