Reforço de solo-cimento com fibra de cânhamo para camadas de base e sub-base de pavimentos rodoviarios
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2023
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A construção das camadas inferiores de pavimentos rodoviários frequentemente implica custos substanciais, tanto do ponto de vista económico e ambiental. Neste contexto, foi desenvolvida uma investigação laboratorial sobre a estabilização de uma areia argilosa com elevada plasticidade utilizando cimento e reforço através de fibras de cânhamo, visando reduzir tais custos. Foram produzidos provetes de solo estabilizado com cimento e reforçados com fibras de cânhamo, com teores de 0,1% e 0,2%, para avaliar o desempenho mecânico. Ensaios de compressão uniaxial e compressão diametral foram realizados após 1, 7 e 28 dias de cura, juntamente com ensaios de California Bearing Ratio (CBR), com e sem embebição. Os resultados indicam que a adição de fibras de cânhamo resultou numa melhoria nas propriedades mecânicas do solo em comparativamente ao o solo estabilizado apenas com cimento. Houve aumentos na resistência à compressão e tração indireta. Quanto aos ensaios de CBR, de modo geral, observou-se um aumento no desempenho. Desta forma conclui-se que a aplicação de fibras pode ser uma vantagem, tanto ao nível da engenharia como ao nível do desenvolvimento sustentável, sendo a mesma uma alternativa viável e mais ecológica para a execução das camadas de base e sub-base de pavimentos. Palavras chave: Desempenho mecânico; Estabilização de solo; Fibras de cânhamo; Pavimentos rodoviários; Sustentabilidade
The construction of road pavements often involves substantial costs, both from an economic and environmental point of view. In this context, laboratory research was carried out into the stabilization of clayey sand with high plasticity using cement and reinforcement with hemp fibres, with the aim of reducing these costs. Soil specimens stabilised with cement and reinforced with hemp fibre, at 0,1% and 0,2% ratios, were designed to evaluate their mechanical performance. Uniaxial compression and diametrical compression tests were carried out after 1, 7 and 28 days of curing, along with California Bearing Ratio (CBR) tests, with and without soaking. The results show that the addition of hemp fibre resulted in an improvement in the soil's mechanical properties compared to soil stabilised only with cement. There were increases in compressive strength and indirect tensile strength. As for the CBR tests, in general, there was an increase in performance. In this way, it can be concluded that the application of fibre can be an advantage, both in terms of engineering and sustainable development, as it is a viable and more environmentally friendly alternative for the execution of the base and sub-base courses of pavements. Keywords: Hemp fibres; Soil stabilisation; Sustainability; Road pavements; Mechanical performance
The construction of road pavements often involves substantial costs, both from an economic and environmental point of view. In this context, laboratory research was carried out into the stabilization of clayey sand with high plasticity using cement and reinforcement with hemp fibres, with the aim of reducing these costs. Soil specimens stabilised with cement and reinforced with hemp fibre, at 0,1% and 0,2% ratios, were designed to evaluate their mechanical performance. Uniaxial compression and diametrical compression tests were carried out after 1, 7 and 28 days of curing, along with California Bearing Ratio (CBR) tests, with and without soaking. The results show that the addition of hemp fibre resulted in an improvement in the soil's mechanical properties compared to soil stabilised only with cement. There were increases in compressive strength and indirect tensile strength. As for the CBR tests, in general, there was an increase in performance. In this way, it can be concluded that the application of fibre can be an advantage, both in terms of engineering and sustainable development, as it is a viable and more environmentally friendly alternative for the execution of the base and sub-base courses of pavements. Keywords: Hemp fibres; Soil stabilisation; Sustainability; Road pavements; Mechanical performance
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CIVIL ENGINEERING, CONSTRUCTION, ROAD SURFACE, SUSTAINABILITY, SOIL MECHANICS, STRENGTH OF MATERIALS, MESTRADO EM ENGENHARIA CIVIL, ENGENHARIA CIVIL, CONSTRUÇÃO CIVIL, PAVIMENTOS RODOVIÁRIOS, SUSTENTABILIDADE, MECÂNICA DOS SOLOS, RESISTÊNCIA DOS MATERIAIS, Mestrado em Engenharia Civil