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Mechanical and durability properties of compressed stabilized earth brick produced with cassava wastewater

2021; Elsevier BV; Volume: 44; Linguagem: Inglês

10.1016/j.jobe.2021.103290

2352-7102

Jônatas Macêdo de Souza, Ricardo Eugênio Barbosa Ramos Filho, João Batista Duarte, Vamberto Monteiro da Silva, Sóstenes Rodrigues do Rêgo, Luciana de Figueirêdo Lopes Lucena, Wilson Acchar,

Recycling and utilization of industrial and municipal waste in materials production

Cassava wastewater (CW) is a residue from the production of flour which contains starch, a biopolymer, in its composition. This paper mainly highlights the use of this effluent in Compressed Stabilized Earth Brick (CSEB) instead of potable water. Compressive strength, water absorption, durability by wetting-drying cycles, X-ray diffraction, and scanning electron microscopy tests were performed to evaluate the mechanical and durability properties of the CSEBs. Compositions with CW showed higher mean results than those produced with potable water for the same cement proportions of 6% and 12%. CSEB with CW and 12% cement showed the highest compressive strength (4.9 MPa) and lowest water absorption (12.91%) at 49 days. In addition, it showed the lowest mass loss (0.3%) after six wetting-drying cycles. All formulations met the Brazilian CSEB standards. The results are promising and demonstrate the technical feasibility of bricks produced with CW.