Abstract
The article is devoted to operational quality control of grainsize composition of cement-concrete road mixtures for use on highways of Ukraine. The results of the experimental research are presented, which testify to the non-conformity of the planned grain composition to the actual production composition, as well as the influence on it of a number of factors that significantly affect the quality of the mixture and the durability of cement concrete.
Highlights
Road cement concrete used in aggressive environments can be destroyed if the designer or the builder did not take into account the results of the joint action of traffic intensity and axle load increase of road transport, physical and chemical factors
One of the reasons for the destruction of road cement concrete is the poor quality of aggregates, the wrong choice of grain-size analysis, especially the fine aggregate, as well as the ratio between fine and coarse aggregates, which leads to a high void ratio of the mineral aggregate of cement mortar and concrete
We can add to these reasons the wrong choice of chemical additives and unreasonably increased cement costs
Summary
Road cement concrete used in aggressive environments can be destroyed if the designer or the builder did not take into account the results of the joint action of traffic intensity and axle load increase of road transport, physical and chemical factors. One of the reasons for the destruction of road cement concrete is the poor quality of aggregates, the wrong choice of grain-size analysis, especially the fine aggregate, as well as the ratio between fine and coarse aggregates, which leads to a high void ratio of the mineral aggregate of cement mortar and concrete. This increases the amount of free and physically-bounded moisture in concrete and leads to increased mass-volume processes and evaporation of water. The purpose of the paper is to develop a method of grain-size analysis of cement-concrete road mixtures while exercising the operational control over their quality
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