Abstract
The paper presents results of tests of lightweight concrete made with copper slag waste material as fine aggregate (fraction 0 – 2 mm) and two types of light aggregate (fractions > 2 mm). Six series of concrete with three w/c ratios (0.50, 0.55 and 0.60) and two variants of cement content (200 kg/m3 and 300 kg/m3) were manufactured. Reference concretes were also prepared in which copper slag waste was replaced by the same mass of river sand. To maintain similar densities of mixtures with copper slag in comparison to those with sand mutual proportions of both lightweight aggregates were modified. On concrete specimens compressive strength was tested as well as the open porosity was determined by drying to stable mass at 65°C. The concrete bulk density in saturated and dried state was also determined using hydrostatic weighing. The obtained results were compared with the results of the reference concrete tests. Results have shown that replacing sand with copper slag waste in lightweight concrete does not negatively affect their strength but may slightly increase their porosity.
Highlights
The use of copper slag waste in the production of concrete can be a part of the sustainable development strategy
The aim of this work is to compare selected mechanical and structural properties of Lightweight aggregate concrete (LWC) manufactured with two kinds of different fractions of lightweight aggregate (Certyd and expanded clay aggregate) and copper slag waste as sand substitution
Increasing w/c ratio changes the differences in compressive strength between similar series in favour of those with copper slag waste
Summary
The impact of high temperature on the strength of the lightweight concrete with aggregates fully saturated with water showed strength losses that were comparable to those observed in the concrete with standard aggregate 20 Another advantage of the material is wide use of waste materials in the production of lightweight aggregates [21,22,23] including hazardous waste which is difficult to dispose of in any other way, such as petroleum soaked absorbents [24] or industrial waste containing heavy metals [25]. The aim of this work is to compare selected mechanical and structural properties of LWC manufactured with two kinds of different fractions of lightweight aggregate (Certyd and expanded clay aggregate) and copper slag waste as sand substitution. Due to the difference in density of sand and copper slag, in order to obtain concretes of similar density, the same mass share of both fine aggregates and different mutual proportions of light aggregates in mixtures were assumed. the amount of additional water due to the difference in absorbability of both light aggregates has been corrected
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