Emulsified asphalt

Abstract

The present invention provides emulsified asphalt made of asphalt, surfactant, additive and water; wherein, the contents of each component are: 38 percent to 58 percent of asphalt, 1 percent to 15 percent of ionic surfactant and 2.5 to 19 percent of non-ionic surfactant of the surfactant, 0.5 to 8 percent of additive; and the left is water; all are calculated according to a weight percentage. Theproduct of the present invention is the emulsified asphalt of good stability and simple production process. In the actual use, the CA mortar can avoid eduction and contraction; thus the CA mortar hasappropriate work time and high strength in the early period, which can fully meet the requirements of plate type ballastless track. Therefore, the product of the present invention can be effectively used in emulsified asphalt cement mortar (also known as CA mortar) for plate type ballastless track of high-speed railway or urban light rail.

Description

an emulsified asphalt technical field The invention relates to an emulsified asphalt, in particular to an emulsified asphalt mainly used in emulsified asphalt cement mortar (also known as CA mortar) for high-speed railway slab ballastless track or urban light rail. Background technique At present, my country is implementing a large-scale high-speed railway plan. It is reported that the Ministry of Railways announced that 20,000 kilometers of high-speed dedicated railways will be built in the next five years. In the construction of high-speed railways, the roadbed will use a large number of "ballastless track" technology. The new "ballastless track" is similar to a "cement road" and will no longer have a gravel roadbed. Compared with ordinary railways, ballastless tracks have the advantages of no splash damage, high stability, less maintenance and long service life. The ballastless track technology is the most mature in Europe and Japan. It is characterized by laying a co...

AI Technical Summary

Problems solved by technology

However, the existing emulsified asphalt does not consider the special requirements of CA mortar in the application of high-speed railway slab ballastless track, such as fluidity, working time, early strength, segregation shrinkage and weather resistance, so if it is used as one of the main components When used in CA mortar, the mortar produced is prone to problems such as short working time, insufficient strength, segregation shrinkage, etc.

Chinese patents 200410023087.0 and 200410023086.6 disclose a kind of emulsified asphalt and asphalt cement mortar, but there are still defects in stability, cost, etc.

Chinese patent 200610113251.6 discloses a special emulsified asphalt for railway or light rail slab-type ballastless track. It needs hydrochloric acid to adjust the pH value, which is easy to cause corrosion to storage and transportation equipment such as iron drums, storage tanks, and tank cars. At the same time, it also needs to add a thickener. And inorganic salt as stabilizer, the preparation process is complicated

In short, the emulsified asphalt used to prepare emulsified asphalt cement CA mortar mainly has poor stability, high ionic strength, and poor compatibility with cement systems, so that the prepared emulsified asphalt cement CA mortar has a short working time and a narrow temperature range. , easy shrinkage and delamination, poor filling performance, etc., especially in terms of stability and early strength, it did not meet the technical conditions of emulsified asphalt cement CA mortar for ballastless tracks stipulated by the Ministry of Railways

Although there are similar products in foreign countries, there are problems such as high prices, limited sources of raw materials, and complicated production processes.