Modified emulsified asphalt and preparation method thereof

Abstract

The invention discloses modified emulsified asphalt and a preparation method thereof. The modified emulsified asphalt comprises the following components by weight: 55%-65% of asphalt, 0.3%-1.5% of cationic emulsifiers, 0.3%-1.5% of anionic emulsifiers, 0.05%-0.15% of stabilizing agents, 0.01%-0.05% of thickening agents, 0.1%-0.5% of water reducers, 0.8%-3.5% of alcohol, 1%-4% of polymer latex, and 30%-35% of water. The modified emulsified asphalt of the invention is good in miscibility with cement, good in storage stability, and low in oversize residual amount, and also has the advantages of freezing resistance, no bleeding, good flexibility, and good caking property. The modified emulsified asphalt of the invention is especially applicable to cement injection asphalt mortar for preparing plate-type ballastless tracks in high speed railway building.

Description

Technical field [0001] The invention relates to a modified emulsified asphalt and a preparation method thereof, in particular to a modified emulsified asphalt for cement asphalt mortar and a preparation method thereof. Background technique [0002] With the improvement of the level of railway construction and the improvement of railway transportation capacity, the demand for high-speed railways and urban light rails is increasing. In order to improve the stability of trains during high-speed operation and reduce the noise generated by train operations, plate-type ballastless is generally required Orbital technology. The slab ballastless track technology is to lay two tracks on a reinforced cement concrete slab (called track slab), and lay a 3-5cm thick shock-absorbing layer under the track slab. The shock-absorbing layer is made of emulsified asphalt, cement, fine Sand and other mineral materials form cement asphalt mortar (Cement Asphalt mortar, CA mortar for short). This tech...

AI Technical Summary

Problems solved by technology

In order to improve the flexibility and weather resistance of cement asphalt mortar, CN101508848A utilizes modified asphalt, cationic surfactant, nonionic surfactant, stabilizer to prepare modified emulsified asphalt, although the weather resistance and flexibility of CA mortar can be improved, However, the emulsification of modified asphalt is difficult, and the requirements for equipment are harsh. The emulsifier dosage required is large. The total amount of surfactants reaches 7.1%. The amount of water reducer and defoamer added when preparing mortar is also large. The two together account for 3.3% of the total amount of mortar, and the cost is greatly increased. The compatibilizers such as aromatic oil, third-line oil, fourth-line oil, and paraffin oil will affect the curing time of the mortar, thereby affecting the construction progress. In addition, the patent is in Surfactants are also added when mixing the mortar, the purpose is to make the modified emulsified asphalt meet the requirements of the mixing time, which not only adds another process to the site construction, the operation is troublesome, but also further increases the cost