THERMAL SHOCK EFFECTS ON BONDING OF CEMENT MORTAR RENDERINGS

Author(s): Esquivel, J. F. T. and Barros, M.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
e-ISBN: 978-2-35158-149-0
Publication year: 2015
Pages: 458-466
Total Pages: 9
Language: English

Abstract: The use of cement mortar renderings in external walls either as an intermediate layer or finishing layer is an extended practice for almost every residential building in Brazilian cities. Nevertheless durability of these renderings is still a concern for technicians, mainly about cracking and loss of bond.

This work aims to analyze experimentally, thermal shock degradation effects on bonding of cement mortar renderings.

In order to support experimental model a cement mortar rendering bonded to a concrete substrate was simulated under thermal stresses caused by a thermal shock and a Finite Element Analysis was made. This numerical model let define a critic scenario with the existence of bond flaws in the interface of cement mortar and concrete substrate during the event of thermal shock and also geometrical characteristics of experimental model. Other boundary conditions were defined using standards parameters.

Finally, pull-off tests were made on experimental models after the thermal shock cycles and the results were analyzed with statistical support.

Experimental results showed a decrease of bonding resistance of the rendering with the increase of rates of bond flaws and degradation of bonding resistance was increased after the thermal shock cycles.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00