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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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  • Abstract
  • Description
  • Claims
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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 aluminum powder gas is not uniform, and the amount of gas generation is difficult to control. It is clearly stipulated in the current relevant specifications that it is strictly forbidden to mix aluminum powder in the grouting material

Method used

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

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Comparison scheme
Effect test

Embodiment 1

[0037] The post-tensioned prestressed concrete beam grouting agent for highway bridges and culverts of this embodiment has a weight component of: polycarboxylate powder water reducer 5%, plastic expansion agent 15%, calcium sulfoaluminate and anhydrite 60% additive, 0.18% polyvinyl alcohol rheology additive, 0.20% xanthan gum water retaining agent, 0.10% composite retarder of citric acid and sodium gluconate, 0.30% organic silicon defoamer, ultrafine slag and finely ground calcined The kaolin mixture is 19.22%, and the above-mentioned components are accurately weighed by weight percentage and uniformly stirred to obtain the present invention.

Embodiment 2

[0039] The post-tensioned prestressed concrete beam grouting agent for highway bridges and culverts in this embodiment has the following components by weight: 8% composite water reducing agent of polycarboxylic acid powder and melamine powder, 20% of plastic expansion agent, calcium sulfoaluminate and hard 50% expansion agent prepared by gypsum, 0.30% sodium polyacrylate rheology additive, 0.25% redispersible latex powder water retention agent, 0.35% sodium tripolyphosphate retarder, 0.40% organic silicon defoamer, finely ground slag and Silicon powder mixture 20.7%, the present invention is obtained by accurately weighing the above-mentioned components by weight percentage and stirring uniformly.

Embodiment 3

[0041] The post-tensioned prestressed concrete beam grouting agent for highway bridges and culverts in this embodiment has the following components by weight: 15% of naphthalene-based powder and calcium lignosulfonate composite water reducer, 25% of plastic expansion agent, calcium aluminate, Dickite and anhydrite compound expansion agent 50%, organic bentonite and polyvinyl alcohol compound rheological additive 0.45%, Wenlun glue water retention agent 0.45%, citric acid and sodium gluconate compound retarder 0.10%, organic fluoride 0.40% of defoaming agent, 8.6% of the mixture of silicon powder and zeolite powder, the above-mentioned components are accurately weighed according to the weight percentage, and the invention is obtained by stirring evenly.

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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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