Abstract
O presente estudo visa discutir o efeito dos incorporadores de ar no comportamento mecânico e de durabilidade de elementos de concreto moldados no local. O experimento foi desenvolvido com a confecção de amostras com 4 diferentes massas específicas (1500kg/m3, 1700kg/m3, 2000kg/m3 e 2300kg/m3) e 3 relações água/cimento (0,63 – 1:5, 0,50 – 1:4, 0,43 – 1:3), ensaiados para determinação da resistência à compressão, absorção de água, índice de vazios e profundidade de carbonatação. Os resultados obtidos apontaram quedas expressivas no comportamento e indicadores de proteção da armadura (absorção de água e carbonatação), o que confirma a necessidade de utilização de meios adicionais mitigadores para a estrutura (pinturas protetoras, barras inoxidáveis), sob pena da perda prematura da durabilidade ao longo da sua vida útil.
Highlights
Concrete made from Portland cement is the most important structural material in civil construction today
It becomes necessary to discuss the thermal discomfort caused by the use of this type of material, which can be minimized with concrete having lower specific mass obtained with the incorporation of air entrainment additives
The current study evaluated, through experimental development, concrete having different levels of specific mass and its consequences on the principal mechanical properties and cement qualities to prevent water entering into the interior of the structure
Summary
Concrete made from Portland cement is the most important structural material in civil construction today. It becomes necessary to discuss the thermal discomfort caused by the use of this type of material, which can be minimized with concrete having lower specific mass obtained with the incorporation of air entrainment additives This technique, can lead to a decrease in both mechanical performance and in protection against the entry of water and aggressive agents into the structure. For wall systems made from light foamed concrete, there are standards dating from 1992 (ABNT NBR 12645 and NBR 12646, 1992), which are currently under review, with important discussions taking place regarding the improvement in thermal performance and the loss of reinforcement protection provided by the concrete itself In this context, the current study evaluated, through experimental development, concrete having different levels of specific mass and its consequences on the principal mechanical properties (resistance to compression) and cement qualities (water absorption, void index, carbonatation depth, etc.) to prevent water entering into the interior of the structure
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