KR950001667B1 - Process for the preparation of cement - Google Patents

Abstract

The constituents of conventional Portland cement such as calcium oxide powder, silicone dioxide, aluminum oxide, and ferric oxide were mixed with sodium oxide and magnesium oxide, the mixed powder was added to Masa or diatomite and the proper quantity of water added to obtain the pasty soft cement. The pasty cement can be hardened by the exothermic reaction of sodium oxide and magnesium oxide and have sufficient compressior strength for building materials such as brick and block.

Description

Soft Cement Using Masato and Its Manufacturing Method

The present invention relates to a soft cement and a method of manufacturing the same by using natural masato or diatomaceous earth having similar properties and mixing only with the sand contained therein, as it is, as a building material.

Masato and diatomaceous earth are weathered granite and diatomite for many years, and if they are mixed with ordinary portland cement and manufacture building materials such as bricks, they cannot obtain the required strength as building materials. It could not be mixed and used as a building material. It was crushed with water using a machine such as sand mill, and then only pure sand was selected and the rest was discarded.

Therefore, not only the large amount of mechanical equipment and manpower is required for sorting pure sand from masato or diatomaceous earth, but also the large amount from the sorting process is difficult to process and contaminates the water quality, and also throws away a lot of natural resources. There was a problem such as wasted.

The present invention solves this problem is to be used to manufacture the building materials, such as brick or block by mixing with Portland cement as it is not used to select only sand from Masato or diatomaceous earth.

If natural masato or diatomaceous earth are mixed with cement, they cannot be used as building materials because they lack strength and easily break down.

Therefore, in the present invention, calcium oxide powder (CaO), silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and iron oxide (Fe ₂ O ₃ ), which are conventional portland cement components, are sodium oxide (Na ₂ O ₃ ) and Magnesium oxide (NGO) is mixed to obtain a mixed powder, and the mixed powder is mixed with natural masato or diatomaceous earth and kneaded with an appropriate amount of water to prepare a soft cement in the form of a dough, and the soft cement reacts with water to generate heat. It is gradually hardened by the action of sodium oxide and magnesium oxide, so that it has sufficient compressive strength as a building material for bricks and blocks.

An embodiment of the present invention will be described in detail as follows.

EXAMPLE

[Step 1]

Calcium oxide powder (CaO) obtained by heating and grinding limestone, about 6670 Kg, silicon dioxide (SiO ₂ ), 2,220 Kg, aluminum oxide (Al ₂ O ₃ ) ₃₀₀ Kg, iron oxide (Fe ₂ O ₃ ) 400 Kg, sodium oxide (Na ₂ O ₃ ) 200 Kg, 210 Kg of magnesium oxide (MGO) is mixed to form a mixed powder of about 10 tons.

[Step 2]

The mixed powder obtained in the first step is evenly mixed with masato or diatomaceous earth at a volume ratio of about 1: 4, and kneaded by adding an appropriate amount of water, thereby completing a soft cement in a kneaded state.

Thus, the present invention is formed of various building materials, such as brick, road boundary stone, tile, tiles, sewer pipes, etc., if necessary, and the sodium oxide and magnesium oxide that react with water to generate heat when dried in the usual manner. By condensation hardening with each other (15-20 days of natural drying, 2-3 hours of steam drying), the compressive strength is 80Kg / ㎠, the block of KS standard compressive strength as shown in Table (1) (2) (3). It becomes 40Kg / cm <2> or more.

TABLE 1

* Test method: KSF-4004-85

* Test organization: Korea Testing Laboratory

* Name: Brick

TABLE 2

* Test Number: Min 961-1-8

* Test organization: Busan Direct Construction Construction Laboratory

* Name: Brick

TABLE 3

* Sample Number: 157-1-42

* Test organization: Gyeongsangnam-do Housing Materials Inspection Office

* Product Name: Brick, Block

In the present invention, the mixing ratio of CaO, SiO ₂ , Al ₂ O ₃ , and Fe ₂ O ₃ , which are the main components of portland cement, is based on the ratio of ordinary cement, and sodium oxide (Na ₂ O ₃ ) and magnesium oxide ( The mixing ratio of MGO) suggests the most ideal ratio, and even if mixed slightly differently, the difference in curing time and the like does not have a big difference in effect.

The mixing ratio of mixed powder and masato or diatomaceous earth is the ideal mixing ratio of normal masato and diatomaceous earth. The mixing ratio is different depending on the type and composition of masato and diatomaceous earth depending on the production area.

As described above, the present invention has the effect of preventing the exhaustion of resources and utilizing new resources by producing and using various construction materials using masato or diatomaceous earth, which exist almost indefinitely instead of depleted sand and gravel.

In addition, the present invention has a high impact resistance compared to the cement brick is a mixture of conventional cement and sand, resistant to impact and not easily cracked or broken.

This is due to the soft nature of masato or diatomaceous earth.

In addition, because the particles of masato or diatomaceous earth are fine and the density of the product is high, the permeability is low and the waterproofing, soundproofing, and thermal insulation effect is high.

In addition, it is semi-permanent, resistant to salt water and concrete to salt water because it is hardly oxidized due to high acid resistance, so it is easy to undersea construction or beach construction. Has fire resistance up to about 1,600 ℃ without going through.

Conventional cement is difficult to mix and use because the sand is not well coalesced with the mica, but Masato is easily mixed with the mica and thus can be mixed.

Claims (2)

Masato prepared by mixing ordinary Portland cement components calcium oxide, silicon dioxide, aluminum oxide and iron oxide with sodium oxide and magnesium oxide powder, mixing masato or diatomaceous earth with the appropriate amount of water and kneading Method for producing a soft cement using. Mix the usual Portland cement components calcium oxide, silicon dioxide, aluminum oxide and iron oxide with sodium oxide and magnesium oxide powder to obtain a mixed powder, mix masato or diatomaceous earth with this mixture powder and add the appropriate amount of water to make the masato. Soft cement used.