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Production of Filler Aggregate from Waste of Bivalves Molluscs Shells

Journal of Civil Engineering and Architecture 2011年第4期5卷 363-367页

作者： ulisses targino bezerra Fabio Luiz P. Almeida Lucineide Balbino Silva Normando Perazzo Barbosa TiberioA. Passos Danielle G. L. Cavalcante Federal Institute of Paraiba Av. 1°de Maio 720 Jaguaribe Joao Pessoa-PB Brazil Federal University of Paralba Castelo Branco S/N Joao Pessoa-PB Brazil

The work presents an experimental study held with shells of molluscs of the species Anomalocardia brasiliana and Tivela mactroides, commonly found in the Northeast coast of Brazil. A local community living from the collection of these animals was the motivation of the work. This community wishes to install an industry for processing these molluscs; however, as government agencies require making an appropriate allocation of discarded shells, the community needs an environmental project of final destination of waste. Thus, the expectation of the work was to obtain a material to be added to Portland cement to act as filler, and also obtain a limestone that can be used as ink, because the material is composed of 80% calcium carbonate. The shells were ground and passed the sieve 325 mesh （0.044 mm）. The material was characterized by X-ray diffraction and X-ray fluorescence. Mortars specimens were prepared with percentages： 0%, 5%, 10%, 15%, 20% and 30% replacement of Portland cement. Two conditions were analyzed： with shells in a raw and burned state. The obtained results confirm the filler material effect, which suggests its use as a partial replacement of cement. However, due to the short silicas＇s concentration, the pozzolanic effect was not observed.

关键词： Bivalves molluscs shells filler Portland cement mortar

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Ecological implications of twentieth century reforestation programs for the urban forests of São Paulo, Brazil: a study based on litterfall and nutrient cycling

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Ecological Processes 2021年第1期10卷 367-379页

作者： Maurício Lamano Ferreira Marcelo Ferreira Barbosa Eduardo Pereira Cabral Gomes Ana Paula Branco do Nascimento Edgar Fernando de Luca Karina Gonçalves da Silva ulisses bezerra França Plínio Barbosa de Camargo Raffaele Lafortezza Master’s Program in Health Promotion Adventist University of São PauloSão PauloSPBrazil. Master’s Program in Geoenvironmental Analysis University of GuarulhosGuarulhosSPBrazil. Department of Health Faculty of Biological ScienceUniversity Nove de Julho(UNINOVE)São PauloSPBrazil. Institute of Botany(IBT/SP) São PauloSPBrazil. Department of Civil Engineering São Judas Tadeu UniversitySão PauloSPBrazil. Institute of Forestry(IF/SP) São PauloSPBrazil. Centro de Energia Nuclear na Agricultura(CENA/USP) University of São PauloPiracicabaSPBrazil. Prefeitura da cidade de São Paulo(Secretaria do Verde e Meio Ambiente) São PauloSPBrazil Department of Agricultural and Environmental Sciences University of Bari Aldo MoroBariItaly. Department of Geography The University of Hong KongCentennial CampusPokfulam RoadHong KongHong Kong.

The focus of this study was to investigate the wide use of Eucalyptus spp.,an exotic plant with high allelopathic ability,in the reforestation programs of urban parks in São Paulo City,Brazil,over the last *** understand the implications of using Eucalyptus *** the city’s parks,this study aimed to compare nutrient cycling and litter decomposition between a mixed composition of litter(i.e.,native and exotic species)and the litter of a single species(i.e.,Eucalyptus).To accomplish this,newly deciduous leaves were collected from two native and two exotic species that are commonly used in the afforestation of São Paulo as well as from Eucalyptus *** mixed composition of litter yielded a higher dry mass loss and return of macro-and micronutrients to the forest *** decomposition constant(k)values were 0.00322 and 0.00207 g g^(−1) day^(−1) for the mixed composition and Eucalyptus spp.,*** time required for decomposition of 50 and 95%of deciduous material was 215 and 931 days,respectively,and for the mixed litterfall 334 and 1449 days,respectively,for Eucalyptus ***,the mixed litter exhibited greater dry mass loss and nutrient cycling in an urban forest of São Paulo City,since dry mass losses as well as speed and amount of nutrients returned to the forest floor were relatively higher compared to Eucalyptus *** cycling via Eucalyptus *** was less efficient than mixed composition of litter,demonstrating that reforestation programs carried out in the twentieth century using only one species may have had little *** results of this work emphasize the fact that in urban reforestation programs the City of São Paulo must consider the environmental and biogeographic characteristics of the species employed and use high levels of biodiversity,since the city lies in a megadiverse biome.

关键词： Tropical forest Exotic species Nutrient dynamics Ecosystem functioning

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