Hydrochloric and Orthophosphoric Acids Use in the Quick-Traffic Slurry Surfacing Mix

Abstract

This article is devoted to development and production (on a lab emulsion plant) of six compositions of slow-setting bitumen emulsions for a slurry-surfacing mix. An aggregate composition for Type 1 (0-5 mm) and Type 3 (0-15 mm) slurry-surfacing mixes was determined and selected. Results of the slurry surfacing mix composition selected by the criteria of a mixture decay, cohesion strength build-up rate and material loss by wet track abrasion testing-on the basis of bitumen emulsions produced from both distilled and oxidized bitumen, using various emulsifiers and both hydrochloric and orthophosphoric acids, are presented in the article. Advantages of using slurry-surfacing mixes based on emulsion produced with orthophosphoric acid and Redicote C-320Е emulsifier were proved. Such a system either minimizes or eliminates in its composition the use of the mixture decomposition regulator and reduces the content of Portland cement. The application of such a system makes it possible to produce slurry surfacing mix on the basis of low acid oxidized bitumen made from light petroleum and rock material through the criterion of the total surface activity determined by methylene blue with high rates of mix curing, and consequently the transport rapid start on the arranged thinlayer coating. Besides, the wet track abrasion indices of this system are substantially lower than in traditional system on oxidized bitumen, and even lower in comparison with the system on distilled bitumen.

Quick-traffic slurry surfacing mix with orthophosphoric acid

“…It leads to rapid setting of bitumen emulsion, andas a consequenceimpossibility to receive the homogeneous mix, which is the essence of Slurry surfacing technology. The review of a number of published works on the topic of bitumen emulsions and Slurry surfacing has shown the possibility of using ortho-phosphoric acid (Н3РО4) instead of hydrochloric one in this technology (James, 2005;James, 2006;Hogendoorn, 2016;Solodkyy et al, 2018;Sidun et al, 2020). In their turn, a lot of investigators encourage usage of this acid.…”

Effect of Simultaneous Application of Glass Fiber Reinforcement and Polymer-Modified Asphalt Emulsion on DBST’s Resistance to Aggregate Loss Using Laboratory Investigation

“…A study from 2015 compared different production methods of bitumen emulsion for slurry seals, namely oxidated, distillation, and modified oxidated bitumens [15]. Another study in 2020 added hydrochloric and orthophosphoric acids in bitumen emulsions to produce a slow-setting slurry surfacing mix [16]. Moreover, in 2022, a study proposed the addition of Phenol-cresol-formaldehyde resins, a material obtained from the phenolic fraction of coal tar, to asphalt as an enhancer of its adhesive properties [17].…”

Features of the Mix Time of Bitumen Emulsions With Cement for Slurry Surfacing Technology

“…Slurry Surfacing pavements construction is highly sensitive to changes in both Slurry Surfacing mix components and their dosage, as for instance: origin and type of bitumen (distilled from heavy crude oil or oxidized from light one), type and quantity of acid, emulsifier in emulsion and control agent for mix time, water in the mix etc. (Sidun, 2019;Sidun, 2020). Besides, present in Slurry Surfacing mix is Portland cement, performing the function of both finely dispersed filler and control agent for the mix time of the mix.…”