Duct piece concrete anti-cracking reinforcing additive and preparation method thereof

A concrete and additive technology, applied in the field of segment concrete crack-prevention enhancement additive and its preparation, can solve the problems of insufficient compactness and compactness of segment combination, easy cracking of segment, affecting segment quality, etc., and achieves excellent water reduction rate, Not easy to crack or break phenomenon, good dispersion effect

Inactive Publication Date: 2020-10-30
CHINA RAILWAY NO 3 GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the concrete produced by the existing technology can only be used in the construction of large buildings. When the shield segments are poured and used, the internal joints of the segments are not compact enough, which leads to cracks easily appearing inside the segments, or the segments are prone to cracks due to the strength of the segments. Insufficient cracking will easily occur in the later stage, which seriously affects the quality of the segment, so we propose a segmental concrete anti-crack reinforcement additive and its preparation method to solve the above problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment proposes a segmental concrete anti-cracking reinforcement additive, including the following raw materials in parts by weight:

[0027] 32 parts of sodium bentonite, 42 parts of microcrystalline cellulose, 3 parts of naphthenic acid soap, 1 part of sodium carboxymethyl cellulose, 5 parts of JK-H2O(A) compound amino alcohol, 3 parts of gluconate, alkyl aromatic hydrocarbon 4 parts of sulfonic acid, 2 parts of water reducing agent, 1 part of early strength agent, 2 parts of inorganic aluminum salt water repellent, 2 parts of accelerator.

[0028] In this example, the water reducer is a mixture of alkyl naphthalene sulfonate, lignin sulfonate or any ratio thereof, the particle size of sodium bentonite is 1800-2400 mesh, and the particle size of microcrystalline cellulose is The particle size is 800-1200 mesh, and the solid content of trace impurities and sediment of the inorganic aluminum salt water repellent is higher than 24%.

[0029] In this example, th...

Embodiment 2

[0036] This embodiment proposes a segmental concrete anti-cracking reinforcement additive, including the following raw materials in parts by weight:

[0037] 34 parts of sodium bentonite, 43 parts of microcrystalline cellulose, 4 parts of naphthenic acid soap, 1.3 parts of sodium carboxymethyl cellulose, 5.4 parts of JK-H2O(A) compound amino alcohol, 4 parts of gluconate, alkyl aromatic hydrocarbon 4.4 parts of sulfonic acid, 3 parts of water reducer, 2 parts of early strength agent, 3 parts of inorganic aluminum salt water repellent, 3 parts of accelerator.

[0038] In this example, the water reducer is a mixture of alkyl naphthalene sulfonate, lignin sulfonate or any ratio thereof, the particle size of sodium bentonite is 2000 mesh, and the particle size of microcrystalline cellulose is 1000 mesh, the solid content of trace impurities and sediment of inorganic aluminum salt water repellent is higher than 24%.

[0039] In this example, the early strength agent is a mixture o...

Embodiment 3

[0046] This embodiment proposes a segmental concrete anti-cracking reinforcement additive, including the following raw materials in parts by weight:

[0047] 35 parts of sodium bentonite, 44 parts of microcrystalline cellulose, 4.5 parts of naphthenic acid soap, 1.5 parts of sodium carboxymethyl cellulose, 6 parts of JK-H2O(A) compound amino alcohol, 5 parts of gluconate, alkyl aromatic hydrocarbon 5 parts of sulfonic acid, 3.5 parts of water reducing agent, 2.5 parts of early strength agent, 4 parts of inorganic aluminum salt waterproofing agent, 3.5 parts of accelerator.

[0048] In this example, the water reducer is a mixture of alkyl naphthalene sulfonate, lignin sulfonate or any ratio thereof, the particle size of sodium bentonite is 2200 mesh, and the particle size of microcrystalline cellulose is 1200 mesh, the solid content of trace impurities and sediment of inorganic aluminum salt water repellent is higher than 24%.

[0049] In this example, the early strength agent...

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Abstract

The invention discloses a duct piece concrete anti-cracking reinforcing additive and a preparation method thereof. The additive comprises the following raw materials in parts by weight: 32-38 parts ofsodium bentonite, 42-46 parts of microcrystalline cellulose, 3-6 parts of naphthenic acid soap, 1-2 parts of sodium carboxymethyl cellulose, 5-7 parts of JK-H2O (A) composite amino alcohol, 3-7 partsof gluconate, 4-6 parts of alkyl aromatic sulfonic acid, 2-5 parts of a water reducing agent, 1-4 parts of an early strength agent, 2-6 parts of an inorganic aluminum salt waterproof agent and 2-5 parts of a setting accelerator. The preparation method comprises the following steps: step S1, sequentially weighing the raw materials; and step S2, putting the raw materials except the aluminum oxide into a grinding kettle for stirring and grinding to obtain an additive A and an additive B. A duct piece prepared by adding the additive prepared by the method into concrete has the advantages of favorable water resistance, favorable seepage resistance, favorable rust resistance, compact and compact structure and balanced duct piece internal stress distribution, and is not easy to crack or fracture.

Description

technical field [0001] The invention relates to the technical field of shield tunneling segment production, in particular to an anti-cracking reinforcing additive for segment concrete and a preparation method thereof. Background technique [0002] The shield segment is the main assembly component of shield construction and the innermost barrier of the tunnel, which bears the role of resisting soil pressure, groundwater pressure and some special loads. The shield segment is the permanent lining structure of the shield tunnel. The quality of the shield segment is directly related to the overall quality and safety of the tunnel, and affects the waterproof performance and durability of the tunnel. Concrete, usually refers to the use of cement as the cementitious material, sand and stone as the aggregate, mixed with water in a certain proportion, and obtained by mixing. Concrete has the characteristics of rich raw materials, low price and simple production process, which makes i...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C04B24/38C04B24/12C04B103/12C04B22/12C04B22/08C04B24/20C04B24/18C04B22/06
CPCC04B40/0039C04B2103/12C04B14/104C04B24/383C04B24/04C04B24/122C04B24/06C04B24/20C04B24/18C04B22/06C04B2103/65C04B22/12C04B22/087
Inventor刘承宏陈宇博张珍王颖梅刘永杰樊金宇贾新科张志强马栋明沈福良
OwnerCHINA RAILWAY NO 3 GRP CO LTD