Asfalto

http://www.guillermoluijk.com/tutorial/histogrammar/index.htm




http://www.flickr.com/groups/cafe_portenio_ilustrado/discuss/72157604017401241/

http://www.guillermoluijk.com/

http://www.dzoom.org.es/noticia-1790.html
http://www.dzoom.org.es/noticia-1708.html

HDR
http://www.tutordigital.net/?p=387



When solar radiation is absorbed by a material and transferred back the surrounding atmosphere this is known as heat island effect

http://www.concretethinker.com/specifications/Concrete-Paving-Guidelines.aspx


Ordinary portland cement concrete generally has a solar reflectance of approximately 0.35 to 0.4

http://www.concretethinker.com/solutions/Heat-Island-Reduction.aspx

Owing to its pozzolanic properties, fly ash is used as a replacement for some of the Portland cement content of concrete. The use of fly ash as a pozzolanic ingredient was recognized as early as 1914, although the earliest noteworthy study of its use was in 1937. Before its use was lost to the Dark Ages, Roman structures such as aqueducts or the Pantheon in Rome used volcanic ash (which possesses similar properties to fly ash) as pozzolan in their concrete. As pozzolan greatly improves the strength and durability of concrete, the use of ash is a key factor in their preservation

http://www.quesabesde.com/camdig/articulos.asp?articulo=117