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Molded article using hydraulic lime and method for producing same

A technology of hydraulic lime and a manufacturing method, which is applied in manufacturing tools, ceramic molding machines, cement production, etc., can solve the problems of difficult rusting of steel bars and poor compressive strength, etc.

Pending Publication Date: 2019-11-15
KUSUNOKI SEKKAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since hydraulic lime is insoluble in water after solidification, when it is used in composite building materials containing steel bars, it has an excellent feature that steel bars are not easily rusted, but because, for example, this hydraulic lime has very poor compressive strength compared with concrete , so it is not currently used as a building structural component

Method used

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  • Molded article using hydraulic lime and method for producing same
  • Molded article using hydraulic lime and method for producing same
  • Molded article using hydraulic lime and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] 1. Fabrication of Test Body

[0099] 1.1. Materials

[0100] (natural hydraulic lime)

[0101] The hydraulic lime used in the preparation of the test body was NHL2 from the A producing area (Eastern France), and these chemical components are shown in Table 1.

[0102] (aggregate)

[0103] In the preparation of the test body, No. 5 silica sand (Mikawa silica sand), No. 6 silica sand (Mikawa silica sand), and No. 8 silica sand (Mikawa silica sand) with different particle size distributions were used as aggregates, and the maximum diameter was 250 μm or less, and the peak value of the particle size distribution was Calcium carbonate (hitachi gravel) of 40-100 μm.

[0104] 1.2. Compounding amount of each component of the test body

[0105] Table 2 shows the parameters of the manufactured test bodies.

[0106] (moisture content)

[0107] According to the provisions of European Standard EN459-2, when 55 mass% of water was added to the hydraulic lime and press-molded, no...

Embodiment 2

[0141] 1. Fabrication of Test Body

[0142] Using the materials used in Example 1, adjust the water content appropriately to manufacture a test body of the same size as Example 1. In order to make up for the influence of the molding pressure, the solidification concentration of carbon dioxide gas, and the presence or absence of aggregate mixed with hydraulic lime, Perform the bending test again. Table 3 shows parameters of the manufactured test bodies.

[0143] Compared to the 10-40N / mm given in Example 1 2The molding pressure, lower limit is 5N / mm in embodiment 2 2 , the upper limit is 60N / mm 2 , to study the effect of molding pressure.

[0144] As the curing conditions, it was also implemented at a carbonic acid concentration of 1%. However, for a concentration of 1%, it is only carried out when the curing period is 2 days. Regarding the curing period, in Example 1, since no significant increase was seen over 14 days, the maximum number of days during the curing period...

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Abstract

The invention provides a molded article that uses hydraulic lime and a method for producing same. A molded article having a flexural strength of at least 7.5 N / mm2 and containing hydraulic lime subjected to calcium carbonate crystallization. A method for producing a molded article containing hydraulic lime, the method comprising (a) a step for press molding a mixture containing hydraulic lime andwater at a pressure of at least 5 N / mm2 and (b) a step for submitting the press-molded article yielded by (a) to a carbon dioxide cure.

Description

technical field [0001] The present invention relates to a molded body using hydraulic lime and its manufacturing method. Background technique [0002] There is a material such as hydraulic lime as a building material, and it has been known since ancient Roman times (2nd century BC) that it dissolves in water and solidifies when left to dry. Hydraulic lime includes natural hydraulic lime and artificial hydraulic lime. Natural hydraulic lime is obtained by burning siliceous natural limestone, adding water and digesting it. Artificial hydraulic lime is mixed with slaked lime. Obtained from volcanic ash (ポラゾン) substances or materials that express hydraulic properties. Since hydraulic lime is insoluble in water after solidification, when used in composite building materials containing steel bars, it has an excellent feature that steel bars are resistant to rust, but because, for example, this hydraulic lime has very poor compressive strength compared with concrete , so it is no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B3/02B28B11/24C04B28/12C04B40/02
CPCB28B11/24C04B28/12C04B28/10B28B3/00Y02P40/18C04B14/06C04B14/28C04B40/0071C04B40/0231B28B3/02C04B7/34C04B2201/50
Inventor 池田胜利
Owner KUSUNOKI SEKKAI CO LTD
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