Conceptual Reference Database for Building Envelope Research Prev
Next

Analysis of selected water absorption coefficient measurements

Bomberg, M., Pazera, M., Plagge, R.
2005
Journal of Thermal Envelope and Building Science, Vol. 28, No. 3, 227-243


Bomberg, M., Pazera, M., Plagge, R., (2005), "Analysis of selected water absorption coefficient measurements", Journal of Thermal Envelope and Building Science, Vol. 28, No. 3, 227-243.
Abstract:
For isotropic materials with a significant fraction of micro-pores, the cumulative water intake per unit of inflow surface area typically yields a linear function of the square root of time elapse. The authors postulate that this dependence has a limited range of validity. The validity of this approximation starts from an initial period that is inversely proportional to the rate of water intake and ends much before the material reaches the capillary moisture content.

Experimental investigation presented here uses a differential presentation of the cumulative water inflow and clearly indicates that material such as calcium silicate or brick belong to a broad class of materials characterized by a constant water absorption coefficient (A-coefficient). Initial period varies from 1/2 to 4 minutes. On the other hand, materials with a multiple pore-system such as an Aerated Autoclaved Concrete (AAC) may display a systematically varying A-coefficient. Authors propose a test procedure limited to 1-hour duration that can be used to derive a practical and reproducible value of A-coefficient.


Related Resources:

This publication in whole or part may be found online at: This link was checked on Dec. 2006here.

Related Concepts


Author Information and Other Publications Notes
Bomberg, M.
  1. Building envelope and environmental control - Part 3: Issues of system integration
  2. Building envelope and environmental control: issues of system integration
  3. Building envelope design, Part 2: estimating field performance of thermal insulation
  4. Building envelope: Heat, air and moisture interactions
  5. Final Report from Task 8 of MEWS Project (T8-03) - Hygrothermal Response of Exterior Wall Systems to Climate Loading: Methodology and Interpretation of Results for Stucco, EIFS, Masonry and Siding Clad Wood-Frame Walls
  6. Heat, air and moisture control in walls of Canadian houses: a review of the historic basis for current practices
  7. In-Situ performance evaluation of exterior insulation basement systems (EIBS) - spray polyurethane foam: summary report
  8. Integrated Methodology for Evaluation of Energy Performance of the Building Enclosures -- Part 1: Test Program Development
  9. Integrated methodology for evaluation of energy performance of the building enclosures: part 3 ¡ª uncertainty in thermal measurem
  10. Modified cup for testing of water vapour transmission through thick, permeable materials
  11. Moisture management of EIFS walls. Part 1.The basis for evaluation
  12. Performance evaluation of exterior insulation and finish systems (EIFS)
  13. Position paper on material characterization and HAM model benchmarking
  14. Report from Task 2 of MEWS Project - Description of 17 Large Sale Wall Specimens Built for Water Entry Investigation in IRC Dynamic Wall Testing Facility
  15. Report from Task 8 of MEWS Project - MEWS Methodology for Developing Moisture Management Strategies - Application to Stucco Clad Wood-Frame Walls in North America
  16. The energy conundrum of modern buildings
  17. Three-dimensional analysis of thermal resistance of exterior basement insulation systems (EIBS)
  18. Towards an engineering model of material characteristics for input to ham transport simulations - Part 1: an approach
  19. Water vapor transmission and moisture accumulation in polyurethane and polyisocyanurate foams
  20. Water vapor transmission through building materials and system: mechanisms and measurement  
Pazera, M.
  1. Modified cup for testing of water vapour transmission through thick, permeable materials  
Plagge, R.
Institute of Building Climatology, Faculty of Architecture, University of Technology, Dresden, Germany.
  1. A comparison of different techniques to quantify moisture content profiles in porous building materials
  2. A two-levelled hygrothermal material database for the numerical simulation program DELPHIN4
  3. Numerical and experimental investigation of coupled heat and moisture transport problems
  4. On the hysteresis in moisture storage and conductivity measured by the instantaneous profile method  



CRDBER, at CBS, BCEE, ENCS, Concordia,