Modified cement slurry for concrete repair and preparation method thereof

A technology for modifying water and concrete, which is applied in the field of modified cement slurry for concrete repair and its preparation. It can solve the problems of unbearable, high cost of resin mortar or concrete, and achieve good durability, reduced bulk density, and increased folding pressure. than the effect

Active Publication Date: 2017-06-06
SHANGHAI LIYANG ROAD REINFORCEMENT TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This repair material can provide sufficient bonding force at the concrete interface and prevent the old concrete from being further corroded, but its disadvantage is that the cost of resin mortar or concrete is too high, and it is generally difficult to repair large areas or non-essential buildings. bear

Method used

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  • Modified cement slurry for concrete repair and preparation method thereof
  • Modified cement slurry for concrete repair and preparation method thereof
  • Modified cement slurry for concrete repair and preparation method thereof

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preparation example Construction

[0026] The present invention also provides a method for preparing the above-mentioned modified cement slurry for concrete repair, including the following steps:

[0027] a) Select a predetermined amount of cement, aggregate and fly ash to mix;

[0028] b) Add a predetermined amount of styrene-butadiene emulsion, defoamer and early strength agent to tap water, and then mix with the mixed material water in step a); the predetermined weight percentage of each component is controlled as follows: cement 30~70 %; aggregate 12.5%~52.5%; fly ash 12~15%; styrene-butadiene emulsion 5%~15%; early strength agent 0.25~5.5%; defoamer 0.25~1%;

[0029] c) Control the fluidity of the mortar within the range of 140±5mm, and then measure the fluidity and bulk density of the freshly mixed mortar respectively, and confirm that the fluidity and bulk density of the freshly mixed mortar are roughly the same as the concrete to be repaired, and then the pouring is carried out. repair.

[0030] In the prepara...

experiment example

[0034] 1. Raw materials

[0035] Cement: Super early strength sulfoaluminate cement was used in the test.

[0036] Aggregate: Standard sand used for mortar test.

[0037] Fly ash: Yahekou Class I fly ash, 45 micron sieve rate is 6.56%, water demand rate is 92%, density is 2.32g / cm 3 .

[0038] Polymer: The polymer adopts styrene-butadiene emulsion SD623 from Shanghai Gaoqiao BASF Dispersion Co., Ltd., with a solid content of 50%-52%, a PH value of 7.8-10, and a density of 1.01g / cm 3 , The average particle size is 150nm, and the glass transition temperature is 13°C.

[0039] The defoamer is a mixture of liquid liquid hydrogen compound, polyethylene glycol and amorphous silica, and the weight ratio of the liquid liquid hydrogen compound, polyethylene glycol and amorphous silica is 0.5:2.5:2.5, The appearance density is about 340g / L.

[0040] Tap water is used for the mixing water.

[0041] 2. Sample preparation and testing

[0042] The preparation method refers to the cement paste test meth...

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Abstract

The invention discloses a modified cement mortar for concrete repair and a preparation method thereof. The preparation method comprises the following steps: a) weighing and mixing predetermined amounts of cement, aggregate and fly ash; b) adding predetermined amounts of a butylbenzene emulsion, an antifoaming agent and an early strength agent into tap water and mixing the obtained solution with the mixture prepared in the step a); and c) controlling the fluidity of mortar to be in a range of 140 + / - 5 mm, separately measuring flow-table fluidity and unit weight of the newly-mixed mortar and carrying out casting molding for repairing when the determined flow-table fluidity and unit weight of the newly-mixed mortar are substantially identical to to-be-repaired concrete. According to the modified cement mortar for concrete repair and the preparation method thereof, initial set of the cement mortar can be accelerated, the water-reducing rate of the mortar can be increased, the unit weight of the newly-mixed mortar can be decreased, the ratio of bending-compressive strength of the mortar can be obviously enhanced, and rapidly repaired concrete has better durability.

Description

Technical field [0001] The invention relates to a cement slurry and a preparation method thereof, in particular to a modified cement slurry for concrete repair and a preparation method thereof. Background technique [0002] It is not uncommon for concrete buildings and components to be corroded and damaged during use. Many concretes in humid or industrial environments are showing signs of corrosion damage. In non-ferrous metallurgy, chemical, paper and other industrial enterprises, 20% to 70% of concrete structures are subject to various corrosive media to cause corrosion of structural materials. The reconstruction of corroded structures is a costly project. It not only consumes money A large amount of funds. And will also cause huge economic losses in production or life due to the decommissioning of buildings: According to relevant data, this economic loss accounts for about 1.25% of national income. For example, the repair and reconstruction costs of concrete projects in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
Inventor 季晓丽
Owner SHANGHAI LIYANG ROAD REINFORCEMENT TECH
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