Special grouting agent for post-tensioned prestressed concrete beams of highway bridges and culverts and preparation method thereof

A post-tensioned prestressed, concrete beam technology, applied in the field of building materials, can solve the problems of limited expansion performance, uneven gas generation of aluminum powder, difficult gas generation, etc., and achieves good cement adaptability, simple construction operation, and excellent water retention. performance effect

Active Publication Date: 2012-07-18
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN1559960A discloses a high-performance grouting admixture for post-tensioned prestressed concrete, wherein the early stage of the cement paste is compensated by incorporating aluminum powder Shrinkage, but the

Method used

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  • Special grouting agent for post-tensioned prestressed concrete beams of highway bridges and culverts and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1

[0037] The special pore grouting agent for post-tensioned prestressed concrete beams of highway bridges and culverts of this embodiment is composed of: polycarboxylic acid powder water reducing agent 5%, plastic expansion agent 15%, expansion prepared by calcium sulfoaluminate and anhydrite 60%, polyvinyl alcohol rheological additive 0.18%, xanthan gum water retention agent 0.20%, citric acid and sodium gluconate composite retarder 0.10%, organic silicon defoamer 0.30%, ultra-fine slag and ground calcination The kaolin mixture is 19.22%, the above-mentioned components are accurately weighed according to weight percentages and stirred uniformly to prepare the present invention.

Example Embodiment

[0038] Example 2

[0039] The special pore grouting agent for post-tensioned prestressed concrete beams of highway bridges and culverts of this embodiment is composed of polycarboxylic acid powder and melamine powder composite water reducing agent 8%, plastic expansion agent 20%, calcium sulfoaluminate and hard Gypsum-prepared expansion agent 50%, sodium polyacrylate rheology additive 0.30%, redispersible latex powder water retention agent 0.25%, sodium tripolyphosphate retarder 0.35%, organic silicon defoamer 0.40%, ground slag and The silicon powder mixture is 20.7%, the above-mentioned components are accurately weighed according to the weight percentage and stirred uniformly to prepare the present invention.

Example Embodiment

[0040] Example 3

[0041] The special pore grouting agent for post-tensioned prestressed concrete beams of highway bridges and culverts of this embodiment is composed of: naphthalene powder and calcium lignosulfonate composite water reducing agent 15%, plastic expansion agent 25%, calcium aluminate, Dickite and anhydrite prepared expansion agent 50%, organic bentonite and polyvinyl alcohol compound rheological additive 0.45%, warm wheel glue water retention agent 0.45%, citric acid and sodium gluconate compound retarder 0.10%, organic fluoride 0.40% of defoamer, 8.6% of the mixture of silicon powder and zeolite powder, the above-mentioned components are accurately weighed according to the weight percentage and uniformly stirred to prepare the present invention.

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Abstract

The invention discloses a special grouting agent for post-tensioned prestressed concrete beams of highway bridges and culverts and a preparation method thereof. The grouting agent comprises the ingredients of a water reducing agent, a plastic expanding agent, an expanding agent, a flowing deformation assistant, a water-retaining agent, a retarder, a defoamer, a superfine active mineral admixture and the like. Low ratio of water to glue (0.26-0.28), high fluidity (the initial fluidity being equal to or less than 17s), no bleeding (free bleeding rate in 24hours being 0%) and early expanding (free expanding rate in 3hours being 0-2%) of grouting materials are realized after the grouting agent is added, so that quality reliability and durability of post-tensioned prestressed duct grouting areimproved, the problems of non-full and incompact grouting in duct grouting are fundamentally solved and the service life of prestressed concrete structure bridges is prolonged to realize a qualitative leap of the grouting material performance.

Description

technical field [0001] The invention belongs to the technical application field of building materials, and is mainly suitable for channel grouting of post-tensioned prestressed concrete beams of highway bridges and culverts, in particular a special channel grouting agent for post-tensioned prestressed concrete beams of highway bridges and culverts. The grouting agent can also be applied to the grouting construction of prestressed reinforced concrete channels in large-scale projects such as railways and nuclear power plants. Background technique [0002] In the construction of highway bridges, prestressed concrete structures of various systems have been developed by leaps and bounds, and post-tensioned bonded prestressed structures occupy a more important position today. In the post-tensioned prestressed concrete structure, in order to prevent the prestressed steel bars from corroding and to combine the prestressed steel bars with the beam body concrete as a whole, it is gene...

Claims

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Application Information

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IPC IPC(8): C04B24/40C04B24/26C04B24/38
Inventor 王冬陈国新祝烨然黄国泓唐修生王毅温金保刘兴荣蔡明高欣欣杜志芹付丹华
Owner NANJING RUIDI HIGH TECH
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