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ISAIA, G. C. Mineral additions in high-performance concrete : from waste to product. In: CIB SYMPOSIUM ON CONSTRUCTION E ENVIRONMENT: THEORY INTO PRACTICE, 2000, São Paulo. Anais… São Paulo, 2000.
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Abstract

The growth of the world’s population and the growing demand for new buildings and infrastructure facilities present us with the prospect of a higher cement consumption, specially in the form of more durable concrete structures. However, the environmental impact caused by the increase in the extraction of natural resources and higher CO2 emissions has given rise to the search for more efficient, environmentally-friendly constructions. To address these needs, high performance concrete has been employed to increase the durability and economic service life of slender structures, to decrease the specific energy consumption and to reduce the environmental impact of these activities.. This resistance is produced by the use of one or more mineral additions such as pozzolans or slags, which are usually polluting by-products in the same environment. This work describes the retrospect on the relationship between energy consumption, environmental impact and economic cost of concrete structures and the role of high performance concrete in the production of more efficient and durable constructions. A case study of 12 mix proportions with binary and ternary mixtures of fly ash, rice husk ash and silica fume, with cement substitutions of up to 50% in mass is presented. The mixtures that presented lower cost and energy consumption were those with higher pozzolan content and lower cement content that, at the same time, presented the best performances in terms of durability. It was found that high performance concrete is an appropriate material for more durable constructions and more environmentally friendly due to its lower social and economical costs. So, mineral additions in HPC structures are mandatory and do not play a waste role but a commodity one.
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