EP-4737421-A1 - POZZOLANIC MATERIAL, PREPARING METHOD THEREOF AND PRODUCT THEREOF

Abstract

The present invention provides a method for preparing a pozzolanic material, which includes the following steps: collecting waste glass; crushing the waste glass into waste glass particles having a predetermined size; and grinding the waste glass particles to obtain finely ground glass powder having a predetermined particle size and a predetermined particle size distribution for serving as the pozzolanic material. The present invention further provides a pozzolanic material prepared by the method, as well as a product manufactured using the pozzolanic material.

Inventors

• CHIU, YU-WEN
• LIN, CHUNG-WEN
• WU, Ming-fu
• CHANG, CHENG-HSIN
• SHIH, NAI-CHUAN
• SYU, WEI-DONG
• CHEN, I-TING
• LI, Song-ming

Assignees

• TCC Group Holdings Co., Ltd.

Dates

Publication Date

20260506

Application Date

20251022

Claims (15)

1. A method for preparing a pozzolanic material, comprising: collecting waste glass; crushing the waste glass into waste glass particles having a predetermined size; and grinding the waste glass particles to obtain finely ground glass powder having a predetermined particle size and a predetermined particle size distribution for serving as the pozzolanic material.
2. The method according to claim 1, wherein the predetermined size of the waste glass particles is less than about 10 mm.
3. The method according to one of the preceding claims, wherein the predetermined particle size of the finely ground glass powder is less than about 45 µm.
4. The method according to one of the preceding claims, wherein the predetermined particle size distribution of the finely ground glass powder has a sieve residue of less than about 5%.
5. The method according to one of the preceding claims, wherein the finely ground glass powder is further treated using a chemical auxiliary agent.
6. The method according to claim 5, wherein the chemical auxiliary agent comprises diethylene glycol, triethanolamine, triisopropanolamine, or any combination thereof.
7. The method according to one of the preceding claims, wherein the finely ground glass powder has a predetermined specific surface area, and preferably, the predetermined specific surface area ranges from about 2500 cm 2 /g to about 8000 cm 2 /g.
8. The method according to one of the preceding claims, wherein the waste glass is derived from a glass container, flat glass, solar photovoltaic panel glass, TFT-LCD liquid crystal substrate glass, or any combination thereof.
9. A pozzolanic material prepared by the method according to any one of claims 1 to 8.
10. The pozzolanic material according to claim 9, further comprising coal fly ash, silica ash, or any combination thereof.
11. A product, comprising a body having a predetermined shape; and the pozzolanic material according to claims 9 or 10.
12. The product according to claim 11, wherein the predetermined shape comprises a circular shape, a square shape, a conical shape, an arched shape, a spherical shape, a cylindrical shape or any shape designed as required.
13. The product according to claim 11 or 12, comprising a building, a decoration, a container or a mold.
14. The product according to any one of claims 11 to 13, further comprising cement.
15. The product according to any one of claims 11 to 14, further comprising concrete or cement mortar.

Description

BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a pozzolanic material, a preparation method thereof and a product thereof, and in particular, to a pozzolanic material including activated waste glass, a preparation method thereof and a product thereof. DESCRIPTION OF THE PRIOR ART Taiwan's buildings mainly use the building materials such as rebar and concrete, which are energy-intensive and have considerable carbon emissions. Concrete is the most used material, consuming more than 10 million tons of cement each year, and the production of one ton of cement clinker will generate approximately 0.9 to 1.0 tons of carbon dioxide emissions. Therefore, in order to reduce carbon emissions and achieve the Net Zero goal, it is necessary to consider reducing the use of concrete or improving the amount of cement used in the concrete formula. However, how to effectively reduce the amount of cement while maintaining the quality of safety, workability and durability is an important issue in the current construction industry. In the prior art, it has been found that pozzolanic material can be used to replace part of cement clinker to achieve the purpose of reducing the amount of cement in concrete. "Pozzolanic material" refers to a substance that has only a little or no cementation properties, but can react with calcium hydroxide (Ca(OH)2) in cement hydration products to form a product with cementation properties under sufficient humidity conditions. Such a reaction is called the "pozzolanic reaction", which is also known as the "secondary hydration cementation reaction". Common pozzolanic material includes coal fly ash and silica ash, etc., and their chemical compositions and physical properties vary greatly. Fly ash from coal-fired power plants is mainly composed of silicon dioxide (SiO2) and aluminum oxide (Al2O3). Silica ash, also known as fine silicon dioxide, is a by-product of the iron-silicon alloy smelting process. Its main component is amorphous silicon dioxide. Among them, the pozzolanic activity index of silica ash is higher, while the pozzolanic activity of coal fly ash is relatively low. In recent years, because glass is non-biodegradable, it cannot be decomposed by landfill or composting, and is non-flammable, resource recycling has become its best treatment method. Further, because the main component of waste glass on the market is amorphous silicon dioxide, it can undergo pozzolanic reaction with cement when added to cement and has begun to be used in the construction industry. Waste glass mainly is derived from glass containers, flat glass and TFT-LCD liquid crystal substrate glass. In addition, as the demand for solar photovoltaics increases, the amount of waste glass from solar photovoltaic panels to be processed will also increase accordingly in the future. At present, waste glass can be used as engineering aggregate after screening, crushing, and impurity removal. It is mostly used in recycled products such as asphalt pavements, bricks, and cement products. However, most of these applications are downcycling uses of material recycling, and fail to fully exploit the high silicon content and vitreous content of waste glass. Previous related technologies, such as Patent Nos. CN103553491A and CN103172323A, only disclosed a method for preparing concrete using waste glass, but did not explore the activity of the waste glass. In addition, although Patent Nos. TWI761284 and TWI796036 propose activating glass powder with an alkali activator to form a new inorganic binder or inorganic solidifier without cement clinker, the use of the alkali activator will increase production costs, its commercial application has yet to be verified, and thus its market acceptanceremians low. Therefore, in order to address the problems of insufficient activity, low recycling rate and inadequate concrete performance of waste glass when used as pozzolanic material in the prior art, it is urgent to develop methods that enhance the pozzolanic bonding activity of waste glass. Such methods can increase its recycling rate and create high added value, which represents an important goal of current technological development. SUMMARY OF THE INVENTION Based on the above reasons, the present invention provides a method for preparing a pozzolanic material using waste glass, and in particular, a technology for activating the waste glass and reproducing it into a pozzolanic material. In one aspect of the present invention, a method for preparing a pozzolanic material includes the following steps: collecting waste glass; crushing the waste glass into waste glass particles having a predetermined size; and grinding the waste glass particles to obtain finely ground glass powder having a predetermined particle size and a predetermined particle size distribution for serving as the pozzolanic material. Preferably, the predetermined size of the waste glass particles may be less than about 10 mm. Preferably, the predet