Thixotropic agent for ballastless track base plate concrete

A ballastless track and thixotropic agent technology, applied in the field of ballastless track construction, can solve the problems that ordinary concrete cannot effectively maintain the shape, the drainage slope cannot be smoothly realized, and the base plate does not meet the requirements, etc., achieving significant technical and economic efficiency and improving Construction quality, effect of improving construction and performance

Active Publication Date: 2018-11-06
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Thixotropic agent for ballastless track base plate concrete
  • Thixotropic agent for ballastless track base plate concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 of the present invention provides a thixotropic agent for concrete of ballastless track base plate. After adding it to concrete, the static and dynamic yield stress of freshly mixed concrete, slope retention ability, and the mechanical and durability properties of concrete after hardening were tested. , and compared with the existing ordinary concrete test results, the details are as follows:

[0031] The mix ratio of high thixotropic concrete and ordinary concrete is shown in Table 2. Among them, the dosage of thixotropic agent for unilateral high thixotropic concrete is 12.2kg / m 3 , its composition is attapulgite 2.28kg / m 3 , sepiolite 0.8kg / m 3 , silica fume 7.6kg / m 3 , Fumed silica 0.2kg / m 3 , triterpene saponins 0.07kg / m 3 , cellulose ether 0.05kg / m 3 , lignin fiber 1.2kg / m 3 .

[0032] Table 2 Mixing ratio of high thixotropic concrete and ordinary concrete

[0033] serial number

cement

fly ash

Thixotropic agent

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Embodiment 2

[0041] Embodiment 2 of the present invention provides a thixotropic agent for ballastless track base plate concrete, using ordinary concrete and highly thixotropic concrete to pour the ballastless track base plate in a test section of a passenger train respectively, so as to evaluate ordinary concrete , High thixotropic concrete is used for the slope maintaining ability in the on-site concrete construction of the super-high section of the curve. The specific content is as follows:

[0042] In a passenger train, 100m long ballastless track base plates were pumped and poured according to the designed superelevation (of which, ordinary concrete was used for the uplink, and high thixotropic concrete was used for the downlink on the corresponding side to keep the test slope consistent. ), its mixing ratio is shown in Table 3, wherein, the dosage of unilateral high thixotropic concrete thixotropic agent is 10.63kg / m 3 , its composition is attapulgite 2kg / m 3 , sepiolite 0.8kg / m 3...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B28/00
CPCC04B28/00C04B40/0039C04B2103/0085C04B14/102C04B14/042C04B18/146C04B14/066C04B24/10C04B24/383C04B16/02C04B16/0633C04B14/42C04B14/4656C04B18/08C04B14/068C04B14/02C04B2103/302
Inventor 郑新国刘竞谢永江曾志李书明翁智财朱长华刘相会杨德军王月华杨鲁张雯
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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