Adhesive agents for road bitumen and polymer-bitumen binders (PBB)

One of the most important reasons for the premature destruction of pavements and poor condition of roads is the lack of firm adhesion of bitumen to the surface of mineral materials, especially acidic rocks, and as a consequence, insufficient water and frost resistance of the pavement, leading to erosion, peeling, chipping, cracking, potholes.

The adhesion of bitumen to mineral materials depends both on the adhesion properties of the bitumen and on the mineralogical composition of the mineral materials. Oil bitumen used in road construction are characterized by diverse composition and complex physical and chemical structure, which depend both on the nature of oil raw materials and on the technology of its processing. Most of the oil bitumen produced in Russia in accordance with GOST 22245-90 do not meet the necessary requirements for the index of adhesion to mineral materials due to exposure to oxidation processes during production.

Mineral materials used in road construction are characterized by different surface structures and, due to the variety of mineralogical composition, certain acid-base properties. The characteristics of the mineral material determine the nature and strength of the binder's interaction with its surface.

During its activities ZAO "AMDOR" has carried out development and organized industrial production of several brands of adhesion agents. In recent years, the most widely used adhesion agents "AMDOR-9" and "AMDOR-10For most used bitumen and mineral materials, including acidic rocks, for example granites, the effective concentration of agents in the bitumen is in the range of 0.2-0.5%. At the same time, adhesion is provided at the level of control sample No. 1 when tested in accordance with GOST 11508-74. Adhesion agents "AMDOR-9" and "AMDOR-10" are characterized by technological effectiveness, retain adhesion properties when injected into bitumen at temperatures up to 160 º C for 72 hours.

Adhesion agent "AMDOR-10", which is an improved analogue of the agent "AMDOR-9", is characterized by improved organoleptic properties, lower viscosity and lower pour point (up to-3 ºC), which allows its use at low temperatures.

When applying adhesion agents "AMDOR-9" and "AMDOR-10" in the amount of 1.5-5kg of bitumen (0.15/0.50%): a high degree of adhesion of bitumen with mineral materials is achieved.

1. The use of adhesion agents reduces the water saturation of bitumen-concrete mixture and increases the coefficient of water resistance for long-term saturation, which is the determining parameter of the technological properties of bitumen-concrete mixture.
2. Compressive strength after prolonged saturation increases.
3. Tensile strength at a split at 0 ºC after 20 cycles of freezing and thawing increases significantly, which characterizes the frost resistance of bitumen-concrete mixture.

Thus, the use of adhesion agents "AMDOR-9" and "AMDOR-10" increases the moisture and frost resistance of road pavements, which leads to an increase in their wear resistance and durability.

When applying adhesion agents "AMDOR-9" and "AMDOR-10" in the amount of 1.5-5 kg/t of bitumen (0.15 ÷ 0.50 %):

• high degree of adhesion of bitumen with mineral materials is achieved
• bitumen-concrete mixture plastic properties are improved, which contributes to improved enveloping, workability and mobility of the bitumen-concrete mixture, their better compaction during rolling, reducing caking of cold asphalt concrete
• it is possible to reduce the consumption of bitumen by 5-10 %
• it is possible to reduce the temperature of bitumen by 10-20 ° C in preparation of hot bitumen concrete mixtures
• energy consumption for technological needs is reduced
• productivity of asphalt concrete mixing plant equipment and sealing road machines increases
• the season of road construction works is increasing
• the service life of the road pavement is increased by 1.5-2 times

• significantly higher thermal stability – up to 15 days
• no unpleasant smell
• retention of fluidity to minus 8 ºС
• slowing the aging of bitumen.

The recommended dosage of the agent is 0.1÷0.4 % of the binder weight.

An important feature of the thermostable agent "AMDOR-20T" is the increase in the adhesive efficiency of bitumen with the additive at temperatures of 150-160 ºC during the first 2 – 3 days and its preservation up to 15 days, which makes it possible to prepare and store bitumen with the additive for a long time. Due to this feature of the additive, it can be injected when mixing in bitumen and polymer-bitumen industries, thereby reducing this operation in the asphalt concrete mixing plant.

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