The effects of a rigid boundary on soil/structure interaction for concrete slabs on grade
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Date
1997
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Publisher
University of New Brunswick
Abstract
Much of the slab on grade testing presently done is performed using a thin layer o f
subgrade over a rigid boundary, such as a concrete floor. When the slab is loaded during
testing, some of the load will be supported by the rigid boundary (concrete floor) when a
thin subgrade is used. The rigid boundary provides support for the slab by taking some o f
the applied load and minimizing the settlement of the subgrade below it. This poses a
problem when the results from this data are applied to practical slab on grade applications
where there is no rigid boundary below the slab.
This report presents data from a test on a steel fibre reinforced concrete (SFRC)
slab on a 150 mm subgrade over a rigid boundary. The data from the test are compared to
other similarly tested slabs reported in literature and two identical slabs tested at UNB on
a 800mm subgrade. From these comparisons, the effect of the lower rigid boundary on
the performance of concrete slabs is investigated.