Reciclagem dos rejeitos da atividade de mariscagem: uso na indústria de blocos pré-moldados de concreto

Abstract

In coastal communities, the extraction of marine resources has been a routine activity, having gone from a balanced and acceptable activity, practiced mainly as subsistence and, also, complementation of family income, to another of greater dimensions of predatory over-exploitation. Both the cultivation and extractive fishing of mollusks has caused environmental impacts related to the inappropriate disposal of shells, which correspond to 80% of the constitution of shellfish. This research, carried out in the municipality of Igarassu in the state of Pernambuco, aims to evaluate the volume of disposal (Reject) of shells irregularly discarded by the marking activity and its environmental impacts, the performance of the replacement of sand and cement by crushed and calcined shell, carrying out tests of resistance to compression, water absorption, voids and specific mass and the economic viability of using shellfish shells, as one of the fundamental components for the manufacture of cement blocks for non-structural masonry and interlocking "paver" for paving. The efficiency of the substitution of sand by clamshell in the proportions of 10, 20 and 30% was verified and within the established limits the replacement of cement by calcined shell in 10%. The production of blocks, using shells, provides a better condition for processing discarded shells, this application would improve the quality of life, reducing the unhealthiness of the place and all the environmental impacts caused by this activity. In addition to qualifying shellfish gatherers and their families, another entrepreneurial activity is to manufacture precast for use in civil construction.