In this article the cationic bitumen emulsions are characterized – as popular binder for various road emulsions. There are considered the specific features of cationic bitumen road emulsions’ formulations. There are presented the functions and specificities of the acids application in cationic bitumen road emulsions. The literary review is presented on potentialities of ortho-phosphoric acids application instead of the traditional hydrochloric acid. Chemical peculiarities of application are presented (as well as advantages and drawbacks of application) – for both the traditional hydrochloric acid and forward-looking ortho-phosphoric acid. As the advantages of ortho-phosphoric acid application for cationic bitumen road emulsions one can mention: simple replacement of acid in soap solution preparation, less corrosive acid, higher pH emulsions, acid is easier to store, fewer fumes, not regulated in some countries, unlike hydrochloric acid.

The potentialities are considered for application of ortho-phosphoric acid, as an effective component of cationic bitumen emulsion for application in various bitumen emulsion technologies, including the technologies for making protective slurry road pavements, among which the most wide-spread application was found by ortho-phosphoric acid in special fast-setting Slurry Surfacing systems, which possess a number of advantages over the same systems based on hydrochloric acid. The main of those advantages are as follows: such application eliminates the need for acid dopes in bitumen, provides a quick-traffic slurry system that works in cooler temperatures and at night, no need to change the usual latex or SBS grades, can use normal break retarders, mix controllable with cement in the field.

Sidun, I., Solodkyy, S., & Vollis, O. (2019). ACIDS IN BITUMEN EMULSIONS. JCEEA, t. XXXV, z. 65 (3/18). 83-90. doi:10.7862/rb.2018.45
Les emulsions de bitume, (2007).  Paris: SFERB-RGRA-USIRF. (Routes de France) (in French).
Delmar R. Salomon (2006). Asphalt emulsion technology, Transportation Research Circular E-C102, assembled by Delmar R. Salomon for the Transportation Research Board Characteristics of Bituminous Materials Committee,  Washington, August 2006.
AkzoNobel Surface Chemistry (2012). Information Bulletin of Department «Additives for road construction». Europe, Middle East, India and Africa. Asphalt concrete issues. Acids in cationic emulsions. Edition 83, 13.
AkzoNobel Surface Chemistry (2013). Asphalt concrete issues. Information Bulletin of Department «Additives for road construction». Redipave System for rapid-setting Slurry-Seal pavement on arbitrary bitumen. Europe, Middle East, India and Africa. Edition 84, 6.
James, A., & T, Ng. (2005). Phosphoric Acid In Microsurfacing Emulsions. To be presented at 13th Congreso Ibero-Latinoamericano del Asfalto (CILA), Costa Rica.
James, A., & T, Ng. (2006). Phosphoric Acid for Microsurfacing Emulsions, Alan James and Tony Ng, European Roads Review No. 9, Revue generale des Routes et des Aerodromes, 4-9.
Pyshyev, S., Grytsenko, Y., Solodkyy, S., Sidun, I., & Vollis, O. (2015). Using bitumen emulsions based on oxidized, distillation and modified oxidized bitumens for slurry seal production. Chem Chem Technol 9(3), 359-366. doi.org/10.23939/chcht09.03.359.
Sidun I., Vollis O., Solodkyy S., & Gunka V. (2020) Cohesion of Slurry Surfacing Mix with Slow Setting Bitumen Emulsions. In: Blikharskyy Z., Koszelnik P., Mesaros P. (eds) Proceedings of CEE 2019. CEE 2019. Lecture Notes in Civil Engineering, vol 47. Springer, Cham. doi: 10.1007/978-3-030-27011-7_53.
Hogendoorn, S. (2016). Phosphoric acid based micro surfacing systems. International Symposium on Asphalt Emulsion Technology. Nov.01 - 04,  Arlington Virginia
Krutko, N., (2008). Investigation of structural-rheological properties of bitumen films / NP Krutko, ON Opanasenko, OV Luksha // Nanosystems, nanomaterials, nanotechnologies. 6(2), 551-555.
Jordan, E., Ligier, S., Luca, V. (2016). Patent No. FR3056221A1. France. European Unitary Patent.
Antonov, Y. (1968). USSR Patent No. SU210992A1. USSR. Russian Patent and Trademark Office. (in Russian)