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Self-cementing properties of crushed demolishing concrete in unbound layers results from triaxial tests and field tests

Authors
  • Arm, Maria
Type
Book
Journal
Waste Management
Publication Date
Jan 01, 2000
Volume
1
Pages
579–587
Identifiers
DOI: 10.1016/S0713-2743(00)80068-9
ISBN: 978-0-08-043790-3
Source
Elsevier
License
Unknown

Abstract

A two-year study is underway to evaluate the expected growth in stiffness in layers of crushed concrete from demolishing objects. This growth is said to be a result of self-cementing properties. The study comprises of repeated load triaxial tests on manufactured specimens after different storing time together with falling weight deflectometer, FWD, measurements on test sections. Results so far show a clear increase with time in resilient modulus and in back-calculated layer modulus for all concrete materials. The increase is largest the first months and then diminishes. The field measurements show a more considerable growth in stiffness than the laboratory tests, with a doubled value two years after construction. Comparative investigations on natural aggregates, mostly crushed granite do not show any growth in stiffness, neither in the laboratory nor in the field. Consequences for the choice of design modulus are discussed.

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