Abstract
Some durability properties are analyzed in concretes made with a novel method for recycled aggregates concrete (RAC) proportioning, in order to validate it under the Spanish context. Two types of concrete mixes were elaborated; one following the guidelines of the named method, and other based on an adaptation of the method to Bolomey methodology. Two types of recycled concrete aggregates (RCA) were used. RCA replacement for natural aggregates (NA) ranged from 20% to 100%. The 20% was chosen in order to comply with Spanish recommendations. Water penetration under pressure, water absorption and chlorides attack were the studied properties. It is verified that the new method and the developed adaptation results in concrete mixes of better or similar properties to those of the natural aggregates concrete (NAC) and the conventional RAC, saving important amounts of cement.
Highlights
There have been several improvements during these last years towards a sustainable construction
In order to achieve a one dimensional pathway of the water through the samples and to avoid water loss through their lateral surfaces, the specimens were coated with an impermeable paint on their vertical side
For the 0.6 w/c ratio, the results seem to have the same tendency as the 0.45 w/c ratio but after an ANOVA test, the results show no significant difference
Summary
There have been several improvements during these last years towards a sustainable construction. In the construction field, there is a generalized new way of thinking that strives on creating or upgrading processes, inventing new materials, enhancing their properties by making them more environmentally friendly, and so on. Recycling of construction and demolition materials which, in Europe for example, has had an important impact, up to the point of creating regulations and special commissions in order to deal with this. In the case of concrete, which is the most important material in construction [1, 2], some problem arises due to its components and its reusing or recycling. Apart from this, the use of cement, as one of the most important constituents of the concrete, causes more problems due to its production procedure. Maier and Durham [5] stated that Portland cement is the largest contributor to greenhouse gases of all the raw materials used in concrete
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