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Retarding type high-fluidity high-strength underwater concrete additive and preparation method thereof

An underwater concrete and high fluidity technology, applied in the field of building materials, can solve problems such as not suitable for long-distance transportation and construction, lack of research on durability such as permeability, and unsatisfactory concrete material systems, so as to improve volume stability and durability, improving volume stability, and improving durability

Active Publication Date: 2014-10-29
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, a single concrete material system obviously cannot meet the above requirements
However, there are single-mixed cellulose and polypropylene viscosifying substances in the relevant patents to prepare underwater concrete, but the resulting concrete has low strength, and the water-to-land strength ratio is only 65%-70% (7d) and 70%-75 %(28d), and the slump loss of concrete is large, so it is not suitable for long-distance transportation and construction
Looking at the research and application results of underwater non-dispersible concrete in the past, the performance of the prepared underwater non-dispersible concrete has limitations, and the strength level of the poured underwater concrete is generally low (below C30), and the water Frost resistance of non-dispersible concrete, anti-Cl - There is also a lack of research on durability such as permeability

Method used

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  • Retarding type high-fluidity high-strength underwater concrete additive and preparation method thereof
  • Retarding type high-fluidity high-strength underwater concrete additive and preparation method thereof
  • Retarding type high-fluidity high-strength underwater concrete additive and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A retarding type high-fluidity high-strength underwater concrete additive, which is obtained by grinding metakaolin and a composite modifier in a ball mill for 30 minutes, wherein the mass ratio of metakaolin to the composite modifier is 15:1, the described The composite modifying agent is prepared by mixing polyacrylamide, polycarboxylate water reducer and sucrose in the order of 80%, 15% and 5% by mass.

[0022] Taking the mortar specimen as the object of investigation, metakaolin was used to replace the cementitious material with 6%, 8%, and 12% respectively, and 1% water reducing agent was added to prepare the mortar. River sand (passed through a 2.36mm sieve) and the retarded high-fluidity high-strength underwater concrete additive of Example 1 were added at 6%, 8%, and 12% respectively, and the water-cement ratio was 0.45.

[0023] According to GB / T 2429-2005 "Measurement Method for Fluidity of Cement Mortar Sand", test the fluidity of the mixture of the reference...

Embodiment 2

[0034] A retarding type high-fluidity and high-strength underwater concrete additive, which is ground in a ball mill for 120 minutes by metakaolin and a composite modifier, wherein the mass ratio of metakaolin to the composite modifier is 20:1, and the composite The modifying agent is prepared by mixing polyacrylamide, polycarboxylate water reducer and sucrose in the order of 75%, 20% and 5% by mass.

[0035] Taking the concrete specimen as the object of investigation, the additives in Example 2 are used to replace the cementitious material in an equivalent amount of 10% to configure the concrete. Slump and expansion; according to GB / T 50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", test the benchmark sample and the additives of Example 2 with a universal pressure testing machine for 7 days and 28 days of compressive strength; concrete anti-dispersion The test was carried out according to Q / CNPC92-2003. The cement loss was 1.1%, the pH wa...

Embodiment 3

[0037] A retarding type high-fluidity high-strength underwater concrete additive, which is obtained by grinding metakaolin and a composite modifier for 90 minutes in a ball mill, wherein the mass ratio of metakaolin to the composite modifier is 30:1, the described The composite modifier is prepared by mixing polyacrylamide, polycarboxylate water reducer and sucrose in the order of 70%, 25% and 5% by mass.

[0038] Taking concrete specimens as the object of investigation, metakaolin-based additives are used to replace cementitious materials in an equivalent amount of 12% to configure concrete, and the slump of freshly mixed concrete is tested according to GB / T 50080-2002 "Standard for Test Methods for Performance of Ordinary Concrete Mixtures" and expansion degree; in accordance with GB / T 50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", use a universal pressure testing machine to test the 7-day and 28-day compressive strength of the benchmark...

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a retarding type high-fluidity high-strength underwater concrete additive. The additive can effectively improve the strength and dispersion resistance of concrete and has the advantages of simple preparation process, low production cost and the like. The additive is characterized by comprising metakaolin and a composite modifier. The mass ratio of the metakaolin to the composite modifier is (50:1)-(15:1); the composite modifier is prepared by mixing 70-85% of polyacrylamide, 10-20% of superplasticizer and 5-15% of organic water-soluble polysaccharide substances all by mass based on a total of 100%. As an additive for underwater concrete, the additive can improve the working performance and dispersion resistance of underwater concrete and delay the setting time; and the strength at each age, particularly the early age strength of underwater concrete is remarkably improved. Meanwhile, the volume stability of underwater concrete can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a slow-setting high-fluidity high-strength underwater concrete additive and a preparation method thereof. Background technique [0002] Along with the development and progress of human society and civilization, as the land resources available for development become less and less, the tentacles of the development of human civilization will extend to the ocean, so the 21st century will be the century of ocean development. Concrete water The next construction will be more and more. The underwater concrete structure is very complex. Therefore, in addition to the strength of concrete, simple construction technology, reasonable economy, good durability and no pollution to the environment are also required. Concrete is still one of the most important and most used construction materials in underwater engineering, and the performance of underwater concrete will d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/10C04B28/00C04B111/74
Inventor 王桂明包明曾伟能水中和杨增良梅明军
Owner WUHAN UNIV OF TECH
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