Efficient corrosion inhibifing water reducing and plasticity keeping agent for steel pipe concrete

A technology of steel tube concrete and water reducer, which is applied in the field of concrete admixtures, and can solve the problems of high probability of debonding, reduction of structural integrity of steel tube concrete, and deterioration of structural mechanical properties.

Inactive Publication Date: 2006-05-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the vicinity of the vault of the steel pipe arch, the phenomenon of air adsorption and enrichment caused by concrete gravity settlement and pumping pressure is more serious, so the probability of debonding is greater, thereby reducing the integrity of the steel pipe concrete structure and deteriorating Its struct

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] 1). Selection of polycarboxylate superplasticizer: The polyoxyethylene group (that is, the E0 addition number) as one of the side chains in the molecular structure is 68, and the molar ratio of carboxylic acid group to ester group in the molecule (m / n) is a polycarboxylate water-reducer of 2, and its average molecular weight is 11400; 2). According to polycarboxylate water-reducer: sodium gluconate: zinc sulfate=94.5%: 5%: 0.5% solid mass proportioning is accurate Weigh polycarboxylate superplasticizer, sodium gluconate, zinc sulfate, add sodium gluconate and zinc sulfate in sequence to the weighed polycarboxylate superplasticizer and stir to fully dissolve them, and adjust the solid content of the solution to 33% by adding water. % and mix evenly to get the product. A certain amount of this product is mixed into the C50 concrete filled steel tube with the mix ratio shown in Table 2 below to obtain a concrete filled steel tube material with good mechanical properties a...

example 2

[0014] 1). Selection of polycarboxylate superplasticizer: The polyoxyethylene group (ie, EO addition number) as one of the side chains in the molecular structure is 68, and the molar ratio of carboxylic acid group to ester group in the molecule (m / n) is a polycarboxylate water reducer of 2, and its average molecular weight is 11400;

[0015] 2). Accurately weigh polycarboxylate water reducer, sodium gluconate, zinc sulfate, and sodium gluconate according to the ratio of polycarboxylate water reducer: sodium gluconate: zinc sulfate = 90%: 8%: 2% solid mass ratio and zinc sulfate are added in sequence to the weighed polycarboxylate superplasticizer and stirred to make it fully dissolved, and the solid content of the solution is adjusted to 33% by adding water and mixed evenly to obtain the product. A certain amount of this product is mixed into the C50 concrete filled steel tube with the mix ratio shown in Table 3 to obtain a concrete filled steel tube material with good mechan...

example 3

[0018] 1). Selection of polycarboxylate superplasticizer: The polyoxyethylene group (ie, EO addition number) as one of the side chains in the molecular structure is 68, and the molar ratio of carboxylic acid group to ester group in the molecule (m / n) is a polycarboxylate water-reducer of 2, and its average molecular weight is 11400; 2). According to polycarboxylate water-reducer: sodium gluconate: zinc sulfate=87%: 10%: 3% solid mass proportioning is accurate Weigh polycarboxylate superplasticizer, sodium gluconate, zinc sulfate, add sodium gluconate and zinc sulfate in sequence to the weighed polycarboxylate superplasticizer and stir to fully dissolve them, and adjust the solid content of the solution to 33% by adding water. % and mix evenly to get the product. A certain amount of this product is mixed into the C50 steel tube concrete with the mix ratio shown in Table 4 to obtain a steel tube concrete material with good mechanical properties and working properties. The raw ...

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Abstract

The efficient set retarding water reducing and plasticity keeping agent for steel pipe concrete is water solution with solid content of 30-36 % compounding polycarboxylic acid water reducing agent 87-94.5 wt%, sodium gluconate 5-10 wt% and zinc sulfate 0.5-3 wt%. The efficient set retarding water reducing and plasticity keeping agent of the present invention has the advantages of low gas introducing amount, high water reducing rate and high plasticity keeping performance, and can raise the flowability and construction performance of newly stirred steel pipe concrete, lower the air content of concrete, improve the adhesion between steel pipe wall and concrete, raise the strength and durability of steel pipe concrete and raise the bearing capacity of the steel pipe concrete structure.

Description

technical field [0001] The invention belongs to the category of concrete admixtures, and in particular relates to a retarding, high-efficiency, water-reducing and plastic-retaining agent for steel tube concrete. Background technique [0002] Due to its outstanding advantages and characteristics, the CFST structure has broad application prospects in modern high-rise buildings and long-span arch bridges. The construction technology of concrete-filled steel tubes mostly adopts the pumping jacking method, so special requirements are put forward for the working performance and hardening performance indicators of concrete-filled steel tubes: firstly, the concrete is required to have good pumpability and operability (the initial setting time must meet the requirements of concrete The time required for pumping jacking and the slump loss of fresh concrete in a long period of time should be small); second, the concrete is required to have suitable compensation shrinkage performance an...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B22/14C04B24/04C04B103/30
Inventor 胡曙光丁庆军彭艳周吕林女何永佳王红喜邹定华彭波王发洲曹传林马立军周明凯
Owner WUHAN UNIV OF TECH
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