Alkali Activated Concretes Mix Design Using Red Mud as an Active Aggregate

Abstract

The object of the study is compositions of common alkali activated concretes using red mud as an active aggregate. The main problem when working with red mud is its chemical composition and high specific surface area, which quite negatively affect the properties of building materials.The study used modern methods of physico-chemical analysis to obtain results. Determination of physical-mechanical and special (strength, frost, carbonation, corrosion resistance, radiation resistance, durability, own shrinkage deformation) properties of the tested concrete mixtures and alkaline concretes with high red mud content were carried out according to standard methods. The world's experience in dealing with red mud is also taken into account.Optimal indices of the functional properties of concrete with the use of red mud have been obtained, which makes it possible to confirm the durability and environmental friendliness of such material. This is due to the fact that the reliability of the immobilization of alkaline concretes meets the requirements of the standard, which indicates that the concretes developed are environmentally friendly.Radiation resistance of alkaline concretes based on red mud is conducted and it is determined that this concrete with a mud content of up to 40 % (by weight of concrete) belongs to Class I according to the classification of building materials and can be used for all types of construction without restrictions.This provides an opportunity to expand the nomenclature of building materials and obtain a completely new product made on the basis of man-made raw materials, which significantly reduces the price and increases the demand for products. Especially in comparison with other similar products made on natural raw materials