阅读说明：本技术 一种环保加气砖及其制备方法 (Environment-friendly aerated brick and preparation method thereof ) 是由 明洪刚 明同彬 严伟 于 2019-11-20 设计创作，主要内容包括：本方案公开了建筑材料技术领域中的一种环保加气砖,包括以下质量份数的组分：粉煤灰35-40份、石英砂40-50份、水60-70份、水泥15-20份、石膏5-6份、碳化钙0.06-0.08份、钢纤维1-3份。本方案还公开了上述加气砖的制备方法。本方案中采用原料成本低,制成的加气砖强度好、导热系数低、抗裂效果非常好、节能环保,满足建筑工程的需要,符合环保的需求。(The scheme discloses an environment-friendly aerated brick in the technical field of building materials, which comprises the following components in parts by mass: 35-40 parts of fly ash, 40-50 parts of quartz sand, 60-70 parts of water, 15-20 parts of cement, 5-6 parts of gypsum, 0.06-0.08 part of calcium carbide and 1-3 parts of steel fiber. The scheme also discloses a preparation method of the aerated brick. The scheme is low in cost of raw materials, and the prepared aerated brick is good in strength, low in heat conductivity coefficient, very good in anti-cracking effect, energy-saving and environment-friendly, meets the requirements of building engineering, and meets the requirements of environmental protection.)

1. An environmental protection aerated brick which is characterized in that: the paint comprises the following components in parts by mass: 35-40 parts of fly ash, 40-50 parts of quartz sand, 60-70 parts of water, 15-20 parts of cement, 5-6 parts of gypsum, 0.06-0.08 part of calcium carbide and 1-3 parts of steel fiber.

2. The environment-friendly aerated brick according to claim 1, characterized in that: the paint comprises the following components in parts by mass: 35-40 parts of fly ash, 40-45 parts of quartz sand, 65-70 parts of water, 18-20 parts of cement, 5-6 parts of gypsum, 0.06-0.08 part of calcium carbide and 1-3 parts of steel fiber.

3. The environment-friendly aerated brick according to claim 1, characterized in that: the paint comprises the following components in parts by mass: 35-40 parts of fly ash, 45-50 parts of quartz sand, 60-65 parts of water, 15-18 parts of cement, 5-6 parts of gypsum, 0.06-0.08 part of calcium carbide and 1-3 parts of steel fiber.

4. The environment-friendly aerated brick according to any one of claims 1 to 3, wherein: the gypsum is phosphogypsum.

5. The environment-friendly aerated brick according to any one of claim 4, wherein: the steel fiber is milling type steel fiber.

6. The preparation method of the environment-friendly aerated brick according to claim 5, characterized by comprising the following steps: the method comprises the following steps:

firstly, preparing fly ash, quartz sand, water, cement, phosphogypsum, calcium carbide and steel fiber according to the proportion;

mechanically crushing the fly ash and the quartz sand into powder, and mechanically crushing calcium carbide into particles with the diameter of 0.5-0.71 mm;

step three, heating the semi-dry oil to 200-;

step four, adding the fly ash, the quartz sand, the cement, the phosphogypsum and the steel fiber into water, uniformly stirring, and finally adding the calcium carbide particles and fully mixing to obtain slurry;

step five, injecting the stirred slurry into a mold, then placing the mold into a static curing chamber, sealing and preserving heat at the temperature of 90-110 ℃, keeping the static curing time for 3-4 hours, and then cutting to obtain a green brick;

sixthly, putting the green bricks into a high-pressure autoclave for autoclave curing;

and seventhly, after the steam curing is finished, removing the pressure of the green bricks in the still kettle, cooling and discharging the green bricks out of the still kettle to obtain the aerated bricks.

7. The preparation method of the environment-friendly aerated brick according to claim 6, which is characterized by comprising the following steps: the semi-dry oil is soybean oil.

8. The preparation method of the environment-friendly aerated brick according to claim 7, characterized by comprising the following steps: the chemical auxiliary agent is cyclopentadiene.

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to an environment-friendly aerated brick and a preparation method thereof.

Background

The aerated brick is a concrete block made of calcium-containing materials such as cement and lime, doped with silicon-containing materials such as river sand and volcanic ash, added with aluminum powder, and subjected to stirring, pouring, static curing, cutting, high-pressure steam curing and the like. The brick has the characteristics of small apparent density (generally 1/3 of clay bricks, when the brick is used as a wall material, the building self weight is reduced by 2/5-1/2), heat preservation and insulation, fire resistance, good processability and the like.

The aerated brick generally takes aluminum powder as an aerating agent. The aluminum powder air-entraining agent has the advantages of large gas forming amount, long gas forming duration and the like, and is well mature in production technology. However, in recent years, due to the development of a large amount of aluminum materials, the supply of aluminum materials is becoming more and more intense, and the price of aluminum powder is rising, which increases the production cost.

Disclosure of Invention

The invention aims to provide an environment-friendly aerated brick and a preparation method thereof, so as to reduce the production cost of the aerated brick.

In order to achieve the aim, the invention provides the following scheme that the environment-friendly aerated brick comprises the following components in parts by mass: 35-40 parts of fly ash, 40-50 parts of quartz sand, 60-70 parts of water, 15-20 parts of cement, 5-6 parts of gypsum, 0.06-0.08 part of calcium carbide and 1-3 parts of steel fiber.

Preferably, the composition comprises the following components in parts by mass: 35-40 parts of fly ash, 40-45 parts of quartz sand, 65-70 parts of water, 18-20 parts of cement, 5-6 parts of gypsum, 0.06-0.08 part of calcium carbide and 1-3 parts of steel fiber.

Preferably, the composition comprises the following components in parts by mass: 35-40 parts of fly ash, 45-50 parts of quartz sand, 60-65 parts of water, 15-18 parts of cement, 5-6 parts of gypsum, 0.06-0.08 part of calcium carbide and 1-3 parts of steel fiber.

Preferably, the gypsum is phosphogypsum.

Preferably, the steel fiber is milled steel fiber.

The beneficial effect of this scheme does: in the scheme, calcium carbide is used as a gas former, and compared with the aluminum powder adopted in the prior art, the aluminum powder needs to generate hydration reaction in an alkaline environment to generate hydrogen, so that an air cavity is generated in an air-added brick blank to obtain the hollow air-added brick. Therefore, lime is generally added to the raw materials to make the aerated brick raw slurry alkaline, and after the lime is added, the lime is hardened by drying, crystallization and carbonization, and the hardening is slow because the carbon dioxide content in the air is low, and the calcium carbonate hard shell formed after carbonization prevents the penetration of carbon dioxide into the interior and also prevents the evaporation of water from the exterior, and the strength after hardening is not high, and the compressive strength of the 1:3 lime mortar 28d is only 0.2-0.5 MPa. When the lime is in a humid environment, the water in the lime does not evaporate, the carbon dioxide cannot permeate, the hardening stops, and the hardened lime is dissolved and dispersed when meeting water due to the fact that the calcium hydroxide is slightly soluble in water. Therefore, lime is not suitable for use in long-term wet and water-soaked environments. During the hardening process of lime, a large amount of water is evaporated, the volume is obviously shrunk, and drying shrinkage cracks are easy to occur. In the scheme, calcium carbide is used as a gas former, reacts with water to generate acetylene gas, can achieve the same effect of aluminum powder, has small difference in gas output, can react without being in an alkaline environment, reduces the use of lime, and avoids the problems that aerated bricks are hardened slowly and are easy to crack due to drying shrinkage while the cost is reduced. The scheme is low in cost of raw materials, and the prepared aerated brick is good in strength, low in heat conductivity coefficient, very good in anti-cracking effect, energy-saving and environment-friendly, meets the requirements of building engineering, and meets the requirements of environmental protection.

In order to achieve the purpose, the invention also provides the following scheme, and the preparation method of the environment-friendly aerated brick comprises the following steps:

firstly, preparing fly ash, quartz sand, water, cement, phosphogypsum, calcium carbide and steel fiber according to the proportion;

mechanically crushing the fly ash and the quartz sand into powder, and mechanically crushing calcium carbide into particles with the diameter of 0.5-0.71 mm;

step three, heating the semi-dry oil to 200-;

step four, adding the fly ash, the quartz sand, the cement, the phosphogypsum and the steel fiber into water, uniformly stirring, and finally adding the calcium carbide particles and fully mixing to obtain slurry;

step five, injecting the stirred slurry into a mold, then placing the mold into a static curing chamber, sealing and preserving heat at the temperature of 90-110 ℃, keeping the static curing time for 3-4 hours, and then cutting to obtain a green brick;

sixthly, putting the green bricks into a high-pressure autoclave for autoclave curing;

and seventhly, after the steam curing is finished, removing the pressure of the green bricks in the still kettle, cooling and discharging the green bricks out of the still kettle to obtain the aerated bricks.

Preferably, the semi-drying oil is soybean oil.

Preferably, the chemical auxiliary agent is cyclopentadiene.

The beneficial effect of this scheme does: the calcium carbide is crushed into particles with the size of 0.5-0.71mm, and then the particles are immersed in the semi-dry oil, so that a layer of oil film is formed on the surfaces of the calcium carbide particles, the reaction of the calcium carbide and water is avoided when the calcium carbide is added and mixed, when the slurry is statically maintained and foamed, the oil film is melted at 90-110 ℃ to expose the calcium carbide, the calcium carbide and the water in the slurry react to produce acetylene gas, so that uniform air holes are formed in the blank body of the aerated brick, and the aerated brick is obtained after steam maintenance.

Detailed Description

The following is further detailed by way of specific embodiments: