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Title: Concretes with Low Paste and Low Cement Content Durability and Sustainability

Author(s): Edgardo Becker, Patricio Corallo, Juan Domínguez, Cristian Ríos, Ismael Gea, and Javier Cañari

Publication: Symposium Paper

Volume: 326


Appears on pages(s): 52.1-52.10

Keywords: accelerated carbonation; compressive strength, durability; dynamic elastic modulus; low cement content; low paste content; rapid chloride permeability test; water absorption

DOI: 10.14359/51711035

Date: 8/10/2018

The first aim of this paper is to design concretes with minimum paste and cement contents, having strengths and workability comparable to conventional concretes. On one hand, an extensive work on packing of many available types of aggregates, with different shapes and particle size distributions, has been done to find out combinations that lead to minimum paste contents. As for the concrete, composition of paste was adjusted in order minimize cement and paste content for a given workability, a specified compressive strength and a certain aggregate combination. The second aim of this paper is to prove that, despite not complying with the minimum cement content indicated in construction codes, durability performance of those special concretes is better or, at least not worse than for conventional concretes with similar workability and compressive strength, showing that durability specifications should limit the maximum paste content, instead of the minimum cement content.