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CCAT alternative building materials testing

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Spring Semester 2018 the CCAT Green Building class performed several weathering and strength tests on a set of alternative building materials. The following is the results of those tests.

Alternative Building Materials[edit]

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Materials tests were performed on several masonry and concrete alternative building materials, these included: cob, hempcrete, and papercrete. The recipes for each material are as follows:

Cob[edit]

  • 1 part clay
  • 1 part sand
  • 1 part straw

Several mixes of cob were used with slight variations in proportion of clay sand and straw, as well as both course and fine sand. The results presented represent an average of multiple mixes.

Hempcrete[edit]

The hempcrete built in the Spring 2018 class failed to remain structurally sound after curing, so hempcrete from a previous semester was used instead. The recipe for this hempcrete is unknown, but a generic hempcrete recipe is as follows:

Hempcrete Binder

  • 4 parts Hydrated Lime
  • 1 part Portland Cement

Hempcrete

  • 4 parts Hemp
  • 1 part Hempcrete Binder

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