Limit States and Service Life of Cement Renders on Façades

The research presented in this paper is related to the durability of cement renders on facades, based on fieldwork data relative to the condition and extent of degradation of 100 facades of residential buildings in Portugal. Deterioration paths are obtained for staining, cracking, and detachment that show the loss of performance of the facade over time until a critical minimum acceptance level is reached, which is considered an estimated durability limit. These degradation patterns are analyzed individually to confirm whether any of three types of defects can effectively be considered limit states for the durability of cement renders on facades. The combined effect of all the defects that occur is also modeled as a single degradation path, and the expected service life is quantified. The results confirm that detachment constitutes a limit state of cement-rendered facades because it directly affects the physical durability of renders. Staining and cracking alone do not generally tend to signal the end of t...

[1]  R.P.J. van Hees,et al.  The perception of small scale damage and repairs of natural stone , 2008 .

[2]  Alan Meier,et al.  Rating the energy performance of buildings , 2004 .

[3]  Sheldon M. Ross,et al.  Introduction to Probability and Statistics for Engineers and Scientists , 1987 .

[4]  W. B. Ledbetter,et al.  Causes of Quality Deviations in Design and Construction , 1992 .

[5]  Ioanna Papayianni,et al.  Strength–porosity relationships in lime–pozzolan mortars , 2006 .

[6]  M.Y.L. Chew,et al.  A neural network approach to assessing building façade maintainability in the tropics , 2004 .

[7]  Michael Yit Lin Chew,et al.  A multivariate approach to maintenance prediction of wet areas , 2004 .

[8]  Phil Parnham.  Prevention of Premature Staining in New Buildings , 1996 .

[9]  Jorge De Brito,et al.  Service life estimation of cement-rendered facades , 2008 .

[10]  J. Moubray.  Reliability-centred maintenance , 1995 .

[11]  Igal M. Shohet,et al.  Service life prediction of exterior cladding components under failure conditions , 2004 .

[12]  Ulrich Bogenstätter,et al.  Prediction and optimization of life-cycle costs in early design , 2000 .

[13]  Stewart Brand,et al.  How Buildings Learn: What Happens After They're Built , 1997 .

[14]  P. Chindaprasirt,et al.  Mixed cement containing fly ash for masonry and plastering work , 2005 .

[15]  T. McMahon,et al.  Updated world map of the Köppen-Geiger climate classification , 2007 .

[16]  Jorge de Brito,et al.  Quantifying environmental effects on cement-rendered facades: A comparison between different degradation indicators , 2008 .

[17]  A. M. Aikivuori.  CRITICAL LOSS OF PERFORMANCE - WHAT FAILS BEFORE DURABILITY , 1999 .

[18]  William G. Ramroth.  Planning for disaster : how natural and man-made disasters shape the built environment , 2007 .

[19]  Andrew C. Lemer,et al.  The fourth dimension in building : strategies for minimizing obsolescence , 1993 .

[20]  Michael Yit Lin Chew,et al.  Staining of Facades , 2003 .

[21]  Hülya Kus,et al.  Microenvironmental characterization of rendered autoclaved aerated concrete , 2002 .

[22]  B. Rudolf,et al.  World Map of the Köppen-Geiger climate classification updated , 2006 .

[23]  G. De Schutter,et al.  Quantification of the water demand of sand in mortar , 2004 .

[24]  Inês Flores-Colen,et al.  Expedient in situ test techniques for predictive maintenance of rendered façades , 2006 .

[25]  Constantinos A. Balaras,et al.  Deterioration of European apartment buildings , 2005 .

[26]  David S. Watt,et al.  Building Pathology: Principles and Practice , 2008 .

[27]  Björn Marteinsson,et al.  Overall survey of buildings- performance and maintenance , 1999 .