Embedded Sensors for Measuring Environmental Parameters in Concrete

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Title: Embedded Sensors for Measuring Environmental Parameters in Concrete

Author(s): D.A. Lange, Z.C. Grasley, and R. Rodden

Publication: Special Publication

Volume: 252

Issue:

Appears on pages(s): 41-52

Keywords: cracking; creep; embedded sensors; environment; instrumentation; relative humidity; shrinkage; slab curling; temperature

Date: 3/1/2008

Abstract:
Environmental factors are major considerations of health monitoring of structures. A new system has been developed for measuring the internal relative humidity and temperature in concrete laboratory specimens and field structures. Internal relative humidity measurements in concrete are useful for evaluating shrinkage stress development and assessing structural susceptibility to durability problems. This paper describes the system, presents the essential elements of analysis that relates RH to internal stress in porous materials, and presents field applications that shows how environment data can facilitate analysis of stress and deformation of pavement. The new system has been used in laboratory and field experiments. Advantages of the new system are summarized. Some problems encountered in measuring relative humidity, especially in the field, are discussed.