Study of the properties of the Echerhirhu-Block made with Opuntia ficus mucilage for use in the construction industry

This research shows the results of mixtures of materials used for making Echerhirhu- Block (mud block, in purépecha) that complies with quality standards, as possible replacement for conventional bricks. The product was made from soil mixtures, cellulose (recycled paper), and Opuntia ficus extract (mucilage) used as binder. The process was carried out by grinding soil and waste paper down to a particle size smaller than 3 mm. It was hydrated with water, mixed, its pH was modified through the addition of lime. This led to a stabilization that contributed to the cementation of the particles. Subsequently, mucilage was added and the components were homogenized until a moldable paste was obtained. This was emptied into molds and left to dry for 9 days. Physical tests were performed to determine the properties of the bricks. Compressive strength was determined and compared with some commercial products according to the NMX-C-404-ONNCE-2012 standard. The optimum sample presented a compressive strength of almost 76 kg/cm2, while conventional bricks for non-structural purpose showed a maximum compressive strength of 60 kg/cm2. Moreover, a 17% water absorption decrease and a weight reduction up to 25% were observed, at a 10% lower cost since no firing is required.