JP-7857366-B2 - Carbonate hardened material, granulated aggregate made from carbonate hardened material, and concrete composition using the same

Inventors

• 上田 陽一
• 横光 優
• 野田 謙二
• 丸屋 英二
• 玉滝 浩司
• 藤野 由隆
• 伊藤 隆紘

Assignees

• ＵＢＥ三菱セメント株式会社

Dates

Publication Date

20260512

Application Date

20240919

Claims (8)

1. A carbonate hardened product containing carbonates and formed by granulation, The coarseness ratio is 3.0 or higher. A carbonate cured product having a dry mass of 100 parts by mass, containing 10 to 60 parts by mass of CaCO3 and 5 to 20 parts by mass of SiO2 .
2. A carbonate hardened product containing carbonates and formed by granulation, The coarseness ratio is 3.0 or higher. CO2 as a percentage of the dry mass of the carbonate cured product 2 A carbonate-cured product with a fixed amount of 50 kg/t or more and less than 300 kg/t.
3. The carbonate cured product according to claim 1 , wherein the amount of CO2 fixed relative to the dry mass of the carbonate cured product is 50 kg/t or more and less than 300 kg/t.
4. The carbonate cured product according to claim 1 or 2 , wherein the water content is more than 21 parts by mass per 100 parts by mass of the dry mass of the carbonate cured product.
5. A carbonate cured product according to claim 1 or 2, wherein the maximum particle size is 10 mm or less.
6. A granulated aggregate comprising the carbonate hardened product described in claim 1 or 2.
7. cement and Fine aggregate containing the granulated aggregate described in claim 6, Coarse aggregate and Water and, A concrete composition containing [the specified ingredient].
8. A cured product of the concrete composition according to claim 7.

Description

This disclosure relates to carbonate cured products, granulated aggregates comprising carbonate cured products, and concrete compositions containing said granulated aggregates. Technologies for the storage and sequestration of carbon dioxide ( CO2 ) are attracting attention as we work towards realizing a carbon-neutral society. If CO2 can be fixed as carbonate and then used as a construction material such as concrete, it is expected that a large amount of CO2 can be fixed, and therefore there is a strong desire to establish a practical and versatile technology. When using carbonates as concrete materials, the appropriate mixing ratio and required properties differ depending on whether they are used as a powdered mixer or as aggregate. Since the majority of concrete components are aggregates (fine or coarse aggregates), if the carbonates can be used as aggregates, their contribution to CO2 sequestration can increase in proportion to the amount used. Furthermore, in order to promote the widespread use of such aggregates and contribute to a decarbonized society, it is desirable that they be used not only in ordinary concrete but also widely in concrete for special applications and secondary products. Patent Document 1 describes a method for producing carbonates that can be used as aggregates, characterized by granulating a water-containing, uncarbonated Ca-containing raw material in the presence of carbon dioxide, and solidifying the raw material during granulation through a carbonation reaction to obtain a carbonated solidified granule. Japanese Patent Publication No. 2006-188368 This graph shows the relationship between the coarseness ratio and the sieving retention rate of carbonate-hardened materials.This graph shows the relationship between the coarseness ratio and the sieving retention rate of carbonate-hardened material.This graph shows the relationship between the sieve opening of the carbonate cured product and the percentage of material passing through it.This graph shows the relationship between the pore size of the aggregate and the cumulative pore volume.This graph shows the relationship between the pore size of the aggregate and the log differential pore volume. The following describes embodiments of this disclosure. However, these embodiments are illustrative examples for illustrating this disclosure and are not intended to limit this disclosure to the following. In the following description, "X to Y" (where X and Y are arbitrary numbers) means "X or greater and Y or less" unless otherwise specified. Unless otherwise specified, the materials exemplified herein may be used individually or in combination of two or more. In compositions such as mixtures, the content of each component refers to the total amount of any multiple substances present in the composition, unless otherwise specified, if multiple substances corresponding to each component exist in the composition. <Carbonate cured products> The carbonate hardened product of this disclosure is a granulated carbonate hardened product containing a carbonate, preferably having a coarseness ratio of 3.0 or more. The carbonate is preferably an alkaline earth metal carbonate, preferably containing CaCO3 and/or MgCO3 , and more preferably containing at least CaCO3 . The carbonate hardened product of this disclosure can be suitably used as aggregate (preferably fine aggregate) in construction materials such as concrete. As described later, the carbonate hardened product of this disclosure is a granulated product obtained by granulating a mixture containing calcium carbonate ( CaCO3 ), blast furnace slag, and preferably calcium hydroxide and water. In this specification, the carbonate hardened product is also referred to as "carbonate aggregate" or "granulated aggregate". According to one aspect of this disclosure, a carbonate hardened product having strength useful as aggregate can be provided. According to one aspect of this disclosure, a carbonate hardened product having a good particle size distribution as aggregate can be provided. Furthermore, the carbonate hardened product of this disclosure has a large CO2 fixation amount and can contribute to carbon neutrality. In one embodiment, the carbonate cured product preferably contains CaCO3 and SiO2 . The CaCO3 content in the carbonate cured product is preferably 10 parts by mass or more, more preferably 15 parts by mass or more, or 20 parts by mass or more, based on 100 parts by mass of the dry mass of the carbonate cured product, and the upper limit may be, for example, preferably 60 parts by mass or less, more preferably 55 parts by mass or less, or 50 parts by mass or less. The SiO2 content in the carbonate cured product is preferably 5 parts by mass or more, more preferably 8 parts by mass or more, or 10 parts by mass or more, based on 100 parts by mass of the dry mass of the carbonate cured product, and the upper limit may be, for example, 20 parts by mass or less, 18 parts by mass or less, or