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Porous Autoclaved Sand Brick
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An autoclaved sand and raw material technology, which is applied in the field of building materials, can solve the problems of wall cracking and drying shrinkage, and achieve the effects of reducing drying shrinkage, increasing porosity, and avoiding wall cracking
Active Publication Date: 2021-11-23
中盐安徽红四方新型建材科技有限公司
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[0005] Aiming at the deficiencies of the prior art, the present invention provides a porous autoclaved sand brick, which solves the problem that the existing porous autoclaved sand brick will cause drying shrinkage after a long time, resulting in cracking of the wall
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preparation example Construction
[0038] On the other hand, the embodiment of the present invention also provides a method for preparing a porous autoclaved sand brick, characterized in that the method includes the following steps:
[0040] S2, weighing each raw material according to the percentage by weight of the raw material;
[0041] S3. Evenly measure phosphogypsum, calciumcarbideslag, wet ash, construction waste, and coarse aggregate into the feeding hopper through the belt, and then add the materials and fly ash in the feeding hopper to the mixer at the same time, mix and stir evenly, and stir The time is 3-5 minutes;
[0042] S4. Send the uniformly stirred material in step S3 into the digestion bin, store and digest for 3-5 hours, then send it into the powder mixer, and then send it into the automatic hydraulic brick machine for pressing. Cultivation and constant pressure for 4-8 hours to produce finished products, and maintenance time for 7-14 days.
[0043] In...
Embodiment 11
[0070] The original proportion and preparation conditions are the same as in Example 4, the difference is that the particle diameter of coarse aggregate particles is 2.36mm~4.75mm, accounting for 40%, the proportion of particle diameters less than 2.36mm is 35%, and the proportion of particles greater than 4.75mm 25%; its drying shrinkage value is 0.52mm / m.
Embodiment 12
[0072] The original proportion and preparation conditions are the same as in Example 4, the difference is that the particle diameter of coarse aggregate particles is 2.36mm~4.75mm, accounting for 55%, the particle diameter of less than 2.36mm accounts for 15%, and the proportion of particles larger than 4.75mm 30%; its drying shrinkage value is 0.45mm / m.
[0073] In summary, compared with the prior art, it has the following beneficial effects:
[0074] In the embodiment of the present invention, the proportion of coarse aggregate is increased in the formula of porous autoclaved sand bricks, thereby increasing the porosity inside the porous autoclaved sand bricks. When crystallization loses water, there is space to release stress inside, and it will not be transmitted to the outside. Thereby reducing the drying shrinkage value and avoiding later wall cracking.
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Abstract
The invention provides a porous autoclaved sand brick, which relates to the field of building materials. The porous autoclaved sand brick comprises the following raw materials in weight percentage: phosphogypsum 3-8%, fly ash 15-25%, carbideslag 15-25%, wet ash 5-10%, construction waste 5-15% , Coarse aggregate 40~50%. The present invention increases the proportion of coarse aggregate in the formula of porous autoclaved sand bricks, thereby increasing the porosity inside the porous autoclaved sand bricks, and when crystallization loses water, there is space to release stress inside, which will not be transmitted to the outside, thereby reducing The drying shrinkage value is ensured to avoid later wall cracking.
Description
technical field [0001] The invention relates to building materials, in particular to a porous autoclaved sand brick. Background technique [0002] Autoclaved lime-sand bricks use sand and limestone as the main raw materials, adopt compression molding, autoclave curing process, and mature production technology. It is a wall material that can realize industrialized large-scale production. Lime-sand bricks have excellent physical and mechanical properties and can meet the needs of existing construction projects. In addition, its price is also low and it has a wide range of applications. [0003] Porous autoclaved gray brick is a kind of autoclaved lime sand. The existing porous autoclaved gray brick is due to the reaction of materials in the preparation process into hydrated silicate, hydrated aluminate and other gelling minerals. It will cause drying shrinkage, cracking of the wall cavity, and endanger the safety of the building. Contents of the invention [0004] (1) Sol...
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