Study to achieving a class of road concrete with slag powder addition at the cement mass and substitution with artificial aggregates

摘要

In order to notice the influence of slag in the form of powder used as an addition to the cement mass and the substitution of natural aggregates with artificial aggregates from crushed and sorted slag, first of all, mixtures of mortars were made for a reduced volume of material. In the mixes design of new road concrete, we have taken into account the results obtained on the most representative mortar mixes. We chose mixtures of mortar with 15% addition of slag powder in the cement mass and those in which the 0/4 mm natural aggregate was substituted in a ratio of 20%, 40%, and 60% with artificial aggregates of crushed and sorted slag from the byproducts stockpiles resulting from the process of obtaining the cast iron in the furnaces. The intended objective is to obtain a BcR 5.0 road concrete class that can be used in all categories of traffic. From the results obtained on mortar and concrete mixtures, it can be seen that compressive strengths and flexural tensile strengths remain close both in mortars and in concretes. Also, the results show that the control mixture falls into the BcR5.0 road concrete class and the new mixtures are very close to it.