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The effectiveness of limestone sand fines (material finer than 0.063 mm) in controlling durability performance of slag cement concrete was investigated in an experimental program.
In Part I, results show how the geology of the river and CDW recycled sands and the "total material finer than 75 μm" parameter can be correlated in order to explain the properties of mortars, as the cement content is kept constant.
The material finer than 75 μm, which represents the dust in the scoria, was tested according to ASTM C-117 (ASTM C117 2004).
Whatman No. 54 filter paper at the base of the Büchner funnel was used to trap material finer than 20 microns.
The material with an average density of 1.15, taken from the main pit of the quarry showed an average proportion of material finer than 75 μm, ranging between 0.4 and 0.6%.
The investigation indicated that a voluminous deposit of scoria located at a greater depth satisfied the ASTM C-33 requirements for both the range and average proportion of material finer than 75 μm.
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Using filler materials finer than 0.125 mm is quite effective on the fresh state properties, strength and durability of self-consolidating concretes.
The method takes into account two parameters for the mix design of mortars: the "aggregates and plasticizing materials to cement ratio" and "the total materials finer than 75 μm" in the dry mortar.
The mix design method of mortars takes into account two parameters: the "aggregates and plasticizing materials to cement ratio" and "the total materials finer than 75 μm" in the dry mortar.
The results show that the parameters "total materials finer than 75 μm" and "aggregate to cement ratio" can be used for the mix design of mortars with recycled CDW aggregates.
The structure of the low rubber content materials was significantly finer than that of the high rubber content materials, with the transition occurring at 2% rubber.
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