Efficient thixotropic agent for tunnel lining concrete and preparation method of efficient thixotropic agent

Abstract

The invention provides an efficient thixotropic agent for tunnel lining concrete and a preparation method of the efficient thixotropic agent. The efficient thixotropic agent is prepared from the following raw materials in parts by mass: 10-20 parts of a long-acting dispersing agent, 20-60 parts of water, 0.5-2.5 parts of a thickening agent, 0.4-1 part of sulfate, 0.4-1 part of carbonate, 0.6-1.2 parts of a defoaming agent and 4-8 parts of nano powder. The efficient thixotropic agent is excellent in thixotropic effect and high in thixotropic effect retention capacity, stirred concrete is good in flowing property, the setting time of the concrete is not affected, the segregation problem caused by large-altitude-difference free falling, long-term vibration and the like can be effectively solved, and the pouring efficiency and the construction quality of tunnel lining concrete are guaranteed.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a high-efficiency thixotropic agent for tunnel lining concrete and a preparation method thereof. Background technique [0002] Tunnel lining is poured by lining trolley. Concrete pouring has undergone multiple turnovers such as pumping, chute, and free flow, and the flow distance in the airtight and narrow membrane cavity is long, resulting in a large loss of concrete fluidity. In order to ensure the pouring effect, the water-binder ratio of the lining concrete and the amount of superplasticizer are relatively high. During the pouring process, various vibration methods are often used to vibrate the concrete for a long time to increase the flow capacity of the concrete. However, the concrete with high fluidity is prone to segregation, bleeding and aggregate separation during the long-term vibration process. At the same time, when the tunnel lining concrete is poured, ...

AI Technical Summary

Problems solved by technology

[0006] (1) The amount of thixotropic agent added is large, the degree of matching with the water reducing agent is not high, and the performance of concrete fluctuates greatly;

[0007] (2) The thixotropic effect is general, and the thixotropic effect on high-fluidity concrete is limited, especially under external disturbances such as vibration, the thixotropic ability drops seriously;

[0008] (3) The retention of the thixotropic agent is low, and the thixotropic effect of concrete is seriously lost over time;

[0009] (4) The thixotropic agent contains a large number of hydroxyl groups, or in order to improve the retentive hydrolysis to generate small molecular polyols, which will retard the concrete and seriously affect the early strength of concrete

[0010] Therefore, in view of the above problems, a high-efficiency thixotropic agent for tunnel lining concrete has been invented. It has excellent thixotropic effect, strong thixotropic effect retention ability, no influence on the setting time of concrete, and can effectively improve the stability of concrete in confined and long spaces. It can solve the segregation problem caused by large height difference free fall and long-term vibration, etc., and ensure the pouring efficiency and construction quality of tunnel lining concrete

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