The influence of tailings and cement type on durability properties of self-compacting concrete

Abstract

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.

Recycling of Mine Wastes in the Concrete Industry: A Review

“…A UCS of 58 MPa was reached with a w/c of 0.7. Other researchers [26,48,49] confirmed that the use of IOT may cause a decrease in concrete workability and an increase Also, the metric analysis of the literature based on Scopus data shows multiple works dealing with the recycling of various mine waste types in the concrete industry that are plotted according to the year of publication in Figure 5, and it shows a higher number of publications in terms of all of mine waste types this last decade. In addition, the recycling of IOT in concrete has been extensively studied, according to the number of publications, while publications dealing with the recycling of phosphate mine waste in concrete are less common.…”

“…A UCS of 58 MPa was reached with a w/c of 0.7. Other researchers [26,48,49] confirmed that the use of IOT may cause a decrease in concrete workability and an increase in w/c ratio due to the high water absorption of IOT [50], which is related to the particles' surface texture.…”

“…A UCS of 58 MPa was reached with a w/c of 0.7. Other researchers [26,48,49] confirmed that the use of IOT may cause a decrease in concrete workability and an increase…”

“…The influence of the use of this type of waste in concrete on the durability and properties of SCC has been discussed by Jankovic et al [26]. The authors proceeded to a partial replacement of FA by 10% and 20% because test results showed no pozzolanic activity.…”

Properties of Self-compacting Concrete Produced with Biomass Wood Ash

“…There is a small number of studies about the use of wood as a replacement for fine aggregate or mineral additive [23][24]. Numerous studies have shown that waste powders with low pozzolanic activity can be successfully used as mineral admixtures for production of selfcompacting concrete [25][26][27][28][29]. Elinwa et al [24] studied the impact of sawdust ash on the properties of SCC in fresh stated and concluded that adding the sawdust ash reduces workability of concrete, but that the increase of the amount of superplasticizer can achieve a satisfactory workability.…”