CN115215603A - Sand aerated building material and preparation method thereof - Google Patents

Sand aerated building material and preparation method thereof Download PDF

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Publication number
CN115215603A
CN115215603A CN202111018827.1A CN202111018827A CN115215603A CN 115215603 A CN115215603 A CN 115215603A CN 202111018827 A CN202111018827 A CN 202111018827A CN 115215603 A CN115215603 A CN 115215603A
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sand
building material
aerated building
quicklime
sand aerated
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程书顺
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Shanghai Aozhong Building Materials Co ltd
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Shanghai Aozhong Building Materials Co ltd
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Priority to CN202111018827.1A priority Critical patent/CN115215603A/en
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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
    • C04B28/04—Portland cements
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/304—Air-entrainers
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/48—Foam stabilisers
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • 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
    • C04B2111/76—Use at unusual temperatures, e.g. sub-zero
    • 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
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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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)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention relates to C04B38/02, in particular to a sand aerated building material and a preparation method thereof. The method comprises the following steps: 1) Preparation of raw materials: respectively grinding cement, quicklime, gypsum and fine sand to a certain fineness, and premixing the portland cement, the quicklime and the desulfurized gypsum for 8-12min; then adding fine sand and water, uniformly mixing to form mortar, adding water, stirring for 2-5min, adding an additive, stirring for 50-80s, sequentially adding a gas former and a foam stabilizer, and stirring for 80-100s to obtain slurry; 2) Standing and maintaining: and injecting the obtained slurry into a mold to form a blank, standing for curing and cutting. 3) Steam pressure curing: and (4) putting the cut blank into an autoclave for high-temperature autoclaving, and taking the blank out of the autoclave to obtain the sand aerated building material. The sand aerated building material prepared by the preparation method of the sand aerated building material provided by the invention has the advantages of heat preservation, heat insulation, light weight, sound absorption, earthquake resistance, fire resistance, simple construction and the like.

Description

Sand aerated building material and preparation method thereof
Technical Field
The invention relates to C04B38/02, in particular to a sand aerated building material and a preparation method thereof.
Background
The sand aerated concrete block is a light silicate product prepared by adopting calcareous materials (lime and cement) and siliceous materials (sand) as reaction raw materials, adding a gas former, and then carrying out preparation processes of proportioning, stirring, pouring, pre-curing, cutting, autoclaving, curing and the like, and is a multifunctional building material integrating heat insulation and sound absorption.
Patent CN201210321562.7 provides a quartz tailing autoclaved aerated concrete block and a preparation method thereof, the autoclaved aerated concrete block prepared from quartz tailing sand, cement and lime as raw materials has low cost and high yield.
Patent CN201710522843.1 provides a preparation method of a high-strength autoclaved aerated concrete block, which is made of siliceous materials and novel mortar, and improves the strength and durability of the autoclaved aerated concrete block.
However, in the prior art, the preparation process of the steam-pressurized concrete block is easy to generate cracks in the preparation process, so that the performance of the steam-pressurized concrete block is often reduced, and even the molding of the steam-pressurized concrete block is seriously influenced.
Disclosure of Invention
In order to solve the technical problems, the first aspect of the present invention provides a method for preparing a sand aerated building material, comprising the steps of:
1) Preparation of raw materials: respectively grinding portland cement, quicklime, desulfurized gypsum and fine sand to a certain fineness, and premixing the portland cement, the quicklime and the desulfurized gypsum for 8-12min; adding mortar formed by uniformly mixing fine sand and water, adding water, stirring for 2-5min, adding an additive, stirring for 50-80s, sequentially adding a gas former and a foam stabilizer, and stirring for 80-100s to obtain slurry;
2) Standing and maintaining: and injecting the obtained slurry into a mold to foam to form a blank, standing for curing, and cutting.
3) Steam pressure curing: and (3) putting the cut blank into an autoclave for high-temperature autoclaving, and taking the blank out of the autoclave to obtain the sand aerated building material.
Preferably, the mass ratio of the portland cement, the quicklime, the desulfurized gypsum and the fine sand is (3-8): (15-25): (0.3-0.7): (70-80).
Preferably, the cement, the quicklime and the gypsum are ground and then sieved by a 0.2mm square-hole sieve, and the respective sieving residue is less than 3wt%.
Preferably, the fine sand has an average particle size of 100 to 200 mesh.
Preferably, the portland cement is p.o42.5 ordinary portland cement.
Preferably, the content of the effective calcium oxide in the quicklime is 65-85wt%. The slaking time of the quicklime is 8-12min.
Preferably, caSO in the desulfurized gypsum 4 ·2H 2 The content of O is 85-95wt%.
Preferably, the minerals include quartz sand and zircon sand. The mass ratio of the quartz sand to the zircon sand is (10-15): (0.3-0.5).
Preferably, the silica content in the quartz sand is 80-90wt%, the mud content is not higher than 5wt%, and the quartz sand is purchased from mineral powder factories of Anda in Ling shou county.
Preferably, the content of silica in the zircon sand is 30-40wt%, the content of zirconia is 60-70wt%, and the content of mud is not higher than 3wt%.
The invention discovers that the mass ratio of the quartz sand to the zircon sand is (10-15): (0.3-0.5) can enhance the compressive strength of the sand aerated building material. Presumably, substances such as silicon dioxide and the like in the system react with the calcareous materials to generate a large amount of hydration products, the hydration products are continuously wrapped on the surface of sand grains, and large crystals penetrate into a large amount of small crystallization hydration products, so that the compressive strength of the sand aerated building material is enhanced. Meanwhile, substances such as zirconia and the like contained in the system inhibit the growth of cracks of the sand aerated building material, and improve the performances such as toughness, frost resistance and the like of the sand building material.
Preferably, the mass ratio of the fine sand to the water in the mortar is (7-8): (4-5).
Preferably, the admixture comprises a polycarboxylic acid water reducing agent and sodium lignosulfonate. The mass ratio of the polycarboxylic acid water reducing agent to the sodium lignosulphonate is (3-7): (2-4).
The additive accounts for 0.1-0.3wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
Preferably, the sulfonation degree of the sodium lignosulfonate is 0.6-0.8. The average molecular weight is 6000-8000.
Preferably, the gas generating agent comprises aluminum powder paste.
The addition amount of the gas former is 1.0-1.5kg/cm3.
More preferably, the aluminum paste is oil-type aluminum paste.
Preferably, the foam stabilizer comprises silicone amide and triethanolamine oleate soap. The mass ratio of the silicone amide to the triethanolamine oleic soap is (2-3) to (1-2).
The addition amount of the foam stabilizer accounts for 0.05-0.08wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
Preferably, the water-material ratio is 0.6-0.7. The water-material ratio refers to the ratio of the total water mass to the total material (except water) mass in the sand aerated building material.
Further preferably, the water-to-material ratio is 0.65.
Preferably, the static curing temperature is 45-52 ℃.
Preferably, the temperature rise time of the autoclaved curing is 1-2.5h. The condition that the temperature is too fast, the temperature difference between the inside and the outside of the billet is too large, a fine crack is generated, and the stability of the sand aerated building material is influenced is prevented.
Preferably, the constant temperature of the autoclaved curing is 170-195 ℃, the pressure of the constant temperature stage is 0.8-1.5MPa, and the constant temperature time is 7-10h.
Preferably, the vacuum degree of the steam pressure curing is-0.06-0.07 MPa.
The autoclaved curing stage is the most important stage for preparing the sand aerated concrete block, and the invention has the unexpected research that when the constant temperature is 170-195 ℃ and the pressure in the constant temperature stage is 0.8-1.5MPa, the dissolution of the components such as silicon dioxide and aluminum oxide in the substances such as portland cement, quicklime, desulfurized gypsum and fine sand is accelerated, and the reaction is easier to generate hydration products. The method can prevent the excessive constant temperature pressure from generating hydration products such as xonotlite and the like in the system, so that the types of the hydration products are changed, the compressive strength is reduced, and the performances such as the drying shrinkage value, the freezing resistance and the like are influenced.
The invention provides a sand aerated building material prepared by the preparation method of the sand aerated building material.
Has the advantages that:
the existing sand aerated building material inevitably generates cracks in the preparation process, but once the cracks are too much or too big, the cracks seriously affect the performance of the sand aerated building material. According to the invention, through controlling the process parameters in the preparation process, the sand aerated building material raw materials are mutually interpenetrated and tightly covered on the surface of the aggregate to form a high-crystallization hydration product, so that the generation of cracks is reduced, and meanwhile, substances such as zircon sand and the like contained in the system inhibit the growth of cracks of the sand aerated building material, so that the prepared sand aerated building material has the advantages of heat preservation, heat insulation, and better anti-seismic and fireproof performances.
Detailed Description
Examples
Example 1
A preparation method of a sand aerated building material comprises the following steps:
1) Preparation of raw materials: respectively grinding portland cement, quicklime, desulfurized gypsum and fine sand to a certain fineness, and premixing the portland cement, the quicklime and the desulfurized gypsum for 10min; adding mortar formed by uniformly mixing fine sand and water, adding water, stirring for 4min, adding an additive, stirring for 70s, sequentially adding a gas former and a foam stabilizer, and stirring for 87s to obtain slurry;
2) Standing and maintaining: and injecting the obtained slurry into a mold to foam to form a blank, standing for curing, and cutting.
3) Steam pressure curing: and (4) putting the cut blank into an autoclave for high-temperature autoclaving, and taking the blank out of the autoclave to obtain the sand aerated building material.
The mass ratio of the portland cement, the quicklime, the desulfurized gypsum to the fine sand is 3:15:0.3:70.
the silicate cement, the quicklime and the desulfurized gypsum are ground and then sieved by a 0.2mm square-hole sieve, and the respective sieving residual amount is less than 3wt%. The average particle size of the fine sand is 150 meshes.
The portland cement is P.O42.5 ordinary portland cement. The content of the effective calcium oxide in the quicklime is 65-85wt%. The digestion time of the quicklime is 8-12min. The content of CaSO4.2H2O in the desulfurized gypsum is 85-95wt%. The quicklime is purchased from Hengfeng lime powder factories in the town of Pingling in Longmen county. The desulfurized gypsum is available from Leixin Gypsum products, inc., of Jingmen.
The fine sand comprises quartz sand and zircon sand. The mass ratio of the quartz sand to the zircon sand is 14:0.2. the silica content in the quartz sand is 80-90wt%, the mud content is not higher than 5wt%, and the quartz sand is purchased from an Anda mineral powder factory in Lingshou county. The content of silicon dioxide in the zircon sand is 30-40wt%, the content of zirconium oxide is 60-70wt%, and the content of mud is not higher than 3wt%. Purchased from Runxin mineral processing plant, lingshu county.
The mass ratio of fine sand to water in the mortar is 7.5:4.5.
the additive comprises a polycarboxylic acid water reducing agent and sodium lignosulphonate. The mass ratio of the sodium lignosulphonate in the polycarboxylic acid water reducing agent is 5:3. the polycarboxylate superplasticizer is purchased from Shandong Huangteng building materials Co. The sulfonation degree of the sodium lignosulfonate is 0.6-0.8. The average molecular weight is 6000-8000. Purchased from overseas electricity international trade, inc. The trade mark is as follows: ARBO SO 1P. The additive accounts for 0.25wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The gas generating agent comprises aluminum powder paste. The aluminum powder paste is oil-type aluminum powder paste. The content of active aluminum in the aluminum powder paste is 95.4wt%. The gas former is purchased from Shandong blue Ben building materials Co. The addition amount of the gas former is 1.3kg/cm 3 。
The foam stabilizer comprises silicone amide and triethanolamine oleic soap. The mass ratio of the silicone amide to the triethanolamine oleate soap is 2.5. The addition amount of the foam stabilizer accounts for 0.07wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The water-material ratio is 0.65.
The static maintenance temperature is 48 ℃.
The temperature rise time of the autoclaved curing is 1.7h. The constant temperature of the autoclaved curing is 185 ℃, the constant temperature pressure is 1.1MPa, and the constant temperature time is 8h. The vacuum degree of the autoclaved curing is-0.065 MPa.
A sand aerated building material prepared according to the preparation method.
Example 2
A preparation method of a sand aerated building material comprises the following steps:
1) Preparation of raw materials: respectively grinding portland cement, quicklime, desulfurized gypsum and fine sand to a certain fineness, and premixing the portland cement, the quicklime and the desulfurized gypsum for 10min; adding mortar formed by uniformly mixing fine sand and water, adding water, stirring for 4min, adding an additive, stirring for 70s, sequentially adding a gas former and a foam stabilizer, and stirring for 87s to obtain slurry;
2) Standing and maintaining: and injecting the obtained slurry into a mold to form a blank, standing for curing and cutting.
3) Steam pressure curing: and (3) putting the cut blank into an autoclave for high-temperature autoclaving, and taking the blank out of the autoclave to obtain the sand aerated building material.
The mass ratio of the portland cement, the quicklime, the desulfurized gypsum to the fine sand is 4:17:0.4:73.
the Portland cement, the quicklime and the desulfurized gypsum are ground and then pass through a 0.2mm square-hole sieve, and the respective sieving residual amount is less than 3wt%. The average particle size of the fine sand is 150 meshes.
The portland cement is P.O42.5 ordinary portland cement. The content of the effective calcium oxide in the quicklime is 65-85wt%. The slaking time of the quicklime is 8-12min. CaSO in the desulfurized gypsum 4 ·2H 2 The content of O is 85-95wt%. The quicklime is purchased from Hengfeng lime powder factory in Town of Ping Ling county of Longmen. The desulfurized gypsum is purchased from Leixin gypsum products, inc., jingmen.
The fine sand comprises quartz sand and zircon sand. The mass ratio of the quartz sand to the zircon sand is 14:0.2. the silica content in the quartz sand is 80-90wt%, the mud content is not higher than 5wt%, and the quartz sand is purchased from an Anda mineral powder factory in Lingshou county. The content of silicon dioxide in the zircon sand is 30-40wt%, the content of zirconium oxide is 60-70wt%, and the content of mud is not higher than 3wt%. Purchased from Runxin mineral processing plant, lingshu county.
The mass ratio of fine sand to water in the mortar is 7.5:4.5.
the additive comprises a polycarboxylic acid water reducing agent and sodium lignosulphonate. The mass ratio of the polycarboxylate superplasticizer to the sodium lignosulfonate is 5:3. the polycarboxylate superplasticizer is purchased from Shandong Huangteng building materials Co. The sulfonation degree of the sodium lignosulfonate is 0.6-0.8. The average molecular weight is 6000-8000. Purchased from overseas electricity international trade, inc. The trade mark is: ARBO SO 1P. The additive accounts for 0.25wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The gas former comprises aluminum powder paste. The aluminum powder paste is oil-type aluminum powder paste. The content of active aluminum in the aluminum powder paste is 95.4wt%. The gas former is purchased from Shandong blue Ben building materials Co. The addition amount of the gas former is 1.3kg/cm 3 。
The foam stabilizer comprises silicone amide and triethanolamine oleic soap. The mass ratio of the silicone amide to the triethanolamine oleic soap was 2.5. The addition amount of the foam stabilizer accounts for 0.07wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The water-material ratio is 0.65.
The static maintenance temperature is 48 ℃.
The temperature rise time of the autoclaved curing is 1.7h. The constant temperature of the autoclaved curing is 185 ℃, the constant temperature pressure is 1.1MPa, and the constant temperature time is 8 hours. The vacuum degree of the autoclaved curing is-0.065 MPa.
A sand aerated building material prepared according to the preparation method.
Example 3
A preparation method of a sand aerated building material comprises the following steps:
1) Preparation of raw materials: respectively grinding portland cement, quicklime, desulfurized gypsum and fine sand to a certain fineness, and premixing the portland cement, the quicklime and the desulfurized gypsum for 10min; then adding fine sand and water, uniformly mixing to form mortar, adding water, stirring for 4min, adding an additive, stirring for 70s, sequentially adding a gas former and a foam stabilizer, and stirring for 87s to obtain slurry;
2) Standing and maintaining: and injecting the obtained slurry into a mold to foam to form a blank, standing for curing, and cutting.
3) Steam pressure curing: and (4) putting the cut blank into an autoclave for high-temperature autoclaving, and taking the blank out of the autoclave to obtain the sand aerated building material.
The mass ratio of the portland cement, the quicklime, the desulfurized gypsum to the fine sand is 4:17:0.4:73.
the silicate cement, the quicklime and the desulfurized gypsum are ground and then sieved by a 0.2mm square-hole sieve, and the respective sieving residual amount is less than 3wt%. The average particle size of the fine sand is 150 meshes.
The portland cement is P.O42.5 ordinary portland cement. The content of the effective calcium oxide in the quicklime is 65-85wt%. The slaking time of the quicklime is 8-12min. CaSO in the desulfurized gypsum 4 ·2H 2 The content of O is 85-95wt%. The quicklime is purchased from Hengfeng lime powder factories in the town of Pingling in Longmen county. The desulfurized gypsum is available from Leixin Gypsum products, inc., of Jingmen.
The fine sand in the mortar comprises quartz sand and zircon sand. The mass ratio of the quartz sand to the zircon sand is 14:0.2. the silica content in the quartz sand is 80-90wt%, the mud content is not higher than 5wt%, and the quartz sand is purchased from an Anda mineral powder factory in Lingshou county. The content of silicon dioxide in the zircon sand is 30-40wt%, the content of zirconium oxide is 60-70wt%, and the content of mud is not higher than 3wt%. Purchased from Runxin mineral processing plant, lingshu county.
The mass ratio of the fine sand to the water is 7.5:4.5.
the additive comprises a polycarboxylic acid water reducing agent and sodium lignosulphonate. The mass ratio of the sodium lignosulphonate in the polycarboxylic acid water reducing agent is 5:3. the polycarboxylate superplasticizer is purchased from Shandong Huangteng building materials Co. The sulfonation degree of the sodium lignosulfonate is 0.6-0.8. The average molecular weight is 6000-8000. Purchased from overseas electricity international trade, ltd. The trade mark is as follows: ARBO SO 1P. The additive accounts for 0.25wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The gas generating agent comprises aluminum powder paste. The aluminum powder paste is oil type aluminum powder paste. The content of active aluminum in the aluminum powder paste is 95.4wt%. The gas former is purchased from Shandong blue Ben building materials Co. The addition amount of the gas former is 1.3kg/cm 3 。
The foam stabilizer comprises silicone amide and triethanolamine oleic soap. The mass ratio of the silicone amide to the triethanolamine oleic soap was 2.5. The addition amount of the foam stabilizer accounts for 0.07wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The water-material ratio is 0.65.
The static maintenance temperature is 45 ℃.
The temperature rise time of the autoclaved curing is 1.7h. The constant temperature of the autoclaved curing is 185 ℃, the constant temperature pressure is 1.1MPa, and the constant temperature time is 8h. The vacuum degree of the autoclaved curing is-0.065 MPa.
A sand aerated building material prepared according to the preparation method.
Comparative example 1
A preparation method of a sand aerated building material comprises the following steps:
1) Preparation of raw materials: respectively grinding portland cement, quicklime, desulfurized gypsum and fine sand to a certain fineness, and premixing the portland cement, the quicklime and the desulfurized gypsum for 10min; then adding fine sand and water, uniformly mixing to form mortar, adding water, stirring for 4min, adding an additive, stirring for 70s, sequentially adding a gas former and a foam stabilizer, and stirring for 87s to obtain slurry;
2) Standing and maintaining: and injecting the obtained slurry into a mold to form a blank, standing for curing and cutting.
3) Steam pressure curing: and (3) putting the cut blank into an autoclave for high-temperature autoclaving, and taking the blank out of the autoclave to obtain the sand aerated building material.
The mass ratio of the portland cement, the quicklime, the desulfurized gypsum to the fine sand is 4:17:0.4:73.
the silicate cement, the quicklime and the desulfurized gypsum are ground and then sieved by a 0.2mm square-hole sieve, and the respective sieving residual amount is less than 3wt%. The average particle size of the fine sand is 150 meshes.
The portland cement is P.O42.5 ordinary portland cement. The content of the effective calcium oxide in the quicklime is 65-85wt%. The slaking time of the quicklime is 8-12min. CaSO in the desulfurized gypsum 4 ·2H 2 The content of O is 85-95wt%. The quicklime is purchased from Hengfeng lime powder factories in the town of Pingling in Longmen county. The desulfurized gypsum is available from Leixin Gypsum products, inc., of Jingmen.
The fine sand comprises quartz sand and zircon sand. The mass ratio of the quartz sand to the zircon sand is 14:1. the silica content in the quartz sand is 80-90wt%, the mud content is not higher than 5wt%, and the quartz sand is purchased from an Anda mineral powder factory in Lingshou county. The zircon sand contains 30-40wt% of silicon dioxide, 60-70wt% of zirconium oxide and not more than 3wt% of mud. Purchased from Runxin mineral processing plant, lingshui county.
The mass ratio of fine sand to water in the mortar is 7.5:4.5.
the additive comprises a polycarboxylic acid water reducing agent and sodium lignosulphonate. The mass ratio of the sodium lignosulphonate in the polycarboxylic acid water reducing agent is 5:3. the polycarboxylate superplasticizer is purchased from Shandong Huangteng building materials Co. The sulfonation degree of the sodium lignosulfonate is 0.6-0.8. The average molecular weight is 6000-8000. Purchased from overseas electricity international trade, ltd. The trade mark is as follows: ARBO SO 1P. The additive accounts for 0.25wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The gas generating agent comprises aluminum powder paste. The aluminum powder paste is oil type aluminum powder paste. The content of active aluminum in the aluminum powder paste is 95.4wt%. The gas former is purchased from Shandong blue Ben building materials Co. The addition amount of the gas former is 1.3kg/cm 3 。
The foam stabilizer comprises silicone amide and triethanolamine oleic soap. The mass ratio of the silicone amide to the triethanolamine oleic soap was 2.5. The addition amount of the foam stabilizer accounts for 0.07wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The water-material ratio is 0.65.
The static maintenance temperature is 48 ℃.
The temperature rise time of the autoclaved curing is 1.7h. The constant temperature of the autoclaved curing is 185 ℃, the constant temperature pressure is 1.1MPa, and the constant temperature time is 8h. The vacuum degree of the autoclaved curing is-0.065 MPa.
A sand aerated building material prepared according to the preparation method.
Comparative example 2
A preparation method of a sand aerated building material comprises the following steps:
1) Preparation of raw materials: respectively grinding portland cement, quicklime, desulfurized gypsum and fine sand to a certain fineness, and premixing the portland cement, the quicklime and the desulfurized gypsum for 10min; then adding fine sand and water, uniformly mixing to form mortar, adding water, stirring for 4min, adding an additive, stirring for 70s, sequentially adding a gas former and a foam stabilizer, and stirring for 87s to obtain slurry;
2) Standing and maintaining: and injecting the obtained slurry into a mold to foam to form a blank, standing for curing, and cutting.
3) Steam pressure curing: and (4) putting the cut blank into an autoclave for high-temperature autoclaving, and taking the blank out of the autoclave to obtain the sand aerated building material.
The mass ratio of the portland cement, the quicklime, the desulfurized gypsum to the fine sand is 4:17:0.4:73.
the Portland cement, the quicklime and the desulfurized gypsum are ground and then pass through a 0.2mm square-hole sieve, and the respective sieving residual amount is less than 3wt%. The average particle size of the fine sand is 150 meshes.
The portland cement is P.O42.5 ordinary portland cement. The content of the effective calcium oxide in the quicklime is 65-85wt%. The slaking time of the quicklime is 8-12min. CaSO in the desulfurized gypsum 4 ·2H 2 The content of O is 85-95wt%. The quicklime is purchased from Hengfeng lime powder factories in the town of Pingling in Longmen county. The desulfurized gypsum is available from Leixin Gypsum products, inc., of Jingmen.
The fine sand in the mortar comprises quartz sand and zircon sand. The mass ratio of the quartz sand to the zircon sand is 14:0.2. the quartz sand contains 80-90wt% of silicon dioxide and not more than 5wt% of mud, and is purchased from an Anda mineral powder factory in Ling shou county. The content of silicon dioxide in the zircon sand is 30-40wt%, the content of zirconium oxide is 60-70wt%, and the content of mud is not higher than 3wt%. Purchased from Runxin mineral processing plant, lingshu county.
The mass ratio of the fine sand to the water is 7.5:4.5.
the additive comprises a polycarboxylic acid water reducing agent and sodium lignosulphonate. The mass ratio of the polycarboxylate superplasticizer to the sodium lignosulfonate is 5:3. the polycarboxylate superplasticizer is purchased from Shandong Huangteng building materials Co. The sulfonation degree of the sodium lignosulfonate is 0.6-0.8. The average molecular weight is 6000-8000. Purchased from overseas electricity international trade, inc. The trade mark is as follows: ARBO SO 1P. The additive accounts for 0.25wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The gas generating agent comprises aluminum powder paste. The aluminum powder paste is oil type aluminum powder paste. The content of active aluminum in the aluminum powder paste is 95.4wt%. The gas former is purchased from Shandong blue Ben building materials Co. The addition amount of the gas former is 1.3kg/cm 3 。
The foam stabilizer comprises silicone amide and triethanolamine oleic soap. The mass ratio of the silicone amide to the triethanolamine oleate soap is 2.5. The addition amount of the foam stabilizer accounts for 0.07wt% of the total mass of the cement, the quicklime, the gypsum and the fine sand.
The water-material ratio is 0.65.
The static maintenance temperature is 48 ℃.
The temperature rise time of the autoclaved curing is 1.7h. The constant temperature of the autoclaved curing is 200 ℃, the constant temperature pressure is 1.1MPa, and the constant temperature time is 8 hours. The vacuum degree of the autoclaved curing is-0.065 MPa.
A sand aerated building material prepared according to the preparation method.
Performance test
1. Dimensional deviation and appearance: the total amount of each sample is 50 according to GB/T11968-2006;
2. and (3) testing the compressive strength: testing according to GB/T11969-2008;
3. freezing resistance: testing according to GB/T11969-2008;
4. radionuclide limits: testing was carried out according to GB 6566-2010.
Table 1 results of performance testing
Figure BDA0003241004080000101

Claims (10)

1. The preparation method of the sand aerated building material is characterized by comprising the following steps of:
1) Preparation of raw materials: respectively grinding portland cement, quicklime, desulfurized gypsum and fine sand to a certain fineness, and premixing the portland cement, the quicklime and the desulfurized gypsum for 8-12min; adding mortar formed by uniformly mixing fine sand and water, adding water, stirring for 2-5min, adding an additive, stirring for 50-80s, sequentially adding a gas former and a foam stabilizer, and stirring for 80-100s to obtain slurry;
2) Standing and maintaining: and injecting the obtained slurry into a mold to foam to form a blank, standing for curing, and cutting.
3) Steam pressure curing: and (4) putting the cut blank into an autoclave for high-temperature autoclaving, and taking the blank out of the autoclave to obtain the sand aerated building material.
2. The method for preparing the sand air-entrained building material according to claim 1, wherein the portland cement, the quicklime and the desulfurized gypsum are ground and then sieved through a 0.2mm square-hole sieve, and the respective sieving residue is less than 3wt%.
3. The method for preparing the sand aerated building material according to claim 1, wherein the fine sand has an average particle size of 100-200 meshes.
4. The method of claim 1 or 3, wherein the fine sand comprises quartz sand and zircon sand.
5. The method for preparing the sand aerated building material according to claim 4, wherein the silica content in the quartz sand is 80-90wt%, and the mud content is not higher than 5wt%.
6. The method for preparing the sand aerated building material according to claim 4, wherein the zircon sand contains 30-40wt% of silica, 60-70wt% of zirconia and not more than 3wt% of mud.
7. A method of making a sand aerated building material according to any of claims 1 to 6, wherein the static curing temperature is 45 to 52 ℃.
8. The method for preparing the sand aerated building material according to any one of claims 1 to 6, wherein the temperature rise time of the autoclaved curing is 1 to 2.5 hours.
9. The method for preparing the sand aerated building material according to any one of claims 1 to 6, wherein the constant temperature of the autoclaved curing is 170 to 195 ℃, and the pressure of the constant temperature stage is 0.8 to 1.5MPa.
10. A sand aerated building material made by the method of making a sand aerated building material of any of claims 1-9.
CN202111018827.1A 2021-09-01 2021-09-01 Sand aerated building material and preparation method thereof Pending CN115215603A (en)

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