Asphalt cement mortar

Abstract

The invention discloses an asphalt cement mortar, which is a compound synthesized by dry materials, emulsified asphalt, water-reducing agent, defoaming agent and water pro rata. Each component in the mixture is calculated in portions by weight: 70-80 portions of the dry materials, 10-20 portions of the emulsified asphalt, 0.1-0.4 portion of the water-reducing agent, 0.005-0.01 portion of the defoaming agent and 8-15 portions of the water. The dry materials consist of cement, aggregate and expansion agent. Each component in the dry materials is calculated in portions by weight: 35-42 portions of the cement, 58-65 portions of the aggregate and 0.0015-0.0025 portion of the expansion agent. The component proportion of the asphalt cement mortar of the invention is proved by a great number of experiments and can lead each component to be fully used and generate synergistic effect. The invention has appropriate intensity and elasticity, good weather resistance and construction ability and can completely meet the need of plate-typed unballasted track construction in railways or in cities. Furthermore, the raw materials of the components of the invention are all produced in domestic, thus greatly saving cost.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an asphalt cement mortar. Background technique [0002] For a high-speed railway with a design speed of 350 kilometers per hour, driving comfort and safety are of utmost importance. Neither the bearing capacity nor smoothness of traditional ballasted tracks can guarantee the safe running of high-speed trains. The slab ballastless track technology uses formed composite materials instead of ballast, which distributes the wheel-rail force evenly and transmits it to the subgrade foundation. The slab ballastless track technology uses Borg slabs to carry the rails, and the subgrade concrete is a reinforced concrete structure, both of which are strong but inelastic structures. In order to ensure the comfort and safety of driving, a kind of cushion mortar is needed as a buffer filling material. This kind of mortar should not only have a certain degree of elasticity, but also...

AI Technical Summary

Problems solved by technology

The research and development of slab ballastless track in foreign countries is earlier, and asphalt cement mortar, which is the key technology of slab ballastless track structure, has also been widely used, and the use effect is good, but there are disadvantages such as high price and limited source of raw materials

Although the research on asphalt cement mortar was carried out earlier in China, there are also some literature reports, but the test pavement of slab ballastless track on the two super bridges of the Qinshen Passenger Dedicated Line Gouhe and Shuanghe Bridge shows that the existing domestic The actual application effect of some asphalt cement mortar is still unsatisfactory. This is mainly because the components of asphalt cement mortar and their proportions have an impact on the performance of the mortar, and the dry material has a significant impact on the material separation and the amount of added water of the asphalt cement mortar. , the water demand of dry material directly affects the amount of water added when mixing asphalt cement mortar. If the water demand of dry material is too high, it is impossible to add water to make the fluidity of asphalt cement mortar meet the standard; the amount of water added has an effect on the fluidity of asphalt cement mortar The impact is great. As the amount of added water increases, the flow time of asphalt cement mortar becomes smaller. When the amount of added water is too small (≤165kg / m 3 ), the flow time of the asphalt cement mortar is too long (≥130s), and the asphalt cement mortar cannot be poured (≥200kg / m 3 ), the flow time of the asphalt cement mortar is too short (≤70s), and the asphalt cement mortar will precipitate; and under the existing ratio, the emulsified asphalt and cement are not easily compatible, which also greatly affects the asphalt cement mortar performance

The above factors lead to the existing asphalt cement mortar has the disadvantages of poor fluidity, short working time, narrow temperature adaptability range, and easy separation of mortar.