CN106747168B - A kind of steam-pressing aero-concrete of low water absorption and preparation method thereof - Google Patents

A kind of steam-pressing aero-concrete of low water absorption and preparation method thereof Download PDF

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Publication number
CN106747168B
CN106747168B CN201611114297.XA CN201611114297A CN106747168B CN 106747168 B CN106747168 B CN 106747168B CN 201611114297 A CN201611114297 A CN 201611114297A CN 106747168 B CN106747168 B CN 106747168B
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steam
concrete
pressing aero
parts
water absorption
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CN106747168A (en
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李书进
钱红萍
厉见芬
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Jiangsu Haiding energy science and Technology Development Co Ltd
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Changzhou Institute of Technology
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/10—Lime cements or magnesium oxide cements
    • C04B28/12—Hydraulic lime
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40—Porous or lightweight materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Porous Artificial Stone Or Porous Ceramic Products (AREA)

Abstract

The invention belongs to building material technical fields, more particularly to a kind of steam-pressing aero-concrete of low water absorption, including 50 ~ 100 parts of levigate quartz sand, 8~20 parts of cement, 10 ~ 20 parts of quick lime, 0.8 ~ 1.5 part and 0.4 ~ 1.0 part of hydrophober of aluminium cream.The invention also discloses a kind of preparation methods of the steam-pressing aero-concrete of low water absorption.Efficient hydrophobic agent is added in the steam-pressing aero-concrete formula of low water absorption provided by the invention, under the premise of low amounts addition, the water absorption rate for greatly reducing steam-pressing aero-concrete, improves the compression strength of steam pressurized foam concrete, while also reducing thermal coefficient.

Description

A kind of steam-pressing aero-concrete of low water absorption and preparation method thereof
Technical field
The invention belongs to building material technical fields, a kind of steam-pressing aero-concrete more particularly to low water absorption and Preparation method.
Background technique
Steam-pressing aero-concrete (AAC:Autoclaved Aerated Concrete) is with siliceous material (cement and stone Sand) and calcareous material (lime, gypsum) be primary raw material, using foaming agent in slurry with the chemical reaction of its component and produce Angry body, by mixing, casting, it is quiet stop, sell cut, high-pressure curing, go out that the processing routes such as kettle are formed there is light porous structure Silicates product.
However, the porosity due to AAC is up to 75%~85%, although most of hole is " ink bottle " structure, still There is higher water absorption rates, this has seriously affected its heat insulating effect.In addition, the mechanical property of AAC and its moisture content are close Cut phase is closed.A large number of experiments show that: the compression strength highest of AAC when over dry, as saturation state changes, compression strength starts to become Change, when moisture content is more than 15%, intensity with moisture content increase and downward trend slows down, when moisture content is more than 25% or more, Intensity tends towards stability.Therefore, the water absorption rate for controlling AAC is particularly important.
Summary of the invention
The first object of the present invention is: overcoming the technology that existing steam-pressing aero-concrete moisture content is excessively high in the prior art Problem provides a kind of steam-pressing aero-concrete of low water absorption.
The technical solution adopted by the present invention to solve the technical problems is: a kind of steam-pressing aero-concrete of low water absorption, In terms of mass parts, including 50~100 parts of levigate quartz sand, 8~20 parts of cement, 10~20 parts of quick lime, 0.8~1.5 part of aluminium cream With 0.4~1.0 part of hydrophober.
Preferably, in terms of mass parts, the steam-pressing aero-concrete of the low water absorption include 60~90 parts of levigate quartz sand, 10~20 parts of cement, 10~20 parts of quick lime, 0.8~1.2 part of aluminium cream and 0.4~1.0 part of hydrophober.
Preferably, in terms of mass parts, the steam-pressing aero-concrete of the low water absorption include 70~80 parts of levigate quartz sand, 10~20 parts of cement, 10~20 parts of quick lime, 0.8~1.2 part of aluminium cream and 0.4~1.0 part of hydrophober.
Preferably, the hydrophober includes hydrophobicity siloxanes.Hydrophobicity siloxanes will be soluble in by spray drying The protecting colloid and anti-caking agent of water wrap up silane and manufactured, are a kind of hydrophobicity additions with superperformance Agent.When hydrophobicity siloxanes is added in slurry, protecting colloid shell soluble easily in water dissolves in slurry solution rapidly, and The hydrophobicity siloxanes wherein wrapped up is discharged into slurry.Hydrophilic functional groups in hydrophobicity siloxanes are easy hydrolysis and generate silicon Triacontanol group, activity it is very high, continue to chemically react with the hydroxyl group in hydrated product, be forced through crosslinked action from And the silane to link together is adsorbed on hole wall surface inside AAC.In a preference of the invention, ELOTEX product have been selected The SEAL80 product of board.
Preferably, the hydrophober is the mixture of hydrophobicity siloxanes, hard fatty acids calcium and potassium methyl silicate；It is described to hate The mass ratio of aqueous siloxanes, hard fatty acids calcium and potassium methyl silicate is 2~6:1:1.
Preferably, dioxide-containing silica >=80% in the levigate quartz sand, clay content≤3%, average grain diameter be 80~ 120um。
Preferably, 6~7min of the quick lime digestion time, 75 DEG C of digestion condition, effective CaO content >=75%, 80 μm Square hole screen tails over 12.0%.
Preferably, the cement selection strength grade is the ordinary portland cement of 42.5MPa.
Preferably, active aluminium content >=65%, 0.75mm sieve tails over≤2.5%, and 30min rate of gas generation in the aluminium cream >=99%.
The second object of the present invention is: asking for the excessively high technology of sand aerated concrete block moisture content in the prior art Topic, provides a kind of steam-pressing aero-concrete preparation method of low-water-content.
The technical solution adopted by the present invention to solve the technical problems is: a kind of steam-pressing aero-concrete of low water absorption Preparation method includes the following steps:
(1) 50~100 parts of levigate quartz sand, 8~20 parts of cement, 10~20 parts of quick lime and hydrophober 0.4~1.0 are weighed Part, 1~2min is stirred, until mixture stirs evenly；
(2) add water to continue 1~5min of stirring in the mixture obtained in step (1), form uniform sizing material, the slurry Middle water-solid ratio is 0.65~0.75；
(3) metering part aluminium cream is added in the slurry that step (2) obtains, 1~2min of stirring obtains finished product slurry；
(4) the finished product slurry that step (3) obtains is cast in mold, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h, Foaming forms the steam-pressing aero-concrete semi-finished product of volume stability；
(5) the steam-pressing aero-concrete semi-finished product that step (4) obtains are entered into kettle steam-cured, steam-cured 6~16h of period, first from normal Temperature starts logical steam heating, and still kettle curing temperature is 160~200 DEG C, 0.9~1.2MPa of constant temperature and pressure；After the completion of steam-cured To the steam-pressing aero-concrete of low water absorption.
Preferably, water-solid ratio is 0.68~0.75 in the slurry；Further, in the slurry water-solid ratio be 0.70~ 0.75。
The invention has the advantages that being added to height in the steam-pressing aero-concrete formula of low water absorption provided by the invention Hydrophober is imitated, under the premise of low amounts addition, greatly reduces the water absorption rate of steam-pressing aero-concrete, is improved steam pressurized mixed The compression strength of solidifying soil product, while also reducing thermal coefficient.
Specific embodiment
Embodiment 1
A kind of preparation method of the steam-pressing aero-concrete of low water absorption, includes the following steps:
(1) 75 parts of levigate quartz sand, 10 parts of cement, 15 parts of quick lime and 0.8 part of hydrophobic siloxanes are weighed, stirring 1~ 2min, until mixture stirs evenly；
(2) add water to continue 1~5min of stirring in the mixture obtained in step (1), form uniform sizing material, the slurry Middle water-solid ratio is 0.65；
(3) 1.2 parts of aluminium cream are added in the slurry that step (2) obtains, 1~2min of stirring obtains finished product slurry；
(4) the finished product slurry that step (3) obtains is cast in mold, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h, Foaming forms the steam-pressing aero-concrete semi-finished product of volume stability；
(5) the steam-pressing aero-concrete semi-finished product that step (4) obtains are entered kettle steam-cured, steam-cured period 6h, is first opened from room temperature Begin to lead to steam heating, still kettle curing temperature is 160 DEG C, constant temperature and pressure 1.0MPa；The steaming of low water absorption is obtained after the completion of steam-cured Pressing aero-concrete.
Embodiment 2
A kind of preparation method of the steam-pressing aero-concrete of low water absorption, includes the following steps:
(1) 80 parts of levigate quartz sand, 8 parts of cement, 12 parts of quick lime, 0.4 part of hydrophobic siloxanes, hard fatty acids calcium are weighed 0.2 part and 0.2 part of potassium methyl silicate, 1~2min is stirred, until mixture stirs evenly；
(2) add water to continue 1~5min of stirring in the mixture obtained in step (1), form uniform sizing material, the slurry Middle water-solid ratio is 0.68；
(3) 1.2 parts of aluminium cream are added in the slurry that step (2) obtains, 1~2min of stirring obtains finished product slurry；
(4) the finished product slurry that step (3) obtains is cast in mold, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h, Foaming forms the steam-pressing aero-concrete semi-finished product of volume stability；
(5) the steam-pressing aero-concrete semi-finished product that step (4) obtains are entered kettle steam-cured, steam-cured period 6h, is first opened from room temperature Begin to lead to steam heating, still kettle curing temperature is 160 DEG C, constant temperature and pressure 1.0MPa；The steaming of low water absorption is obtained after the completion of steam-cured Pressing aero-concrete.
Embodiment 3
A kind of preparation method of the steam-pressing aero-concrete of low water absorption, includes the following steps:
(1) 80 parts of levigate quartz sand, 8 parts of cement, 12 parts of quick lime, 0.6 part of hydrophobic siloxanes, hard fatty acids calcium are weighed 0.1 part and 0.1 part of potassium methyl silicate, 1~2min is stirred, until mixture stirs evenly；
(2) add water to continue 1~5min of stirring in the mixture obtained in step (1), form uniform sizing material, the slurry Middle water-solid ratio is 0.68；
(3) 1.2 parts of aluminium cream are added in the slurry that step (2) obtains, 1~2min of stirring obtains finished product slurry；
(4) the finished product slurry that step (3) obtains is cast in mold, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h, Foaming forms the steam-pressing aero-concrete semi-finished product of volume stability；
(5) the steam-pressing aero-concrete semi-finished product that step (4) obtains are entered kettle steam-cured, steam-cured period 6h, is first opened from room temperature Begin to lead to steam heating, still kettle curing temperature is 160 DEG C, constant temperature and pressure 1.0MPa；The steaming of low water absorption is obtained after the completion of steam-cured Pressing aero-concrete.
Comparative example 1
A kind of preparation method of steam-pressing aero-concrete, includes the following steps:
(1) 75 parts of levigate quartz sand, 10 parts of cement and 15 parts of quick lime are weighed, 1~2min is stirred, until mixture stirs Uniformly；
(2) add water to continue 1~5min of stirring in the mixture obtained in step (1), form uniform sizing material, the slurry Middle water-solid ratio is 0.65；
(3) 1.2 parts of aluminium cream are added in the slurry that step (2) obtains, 1~2min of stirring obtains finished product slurry；
(4) the finished product slurry that step (3) obtains is cast in mold, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h, Foaming forms the steam-pressing aero-concrete semi-finished product of volume stability；
(5) the steam-pressing aero-concrete semi-finished product that step (4) obtains are entered kettle steam-cured, steam-cured period 6h, is first opened from room temperature Begin to lead to steam heating, still kettle curing temperature is 160 DEG C, constant temperature and pressure 1.0MPa；The steaming of low water absorption is obtained after the completion of steam-cured Pressing aero-concrete.
Test example 1
Intensity test: selecting 100mm × 100mm × 100mm cuboid sample, and every group takes 3 samples to carry out in parallel Test, average value is the unconfined compressive strength of the sample, and sample should be at absolute dry condition.
Determination of conductive coefficients: carrying out referring to JGJ 51 " lightweight aggregate concrete technology regulation ", with 3 pieces of test specimens for 1 group, 3 pieces Test specimen is respectively as follows: 1 piece of thin test specimen (200mm × 200mm × 20mm), thick 2 pieces of test specimen (200mm × 200mm × 60mm).
Dry density test: choosing 100mm × 100mm × 100mm cuboid sample, and every group takes 3 samples to carry out in parallel Test, takes its average value.
Water absorption rate test: it refers to GB/T 11969 " steam-pressing aero-concrete method for testing performance ".AAC test specimen is taken out, is dried It is dry, survey its quality m0；It is immersed in the water and is dipped to the testing time, survey its quality m1, water absorption rate is (m1-m0)/m0。
Inspection project Embodiment 1 Embodiment 2 Embodiment 3 Comparative example 1
Intensity (MPa) 3.55 3.84 3.80 3.11
Thermal coefficient (W/m.K) 0.141 0.131 0.128 0.149
Water absorption rate (48h) 2.45% 2.05% 2.09% 68.5%
As can be seen from the above table, after addition hydrophobic siloxanes is as hydrophober, the strength grade of steam-pressing aero-concrete About 15% is improved relative to comparative example, the thermal coefficient of steam-pressing aero-concrete has dropped about 5%, and comprehensive performance, which has, obviously to be mentioned It rises.On this basis, select hydrophobic siloxanes, hard fatty acids calcium and potassium methyl silicate as mixing hydrophober, it is steam pressurized mixed The strength grade of soil is coagulated relative to selecting single hydrophober to be further improved, and thermal coefficient is also further reduced.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, those skilled in the art Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' completely.The skill of this invention Art range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.

Claims (5)

1. a kind of steam-pressing aero-concrete of low water absorption, it is characterised in that in terms of mass parts, by 70~80 parts of levigate quartz sand, 10~20 parts of cement, 10~20 parts of quick lime, 0.8~1.2 part of aluminium cream and 0.4~1.0 part of hydrophober composition；The hydrophober is The mixture of hydrophobicity siloxanes, calcium stearate and potassium methyl silicate, the hydrophobicity siloxanes, calcium stearate and methane-siliconic acid The mass ratio of potassium is 2~6:1:1.
2. the steam-pressing aero-concrete of low water absorption as described in claim 1, it is characterised in that two in the levigate quartz sand Silica content >=80%, clay content≤3%, average grain diameter are 80~120 μm.
3. the steam-pressing aero-concrete of low water absorption as described in claim 1, it is characterised in that activated aluminum contains in the aluminium cream Amount >=65%, 0.75mm sieve tails over≤2.5%, and 30min rate of gas generation >=99%.
4. the steam-pressing aero-concrete of low water absorption as described in claim 1, it is characterised in that described cement selection intensity etc. Grade is the ordinary portland cement of 42.5MPa.
5. a kind of preparation method of such as steam-pressing aero-concrete of the described in any item low water absorptions of Claims 1 to 4, feature It is to include the following steps:
1) 70~80 parts of levigate quartz sand, 10~20 parts of cement, 10~20 parts of quick lime and 0.4~1.0 part of hydrophober are weighed, is stirred 1~2min is mixed, until mixture stirs evenly；
(2) add water to continue 1~5min of stirring in the mixture obtained in step (1), form uniform sizing material, water in the slurry Gu than being 0.65~0.75；
(3) metering part aluminium cream is added in the slurry that step (2) obtains, 1~2min of stirring obtains finished product slurry；
(4) the finished product slurry that step (3) obtains is cast in mold, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h, foaming Form the steam-pressing aero-concrete semi-finished product of volume stability；
(5) the steam-pressing aero-concrete semi-finished product that step (4) obtains are entered kettle steam-cured, steam-cured 6~16h of period, is first opened from room temperature Begin to lead to steam heating, still kettle curing temperature is 160~200 DEG C, 0.9~1.2MPa of constant temperature and pressure；It is obtained after the completion of steam-cured low The steam-pressing aero-concrete of water absorption rate.
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CN110885224A (en) * 2019-11-28 2020-03-17 温州明远新型建材有限公司 Aerated concrete anti-freezing building block and production process thereof
CN115286420A (en) * 2022-08-16 2022-11-04 北京金隅加气混凝土有限责任公司 Autoclaved aerated concrete with hydrophobicity and preparation method thereof

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CN103588458A (en) * 2013-11-26 2014-02-19 天津天筑建材有限公司 Low-density waterproof impervious autoclaved aerated concrete heat-insulation plate

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CN101244924A (en) * 2007-12-27 2008-08-20 北京恒业村科技有限公司 Heat preserving sheet of coal ash

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Publication number Priority date Publication date Assignee Title
CN103588458A (en) * 2013-11-26 2014-02-19 天津天筑建材有限公司 Low-density waterproof impervious autoclaved aerated concrete heat-insulation plate

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Effective date of registration: 20191211

Address after: 213300 No.19, new material industry concentration zone, Nandu Town, Liyang City, Changzhou City, Jiangsu Province

Patentee after: Jiangsu Haiding energy science and Technology Development Co Ltd

Address before: 213031 Changzhou Institute of Technology, No. 666 Liaohe Road, Jiangsu, Changzhou

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