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A Sensor for Embedded Stress Measure of Concrete: Testing and Material Heterogeneity Issues

Authors
  • Anerdi, C.
  • Gino, D.
  • Malavisi, M.
  • Bertagnoli, G.
Publication Date
Jan 01, 2020
Source
PORTO Publications Open Repository TOrino
Keywords
Language
English
License
White

Abstract

Concrete is well known to be a heterogeneous material that is usually considered homogeneous only referring to a scale of several centimetres. This characteristic makes measuring stresses inside concrete a particularly difficult task. Strains can be measured using several well-known devices. Nevertheless, it is almost impossible to derive a correct estimation of the stress within a concrete structure starting from strain measures as the modulus of elasticity is variable and unknown and creep strains superimpose elastic ones. A preliminary experimental campaign performed to test a stress sensor with the dimensions of a coin to be embedded in concrete is described in the present paper. The effects external applied load are measured comparing the results of short-term loading test performed directly on the sensor and on concrete specimens.

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