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

ChemRN: Materials Characterization (Topic) Pub Date : 2021-08-31 DOI:10.15587/1729-4061.2021.237323

V. Zhdaniuk, V. Novakovska

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引用次数: 0

Abstract

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 motorways

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热弹性塑料类水性阳离子胶乳对沥青乳液性能影响的评价

生产阳离子沥青乳液，采用沥青，其渗透度不低于90 mm-1。这种沥青的塑性区间小，导致其在高温下的耐热性变差，从而缩小了以其为基础的乳液的适用范围。在对乳液改性方法进行综述的基础上，提出了将改性后的沥青乳液与水性阳离子乳胶混合的改性方法。研究了沥青乳液与水性阳离子乳胶相互作用的过程。提出了改性沥青乳液在矿物材料表面崩解的机理。根据表面张力等温线的分析，选择了乳化剂和水相的组成。研究了改性对沥青乳状液性能的影响。确定了相间表面的主要物理化学特性在水相和基于它的乳液中接受相似的值。实践证明，水性阳离子乳胶的引入对乳液的基本物理力学性能的影响是相当适度的，这使得在使用乳液时不改变主要的工艺参数成为可能。结果表明，增加乳液中聚合物的浓度对粘合剂的物理力学性能有积极的影响。当聚合物的浓度增加到6%时，软化温度增加16℃，弹性增加74%，在- 25℃时保持容量接近100%。通过乳液改性，改善残余粘结剂的物理力学性能，可以提高沥青乳液路基层的耐久性，扩大其在高速公路建设和维修中的应用范围

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ChemRN: Materials Characterization (Topic)

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