Abstract
ABSTRACT This paper investigates how the use of construction and demolition waste can affect the durability and affect the mechanical performance of concrete. tests such as compressive strength, tensile strength by diametral compression and modulus of elasticity were performed. Regarding durability, tests such as water immersion, void content and specific mass, water absorption by capillarity, electrical resistivity, the penetration depth of chloride ions, accelerated carbonation and a test evaluating the synergic effect of carbon dioxide and chloride ion penetration were performed. The coarse natural aggregate was replaced with coarse recycled aggregate in concrete mixes at the following ratios: 30%, 50%, 70%, and 100%. The results indicate that the parameters of the concrete produced with recycled aggregate, especially up to 50% replacement level, meet the concrete quality requirements, regarding the mechanical properties and durability.
Highlights
The economic development and the growing urbanization process has been causing serious damage to the environment and jeopardizing sustainability
The results indicate that the parameters of the concrete produced with recycled aggregate, especially up to 50% replacement level, meet the concrete quality requirements, regarding the mechanical properties and durability
The compressive strength decreased as the recycled aggregate replacement percentage increased, with the lowest value obtained for the 100RCC concrete
Summary
The economic development and the growing urbanization process has been causing serious damage to the environment and jeopardizing sustainability. Exploitation of resources, nonrenewable resources, by the construction industry generates millions of tons of construction waste every year. These materials could and should be reused in new constructions; countries that do not have waste management and processing plans for such materials, direct them to landfills [38]. The magnitude of the problem is such that for annual consumption of 37.5 billion tons of aggregates [14] about 3 billion tons of construction wastes are generated [2]. According to data from the United States Environmental Protection Agency (EPA), approximately 548 million tons of construction and demolition waste are generated annually in the United States, about 830 million tons in the European Union, 200 million tons of concrete waste in China, 29 million tons in Taiwan and Hong Kong, totaling 1593 million tons of construction and demolition waste [44, 48, 49]
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