Visualization and quantification of water movement in porous cement-based materials by real time thermal neutron radiography: Theoretical analysis and experimental study

被引:0
作者
Peng Zhang
F H Wittmann
TieJun Zhao
E Lehmann
ZuQuan Jin
机构
[1] Qingdao Technological University,Center for Durability & Sustainability Studies of Shandong Province
[2] Aedificat Institute Freiburg,Department of Spallation Neutron Source (ASQ)
[3] Paul Scherrer Institute,undefined
来源
Science China Technological Sciences | 2010年 / 53卷
关键词
thermal neutron radiography; visualization; quantification; water penetration; moisture diffusion; cement-based materials;
D O I
暂无
中图分类号
学科分类号
摘要
Water movement in porous cement-based materials is of great importance when studying their deterioration processes and durability. Many traditional methods based on mass changes, electricity or nuclear magnetic resonances are available for studying water transport in cement-based materials. In this research, an advanced technique i.e. thermal neutron radiography was utilized to achieve visualization and quantification of time dependent water movement including water penetration and moisture vapor in porous cement-based materials through theoretical analysis and experimental study. Because thermal neutrons experience a strong attenuation by hydrogen, neutron radiography exhibits high sensitivity to small amounts of water. A neutron transmission analysis for quantitative evaluation of raw radiographic measurements was developed and optimized based on point scattered functions (PScF). The determinations of the real time and space dependent water penetration into uncracked and cracked mortar samples, as well as the drying process have been presented in this paper. It is illustrated that thermal neutron radiography can be a useful research tool for visualization and quantification of water movement in porous building materials. The obtained results will help us to better understand deteriorating processes of cement-based materials and to find ways to improve their durability.
引用
收藏
页码:1198 / 1207
页数:9
相关论文
共 43 条
[1]  
Phillipson M. C.(2007)Moisture measurement in building materials: an overview of current methods and new approaches Build Serv Eng Res Technol 28 303-316
[2]  
Baker P. H.(2004)A comparison of different techniques to quantify moisture content profiles in porous building materials J Therm Envelope Build Sci 27 261-276
[3]  
Davies M.(1979)Unsaturated water flow within porous materials observed by NMR imaging Nature 281 56-57
[4]  
Roels S.(2007)Moisture transport in heated concrete as studied by NMR and its consequences for fire spalling Cem Concr Res 27 894-901
[5]  
Carmeliet J.(1989)A gamma-ray spectrometer for measurement of the water diffusivity of cementitious materials Mater Res Soc Symp Proc 137 165-169
[6]  
Hens H.(1998)Determination of moisture distributions in porous building materials by neutron transmission analysis Mater Struct 31 218-224
[7]  
Gummerson R. J.(2005)Methods of scattering corrections for quantitative neutron radiography Nucl Instrum Meth A 542 353-360
[8]  
Hall C.(2006)Investigation of water imbibition in porous stone by thermal neutron radiography J Phys D: Appl Phys 39 4284-4291
[9]  
Hoff W. D.(2004)High-speed thermal neutron tomography for the visualization of water repellents, consolidants and water uptake in sand and lime stones Radiat Phys Chem 71 807-808
[10]  
Heijden G. H.(2006)Water absorption into construction materials: comparison of neutron radiography data with network absorption models Transp Porous Media 63 503-525