Abstract
This research examines the behavior of capacitive humidity sensors in monitoring the drying of concrete walls in continuous measurements in laboratory conditions. Tests are carried out using continuous measuring of moisture with different capacitive sensors in concrete structures varied with three different types of thermal insulation materials. Sensors are sealed in plastic tubes that were preinstalled into the casting molds. Three borehole measurements are carried out as reference during the research. Results show differences in performance between the examined humidity sensors from two different manufacturers. The main difference is related to stability as sensors from the other manufacturer prove to be more prone to error. The study affirms that measuring humidity in concrete is challenging even when using high-quality humidity sensors.
Highlights
Evaluating the humidity of cast structures is a critical part of a construction stage
The study monitored the moisture of cast concrete structures using capacitive humidity sensors with continuous measurements
Due to problems found in previous study, this study focuses on the behavior of capacitive humidity sensors in similar experimental arrangements
Summary
Evaluating the humidity of cast structures is a critical part of a construction stage. An adequate drying of structures before installation of insulating layers must be ensured. A reliable measuring method is required to monitor the moisture of cast structures. Several different methods have been used to evaluate the drying of cast structures. The method is broadly used and reliable for measuring moisture in concrete structures and is the most common method in the Nordic countries. Humid concrete is a demanding measurement environment for capacitive humidity sensors. The study monitored the moisture of cast concrete structures using capacitive humidity sensors with continuous measurements. The aim of the study is to investigate the behavior of capacitive humidity sensors in monitoring the drying of cast concrete walls by comparing side-by-side measuring devices of two different known manufacturers and using their different filter options
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