Rigid road pavements of cement concrete for highways

Number: Issue 18(2018)
Section: Construction and civil engineering
The page spacing of the article: 119-127
Keywords: rigid pavements, highways, chemical additives, strength, impact resistance, water resistance, physical and mechanical characteristics.
How to quote an article: Andrii Mishutin, Іrina Solonenko, Аnna Leonova. Rigid road pavements of cement concrete for highways. Dorogi і mosti [Roads and bridges]. Kyiv, 2018. 18. P. 119-127 [in Russian]


Odesa State Academy of Civil Engineering and Architecture, Odesa, Ukraine
Odesa State Academy of Civil Engineering and Architecture, Odesa, Ukraine
Odesa State Academy of Civil Engineering and Architecture, Odesa, Ukraine


Introduction. Analysis of scientific publications shows that cement concrete pavements for highways are widespread in the most developed countries of the world. This pavement has high physico-mechanical and operational characteristics, provides a high contrast of traffic flows, etc. The main disadvantage of cement concrete pavements is a significant time of their hardening. This leads to a temporary withdrawal from the operation of the highway’s section, as well as an increase in material and financial costs.
Problem statement. Reducing the time when the road is in a non-operating state can be achieved through the use of quick-hardening materials of pavement. Currently, the main methods for accelerating the hardening of concrete are: moisture-heat treatment (steaming), vacuuming, the use of chemicalcement hardeners, etc. The most common way to accelerate hardening is a heat and humidity treatment but it requires the appropriate equipment and significant power consumption. This method of acceleration is usually used in the factory. Vacuum processing of concrete is not widespread due to its complexity. The easiest way to acceleratehardening is the use of chemical hardeners. This method allows reducing the the time of concrete setting without the use of expensive equipment and energy sources.
Purpose. Development of a method for selecting a rational composition of a concrete mix for fast-hardening of rigid pavement taking into account the quality of the material and due to the introduction of additives and fiber into its composition.
Materials and methods. The studies were carried out with cement concrete consisting of: Portland cement, crushed stone, sand, plasticizer, hardener and fiber. The studies were conducted by the method of factor analysis with a preliminary planning of experiments. The following factors were taken as impact factors: plasticizer, hardener and fiber. The obtained samples were tested for: compressive strength, flexural strength, water resistance, impact resistance.
Results. The studies have shown that the introduction of a hardener into the concrete mix reduces the setting time by more than in 30 times and the end of setting time - by more than in 15 times. The reduction in compressive strength does not exceed 3%. Introduction of concrete plasticizing additive together with the polypropylene fiberto the composition: increases the compressive strength by 10 %, flexural strength - more than by 55 %, water resistance - by 33 % and impact resistance - by 17 %.
Conclusions. Reducing the time of hardening of the material for rigid pavements without compromising the physico-mechanical and operational characteristics can be achieved by introducing into its composition a rational amount of plasticizer, together with polypropylene fiber and hardener.


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