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Modified cement slurry for rapidly repairing concrete

A technology for modifying water and concrete, applied in the field of cement slurry, can solve the problems of unbearable buildings, high cost of resin mortar or concrete, and achieve the effects of reduced bulk density, good durability, and accelerated initial setting.

Active Publication Date: 2015-12-09
SHANGHAI LIYANG ROAD REINFORCEMENT TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of repair material can provide sufficient bonding force at the concrete interface and can prevent the old concrete from further corrosion, but because the cost of resin mortar or concrete is too high, it is generally unaffordable for large areas of repair or non-critical buildings

Method used

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  • Modified cement slurry for rapidly repairing concrete
  • Modified cement slurry for rapidly repairing concrete
  • Modified cement slurry for rapidly repairing concrete

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experiment example

[0032] 1. Raw materials

[0033] Cement: Super early strength sulfoaluminate cement was used in the test.

[0034] Aggregate: standard sand for mortar test.

[0035] Fly ash: Yahekou Class I fly ash, 45 micron sieve rate 6.56%, water demand rate 92%, density 2.32g / cm 3 .

[0036] Polymer: Use latex powder as the polymer, and the latex powder is preferably polyvinyl acetate redispersible latex powder RE5044N.

[0037] The antifoaming agent is a liquid liquid hydrogen compound, a mixture of polyethylene glycol and non-crystalline silicon dioxide, and the weight ratio of the liquid liquid hydrogen compound, polyethylene glycol and non-crystalline silicon dioxide is 0.5:2.5:2.5, The apparent density is about 340g / L.

[0038] Mixing water adopts tap water.

[0039] 2. Sample preparation and testing

[0040] The preparation method refers to the cement slurry test method of GBJ56-83. In this test, the mortar used for flexural strength, compressive strength, bulk density, dry s...

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Abstract

The invention discloses a modified cement slurry for rapidly repairing concrete, comprising following components in weight ratio: 30-70% of cement, 15-55% of aggregates, 12-15% of fly ash, 2.5-7.5% of latex powder, 0.25-5.5% of early strength admixture, and 0.25-1% of antifoaming agent. The modified cement slurry also comprises an expanding agent by weight of 0-2.5% of total weight and a thickening agent by weight of 0-2.5% of total weight. The modified cement slurry for rapidly repairing concrete can quicken the initial set of the cement slurry, promote water reducing rate of mortar, reduce unit weight of the newly-stirred mortar, and obviously promote flexural compression ratio, binding intensity and chloride ion penetration resistance of slurry, and the durability of concrete after rapidly repairing.

Description

technical field [0001] The invention relates to a cement slurry, in particular to a modified cement slurry for quick repair of concrete. Background technique [0002] Concrete and reinforced concrete structures are famous for their durability, but they are damaged due to improper design, poor construction quality or the influence of the environment used, such as chloride ion erosion, freezing and carbonization. Although these damages are initially superficial, However, as time goes by, they will extend to the inner structural materials, affect the service life of the building, and even affect the safety of the structure. There have been large-scale capital construction in my country for more than 20 years, and there are a large number of concrete projects that need to be repaired urgently. It is of great significance to develop a concrete repair material with superior performance and reasonable price. [0003] Partial repair of corroded concrete can not only get twice the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B18/08C04B18/24
CPCY02W30/91
Inventor 季晓丽
Owner SHANGHAI LIYANG ROAD REINFORCEMENT TECH
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