Low-elastic modulus and high-performance concrete

Abstract

The present invention relates to a concrete material, specifically to low-elastic modulus and high-performance concrete. In the prior art, because the concrete of the base plate of high speed railway II type slab ballastless track has high elastic modulus, the deformation of the base plate is difficult. With the present invention, the problem in the prior art is solved. The low-elastic modulus and high-performance concrete is prepared from the following raw materials, wherein the raw materials comprise, by weight, 220-240 parts of P.042.5 cement, 100-120 parts of class I fly ash, 30-40 parts of S95 slag powder, 850-900 parts of medium sand, 1000-1050 parts of 10-20 mm single-sized crushed stone, 148-152 parts of water and 3.3-3.5 parts of a polycarboxylate superplasticizer. With the present invention, the larger porosity of the crushed stone and the improvement of the concrete sand ratio are adopted to reduce the elastic modulus, a larger amount of the cementing material is adopted to make up for the reduction of the strength of the concrete, such that the index requirements of the high-performance concrete are met; the low-elastic modulus and high-performance concrete can be widely applicable for the special structures similar to high speed railway base plate and the like, wherein the special structures have high amortization requirements.

Description

technical field [0001] The invention relates to concrete materials, in particular to a low elastic modulus high performance concrete. Background technique [0002] The structure of type II slab ballastless track of high-speed railway is that the rail is laid on the fastener backing plate, and the fastener backing plate is placed on the rail bearing groove of the type II plate. The main function of the fastener backing plate is to adjust the elevation of the rail. Type II slab is a concrete structure with a length of 6.45m, a width of 2.55m, and a thickness of 0.2m, and the concrete strength is C55. A vertical overall structure. Below the Type II slab is the emulsified asphalt mortar filling layer (abbreviated as CA mortar). The emulsified asphalt mortar filling layer is a filling structure with a 28-day compressive strength ≥ 15.0 MPa, a thickness of 30mm, and an elastic modulus of 7000-10000 MPa, which has an obvious buffering effect The base plate is under the emulsified...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a low-elastic-modulus high-performance concrete in order to solve the problem that the elastic modulus of the base plate concrete of the existing high-speed railway type II ballastless track is too high to cause deformation

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