Abstract
The paper focuses on investigating the effect of impregnation of recycled concrete aggregate on the mechanical and durability properties of concrete using this aggregate. Cement paste, limewater and diluted water glass were used to impregnate the aggregate. Both a single impregnation and a double impregnation using two different solutions were carried out. A total of four groups of concrete series, with two values of w/c ratio (0.45 and 0.60), were made. Concrete made using the impregnated aggregate was tested and the results were compared with those of concrete made using untreated recycled aggregate of the same kind. The results indicate that impregnation of aggregate improves the mechanical properties of concrete in many cases but reduces its resistance to cyclic freezing and thawing. Furthermore, in the case of impregnation with two solutions, the order in which the impregnants are applied influences the effect obtained. Using the results received, the impregnation methods were ranked in order from best to worst. The best impregnation method proved to be with cement paste, followed by diluted water glass, while the worst results were obtained with limewater, followed by diluted water glass.
Highlights
The growing environmental awareness of societies is forcing changes in the economy leading to greater use of waste and secondary raw materials
The reason for the poorer parameters of recycled aggregate is the high proportion of mortar that is derived from the concrete from which it was obtained
The share of mortar is high in the case of aggregate of fractions below 4 mm, such aggregate is often not used, attempts are made to apply it after appropriate treatment [16]
Summary
The growing environmental awareness of societies is forcing changes in the economy leading to greater use of waste and secondary raw materials. Aggregates from waste materials such as metallurgical slags [1,2,3,4], recycled asphalt pavements [5,6], recycled ceramic [7,8], and recycled brick [9,10], as well as aggregates obtained from concrete recycling are being used [11,12]. The latter are probably the most commonly utilized. The share of mortar is high in the case of aggregate of fractions below 4 mm, such aggregate is often not used, attempts are made to apply it after appropriate treatment [16]
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