Avaliação da durabilidade de concretos de alto desempenho frente ao ataque químico com vistas ao ambiente de ETE

Abstract

In Systems Sanitation, corrosion of concrete caused by attacks is a very common type of deterioration. Within this context, there is a search for such materials that minimize environmental impacts and improve the performance of structures from the perspective of durability, such as the use of high-performance concretes with high levels of mineral additions, the application of crystallizing additives, the use of composites advanced cementitious and, more recently, the development of special cements. The present work addresses the question of the study of more durable materials compared to chemicals, in particular, those arising from Sewage Treatment Plants, as it is a highly aggressive environment for cementitious materials. The use of different technologies and materials has contributed to increase durability in the face of aggressive agents that damage concrete structures, by reducing permeability and increasing mechanical strength. There are many ways to contribute to the increase in the durability of the structures, however, this work will focus on the use of High Performance Concrete (HPC), with the use of waterproofing by crystallization and active silica, in a similar content to amorphous silica. present in SCM, in comparison to conventional concretes, with comparison of two types of cement. Tests were carried out in order to verify the loss of mass and volume variation, water absorption by capillarity and also the tensile strength and compression test. The results show the high efficiency of the strokes without additions, which have better performance in absorbing water without compromising the resistance to compression, highlighting the strokes acquired only with CPIV and CPII-F cement, with low water / cement ratio.