"Adding waste means that the end product has low thermal conductivity and is therefore a good insulator," explains Carmen Martínez, researcher at the University of Jaen, in a release by the Spanish Foundation for Science and Technology (FECYT). "In addition to the resulting benefit of using these bricks instead of their traditional counterparts made of traditional raw materials."

 

The team's pressure and extrusion manufacturing process is something like making sausage, or squeezing out Play-Doh logs.

Adding waste to the brick prototypes means that they provide energy due to their organic material content, researchers say. That could help to reduce fuel consumption and kiln time required for brick production.

 

Brick by Brick

 

The prototype brick is small—just 3 x 1 x 6 cm. But the team has also successfully been testing larger bricks, reports say.

 

"On the whole, this technique could bring about a saving in energy and raw materials for brick factories along with environmental benefits from the use of waste that is initially discarded,"  said Martínez.

 

The chief drawback of the prototypes (their "Achilles heel," according to FECYT) is their lower mechanical resistance compared to traditional bricks, "although this parameter is above the legal minimum," the foundation reports.

Researchers are working to strengthen the bricks' mechanical resistance.

In addition, "there are still a few problems to solve in the adherence and shaping of those pieces that have high percentages of paper waste," the foundation reports.

 

The team is thus tweaking its recipe with other products, including residues from the beer, olive and biodiesel industries.

 

In a separate study, the same researchers have reported that biodiesel waste can be used for brick manufacture, thus increasing insulation capacity by 40 percent.

 

 

"Adding waste means that the end product has low thermal conductivity and is therefore a good insulator," explains Carmen Martínez, researcher at the University of Jaen. "In addition to the resulting benefit of using these bricks instead of their traditional counterparts made of traditional raw materials." Another of the advantages of adding waste to the brick prototypes is that they provide energy due to their organic material content. This could help to reduce fuel consumption and kiln time required for brick production. At the moment the prototype's dimensions are small (3 x 1 x 6 cm). But the team has already tested larger bricks and the results are similar. "On the whole, this technique could bring about a saving in energy and raw materials for brick factories along with environmental benefits from the use of waste that is initially discarded," adds Martínez. The researcher recognises, however, that the 'Achilles heel' of these bricks is their lower mechanical resistance compared to traditional bricks, although this parameter is above the legal minimum. There are still a few problems to solve in the adherence and shaping of those pieces that have high percentages of paper waste. The team continues in their search for the happy medium between sustainability and material resistance and is still researching the advantages of adding other products, such as sludge from water treatment plants or residues from the beer, olive and biodiesel industries. In the Fuel Processing Technology journal itself, the researchers have published another study confirming that biodiesel waste can be used for brick manufacture, thus increasing insulation capacity by 40%. More information: Carmen Martínez, Teresa Cotes, Francisco A. Corpas. "Recovering wastes from the paper industry: Development of ceramic materials". D. Eliche-Quesada, S. Martínez-Martínez, L. Pérez-Villarejo, F. J. Iglesias-Godino, C. Martínez-García, F.A. Corpas-Iglesias. "Valorizationof biodiesel production residues in making porous clay brick". Fuel Processing Technology 103, 2012. Doi: 10.1016/j.fuproc.2011.10.017 and 10.1016/j.fuproc.2011.11.013 Provided by Spanish Foundation for Science and Technology (FECYT) search and more info

Read more at: http://phys.org/news/2012-12-paper-bricks.html#jCp