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Title: Real-time measurements of temperature, pressure and moisture profiles in High-Performance Concrete exposed to high temperatures during neutron radiography imaging

High-Performance Concrete (HPC) is particularly prone to explosive spalling when exposed to high temperature. Although the exact causes that lead to spalling are still being debated, moisture transport during heating plays an important role in all proposed mechanisms. In this study, slabs made of high-performance, low water-to-binder ratio mortars with addition of superabsorbent polymers (SAP) and polypropylene fibers (PP) were heated from one side on a temperature-controlled plate up to 550 °C. A combination of measurements was performed simultaneously on the same sample: moisture profiles via neutron radiography, temperature profiles with embedded thermocouples and pore pressure evolution with embedded pressure sensors. Spalling occurred in the sample with SAP, where sharp profiles of moisture and temperature were observed. No spalling occurred when PP-fibers were introduced in addition to SAP. The experimental procedure described here is essential for developing and verifying numerical models and studying measures against fire spalling risk in HPC.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [1] ;  [5] ;  [6] ;  [3] ;  [1] ;  [7]
  1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf (Switzerland)
  2. (Latvia)
  3. Politecnico di Milano, Department of Civil and Environmental Engineering, Milan (Italy)
  4. (Poland)
  5. Riga Technical University, Institute of Materials and Structures, Riga (Latvia)
  6. Paul Scherrer Institute, Laboratory for Neutron Scattering and Imaging, Villigen (Switzerland)
  7. (IfB), Zürich (Switzerland)
Publication Date:
OSTI Identifier:
22475489
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 68; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; CONCRETES; FIBERS; HEATING; HUMIDITY; MORTARS; NEUTRON RADIOGRAPHY; PLATES; POLYPROPYLENE; PORE PRESSURE; PRESSURE MEASUREMENT; SENSORS; SLABS; TEMPERATURE MEASUREMENT; THERMOCOUPLES; TIME MEASUREMENT