Thixotropic agent for ballastless track bed-plate concrete

Abstract

The invention belongs to the technical field of ballastless track construction and especially relates to a thixotropic agent for concrete of a bed-plate at the curve superelevation section of a ballastless track. In allusion to the problem that drainage slope and curve superelevation are not easy to control during pouring of concrete of a bed-plate at the curve superelevation section, a thixotropic agent for improving shape retaining ability of fresh concrete is invented. The thixotropic agent comprises the following ingredients (by weight): 0.5-4 parts of attapulgite, 0.5-5 parts of meerschaum, 0.02-0.38 part of fumed silica, 2-30 parts of silica fume, 0.06-0.5 part of triterpenoid saponin, 0.03-0.5 part of cellulose ether and 0-2.5 parts of fiber. By the use of the thixotropic agent, static morphological stability of fresh concrete can be greatly promoted, and slope fixing forming can be realized after pouring. Meanwhile, dynamic deformation energy is not increased, and concrete has good rheological performance during constructions of pumping, pouring, vibrating and the like and is convenient for construction. The product of the invention is of great significance for ensuring construction quality control of drainage slope and curve superelevation of the ballastless track bed-plate.

Description

technical field [0001] The invention belongs to the technical field of ballastless track construction, and in particular relates to a thixotropic agent for the concrete of the base plate of the ballastless track in the super-high section of the curve. Background technique [0002] Ballastless track is one of the main structural types used in my country's high-speed railway construction. The concrete base is an important structural part and main load-bearing member of the ballastless track. In order to discharge the accumulated water on the surface of the ballastless track in a timely and effective manner, the design requires that horizontal drainage slopes be set on both sides of the concrete surface of the base (currently generally require ≥ 4%). However, the existing engineering practice shows that the setting of the lateral drainage slope and elevation control of the base of the curved superelevation section has always been a difficult point in the concrete construction ...

AI Technical Summary

Problems solved by technology

[0011] The present invention aims at problems such as the inability of ordinary concrete to be effectively maintained and shaped before hardening, resulting in the unsatisfactory design of the base plate and the unsatisfactory realization of the drainage slope, as well as the labor-intensive, time-consuming and labor-intensive processing. Preparation of high thixotropic concrete with thixotropic agent for base plate concrete

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