ELEMENTARY LINKS OF LINEAR SPATIAL RHEOLOGICAL MODEL OF ASPHALT-CONCRETE

The article deals with three-demensional mathematical models of the deformation mode of Hook, Newton, Maxwell and Kalvin elements

Historical-geographical researches of environmental-geomorphologic state of the Mizoch hills ravines

Розкрита суть еколого-геоморфологічних досліджень ярів Мізоцького кряжу. Охарактеризована методика історико-географічних досліджень стану яркової мережі, тенденцій та інтенсивності її змін під впливом природних та антропогенних умов і чинників. Проаналізована динаміка стану ярів за останні роки

Свойства асфальтобетонов холодного типа на основе жидких вяжущих различного состава

Исследованы физико-механические свойства жидких битумополимерных вяжущих и холодных асфальтобетонов на их основе. Введение в состав жидких битумов ПАВ катионного типа и добавки полимера приводит к снижению слеживае- мости смесей и повышению длительной водоустойчивости асфальтобетонов. Характерной особенностью холодных асфальтобетонов на основе жидкого битума и битумополимерного вяжущего, содержащих катионное ПАВ, является более высокие значения коэффициентов длительной водоустойчивости до и после прогрева, по сравнению с бетонами на битумах без поверхностно-активного вещества. (The physical and mechanical properties of liquid bituminopolymer binders and cold asphalt concrete on their basis are studied. The introduction of cationic surfactants into the composition of liquid bitumens and the addition of polymer leads to a decrease in the caking of the mixtures and an increase in the long-term water resistance of asphalt concrete. A characteristic feature of cold asphalt concretes based on liquid bitumen and bituminopolymer binder containing cationic surfactant is higher values of long-term water resistance coeffi cients before and after heating, as compared to concrete on bitumens without a surfactant.

GENERAL SOLUTION FOR FOUR –ELEMENT LINEAR VISCOELASTIC 3-D MODELS

General solution for 3-D viscoelastic four – element models that can be used at both numerical analysis of stressedly – deformed condition of road coatings and experimental investigations are offered

Estimating the Effect of Aqueous Cationic Latex From the Class of Thermal Elastic Plastics on the Properties of Bitumen Emulsions

To produce cationic bitumen emulsions, bitumen is used, whose penetration is not lower than 90 mm-1. Such bitumen has a small plasticity interval, which leads to a deterioration in its heat resistance at elevated temperatures and narrows the scope of application of emulsions based on it. Based on the review of emulsion modification methods, the modification has been proposed that involves mixing the finished bitumen emulsions with aqueous cationic latex. The process of interaction between a bituminous emulsion and an aqueous cationic latex has been considered. A mechanism for the disintegration of the modified bitumen emulsion on the surface of mineral materials was proposed. The emulsifiers have been selected and the composition of the aqueous phase has been chosen based on the analysis of surface tension isotherms. The influence of the modification on the properties of bitumen emulsions was investigated. It was established that the main physicochemical characteristics of the interphase surface accept similar values for the aqueous phase and emulsions based on it. It has been proven that the introduction of aqueous cationic latex quite moderately affects the basic physical-mechanical properties of emulsions, which makes it possible not to change the main technological parameters when using them. It was established that increasing the concentration of the polymer in the emulsion has a positive effect on the physical-mechanical properties of the binder. With an increase in the concentration of the polymer to 6 % the softening temperature increases by 16 °C, elasticity is 74 %, and the holding capacity at minus 25 °C is approaching 100 %. Improving the physical-mechanical properties of residual binder as a result of emulsion modification could increase the durability of layers in a roadbed based on bitumen emulsions and expand the scope of their application in the construction and repair of motorway

An Investigation of the Effect of Thermoplastic Additives in Asphalt Concrete Mixtures on the Properties of Different Types of Asphalt Concrete

The effect of modification of asphalt concrete mixtures of different grain sizes with “Ric-Polycell” (Ukraine) and “Duroflex®-SMA” thermoplastic polymers (Germany), which were added directly to the asphalt mixer during their preparation, on the properties of asphalt concrete was studied. It is confirmed that it is more expedient to use stone mastic asphalt concretes with a larger size of mineral crushed stone grains on high-traffic roads, as they are more rutting-resistant compared to asphalt concretes with smaller size and content of crushed stone grains. The effect of the temperature of preparation and thermostating of asphalt concrete mixtures modified with the investigated thermoplastics on the compressive strength of asphalt concrete at a temperature of 50 °С, which were made of the studied mixtures, was investigated. It was found that the maximum possible temperatures of preparation and thermostating of asphalt concrete mixes provide a more complete modification. The effect of the content of thermoplastic polymers in the composition of asphalt concrete mixtures on the properties and rutting resistance of fine-grained asphalt concrete, as well as stone mastic asphalt concrete, was studied. It was found that adding the “Ric-Polycell” polymer in the amount of 1.5 % and 3 % by weight of bitumen in the composition of the studied asphalt mixtures in the asphalt mixer during their preparation increases the rutting resistance of asphalt concrete under the studied conditions by 2.52–3.86 times. Modification of asphalt concrete mixtures with the “Duroflex®-SMA” additive in the amount of 0.3 % and 0.6 % by weight of the aggregate by a similar technology also allows increasing the rutting resistance of the obtained asphalt concrete by 1.86–3.16 times. Using these modifiers in the future will have a positive effect on the service life of the entire pavement structur

An Investigation of the Effect of Thermoplastic Additives in Asphalt Concrete Mixtures on the Properties of Different Types of Asphalt Concrete

The effect of modification of asphalt concrete mixtures of different grain sizes with “Ric-Polycell” (Ukraine) and “Duroflex®-SMA” thermoplastic polymers (Germany), which were added directly to the asphalt mixer during their preparation, on the properties of asphalt concrete was studied. It is confirmed that it is more expedient to use stone mastic asphalt concretes with a larger size of mineral crushed stone grains on high-traffic roads, as they are more rutting-resistant compared to asphalt concretes with smaller size and content of crushed stone grains. The effect of the temperature of preparation and thermostating of asphalt concrete mixtures modified with the investigated thermoplastics on the compressive strength of asphalt concrete at a temperature of 50 °С, which were made of the studied mixtures, was investigated. It was found that the maximum possible temperatures of preparation and thermostating of asphalt concrete mixes provide a more complete modification. The effect of the content of thermoplastic polymers in the composition of asphalt concrete mixtures on the properties and rutting resistance of fine-grained asphalt concrete, as well as stone mastic asphalt concrete, was studied. It was found that adding the “Ric-Polycell” polymer in the amount of 1.5 % and 3 % by weight of bitumen in the composition of the studied asphalt mixtures in the asphalt mixer during their preparation increases the rutting resistance of asphalt concrete under the studied conditions by 2.52–3.86 times. Modification of asphalt concrete mixtures with the “Duroflex®-SMA” additive in the amount of 0.3 % and 0.6 % by weight of the aggregate by a similar technology also allows increasing the rutting resistance of the obtained asphalt concrete by 1.86–3.16 times. Using these modifiers in the future will have a positive effect on the service life of the entire pavement structur