Use of Reflective Photoelasticity to Study Environmental Effects on Internal Stresses in Cementitious Materials.
Final technical rept.,
SHEFFIELD UNIV (ENGLAND)
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Tests are reported on the use of reflective photoelasticity to study the internal strain distribution in concrete systems under external load. The test specimens consisted of a single cylindrical aggregate core embedded in the matrix. The bond conditions of the aggregate and the gradation of the fine aggregate in the matrix were varied. The strains were measured by normal and oblique incidence methods using optical compensation. The results show that the maximum strain concentration occurred at the aggregate-matrix interface and the deformation was further enhanced when the aggregates were partially bonded. The coarser gradation of sand particles in the matrix resulted in greater non-uniformity of strains within the system. The tests emphasized the essential heterogeneity of concrete systems and the significant role of the aggregate-matrix bond on the behavior of concrete-like materials. Author
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