Rubber powder modified concrete asphalt mortar

Abstract

The invention relates to rubber powder modified cement bitumen mortar which is formed by mixing the components with the weight ratio as follows: 100 parts of cement, 50 to 170 parts of emulsified asphalt, 5 to 80 parts of rubber powder, 160 to 230 parts of sand, 20 to 85 parts of water, 0.01 to 0.1 parts of aluminium powder, 0.1 to 0.5 parts of anti-foam additive and 0.05 to 0.2 parts of thickener. The invention adopts the rubber powder to partially substitute the emulsified asphalt to prepare CA mortar, thereby obviously improving the weathering resistance of the CA mortar and reducing the cost of the CA mortar; the CA mortar has better weathering resistance when the rubber powder has higher mix proportion. Within the dosage range of the invention, the rubber powder has no disadvantage to the performances of the CA mortar, such as workability, strength, modulus of elasticity, degree of separation, expansion rate, bleeding rate, frost resistance, etc.

Description

technical field [0001] The invention relates to a ballastless track mortar material suitable for high-speed railways and urban light rails, in particular to a rubber powder modified cement bitumen mortar, which belongs to the field of building materials. Background technique [0002] Cement asphalt mortar (abbreviated as CA mortar) is a key component of slab ballastless track. It plays a role of stability and buffer during train operation, and plays a very important role in improving the safety of train running at high speed and the comfort of riding. CA mortar has high strength and is not easily damaged. Therefore, CA mortar is used instead of ballast to pour between the track slab and the concrete base. On the one hand, it makes the track elastic. For adjustments made during maintenance. The ballastless track structure has the advantages of good stability, long-lasting track geometry, less maintenance work, good durability, small dead load in the second phase of the bridg...

AI Technical Summary

Problems solved by technology

Therefore, it is an improvement direction to use modified emulsified asphalt instead of ordinary emulsified asphalt to prepare CA mortar. However, because the emulsification of modified asphalt is difficult, the emulsification process is complicated, and the cost of emulsified asphalt will be greatly increased. Therefore, using modified emulsified asphalt It is difficult to achieve the purpose of modification and cost reduction at the same time when preparing CA mortar with asphalt

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