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Nano-clay calcium hydroxide composite material for repairing and reinforcing as well as preparation and application of nano-clay calcium hydroxide composite material

A nano-clay and calcium hydroxide technology, applied in the field of stone cultural relic protection, can solve the problems of slow maintenance, low solubility, poor permeability, etc., and achieve the effects of uniform effect, no durability and high retention rate.

Active Publication Date: 2022-06-24
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inorganic materials also need to pay attention to the safety, adaptability, durability and non-derived damage of materials. The traditional cement materials used in the restoration and reinforcement projects of early grotto temples are likely to cause salt damage, excessive strength and rigidity. Traditional lime materials and rocks Better compatibility, but there are also problems such as low solubility, poor permeability, slow curing, low strength, and easy shrinkage

Method used

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  • Nano-clay calcium hydroxide composite material for repairing and reinforcing as well as preparation and application of nano-clay calcium hydroxide composite material
  • Nano-clay calcium hydroxide composite material for repairing and reinforcing as well as preparation and application of nano-clay calcium hydroxide composite material
  • Nano-clay calcium hydroxide composite material for repairing and reinforcing as well as preparation and application of nano-clay calcium hydroxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Nanometer metakaolin is obtained by calcining nanometer kaolin at 750°C for 5 hours. The obtained metakaolin is immersed in deionized water containing 5 wt % isopropanol to disperse uniformly, and the mass ratio of the solution to nano-metakaolin is 10:1. Then, to 100 ml of the nano-metakaolin dispersion liquid, 30 ml of 0.05M calcium acetate and 30 ml of 0.10M sodium hydroxide aqueous solution were successively added, and the reaction was carried out at room temperature for 10 minutes. The solid product was obtained by filtration and separation, washed three times with deionization, and dried at 100° C. to obtain nano-metakaolin calcium hydroxide composite powder.

[0034] (2) Disperse in isopropanol with a mass ratio of 10wt% to prepare a repairing protection solution. Under the conditions of 25°C and 45% humidity, the sandstone stones were treated 3 times by the spray coating method and maintained for 28 days.

[0035] (3) After treatment, the penetration depth...

Embodiment 2

[0037] (1) Nanometer metakaolin is obtained by calcining nanometer kaolin at 750°C for 5 hours. The obtained metakaolin was immersed in deionized water containing 5wt% n-propanol to disperse uniformly, and the mass ratio of the solution to nano-metakaolin was 20:1. Then, to 100 ml of the nano-metakaolin dispersion liquid, 30 ml of 0.08M calcium acetate and 30 ml of 0.20M aqueous ammonia solution were successively added, and the reaction was carried out at room temperature for 10 minutes. The solid product was obtained by filtration and separation, washed three times with deionization, and dried at 100° C. to obtain nano-metakaolin calcium hydroxide composite powder.

[0038] (2) Disperse in isopropanol with a mass ratio of 5wt% to prepare a repairing protection solution. Under the conditions of 25°C and 45% humidity, the sandstone stones were treated 3 times by the spray coating method and maintained for 28 days.

[0039] (3) After treatment, the penetration depth is 16.8mm,...

Embodiment 3

[0041](1) Nanometer metakaolin is obtained by calcining nanometer kaolin at 750°C for 5 hours. The obtained metakaolin is immersed in deionized water and dispersed evenly, and the mass ratio of the solution to nano-metakaolin is 30:1. Then, to 100 ml of the nano-metakaolin dispersion liquid, 30 ml of 0.05 calcium iodate and 30 ml of 0.15 M sodium bicarbonate aqueous solution were successively added, and the reaction was carried out at room temperature for 10 min. The solid product was obtained by filtration and separation, washed three times with deionization, and dried at 100° C. to obtain nano-metakaolin calcium hydroxide composite powder.

[0042] (2) Disperse in isopropanol with a mass ratio of 10wt% to prepare a repairing protection solution. Under the conditions of 25°C and 45% humidity, the sandstone stones were treated 3 times by the spray coating method and maintained for 28 days.

[0043] (3) After treatment, the penetration depth is 9.8mm, the degree of solidifica...

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Abstract

The invention relates to a nano-clay calcium hydroxide composite material for repairing and reinforcing as well as preparation and application of the nano-clay calcium hydroxide composite material. In-situ growth of nano-calcium hydroxide on a nano-clay sheet is realized by controlling the ionization degree of calcium ions and hydroxyl ions in a nano-clay dispersion liquid and the degree of supersaturation of a solution; further, the nano-clay calcium hydroxide composite material is prepared; after being uniformly dispersed in alcohol or alcohol-water composite liquid, the composite material is applied to functional protection such as repair and reinforcement of rock mass and surface of stone cultural relics. Compared with the prior art, the preparation method of the nano-clay calcium hydroxide repairing and reinforcing material is simple, the composite proportion of the clay and the calcium hydroxide is adjustable and controllable, the size is uniform, and the prepared protection liquid is high in dispersion, good in fluidity, high in permeability, good in compatibility with rock, free of soluble salt, appropriate in rigidity and hardness and appropriate in curing time. The method has high applicability, safety and durability and is free of derivative damage to stone cultural relic protection.

Description

technical field [0001] The invention belongs to the technical field of protection of stone cultural relics such as cave temples and the like, and relates to a nano-clay calcium hydroxide composite material for repairing and strengthening, and preparation and application thereof. Background technique [0002] Immovable cultural relics such as cave temples are often exposed to a variety of environments and conditions that are prone to weathering and degradation, including physical erosion, chemical corrosion, biological contamination, and even harmful materials used in past restoration interventions, resulting in peeling, weathering, and cracking. and discoloration and other damage. In order to enhance the durability of these artifacts, conservationists have made great efforts to develop conservation materials. In view of the spalling, weathering and cracking of stone cultural relics, the restoration and reinforcement of stone cultural relics is a kind of materials that are w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/50
CPCC04B41/5037C04B41/009C04B41/50C04B41/4535C04B41/463C04B14/04Y02W30/91
Inventor 张宏斌王金华闫宏彬王奕高佩华樊尧
Owner FUDAN UNIV
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