Concrete for unballasted track plate

Abstract

The invention discloses concrete for a ballastless rail slab, which is obtained by compounding the common Portland cement with an early strength admixture, an early strength polycarboxylate water reducing agent and sand, stone and water, wherein the water cement ratio is controlled to be between 0.25 and 0.35. Particularly, the concrete is prepared by mixing 430 to 500 kilograms per cubic meter of cement (A), the early strength admixture (B) which is 8 to 15 weight percent of the cement content, the early strength polycarboxylate water reducing agent (C) which is 1.0 to 1.5 weight percent of the total weight of A and B, the water (D) which is 25 to 35 weight percent of the cement content, and the sand and the stone, wherein the usage of the sand and the stone is the remain amount of deducting the weight of A, B, C and D from the total weight of the concrete per cubic meter, and the sand is 35 to 40 percent of the total weight of the sand and the stone. The concrete meets the requirements that the slump is between 140 and 200 millimeters and the compressive strength within 16 hours is more than 48 MPa, the relative durability index thereof is increased obviously compared with a reference sample, and the produced ballastless rail slab completely satisfies the technical requirement of 'Tentative Technical Condition of High Performance Concrete for Passenger Dedicated Lines'.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a water reducer 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. BOGL technolog...

AI Technical Summary

Problems solved by technology

[0004] (1) Ultra-fine cement does not belong to the conventional supply variety, and must be negotiated with the cement factory for special production, so its price is 3 to 4 times that of ordinary cement, which greatly increases the production cost of Borg board

[0005] (2) Since the specially processed ultra-fine cement is not a bulk product, when there is a large demand for Borg board production, there is a potential crisis of short supply;

[0006] (3) The cementitious materials of concrete are all ultra-fine cement, which will lead to limited growth of its later strength and durability problems

Moreover, the concrete durability index (electric flux) prepared by BOGL technology cannot meet the requirements of the "Interim Technical Conditions for High Performance Concrete for Passenger Dedicated Lines"

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