Special performance regulator for secondary lining concrete and preparation method thereof

Abstract

The invention provides a special performance regulator for secondary lining concrete and a preparation method thereof. The special performance regulator comprises the following raw materials in percentage by weight: 50-60% of an expansion component, 30-40% of a modified mineral component, 0.1-4% of a suspension stabilizing component, 1-2% of a foam control component and 8-12% of a leveling component, wherein the total content of the raw materials is 100%. Compared with the prior art, the invention provides a special performance regulator for secondary lining concrete. The requirements on the flowability and the filling property of the secondary lining concrete are improved; the cohesiveness and the water-retaining property are improved; the invention not only can effectively compensate fordrying shrinkage and reduce stress cracking, but also can significantly improve the compactness and frost resistance of the concrete, ensures the mechanical properties and durability of the secondarylining concrete so that the properties of the secondary lining concrete meet the construction requirements of the secondary lining concrete, and is beneficial to the preparation of the secondary lining concrete meeting the requirements of the self-compacting concrete.

Description

technical field [0001] The invention belongs to the field of auxiliary agents for building materials, and in particular relates to a special performance modifier for second-lined concrete and a preparation method thereof. Background technique [0002] The concrete lining structure of the tunnel is not only a load-bearing structure bearing the pressure of the surrounding rock, but also an important barrier for the waterproofing of the tunnel structure. The design of the secondary lining concrete must meet the requirements of mechanical properties and compactness. Vibrate to ensure structural integrity. Since the secondary lining is of a thin-walled structure, the reinforcement is denser when the surrounding rock is poor, and the construction space is limited, local over-vibration or leakage is easy to occur during construction. In order to achieve high fluidity of the concrete, workers often add water twice during construction on site, so The surface of the secondary lining ...

AI Technical Summary

Problems solved by technology

[0005] The Chinese patent with publication number CN 108863148 A published on November 23, 2018 discloses a self-compacting concrete viscosity modifier. The modifier described in the patent can increase the viscosity of concrete without affecting the fluidity of concrete. The cohesion of the slurry can prevent segregation and bleeding of self-compacting concrete, but the modifier described in this patent cannot solve the shrinkage of self-compacting concrete during hardening, and cannot inhibit shrinkage and cracking

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