Cement-base material for repairing crack of bridge

A crack repair, cement-based technology, applied in the field of building materials, can solve the problems of no concrete bridge deck, high economic cost, restricted traffic, etc., to achieve the effects of avoiding particle settlement, stable volume, and enhanced fluidity

Inactive Publication Date: 2007-07-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the past, there were no special repair materials for concrete bridge decks. When the bridge deck concrete was damaged to a certain extent and could not continue to serve, traffic was often stopped and the entire bridge deck was replaced. This not only severely restricted traffic, but also cost a lot of money

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1, cement-based bridge deck crack repair materials are 39.14% of ordinary Portland cement, 5.87% of high alumina cement, 0.08% of cellulose, 1.18% of polyvinyl acetate latex powder, and high-efficiency water reducer of naphthalenesulfonic acid formaldehyde condensation product 0.27%, 2.35% sulfoaluminate expansion agent, 0.23% polypropylene fiber, 50.88% quartz sand (0-2mm). After adding water accounting for 16% of the weight of the dry powder material and stirring, the fluidity of the product can reach 200mm, the initial setting time is 40min, the final setting time is 65min, the compressive strength reaches 41MPa after hardening, and the flexural strength reaches 8.8MPa. The tensile strength reaches 4.1 MPa, and the compressive strength decrease rate is 0% after 7 freeze-thaw cycles.

Embodiment 2

[0031] Embodiment 2, cement-based bridge deck crack repair materials are 42.66% of slag cement, 8.53% of high alumina cement, 0.13% of cellulose, 2.13% of polyvinyl acetate latex powder, 0.34% of sulfamate high-efficiency water reducer, sulfur aluminum Salt expansion agent 3.00%, polypropylene fiber 0.55%, quartz sand (0-2mm) 42.66%. After adding water accounting for 15% of the weight of the dry powder material and stirring, the fluidity of the product can reach 250mm, the initial setting time is 25min, the final setting time is 38min, and the compressive strength reaches 40MPa and the flexural strength reaches 10.1MPa 28 days after hardening. The tensile strength reaches 4.9MPa, and the reduction rate of compressive strength is 0% after 50 freeze-thaw cycles.

Embodiment 3

[0032] Embodiment 3, the cement-based bridge deck crack repair material is composed of 31.66% of composite cement, 11.08% of high alumina cement, 0.0158% of cellulose, 1.9% of polyvinyl acetate latex powder, and 0.7912% of naphthalenesulfonic acid formaldehyde condensate superplasticizer, It is formulated with 3.17% sulfoaluminate expansion agent, 1.42% polypropylene fiber and 49.963% quartz sand (0-2mm). After adding water accounting for 36% of the weight of the dry powder material and stirring, the fluidity of the product can reach 180mm, the initial setting time is 36min, the final setting time is 65min, the compressive strength reaches 38MPa after hardening, and the flexural strength reaches 8.2MPa. The tensile strength is up to 3.9MPa, and the reduction rate of compressive strength is 0% after 7 freeze-thaw cycles.

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Abstract

The invention relates to a cement-based materialfor repairing crack of bridge, composed of Portland cement series, high alumina cement, fibrin, polyvinyl acetate latex powder, water reducer, sulphoaluminate sweller, polypropylene fibre and quartz sand. It can very efficiently repair the cracks of bridge-surface concrete caused by various reasons, thus improving wearability, flexibility, shock resistance, anti-permeability, resistance to corrosiveness of chemical substances, and carbonizing resistance of the concrete by a large margin, and prolonging the service life of the bridge-surface concrete. It is applied to repair the cracks of concrete bridge surfaces, concrete road surfaces, and other engineering.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cement-based bridge deck crack repairing material and a using method thereof. Background technique [0002] The bridge deck is a large-scale thin-slab concrete structure. After the bridge deck concrete is poured and constructed, if maintenance is not taken care of, plastic cracking will easily occur, and cracking will also occur due to various reasons during use. Most of the interior of the concrete bridge deck is equipped with a certain proportion of steel bars. The existence of cracks will cause the internal steel bars to corrode quickly and cause expansion, resulting in further crack expansion. In addition, due to the existence of cracks, not only rainwater and condensed water are easy to infiltrate, but what is even more frightening is that external corrosive media, such as acids, alkalis, and salts, will penetrate into the bridge deck concrete along ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/06C04B14/06C04B24/38C04B26/18C04B22/14C04B16/06C04B24/16C04B24/24
Inventor 孙振平蒋正武
Owner TONGJI UNIV
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