Biocimentação de um solo arenoso com recurso a enzimas: efeito de diversos fatores
DOI:
https://doi.org/10.24849/j.geot.2017.141.01Palavras-chave:
Bioestabilização, biocimentação, precipitação de carbonato de cálcio, enzima ureaseResumo
Neste trabalho apresentam-se os resultados de uma investigação laboratorial que visa analisar os ganhos de resistência e rigidez de um solo arenoso, através da precipitação de carbonato de cálcio (CaCO3) por via enzimática, com base na adição de uma solução estabilizadora composta por água, ureia, cloreto de cálcio e a enzima urease. Inicialmente a eficiência da metodologia é analisada em tubos de ensaio com a determinação da massa de CaCO3 precipitada, sendo posteriormente testada em provetes de solo, com base em resultados de ensaios de compressão não confinada. São analisados os efeitos da concentração de enzima urease e do tempo de cura, no ganho de resistência e rigidez do solo estabilizado. Constata-se com o aumento da concentração de urease (até 4 kU/L) e do tempo de cura (até 7 dias) um significativo aumento de resistência e rigidez do solo. Ensaios de raios-X e imagens de microscópio eletrónico confirmam a precipitação de CaCO3.
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