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How can the HygroBug™ help monitor drying of damp concrete?

Some of the problems of monitoring the drying of concrete are:

  • Drying from surface can mislead as to in depth humidity if measurements are done at the surface, or …
  • … Equalisation period is too long, and …
  • … salts and impurities can distort results.
  • Conductive materials can with traditional measurement techniques indicate materials are saturated when they are actually dry, while …
  • … capacitance type “in-hole” sensors are sometimes too slow to respond to subtle shifts…
  • … especially at very high levels of Humidity…
  • … and the tolerance range at high RH of some capacitance sensors gets very wide, eg +/- 5RH at saturated levels
  • Variation within slabs, and from slab to slab means quick, cost effective, reliable monitoring from multiple locations is desirable
  • Continuous real-time monitoring is needed to understand what is going on during drying, and afterwards in stabilisation.

The HygroBug has been developed to meet some of these challenges and will deliver the following benefits:

  • low cost & consistent [so can be deployed in multiple locations]
  • Provides a reliable measurement which is not distorted by conductive materials
  • very responsive AND stable at very high RH % as well as “normal” RH %
  • can be fitted at various depths in the slab
  • connects to any HygroNet system for real time & on-line monitoring or any proprietary Hygrometer with a resistance WME input 3.5mm jack point
  • Consistent, so allows benchmark drying
  • Low Hysteresis and fast response so suits on/off/on/off heat drying regimes

 

Results from a series of HygroBugs in environmental chamber at Warwick University, displaying repeatability and quick response time

Results from a series of HygroBugs in environmental chamber at Warwick University, displaying repeatability and quick response time