Reciclado de hormigón fresco mediante el uso de adición pelletizante

C. SCHUST; M. RAMOS; P. M. STEFANI

Revista Hormigon

Asociación Argentina de Tecnología del Hormigón

Año: 2022 vol. 61 p. 72 - 87

Returned fresh mix concrete to the processing plant is an economic and environmental problem. About 2% of concrete production returns to the plant and, in most cases, is largely disposed of as waste material. The production of blocks, crushed aggregates or the separation of their main components are some of the alternatives reported for recycling. Recently, a new technology based on two-component powder additive has been developed, allowing the fresh returned concrete to be easily converted into an artificial aggregate, which can be incorporated into the production of concrete. In this paper, the properties of pelletized aggregates (AP) obtained from two concrete formulations with different maximum nominal natural aggregate size (AN) were studied. Also, concrete mixtures that had different levels of replacement of AN by AP in the formulation were evaluated. In the formulations with partial replacement of AN by AP, a 20% reduction in the compressive strength was observed compared to the control sample, even for very high percentages of substitution (60%). Despite the decrease, AP-based concretes comply in all cases with the resistance requirements and allow to revalue an industrial waste and take care of the environment.