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Underwater repairing material based on seawater and coral sand and preparation method thereof

A technology for repairing materials and coral sand, applied in the field of building materials, can solve problems such as scarcity of sand and gravel resources, and achieve the effects of improving cohesion and fluidity, limiting deformation of mortar, and improving compressive strength and bonding performance.

Active Publication Date: 2020-11-03
中铁桥研科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention utilizes abundant coral sand resources in the marine environment to prepare an underwater repair material based on seawater and coral sand to solve the problem of scarcity of traditional sand resources in coastal areas, and has broad application prospects and economic and social benefits

Method used

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  • Underwater repairing material based on seawater and coral sand and preparation method thereof
  • Underwater repairing material based on seawater and coral sand and preparation method thereof
  • Underwater repairing material based on seawater and coral sand and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1. Preparation of modified coral sand:

[0040] Crush the coral sand to an average particle size of 0.35-0.25 mm, spread it evenly and send it to the spray area; atomize monosilane into negatively charged tiny particles, and use a compressed air pressure of 0.7 MPa and 150 kV electric field for atomization. Atomization humidity is 8g / mm 2 Atomized for 15 minutes under certain conditions to obtain coral sand coated with a hydrophobic coating, that is, modified coral sand. The treatment process is similar to the glaze spraying process of ceramic preparation. Monosilane is a permeable coating, which can not only play a "coating role" to form an organic film on the surface of coral sand, inhibit the removal of erosive ions in undiluted coral sand, but also The alkaline substances in the mortar act to form a hydrophobic film, which reduces the diffusion coefficient of chloride ions in the structure.

[0041] 2. Preparation of redispersible latex powder:

[0042] Add polyp...

Embodiment 2

[0054] 1. Preparation of modified coral sand:

[0055] Crush the coral sand to an average particle size of 0.35-0.25mm, spread it evenly and send it to the spray area; atomize the monosilane into negatively charged tiny particles, in a 160 kV electric field, the compressed air pressure for atomization is 0.6MPa, Atomization humidity is 9g / mm 2 Atomized for 20 minutes under certain conditions to obtain coral sand coated with a hydrophobic coating, that is, modified coral sand.

[0056] 2. Preparation of redispersible latex powder:

[0057] Add polypropylene acetate (weight-average molecular weight: 15,000), polyvinyl alcohol (weight-average molecular weight: 160,000) and methyl methacrylate into the reactor at a weight ratio of 72:16:1 to obtain mixed solution A; Polyvinyl alcohol (corresponding to 1.2wt% of mixed solution A) aqueous solution into the reactor, and turn on the stirrer to stir for 25min, then raise the temperature to 90 ° C, dropwise add azobisisobutyronitrile ...

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Abstract

The invention relates to an underwater repairing material based on seawater and coral sand and a preparation method thereof. The underwater repairing material is prepared from sulphoaluminate cement,maritime work Portland cement, fly ash, redispersible latex powder, modified epoxy resin, an organic resist, an expanding agent, an underwater anti-dispersing agent, modified coral sand and a high-efficiency polycarboxylate superplasticizer, wherein the modified coral sand is coral sand of which the surface is coated with a hydrophobic coating, and the modified epoxy resin is waterborne epoxy resin coupled with nano polysulfide rubber powder and nano graphite powder. In the invention, artificial broken coral sand is used for replacing natural river sand, and cement mortar is compounded with epoxy resin, so that the bonding performance of the underwater repairing material is improved, slurry loss is reduced by compounding an underwater anti-dispersing agent and an organic corrosion inhibitor, a passive film is formed on the surface of a reinforcing steel bar; in addition, a composite expanding agent is added, so that the multiple expansion sources continuously expand to improve the fitness between the underwater repairing material and an original component and block a harmful ion erosion channel.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to an underwater repair material based on seawater and coral sand and a preparation method thereof. Background technique [0002] With the development of society and economy, in recent years, a large number of cross-sea bridges and offshore facilities have been built in coastal waters, such as offshore oil platforms, ports, and wind power stations. However, these concrete structures are always in a complex environment during the service period, such as the non-stop and uneven scour of the sea, the radiation of strong ultraviolet rays, and the strong corrosion of various corrosive ions, etc. The deterioration of performance greatly affects the service life of concrete structures. Considering the large size of the concrete structure, its remaining service life after damage, and the cost of rebuilding, the existing technology generally does not scrap it, but uses underwater repair ma...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B24/40C04B20/10C04B24/42C04B24/26C04B22/14C04B14/28C04B24/28C04B14/02C04B103/61C04B111/24C04B111/26C04B111/72C04B111/74
CPCC04B20/1055C04B28/065C04B40/0039C04B2103/0057C04B2103/0068C04B2103/61C04B2111/24C04B2111/26C04B2111/72C04B2111/74C04B7/02C04B18/08C04B24/281C04B24/40C04B24/28C04B14/024C04B2103/0082C04B14/28C04B2103/302C04B22/0026C04B22/066C04B22/143C04B22/148C04B22/06C04B24/32C04B24/42C04B24/121C04B24/2652C04B22/0093C04B22/10C04B24/2623C04B24/2641C04B14/062
Inventor 陈露一郑丽包嘉诚黄有强张志豪李信
Owner 中铁桥研科技有限公司
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