'UCTEA Chamber of Surveying and Cadastre Engineers'
Abstract
The recent effect of the new technical
standards – D.M. 14/01/2008, has led to a
significant revision of the Italian approach to its
precast building systems. Even more significant is
the revision of the concrete panels with thermal
break, which are increasingly popular after the
publication of the decrees D.Lgs. 192/05, D.Lgs.
311/06, D.P.R. 59/09. In this contex, Ruredil
S.p.A. has developed and patented a construction
system that uses a balanced net of carbon fiber as
reinforcement of external slab, therefore
achievable thinness, to the benefit of weight, of
resulting seismic actions, of insulating capacity
whith the same overall thickness of the panel.
The inserts used for the realization of the thermal
break, and then for the hanging and connecting
the external brought slab by the inner layer
structure, are of the type standard version, but it
was necessary to resolve issues related to the
connection of these inserts whith a small slab
thickness.
In the article the authors describe the system
and the project, give an account of experiments
carried out on the real panels, of techniques and
production problems, of the tests performed on
prototypes in the laboratoryof the Faculty of
Architecture of the IUAV University in Venice,
under the guard of professor Angelo Di Tommaso.
Under the structural profile, the studied and
performed panel consist of an internal inner layer,
insulated by sintered expanded polystyrene,
characterized by a very small thickness slab,
armed with a balanced net of carbon fiber, and by
a careful study in order to reduce the size of the
structural ribs, made possible thanks to less
weight of the article, up to halff that of traditional
panels, also aimed to maximize the proportion of
insulation in the total area of the panel; the
brought slab, external to insulating layer which
constitutes the thermal break, has the same
caractheristics as that of the inner layer.
The so realized panel results easily
developing and allows major cost savings while
maintaining all the characteristics of durability,
carrying capacity, workability and finishing that
characterize the concrete panels. Lightness,
leading to a consequent reduction of the seismic
actions, also allows for economies in the
structures and foundations. The panel is also to
have characteristics of eco-compatibility, as it
involves a general reduction in use of equipment
and a reduction of transport, with consequent
reductions in energy consumption and
atmospheric emissions associated with production
of raw materials and components for transport
