Aerated concrete and preparation method thereof

[0025]Example 1

[0026]This embodiment provides an aerated concrete, a preparation method thereof, comprising the steps of:

[0027](1) Weigh 100KG material: sandwater 10kg, fly ash 20kg, cement 20kg, mortar 15kg, aluminum powder or aluminum powder 0.1kg, raw lime 6kg, gypsum 0.5kg, stone powder 5kg, straw 8kg, diamond 3kg The margin is water. Among them, the rhythmic soil as the evaporated expansion regulator, which is produced by the calcination of rhodium magnesium at 1100 ° C, which can adjust the chemical expansion of the aerated concrete blank to match the steel expansion coefficient, eliminate the sheet vertical. crack. Indicators: FMGO (effective magnesium oxide)> 80%, use digestion time between 4 to 6 hours of heavy burning soil, during the stop 3H, the reaction rate is slow, the reaction speed is gradually accelerated after 3 ~ 4h, this can be Maximize the role of Lingzhi. It is mainly reacted in the steaming temperature rise stage, and the amount of blank expansion is improved. The sand material is in accordance with the first-class requirements of the JC / T 622-2009 standard, and river sand can be used. The parameters of some of the raw materials are shown in Table 1 to 10.

[0028](2) Mixed stirring: mix the raw material with an appropriate amount of water and stir well, first add a moist material, then add the dry material, and finally add the aluminum powder; when the slurry is too thick, it is necessary to add water to the water, and the water is added to ensure that the water is added to ensure that the water is added. Before the cement usage, otherwise, it is easy to cause the mixer to block; the flow of flowers, the speed of the cement is controlled in 40s, and the lower materials are too fast, and the mixture is uneven, and the group will be bored when it is serious;

[0029](3) Pouring formation: Pour the mixed raw material into the mold in the mold, and stay 1.5H, expand and solidify the form; the intra-stationary chamber temperature is 45 ° C, which will cause the following mass defects: a. Gold surface Easy to turtle, b. Effect, thickening speed, c. Pull length hardening time, d. The blank hardening is uneven, affecting the cutting appearance, and increases the amount of damage;

[0030](4) Cutting and steaming maintenance: cutting the solidified aerated concrete into small pieces using a cutting knife; after cutting into the steam, it is maintained by 1 MPa steam for 14 hours.

[0031]Among them, in order to prevent cracks, improve the blank cutting temperature (> 80 ° C); do a good job in the heat preservation of the steaper, temperature> 60 ° C; after the plate is cut, it will enter the kettle as soon as possible to avoid too long before the kettle. Steaming maintenance in the temperature rise and cooling stage of the inverting and the exemption should be slow, strictly according to the steaming curve (figure 1 ) To feed; -0.06 ~ 0.5 MPa is called a small steam stage, and the problem of evaporating crack is formed at this stage.

[0032]Table 1 Sand material physical parameters

[0033] Operating range Water content% ＜7.0 5mm screening amount% 0.0 63μm sievement amount% ≤2.0 NaOH test organic acid Maximum yellow

[0034]Table 2 sand mold chemical parameters

[0035] Operating range Quality range SiO 2 %

[0036]Table 3 Fly Ash Physical Parameters

[0037] 200μm screening amount% ≤8.0 ±1.0 63μm sievement amount% ≤25.0 ±2.5 Large particle density g / cm 3

[0038]Table 4 Chemical parameters of fly ash

[0039] Operating range Quality range Burn% ≤5 ±0.5 SiO 2 %

[0040]Table 5 mortar parameters

[0041] Operating range Quality range Density g / cm 3

[0042]Table 6 Cement physical parameters

[0043] Operating range Quality range 200μm screening amount% ＜2.0 ---- 45μm sievement ---- ±3 Bonts specific surface area cm 2 / g

[0044]Table 7 Chemical parameters

[0045] Operating range Quality range CAO% 58.0-68.0 ±0.5 F-CAO% ＜2.0 ---- MGO% ≤3.5 ±0.2 NA 2 O + K 2 O%

[0046]Table 8 Cement coagulation time

[0047] Operating range Quality range Intermediate Time min 80-180 ±15 Time-daring time min 140-260 ±20 Elemental coagulation time difference min ≥30 ---- Water volume 25.0-30.0 ±0.5

[0048]Table 9 Aluminum powder or aluminum powder parameters

[0049] Operating range Quality range Solid content (aluminum powder paste)% ＞65.0 ±1.5 Particle size D 50 Value μm

[0050]Table 10 Life physical parameters

[0051] Operating range Quality range 90μm sievement amount% ＜7.0 ±0.5 Density g / cm 3

[0052]Table 11 Floral resolution reaction parameters

[0053] Operating range Quality range 2min. 33-55℃ ±6℃ 5min. ±6℃ 10min. ±4℃ 20min. 69-73℃ ±4℃ 30min. 69-75℃ ±3℃ Tend

[0054]Table 12 Shenglime chemical parameters

[0055] Operating range Quality range CAO% ≥92.0 ±0.5 F-CAO% ≥80.0 ±1.0 MGO% ≤2.0 ±0.2 CO 2 %

[0056]Table 13 Gypsum physical parameters

[0057] Operating range Quality range 100μm sievement balance% ＜10 ±1 Average density g / cm 3

[0058]Table 14 Gypsum chemical parameters

[0059]

[0060]Table 15 stone powder parameters

[0061]

[0062]Example 2

[0063]This embodiment provides an aerated concrete, a preparation method thereof, comprising the steps of:

[0064](1) Weigh 100KG raw materials: sand material 20kg, fly ash 10kg, cement 32kg, mortar 5KG, aluminum powder or aluminum paste 2kg, raw lime 1kg, gypsum 1.4kg, stone powder 1kg, straw charcoal 15kg, diamond 0.5kg The margin is water.

[0065]Among them, the sand material is in accordance with the first-class requirements of the JC / T 622-2009 standard, and a river sand can be used.

[0066]The rhythmic soil as a vapor-pressure expansion regulator, which is a product produced by a rhodium stone at 1250 ° C, which adjusts the chemical expansion of the aerated concrete blank to match the steel expansion coefficient to eliminate the vertical crack of the sheet. Indicators: FMGO (effective magnesium oxide)> 80%, use digestion time between 4 to 6 hours of heavy burning soil, during the stop 3H, the reaction rate is slow, the reaction speed is gradually accelerated after 3 ~ 4h, this can be Maximize the role of Lingzhi. It is mainly reacted in the steaming temperature rise stage, and the amount of blank expansion is improved.

[0067](2) Mixed stirring: mix the raw material with an appropriate amount of water and stir well, first add a moist material, then add the dry material, and finally add the aluminum powder; when the slurry is too thick, it is necessary to add water to the water, and the water is added to ensure that the water is added to ensure that the water is added. Before the cement usage, otherwise, it is easy to cause the mixer to block; the gray, the speed of the cement is controlled in 60s, the lower material is too fast, the mixture is uneven, the group, the mixer is severe;

[0068](3) Pouring shape: Pour the mixed raw material into the mold in the mold, and stay 2 h, expand the gas expansion and solidify; the stationary stop room temperature is 55 ° C, which will cause the following mass defects: a. Gold surface easy Cracks, b. Effect, thickening speed, c. Pull length hardening time, d. Griffination unevenness, affect cutting appearance, and increase the amount of damage;

[0069](4) Cutting and steaming maintenance: Cut the solidified molded refueling concrete by cutting the knife is cut into small pieces; after cutting into the steam, it is maintained by 1.5 MPa steam for 10 hours.

[0070]Example 3

[0071]This embodiment provides an aerated concrete, a preparation method thereof, comprising the steps of:

[0072](1) Weigh 100KG ingredients: sandwater 10kg, fly ash 18kg, cement 24kg, mortar 12kg, aluminum powder or aluminum paste 0.5kg, raw lime 4kg, gypsum 0.5kg, stone powder 5kg, straw 8kg, diamond 2kg The margin is water.

[0073]Among them, the sand material is in accordance with the first-class requirements of JC / T 622-2009, and the quartz tail mineral sand can be used.

[0074]The rhythmic soil as a crystallurized expansion regulator, which is a product produced by rhodium magnesite at 1150 ° C, which adjusts the chemical expansion of the aerated concrete blank to match the bulk expansion coefficient to eliminate the vertical crack of the sheet. Indicators: FMGO (effective magnesium oxide)> 80%, use digestion time between 4 to 6 hours of heavy burning soil, during the stop 3H, the reaction rate is slow, the reaction speed is gradually accelerated after 3 ~ 4h, this can be Maximize the role of Lingzhi. It is mainly reacted in the steaming temperature rise stage, and the amount of blank expansion is improved.

[0075](2) Mixed stirring: mix the raw material with an appropriate amount of water and stir well, first add a moist material, then add the dry material, and finally add the aluminum powder; when the slurry is too thick, it is necessary to add water to the water, and the water is added to ensure that the water is added to ensure that the water is added. Before the cement is used, otherwise, it is easy to cause the mixer to block; the flow of flowers, the speed of the cement is controlled at 50s, and the following is too fast, the mixture is uneven, the group, and the mixer will be bored when it is serious;

[0076](3) Pouring formation: Pour the mixed raw material into the mold in the mold, and stay 1.6h, expand and solidify the form; the thermostat is 48 ° C, which will cause the following mass defects: a. Gold surface Easy to turtle, b. Effect, thickening speed, c. Pull length hardening time, d. The blank hardening is uneven, affecting the cutting appearance, and increases the amount of damage;

[0077](4) Cutting and steaming maintenance: cutting the solidified aerated concrete into small pieces by cutting knife; after cutting into the steam, it is 10.5 hours by 1.1 MPa steam.