Contribution to the Study of the Durability of Rubberized Concrete in Aggressive Environments

Abstract

Today, much of the world’s waste, in particular used tires, is accumulating as a potential source of major environmental and economic problems. In order to better preserve the environment, and in the face of changes in the legislation in force, many recovery actions have been carried out especially in the field of building materials.The present research aims to contribute to the study of the mechanical properties and durability of concretes based on rubber aggregates. To achieve this objective, we have contemplated incorporating therein amounts of rubber granules according to different volume substitution percentages being 10%, 17.5%, and 25%. A comparison of the results with a control concrete has been established.The obtained results make it possible to demonstrate that the substitution of a percentage of sand by rubber granules decreases the mechanical strengths and increases the expansion in water. On the other hand, it improves the resistance to attack from H2SO4, Na2SO4, and seawater. The latter is evaluated by the loss and gain in mass as well as the loss in mechanical resistance, especially in the long term (more than 90 days), decreases drying shrinkage, thus decreasing microscopic cracks and providing better durability.

Influence of chloride and sulfate solution on the long‐term durability of modified rubberized concrete

“…The expansive nature of MgSO 4 attack products causes volume or dimension instability, as well as a loss of concrete mechanical characteristics. A similar pattern of mass loss results is found in the previous research 15,17,60,61 …”

“…For a long period, RuC specimens exhibit a stronger resistance to sodium and magnesium sulfate attacks. A similar pattern of results of compressive strength loss is found in the previous research 15,17,60,61 …”

“…A similar pattern of results of compressive strength loss is found in the previous research. 15,17,60,61…”

Influence of NaOH treatment of rubber aggregates on the durability properties of rubberized mortars

“…This loss in mass decreases with the increase in the substitution rate of sand by rubber aggregates. This same tendency has been observed by Kechkar et al [29]. For example, at the age of 90 days, we notice a loss in mass of 22.98% for reference mortar (M) against losses in mass of 20.18% ; 17.93% ; 12.76% ; 15.43% ; 13.12% and 9,38% for rubber mortars RM10% ; RM17,5% ; RM25% ; RMT10% ; RMT17,5% and RMT25% respectively.…”