A new lightweight masonry block: Thermal and mechanical performance

The concerns with masonry building envelope performance, particularly thermal efficiency, are causing major changes in masonry solutions, mainly in south European countries, where traditionally the mild winter climate justified the use of high thermal masonry wall performance. The new European Directives regulations require different solutions. This paper describes the development a new masonry system, based on lightweight concrete units, intended for construction of large single leaf external walls without thermal insulation materials. A detailed analysis and optimization has been performed by FEM, under thermal point of view. This work was followed by a set of experimental tests in order to characterize the mechanical behavior of single units and masonry specimens. The concerns with productivity and ergonomics are also considered according their importance to the solution cost.

[1]  P. J. García Nieto,et al.  Analysis and optimization of the heat-insulating light concrete hollow brick walls design by the finite element method , 2007 .

[2]  F. Incropera,et al.  Fundamentals of Heat Transfer , 1981 .

[3]  M. Fardis,et al.  Designer's guide to EN 1998-1 and en 1998-5 Eurocode 8: Design of structures for earthquake resistance; general rules, seismic actions, design rules for buildings, foundations and retaining structures/ M.Fardis[et al.] , 2005 .

[4]  Tayfun Uygunoğlu,et al.  Investigation of properties of low-strength lightweight concrete for thermal insulation , 2007 .

[5]  Ana Bastos,et al.  Methodology for the Design of Lightweight Concrete with Expanded Clay Aggregates , 2005 .

[6]  Catarina F. Castro,et al.  Topology optimisation of masonry units from the thermal point of view using a genetic algorithm , 2011 .

[7]  David E. Goldberg,et al.  Genetic Algorithms in Search Optimization and Machine Learning , 1988 .

[8]  Khalifa S. Al-Jabri,et al.  Concrete Blocks for Thermal Insulation in Hot Climate , 2005 .

[9]  İlker Bekir Topçu,et al.  Manufacture of high heat conductivity resistant clay bricks containing perlite , 2007 .

[10]  Aslihan Tavil,et al.  Thermal behavior of masonry walls in Istanbul , 2003 .

[11]  Goldberg,et al.  Genetic algorithms , 1993, Robust Control Systems with Genetic Algorithms.

[12]  Carlos Alberto Conceição António,et al.  A study on synergy of multiple crossover operators in a hierarchical genetic algorithm applied to structural optimisation , 2009 .

[13]  D. E. Goldberg,et al.  Genetic Algorithms in Search , 1989 .

[14]  M. P. Morales,et al.  Influence of tongue and groove system on the thermal properties of large-format voided clay bricks for single-leaf walls , 2012 .

[15]  M. P. Morales,et al.  Study of the geometry of a voided clay brick using rectangular perforations to optimize its thermal properties , 2011 .

[16]  Ossama A. Abdou,et al.  The effect of air cells and mortar joints on the thermal resistance of concrete masonry walls , 1994 .