US 11,685,698 B2 · Device and method for reinforcing weathered stone relics by using low temperature plasma to activate calcium hydroxide in carbon dioxide atmosphere

Abstract

The invention provides a device and a method for reinforcing weathered stone relics by using low temperature plasma to activate calcium hydroxide in a carbon dioxide atmosphere. Based on the low temperature plasma physics and the principles of the relics conservation, the invention applies the technology of low temperature plasma to relics conservation, and especially to the reinforcement of weathered stone relics by activating calcium hydroxide. According to the application, using low temperature plasma source loaded with carbon dioxide to active calcium hydroxide can realize the carbonation and precipitation of calcium hydroxide within 1 min-2 min, and reinforce the weathered stone relics. The application has the advantages of safety, high efficiency, non-damage, and no side effects.

Claims5

Dependent claims

A method for reinforcing weathered stone relics by using low temperature plasma to activate calcium hydroxide in carbon dioxide atmosphere, comprising the following steps:

(1) removing attachments on a surface of stone relics;
(2) dispersing calcium hydroxide in an isopropanol aqueous solution with a volume concentration of about 5%-5.5% to obtain a saturated reinforcement solution, wherein the calcium hydroxide has a particle size of lower than about 6.5 μm;
(3) spraying the reinforcement solution obtained in step (2) on a weathered layer of the stone relics;
(4) spraying the stone relics sprayed with reinforcement solution obtained in step (3) with cold plasma with a temperature lower than about 50° C. generated from the nozzle of a low temperature plasma source loaded with carbon dioxide;
and
(5) repeating steps (3) and (4) 10-15 times.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/036,499Filed 29 Sep 2020

Published

US 2021/0179504 A117 Jun 2021

Granted

27 Jun 2023

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

C04B 41/501
With salts or salty compositions, e.g. for salt glazing: containing carbon in the anion, e.g. carbonates
C04B 41/009
After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone: characterised by the material treated
C04B 41/4558
The coating or impregnating process including a chemical conversion or reaction: coating or impregnating involving the chemical conversion of an…
C04B
Lime, magnesia

Device and method for reinforcing weathered stone relics by using low temperature plasma to activate calcium hydroxide in carbon dioxide atmosphere

Life of this patent

Device and method for reinforcing weathered stone relics by using low temperature plasma to activate calcium hydroxide in carbon dioxide atmosphere

Life of this patent

Abstract

Claims5