Emulsified asphalt and preparation method thereof

Abstract

The invention discloses an emulsified asphalt and a preparation method thereof. A formula of the emulsified asphalt comprises asphalt, a cationic emulsifier, an anionic emulsifier, a thickener, a stabilizer, a water reducing agent and water. According to the invention, the water reducing agent is added to asphalt emulsion as a component for not only playing the role of the reducing agent itself, reducing operation steps during construction, but also for cooperating with the cationic surfactant and the anionic surfactant, thus obviously improving sieve residual amount, storage stability and especially indexes of cement miscibility of the emulsified asphalt. The emulsified asphalt provided by the invention is used for cement asphalt mortar pouring of a plate-type ballastless track during construction of a high-speed railway.

Description

technical field [0001] The invention relates to an emulsified asphalt and a preparation method thereof, in particular to a special emulsified asphalt for cement asphalt mortar and a preparation method thereof. The emulsified asphalt of the present invention is used for pouring cement asphalt mortar (abbreviated as CA mortar) into slab ballastless tracks when building high-speed railways. Background technique [0002] With the improvement of the level of railway construction and the requirements for railway transport capacity, it is necessary to build high-speed railways and intercity light rails. In order to improve the stability of trains running at high speed and reduce the noise caused by vibrations when trains are running, slab ballastless track technology is adopted. The slab ballastless track technology is to lay two tracks on a reinforced concrete slab (called track slab), and a 3-5cm thick shock-absorbing layer needs to be laid under the track slab. The shock-absorbi...

AI Technical Summary

Problems solved by technology

The process of preparing mortar is carried out in a mixer truck, which is an intermittent operation. Due to the small amount of defoamer and water reducer, it is difficult to control the measurement accurately, and even if it is stirred quickly, the distribution of the two in the mortar It is also difficult to be uniform. Once the measurement is wrong or the distribution is uneven, it will affect the properties of the mortar. The main performance is that the defoaming is not complete. When the mortar is poured, more air bubbles will be accumulated under the four corners of the track plate. Insufficient strength of the corners

In addition, in order to make the high-iron emulsified asphalt mixed with a large amount of cement and fine sand not to be demulsified during high-speed stirring, and to have a certain strength against mechanical damage, generally when producing high-iron emulsified asphalt, the amount of surfactant will be If the emulsified asphalt is very large, it is easy to produce a large amount of foam during the production and loading of high-speed rail emulsified asphalt, occupying a large space in the product tank. If the operation is not done properly, the emulsified asphalt foam will easily emerge from the tank mouth, which will cause inconvenience to production and transportation.

In addition, if the foam of the emulsified asphalt is too much, a thick skin will be formed after the foam disappears. This skin is formed by linking the asphalt components on the foam after the foam disappears, and it can no longer be emulsified even if it is stirred. , so it will affect the properties of emulsified asphalt, especially the index of remaining amount on the sieve, and even easily lead to the demulsification of emulsified asphalt

In addition, adding defoamer and water reducing agent at the construction site is cumbersome, which affects the construction progress and adds trouble to the structural design of the mixer truck