Preliminary communicationIn order to examine the differences in chemical composition and the possibility of using mine tailings in mortar and concrete production, samples were taken from the landfill and directly from the production. Tailings test results showed no pozzolanic activity and that its application in concrete can be only a partial replacement of aggregate. This paper presents the possibility of using tailings in self-compacting concrete made with Portland cement and sulphate resistant cement. Concrete specimens in which the aggregate fraction 0/4 mm was replaced with 10 and 20 % of tailings were examined. The resistance to freezing and thawing with and without de-icing salts is used as an indicator of concrete durability. Keywords: CEM I; CEM III; durability; self-compacting concrete; tailings Utjecaj jalovine i vrste cementa na trajnost samougrađujućeg betonaPrethodno priopćenje Da bi se ispitala razlika u kemijskom sastavu i mogućnost primjene jalovine iz rudnika u proizvodnji žbuke i betona uzeti su uzorci s deponija i direktno iz proizvodnje. Nijedan uzorak nije pokazao pucolansku aktivnost. Iz tog razloga, ovaj materijal je moguće koristiti samo kao dkelimičnu zamenu za agregat. U ovom radu je prikazana mogućnost uporabe jalovina u samougrađujućem betonu pripremljenim s portland cementom i sulfatno otpornim cementom. Ispitivani su betonski uzorci u kojima je frakcija agregata 0/4 mm zamijenjena s 10 i 20 % jalovine. Kao pokazatelj trajnosti betona uzete su otpornosti prema zamrzavanju i odmrzavanju sa i bez soli za odmrzavanje.

Inherent uncertainty associated with the selection of input parameters to various geotechnical analyses often results in the likelihood of failure being a dominant topic in the discussion of risk associated with geotechnical assets. As a result, embankment failure is the default risk scenario driving ongoing management of tailings storage facilities (TSFs). This commonly applied approach is inefficient as it drives resource intensive TSF management and limits scope for a risk-based approach. However, many TSFs operate with several layers of controls in place. Therefore, assessment of risk with consideration of these controls would promote greater efficiency in TSF management. A fit for purpose approach will be discussed that demonstrates how risk can be utilised as the foundation for the development of a management framework for a single or portfolio of TSFs. This approach focuses on the identification and monitoring of controls, based on the understanding that hazards impact when the controls put in place to manage them fail. It is necessary to build such an approach with the full application of risk principles, which will be introduced by a specialist in corporate risk. Topics covered include a brief history of risk, importance of control effectiveness in scenario selection and risk evaluation and communicating value at risk to drive resource allocation. It is hoped that this discussion and presentation of simple examples allows risk concepts to be better applied to the design and management of geotechnical structures.

The paper presents and analyzes the results of testing the properties of cement stabilized mixtures of reclaimed asphalt pavement (RAP) and crushed stone aggregate (CSA). Tests were carried out on reclaimed asphalt pavement and crushed stone aggregate mixtures with varying RAP content (0%, 20%, 40%, 60% and 80%), as well as with a varying addition of cement (3%, 5% and 7%). The purpose of these tests was to determine the optimal proportion of recycled asphalt pavement in a mixture with crushed stone aggregate, and the optimal addition of cement as a hydraulic binder. Furthermore, the aim was to determine physical-mechanical parameters: the indirect tensile strength (Rt) and the dynamic modulus of elasticity (E), which are applied in pavement design during the process of cold recycling. On the basis of the obtained values, categorization of the stabilized mixture was carried out according to the standard EN 14227-10: 2006, which continues to be applied in the design of pavements. The maximum proportion of recycled asphalt in the stabilized mixture was determined as being up to 60%; the stabilized mixture was categorized into the "T1" and "T2" categories-gravelly soils.