Abstract
Understanding moisture transport is an important step in the study of the durability of cement-based materials. A neutron imaging detection method for water transport in cement-based materials, based on a compact neutron source is provided. We visualize the moisture transport and obtain the capillarity coefficients for different cement-based materials using PKUNIFTY.
Highlights
As an important physical process, moisture transport in cement-based materials directly affects their service life and durability [1]
The water absorption in cement paste is enhanced with the addition of marble powder, while it is reduced with the addition of fly ash
This may be an experimental example of the fly ash effect [26]
Summary
As an important physical process, moisture transport in cement-based materials directly affects their service life and durability [1]. Neutron imaging has advantages for studying moisture transport and water-related durability issues of cement-based materials, due to its special cross-section features [2,3]. We attempted to study moisture transport in cement-based materials using a compact neutron source because of its advantages, including small size, low cost, easy operation and good flexibility [14]. Peking University Neutron Imaging Facility (PKUNIFTY) works on a radio frequency quadrupole (RFQ) accelerator-driven compact neutron source with a repetition period of 10 ms and pulse duration of 0.4 ms [14,15,16]. The wet and dry images were pre-processed by the following expression for dark current correction, flat field correction and neutron flux fluctuations correction [4].
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