Composite high-early strength blending material for unballasted track plate and use thereof

Abstract

The invention discloses a composite early strength admixture for an unballasted track plate and application of the admixture and relates to the field of building material. The admixture consists of 50 to 70 weight percent of a silicon reinforcing material (A), 0 to 20 weight percent of a carbonate reinforcing material (B), 0 to 20 weight percent of an aluminium-silicon reinforcing material (C), 0to 20 weight percent of a silicon filling material (D), 0 to 20 weight percent of an aluminum filling material (E) and an excitant (F) in combined preparation, wherein B, C, D and E are not zero simultaneously; and the use amount of the excitant (F) is 0 to 5 weight percent of gross weight of (A+B+C+D+E). The admixture is applied to the manufacture of the unballasted track plate, can offset the insufficiency of concrete performance brought by the replacement of ultrafine cement by common silicate or silicate cement; collapse degree of the applied concrete is between 140 and 200 mm; 16h compressive strength is more than 48 MPa; and the high-performance concrete for the unballasted track plate fully meets the technical requirement of a provisional technical condition for high performance concrete in a passenger transportation dedicated line.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an admixture for ballastless track slabs. Background technique [0002] Ballastless track is a track structure composed of concrete or asphalt mixture instead of granular ballast bed. It has the characteristics of high track smoothness, good rigidity uniformity, long-term maintenance of track geometric shape and potential energy, and significantly reduced maintenance workload. , the train runs faster and more smoothly on it, which is the development direction of high-speed railway engineering technology and is also the most advanced track technology in the world today. [0003] Concrete mixture is generally obtained by mixing cement, sand, gravel and water in proportion. The ballastless track technology of the German BOGL company used in the construction of the Beijing-Tianjin Passenger Dedicated Line belongs to the slab ballastless track technology. ~600m 2 / kg ult...

AI Technical Summary

Problems solved by technology

The ballastless track technology of the German BOGL company used in the construction of the Beijing-Tianjin Passenger Dedicated Line belongs to the slab ballastless track technology. ~600m 2 / kg ultra-fine P.I52.5 cement to prepare concrete, and use ultra-fine cement to prepare Borg board in China, the following problems will be encountered: (1) Ultra-fine cement greatly increases the production cost of Bourg board

(2) Ultra-fine cement is not a bulk product. When there is a large demand for ballastless track slab production, there is a potential crisis of short supply; (3) All the cementitious materials of concrete are ultra-fine cement, which will lead to limited growth in its later strength , there is a problem with durability

The commonly used admixtures are fly ash, slag or silica fume. These admixtures often have adverse effects on the performance of concrete when mixed alone, especially cannot meet the technical requirements of ballastless track slabs.

Images