INVESTIGATION OF THE WETTING EFFECT OF SURFACTANTS OF VARIOUS NATURE IN THE BITUMEN COMPOSITION

YU.S. Byzova, A. Dyuryagina, K. A. Ostrovnoi, T. A. Gorshkova, P.O. Savelyeva
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Abstract

Asphalt concrete coverings are short-lived and are destroyed under the influence of external factors. The insufficient degree of adhesion at the interface between the bituminous binder and the hard surface of the mineral material causes a low hydrophobicity of asphalt concrete coatings, which is the main cause of damage and premature wear of the roadway. Optimization of the bitumen composition by introducing a variety of modifying agents can intensify the processes of wetting the hard surface with bitumen and increase the hydrophobicity of the surface films formed by it. The purpose is to establish the influence of various modifiers on the processes of wetting the surface of crushed stone with a bituminous composition, as well as to study the regularities of the influence of modifiers on the hydrophobicity of bituminous films. The methodology of this work included experimental determination of the wetting contact angle θ of a solid surface by the lying drop method at T=298 K. Results. Increasing the AC-2K content in bitumen from 0 to 1% reduced the contact wetting angle by 11.31° (relative to the base version without the modifier) to 114.35°. The AC-2 modifier contributes less to improving the wettability of the surface of the basic crushed stone with bitumen; with Cm=1%, the contact wetting angle is reduced to 118.68°. When modifying bitumen, PPS recorded a significantly smaller decrease in wetting contact angle at a higher concentration (Cm=2%) – by 2.4° (from 125.66° to 123.26°). The amino derivative AC-2K (Cm=1%) has the greatest water-repellent effect among the studied modifiers, increasing the wetting edge angle to 99.07°. Conclusion. The water-repellent properties of bituminous compositions are enhanced (Δθ=4.02°) at a narrow range of concentrations of the modifier AC-2K (with Сm=1%). The ultrasonic cavitation-derived AC-2K can be recommended for use in asphalt concrete coatings as an adhesive additive that provides a good wetting effect of bitumen in relation to the surface of the mineral filler while also increasing the hydrophobicity of bitumen films.
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不同性质表面活性剂在沥青组分中的润湿作用研究
沥青混凝土覆盖层寿命短,易受外界因素影响而破坏。沥青粘结剂与矿物材料坚硬表面界面处粘结程度不足,导致沥青混凝土涂层疏水性低,是造成巷道破坏和过早磨损的主要原因。通过引入多种改性剂对沥青成分进行优化,可以强化沥青润湿坚硬表面的过程,提高其形成的表面膜的疏水性。目的是建立各种改性剂对含沥青成分碎石表面润湿过程的影响,并研究改性剂对沥青膜疏水性影响的规律。本工作的方法包括在T=298 K时用卧滴法实验测定固体表面的润湿接触角θ。结果。当沥青中AC-2K的含量从0增加到1%时,接触润湿角(相对于未添加改性剂的基础版)降低了11.31°,达到114.35°。AC-2改性剂对改善碱性碎石与沥青表面润湿性的作用较小;Cm=1%时,接触润湿角减小为118.68°。当改性沥青时,在较高浓度(Cm=2%)下,PPS的润湿接触角下降幅度较小,仅为2.4°(从125.66°降至123.26°)。氨基衍生物AC-2K (Cm=1%)的拒水效果最好,可使润湿边角达到99.07°。结论。在改性剂AC-2K (Сm=1%)的较窄浓度范围内,沥青组分的拒水性得到增强(Δθ=4.02°)。超声空化衍生的AC-2K可以推荐用于沥青混凝土涂层中,作为粘合剂添加剂,它提供了沥青相对于矿物填料表面的良好润湿效果,同时也增加了沥青膜的疏水性。
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