Testing the of a papercrete panel Papercrete is a construction material which consists of re-pulped with or and/or other soil added. First patented in 1928, it was revived during the 1980s. Although perceived as an environmentally friendly material due to the significant recycled content, this is offset by the presence of cement.

Construction material made with waste paper, cement and water. Papercrete had been. Using papercrete building blocks in place of conventional or concrete.

The material lacks standardisation, and proper use therefore requires care and experience. Eric Patterson and Mike McCain, who have been credited with independently 'inventing' papercrete (they called it 'padobe' and 'fibrous cement'), have both contributed considerably to research into machinery to make it and ways of using it for building.

Contents • • • • • • • Manufacture [ ] The paper to be used can come from a variety of sources, including,,,. A mixer is used to pulp the mix. Depending on the type of mixer, the paper may be soaked in water beforehand. Standardization and commercial acceptance [ ] As of 2007, papercrete lacks approval from the. This limits its range of use within the city limits of most incorporated cities where building codes apply. It is not used as a load-bearing wall where building codes apply.

However, its strength in model structures has been proven, and homes and small commercial buildings are being constructed. There is little or no evidence of its long-term durability at present. In these small building projects, papercrete is being used as an in-fill in conjunction with or other load-bearing elements. Papercrete gets its name from the fact that most formulas use a mixture of water and cement with cellulose fiber. The fiber is usually acquired from recycled newspaper, lottery tickets and phone books.

The mixture has the appearance and texture of oatmeal and is poured into forms and dried in the sun, much like the process for making. Dried papercrete has very low strength, but fails by slow compression (due to the large air content and hence compressibility) rather than in a manner. Concrete and wood (though dry soft wood can be as high as R-2 per inch, high moisture content reduces this value markedly.) are not known for their insulating qualities; however, papercrete also provides good insulation. Papercrete's is reported to be within 2.0 and 3.0 per inch (2.54 cm); papercrete walls are typically 10 to 12 inches thick (about 25–30 cm). Unlike concrete or adobe, papercrete blocks are lightweight, less than a third of the weight of a comparably-sized adobe brick. Papercrete is mold resistant and has utility as a sound-proofing material.

Research tests into papercrete have been carried out by Barry Fuller in Arizona and Zach Rabon in Texas. Fuller directs government-funded research on papercrete through the. He is also head of a subcommittee for the, and it is his goal to set standards that will lead to acceptance of the product within the architectural community and commercialization of the product, especially for affordable housing. Structural tests have been completed on several papercrete formulas and Fuller claims the compressive strength of papercrete to be in the 140-160 psi range (0.96 - 1.1 MPa), while others like Kelly Hart claim 260 psi (1.7 MPa). For comparison, the compressive strength of concrete ranges from 15 MPa to over 70 MPa (2200 - 10000 psi) depending on the application. A more useful measure of papercrete's properties is its - i.e.

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