A kind of cement asphalt mortar and preparation method thereof

Abstract

The invention discloses cement asphalt mortar and a preparation method thereof. The cement asphalt mortar comprises emulsified asphalt, cement, fine sand, an expanding agent, aluminium powder, and water. The formula of the emulsified asphalt comprises asphalt, an anionic emulsifier, a cationic emulsifier, a stabilizing agent, a thickening agent, a water reducer, an antifoaming agent, alcohol, polymer latex and water. The cement asphalt mortar of the invention adopts specially prepared emulsified asphalt; when the emulsified asphalt is mixed with dry materials of cement, dry sand, and the like, the water reducer, the antifoaming agent, and the polymer latex are easy to disperse uniformly, and the contact with the dry materials is full; the water reduction effect is significant; the bleeding phenomenon of the CA mortar after pouring is effectively prevented; the workability of the emulsified asphalt with cement and fine sand is improved; with the synergistic effect of the alcohol, the freezing resistance of the CA mortar is improved; big bubbles are eliminated effectively; the CA mortar is compact and uniform in texture after molding, and has the characteristic of good weatherability. The cement asphalt mortar of the invention is especially suitable for being poured below a track plate during high speed railway building and used as a damping buffer layer.

Description

technical field [0001] The invention relates to a cement asphalt mortar and a preparation method thereof, in particular to a cement asphalt mortar poured under a slab-type ballastless track slab when building a high-speed railway and a preparation method thereof. Background technique [0002] With the improvement of the level of railway construction and the requirements for railway transport capacity, the demand for high-speed railway and urban light rail continues to increase. In order to improve the stability of train running at high speed and reduce the noise caused by vibration during train operation, it is generally necessary to use plate-type ballastless track technology. The slab ballastless track technology is to lay two tracks on a reinforced 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 mo...

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

Images