Relationship between critical mechanical properties and age for structural lightweight concrete.
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1964-02-25
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Abstract:The necessity to use structural lightweight concrete has created
a need for investigations into its critical mechanical properties that
affect the design and performance of structures. The primary critical
properties were found to be direct tensile stress-strain characteristics
and the restrained volume changes. These two properties were experimentally
determined and analyzed, along with the compressive, indirect
tensile (split cylinder), and flexural strengths. With age as a fundamental
variable, these properties were determined for several curing-condition
and mix-design parameters.
A primary finding from this study was the good correlation
exhibited between direct tensile strength and both compressive strength
and indirect tensile strength. A direct tensile test method was developed
which yields consistently reliable results and from which valuable information
On fundamental concrete tensile behavior can be obtained. Along with
the concrete direct tensile properties, this test yielded information on
the effects of restraining the concrete from changing in volume as a
result of hydration and changes in moisture. This restraint was
developed by the inclusion of a deformed bar through the specimen.
The concrete stresses developed from this restraint yielded important
clues toward a better understanding of concrete behavior. It was found
that this type of structural lightweight concrete, when oven dried at
1l0F, attempts to shrink resulting in restrained tensile concrete
stresses as high as 70 per cent of the concretets tensile strength.
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