Concrete, mortar and plaster using titanium dioxide nanoparticles: applications in pollution control, self-cleaning and photo sterilization - Nanotechnology in Eco-efficient Construction - page 317

Table 13.1 Examples of patents on TiO 2 in building materials

Year Code Country Title

2009 13337 United Nations Coatings based on hydraulic binders

with an optimal rheology and high
photocatalytic activity

2008 17934 United Nations New precast cementitious products

with photocatalytic activity

2008 236450 USA Photocatalytic granular mixture for

mortar and concrete and its use

2007 1752429 A1 Europe Bituminous road surface with a

photocatalytic effect and a procedure
for the preparation of said road
surface

2006 565 United Nations High durability photocatalytic paving

for reducing urban polluting agent

2006 2425075 A UK Concrete roof tile or wall cladding

element

2005 1609910 Europe A pavement with photocatalytic effect

2004 74202 United Nations Cement-based paving blocks for

photocatalytic paving for the
abatement of urban pollutants

2002 2002242113 Japan Coating method of photocatalyst layer

to pavement for air purifi cation

2002 6409821 USA Hydraulic binder and cement

composition containing photocatalyst
particles

1999 5861205 USA NO x cleaning paving block

1998 10219920 Japan Extrusion-molded building materials for

removal of nitrogen oxide and their
manufacture

strongly infl uences the test methods and the expected results: porous
cementitious materials will necessarily undergo a different procedure with
respect to compact ceramics, and further differences will characterize the
testing of coatings. This short survey will only focus on standards referring
to cement-based, and therefore intrinsically porous, photocatalytic
materials.
The formulation of such standards in Europe was entrusted to an offi cial
working group of CEN (European Committee for Standardization), who
was asked to defi ne technical specifi cations and guidelines: the activity is
not closed yet, and the group is still working on it. In the meanwhile, some
documents were produced by the ISO (International Standards Organiza-
tion) working group on photocatalytic materials, starting in 2007, focusing
on photocatalytic fi ne ceramics (Table 13.2). Other standards are under
evaluation and will be published probably in the next few years. These

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