CN105541384B - A kind of ultralight foam concrete and preparation method thereof - Google Patents

A kind of ultralight foam concrete and preparation method thereof Download PDF

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Publication number
CN105541384B
CN105541384B CN201510999989.6A CN201510999989A CN105541384B CN 105541384 B CN105541384 B CN 105541384B CN 201510999989 A CN201510999989 A CN 201510999989A CN 105541384 B CN105541384 B CN 105541384B
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foam concrete
concrete
ultralight foam
parts
water
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CN201510999989.6A
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Chinese (zh)
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CN105541384A (en
Inventor
何向东
贾兴文
王洪木
蔡静
胡皞
司端科
张新
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重庆建工第二建设有限公司
重庆大学
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/06Aluminous cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40Porous or lightweight materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20Mortars, concrete or artificial stone characterised by specific physical values for the density
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/30Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32Mortars, 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
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The present invention relates to a kind of ultralight foam concrete and preparation method thereof, this ultralight foam concrete is made using materials such as Portland cement, quick hardening sulphoaluminate cement, concrete mixing plant sludge, polycarboxylate water-reducer, redispersable latex powder, hydroxypropyl methyl cellulose ether, calcium stearate, sintering shale brick powder, polypropylene fibre, hydrogen peroxide and water, and using steps such as stirring, mixing, foaming, pouring molding, maintenances.The present invention possesses the advantages that cost is low, waste utilization rate is high, hydrogen peroxide bubbling efficiency is high, ultralight foam concrete physical and mechanical property is good, has reached the good result that ultralight foam concrete is prepared using building waste and discarded object.This ultralight foam concrete is used for roof heat insulation, wall cavity filling and flooring insulation.

Description

A kind of ultralight foam concrete and preparation method thereof
Technical field
The present invention relates to a kind of ultralight foam concrete and preparation method thereof, belongs to building energy-saving heat-insulating material technology neck Domain.
Background technology
Ultralight foam concrete is often referred to dry density and is not more than 300kg/m3Foam concrete, but in practical application When, ultralight foam concrete is typically designed to 150-200kg/m3.Being mainly used for for ultralight foam concrete is empty as wall Chamber packing material is used for the heat insulation integrated materials for wall of preparation structure, to improve the incubation and thermal insulation function of building.Ultralight foam Concrete can be also used for roof heat insulation and flooring insulation, can be used for foundation filling etc..
Foaming agent currently used for preparing ultralight foam concrete is mainly physical blowing agent and CBA.It is the most frequently used CBA be hydrogen peroxide.When preparing ultralight foam concrete using hydrogen peroxide as foaming agent, due to decomposing hydrogen dioxide solution Reaction speed is slower, and decomposition efficiency is low, it is therefore necessary to increases dioxygen water consumption, also needs 50-60 DEG C of hot water of admixture to improve ultralight bubble Foam concrete slurry temperature, so as to improve decomposing hydrogen dioxide solution reaction speed and efficiency, to reduce the apparent of ultralight foam concrete Density and thermal conductivity factor.But after rise slurry temperature, the limitation of decomposing hydrogen dioxide solution raising rate is accelerated, and causes a large amount of gases to overflow Go out, slurry may be caused to collapse on the contrary.In addition, rise slurry temperature produces temperature after also resulting in ultralight foam concrete hardening Contraction fissure.In order to avoid a large amount of oxygen overflow caused by hydrogen peroxide fast decoupled, the mode of generally use is in production process Fill thickener and foam stabilizer.But increase thickener and foam stabilizer dosage cause ultralight foam concrete to prepare cost rise.
Caused sewage is filtered and more after concrete mixing plant sludge mainly rinses concrete tank and mixing plant Caused floc sludge after level precipitation, its main component is unhydrated cement granules, flyash, sand, the pH of the floc sludge It is worth for more than 12.0, therefore, concrete mixing plant sludge also has certain activity, and simply activity is relatively low.In addition, stirring Sludge specific surface area of standing is 3-5 times of Portland cement, and therefore, it has good filing effect.These sludge are regular Clear and be deposited in production plant area.Many concrete mixing plants are deposited in the sludge cleared is at random in plant area, The problem of sludge air storage gives free rein to drying, does not only result in serious dust pollution, and sewage trickles, also results in some stirrings Station also needs to the sludge and waste residue of consuming fund periodic cleaning stacking.Understand because sludge is spiked into normal concrete to its mechanics Performance has a negative impact, therefore the sludge of mixing plant belongs to discarded object.Because sludge is not used effectively but, so as to produce Serious sewage pollution and dust pollution question.
The content of the invention
In order to avoid the ultralight foam concrete caused by increase thickener and foam stabilizer dosage prepares cost rise problem, The present invention provides a kind of ultralight foam concrete and preparation method thereof, and present invention selection is cheap, is readily available, is easy to point Dissipate, there is admixture of the concrete mixing plant sludge of certain hydration activity as ultralight foam concrete, and select price low It is honest and clean, prepare the catalyst that simple sintering shale brick powder reacts as decomposing hydrogen dioxide solution.
The present inventor is found by experiment that, after 105-110 DEG C of drying of flocky precipitate in concrete stirring station sedimentation basin Obtained concrete mixing plant sludge, primary aqueous and ultra-fine grain, specific surface area 800-1100m2/ kg, activity index are 65%-70%, pH value are more than 12.0, wherein, admixture of the ultra-fine grain as ultralight foam concrete, and water is as mix Water, reduces the dosage of running water, and pH value more than 12.0 is advantageous to dioxygen Water blown.Fill concrete mixing plant sludge and sintering Shale brick powder makes the mass output rate of ultralight foam concrete improve 1.2-1.4 times, and dry density reduces 20%-30%.
The technical scheme that the present invention solves above-mentioned technical problem is as follows:A kind of ultralight foam concrete, in parts by weight, by The following raw material forms:
Portland cement:80-120 parts
Quick hardening sulphoaluminate cement:10-40 parts
Concrete mixing plant sludge:40-10 parts
Polycarboxylate water-reducer:0.5-1.5 parts
Redispersable latex powder:2-4 parts
Hydroxypropyl methyl cellulose ether:0.1-0.4 parts
Polypropylene fibre:1-3 parts
Calcium stearate:0.2-0.4 parts
Sintering shale brick powder:0.5-2.0 parts
Hydrogen peroxide:6-8 parts
Water:50-80 parts.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, the Portland cement is 52.5 grades of Portland cements.
Beneficial effect using this step is that 52.5 grades of Portland cements are enhancing components, mainly as gel material Material.
Further, the quick hardening sulphoaluminate cement is 42.5 grades of quick hardening sulphoaluminate cements.
Beneficial effect using this step is that 42.5 grades of quick hardening sulphoaluminate cements are accelerating components, and only enhancing is not made With, slurry condensation setting rate is may also speed up, avoids the mould that collapses, while also accelerate mould turnaround speed, improve production efficiency.
Further, the concrete mixing plant sludge is by 105-110 DEG C of flocky precipitate in concrete stirring station sedimentation basin Obtained after drying, the specific surface area of concrete mixing plant sludge is 800-1100m2/kg。
Beneficial effect using this step is that the floc sludge cleaned out in concrete stirring station sedimentation basin contains largely Ultra-fine grain, these ultra-fine grain specific surface areas are very high and have certain activity, can mixing as ultralight foam concrete Material is closed, has the function that to increase slurry denseness and stability, is also beneficial to improve ultralight foam concrete later strength, with mixed The increase of solidifying soil mixing station sludge volume, because ultra-fine grain specific surface area is big and density is small, ultralight foam concrete slurry body Product will significantly increase, so as to advantageously reduce the dry density of ultralight foam concrete.
Further, the polycarboxylate water-reducer is ethers polycarboxylic acid water reducing agent, solid content 20%.
Beneficial effect using this step is that ethers polycarboxylic acid water reducing agent plays raising fresh paste mobility and reduces mix Water consumption, reduce the effect of dry density.
Further, the redispersable latex powder is polyvinyl acetate-ethylene copolymer latex powder (VAE).
The beneficial effect for using this step is polyvinyl acetate-ethylene copolymer latex powder (VAE) to be water-soluble redispersible Powder, it is that one kind can strengthen slurry cohesive force, cohesive force and flexible organic cementing material.
Further, the viscosity of the hydroxypropyl methyl cellulose ether (HPMC) is 100,000 Pa 〃 s.
Beneficial effect using this step is that hydroxypropyl methyl cellulose ether plays and significantly increases slurry cohesiveness, water conservation The effect of property, thickening property and stability.
Further, the polypropylene fibre is polypropylene monofil cut staple.
Beneficial effect using this step be polypropylene monofil cut staple play improve ultralight foam concrete anti-folding it is strong Degree, strengthen the crack resistance effect of ultralight foam concrete.
Further, the sintering shale brick powder is crossed 75 tm screens for sintering shale brick and obtained after crushed, sintering shale brick It is derived from the building waste sintering shale brick of gained after brick setting is removed.
Beneficial effect using this step is to contain Fe in sintering shale brick powder2O3, have catalytic action to decomposing hydrogen dioxide solution.
Further, the mass concentration of the hydrogen peroxide is 30%.
Beneficial effect using this step is that hydrogen peroxide produces oxygen as CBA, decomposition, and oxygen is wrapped in material Substantial amounts of hole is formed in slurry, so as to form foam concrete.
Further, the water is running water, need not be heated using summer during running water, and winter needs to ensure that water temperature is 20- 30℃。
Beneficial effect using this step is that 20-30 DEG C of running water will not cause decomposing hydrogen dioxide solution raising rate to be accelerated, Also ultralight foam concrete will not be caused to produce temperature shrinkage fracture after hardening.The effect of water is that wetting powder body material forms slurry Body.
The present invention also provides a kind of preparation method of above-mentioned ultralight foam concrete, including:
1) Portland cement, quick hardening sulphoaluminate cement, polycarboxylate water-reducer, redispersable latex powder, hydroxypropyl are taken Ylmethyl cellulose ether, polypropylene fibre, calcium stearate and sintering shale brick powder, are stirred and evenly mixed, and add water, and stirring forms stream Stand-by after body shape slurry, it is forced mixer to stir instrument twice, and each mixing time is 30 seconds;
2) concrete mixing plant sludge being added in the flow-like slurry 1) obtained, forced mixer stirs 60 seconds, Obtain slurry;
3) hydrogen peroxide is added in the slurry 2) obtained, the high speed agitator stirring 15-30 seconds, initially formed to bubble (refer to slurry start to occur volume increase at the time of), obtains mixture;
4) mixture 3) obtained is poured into mould form removal after normal temperature standing 1d or is poured into materials for wall cavity, Then it is placed under normal temperature laboratory and conserves 28d, obtains ultralight foam concrete.
In 1), because the dosage of hydroxypropyl methyl cellulose ether and calcium stearate is fewer, using weighing precision 0.1g Projection electronic weighing after add make its deal accurate.
In 4), shaping and maintaining process belong to general knowledge known in this field.
When the present invention is implemented, easy for construction without using special mixing plant and construction equipment, preparation cost is low, ultralight Foam concrete dry density reduces 20%-30% than ultralight foam concrete prepared by prior art.Ultralight foam after hardening Early age strength of concrete is high, and 3d compression strength reaches 0.3MPa;Later strength has also increased, and 28d compression strength reaches 0.6MPa;Dry density 160-180kg/m3, water absorption rate is less than 20%, and product index is apparently higher than construction industry standard JG/T407- 2013《Self-insulating concrete composite block》In requirement for foam concrete.The present invention is used to produce heat preservation plate material, roofing When insulation blocks and bottling wall cavity, it can meet to require with reference to the construction technology of routine, and ultralight foam concrete is with mixing The adhesive strength of the basic units such as solidifying soil, shale brick, building block, stone material is higher, is less prone to hollowing, ftractures and the construction quality such as come off is asked Topic.
The beneficial effects of the invention are as follows:
(1) major gelled material used in the present invention is Portland cement, is additionally given birth to using concrete mixing plant The floc sludge for producing but being difficult by during production is raw materials wide material sources, cheap therefore super as admixture Light foam concrete raw material, which prepares cost, substantially to be reduced, easy to utilize;By the use of floc sludge as admixture, be advantageous to carry High slurry denseness and foam stability energy, while be also beneficial to improve later strength.
(2) the sintering shale brick powder used plays a part of catalyst, it is ensured that hydrogen peroxide is more complete point in slurry Solution, so as to be effectively reduced the dry density of ultralight foam concrete, makes ultralight foam concrete have good heat-insulating property, does Density is less than 200kg/m3, thermal conductivity factor is less than 0.060W/ (m 〃 K), and compression strength reaches 0.6MPa.
(3) by filling the additives such as redispersable latex powder, methylhydroxypropylcellulose ether, ultralight foam is significantly improved The rheological characteristic of concrete, the denseness and foam stability energy of slurry are improved, with the intensity and water resistance for also improving ultralight foam concrete. Admixture polypropylene fibre is favorably improved the rupture strength and crack resistance of ultralight foam concrete.
(4) admixture calcium stearate can not only improve the foam stability of ultralight foam concrete slurry, can also reduce hardening The water absorption rate of ultralight foam concrete afterwards, for improving bubble stability and extending the bubble-break cycle so that generation surpasses Evenly, aperture is smaller, reduces its dry density and thermal conductivity factor for light foam concrete internal void, reduces water absorption rate and may insure Its thermal conductivity factor will not significantly increase in use, so as to improve its thermal and insulating performance.
(5) it is less than 200kg/m through overtesting, ultralight foam concrete produced by the present invention, dry density3, compression strength reaches To 0.5-0.6MPa, rupture strength reaches 0.3MPa, is a kind of insulation material of high-strength light.
(6) when the present invention is implemented, each specific steps are still common process, are highly susceptible to factorial construction.
Embodiment
The principles and features of the present invention are described below, and the given examples are served only to explain the present invention, is not intended to limit Determine the scope of the present invention.
Embodiment 1
The material component and its volume of mixing ratio used in the present embodiment is as follows:
52.5 level Portland cement:120kg
42.5 level quick hardening sulphoaluminate cement:20kg
Concrete mixing plant sludge:40kg
Solid content is 20% ethers polycarboxylic acid water reducing agent:0.5kg
Polyvinyl acetate-ethylene copolymer latex powder (VAE):2kg
Viscosity is 100,000 Pas hydroxypropyl methyl cellulose ether (HPMC):0.1kg
Polypropylene monofil cut staple:1kg
Calcium stearate:0.2kg
Sintering shale brick powder:1.0kg
The hydrogen peroxide of mass concentration 30.0%:6kg
Running water:80kg
Wherein, the sintering shale brick powder is crossed 75 tm screens for sintering shale brick and obtained after crushed, and the concrete stirs Station sludge is mixed by being obtained after 105-110 DEG C of drying of flocky precipitate in concrete stirring station sedimentation basin, specific surface area 800- 1100m2/kg。
It is made using following steps:
A, 52.5 grades of Portland cements, 42.5 grades of quick hardening sulphoaluminate cements, ethers polycarboxylic acid water reducing agent, poly-vinegars are taken Sour ethylene-vinyl emulsion copolymer powder, hydroxypropyl methyl cellulose ether, polypropylene monofil cut staple, calcium stearate and sintering shale Brick powder, is uniformly mixed, and adds running water, and stirring forms stand-by after flow-like slurry, and it is strong to stir instrument twice Standard mixer, each mixing time are 30 seconds;
B, concrete mixing plant sludge is added in the flow-like slurry that a steps obtain, forced mixer stirring 60 Second, obtain slurry;
C, hydrogen peroxide is added in the slurry that b step obtains, the high speed agitator stirring 15-30 seconds, starts shape to bubble Into obtaining mixture;
D, the mixture for obtaining step c is poured into mould form removal after 1d, is then placed under normal temperature laboratory and conserves 28d, Obtain the ultralight foam concrete with good physical mechanical property.
Embodiment 2
The material component and its volume of mixing ratio used in the present embodiment is as follows:
52.5 level Portland cement:100kg
42.5 level quick hardening sulphoaluminate cement:30kg
Concrete mixing plant sludge:60kg
Solid content is 20% ethers polycarboxylic acid water reducing agent:1.0kg
Polyvinyl acetate-ethylene copolymer latex powder (VAE):2.5kg
Viscosity is 100,000 Pas hydroxypropyl methyl cellulose ether (HPMC):0.2kg
Polypropylene monofil cut staple:1.5kg
Calcium stearate:0.3kg
Sintering shale brick powder:1.5kg
The hydrogen peroxide of mass concentration 30.0%:6.5kg
Running water:60kg
Wherein, the sintering shale brick powder is crossed 75 tm screens for sintering shale brick and obtained after crushed, and the concrete stirs Station sludge is mixed by being obtained after 105-110 DEG C of drying of flocky precipitate in concrete stirring station sedimentation basin, specific surface area 800- 1100m2/kg。
Specific preparation process and embodiment 1 are identical in the present embodiment.
Embodiment 3
The material component and its volume of mixing ratio used in the present embodiment is as follows:
52.5 level Portland cement:100kg
42.5 level quick hardening sulphoaluminate cement:40kg
Concrete mixing plant sludge:80kg
Solid content is 20% ethers polycarboxylic acid water reducing agent:1.0kg
Polyvinyl acetate-ethylene copolymer latex powder (VAE):3.0kg
Viscosity is 100,000 Pas hydroxypropyl methyl cellulose ether (HPMC):0.2kg
Polypropylene monofil cut staple:1.5kg
Calcium stearate:0.3kg
Sintering shale brick powder:1.5kg
The hydrogen peroxide of mass concentration 30.0%:7kg
Running water:60kg
Wherein, the sintering shale brick powder is crossed 75 tm screens for sintering shale brick and obtained after crushed, and the concrete stirs Station sludge is mixed by being obtained after 105-110 DEG C of drying of flocky precipitate in concrete stirring station sedimentation basin, specific surface area 800- 1100m2/kg。
Specific preparation process and embodiment 1 are identical in the present embodiment.
Embodiment 4
The material component and its volume of mixing ratio used in the present embodiment is as follows:
52.5 level Portland cement:90kg
42.5 level quick hardening sulphoaluminate cement:40kg
Concrete mixing plant sludge:80kg
Solid content is 20% ethers polycarboxylic acid water reducing agent:1.25kg
Polyvinyl acetate-ethylene copolymer latex powder (VAE):3.0kg
Viscosity is 100,000 Pas hydroxypropyl methyl cellulose ether (HPMC):0.3kg
Polypropylene monofil cut staple:2.0kg
Calcium stearate:0.3kg
Sintering shale brick powder:1.5kg
The hydrogen peroxide of mass concentration 30.0%:7kg
Running water:50kg
Wherein, the sintering shale brick powder is crossed 75 tm screens for sintering shale brick and obtained after crushed, and the concrete stirs Station sludge is mixed by being obtained after 105-110 DEG C of drying of flocky precipitate in concrete stirring station sedimentation basin, specific surface area 800- 1100m2/kg。
Specific preparation process and embodiment 1 are identical in the present embodiment.
Embodiment 5
The material component and its volume of mixing ratio used in the present embodiment is as follows:
52.5 level Portland cement:80kg
42.5 level quick hardening sulphoaluminate cement:40kg
Concrete mixing plant sludge:100kg
Solid content is 20% ethers polycarboxylic acid water reducing agent:1.5kg
Polyvinyl acetate-ethylene copolymer latex powder (VAE):3kg
Viscosity is 100,000 Pas hydroxypropyl methyl cellulose ether (HPMC):0.4kg
Polypropylene monofil cut staple:2kg
Calcium stearate:0.4kg
Sintering shale brick powder:2.0kg
The hydrogen peroxide of mass concentration 30.0%:8kg
Running water:40kg
Wherein, the sintering shale brick powder is crossed 75 tm screens for sintering shale brick and obtained after crushed, and the concrete stirs Station sludge is mixed by being obtained after 105-110 DEG C of drying of flocky precipitate in concrete stirring station sedimentation basin, specific surface area 800- 1100m2/kg。
Specific preparation process and embodiment 1 are identical in the present embodiment.
Experimental result
By embodiment 1, embodiment 3 and embodiment 5 according to national standard《Foam concrete》(JG/T266-2011) will Ask shaping test piece, test mechanical property, thermal conductivity factor and water absorption rate.Experimental method and result are as follows:
1) the measure reference of the compression strength of test specimen《Foam concrete》(JG/T 266-2011), result of the test is shown in Table 1.
Mechanical property/MPa of 1 ultralight foam concrete of table
2) dry density of ultralight foam concrete and Measured Results of Thermal Conductivity reference《Foam concrete》(JG/T266-2011), Result of the test is shown in Table 2.
The dry density and thermal conductivity factor of 2 ultralight foam concrete of table
3) the water absorption rate measure reference of ultralight foam concrete《Foam concrete》(JG/T 266-2011), result of the test It is shown in Table 3.
The water absorption rate (%) of 3 ultralight foam concrete of table
Age 28d
Embodiment 1 15.8
Embodiment 3 18.6
Embodiment 5 16.9
The ultralight foam concrete of the invention prepared can be seen that according to above test data and meet national standard JG/ T407—2013《Self-insulating concrete composite block》In performance requirement on ultralight foam concrete, dry density is 160~ 200kg/m3, 28d compression strength minimum is 0.50MPa, more than dry density 300kg/m in professional standard3Foam concrete resist Compressive Strength should be greater than 0.3MPa requirement, and thermal conductivity factor is also smaller than 0.060W/ (m 〃 K).Moreover, ultralight foam of the present invention Concrete water absorption rate is smaller, and with the increase of calcium stearate volume, the water absorption rate of ultralight foam concrete gradually reduces, and illustrates this Invention is not hygroscopic in actual use and causes thermal property to reduce, and is favorably improved the heat insulating ability of ultralight foam concrete Can, avoid ultralight foam concrete and produce temperature-caused shrinkage and heat-insulating property is obvious because water absorption rate is high in use The risk of decline.
Wherein, the thermal conductivity factor of embodiment 3 is minimum, and thermal property is optimal, is suitable for build high to heat-insulating property requirement Build;The mechanical property of embodiment 1 is optimal, and early strength is also optimal, helps speed up speed of application;The economy of embodiment 5 is best, and Its mechanical property, thermal property are very good, can be as the optimum mix of actual production.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.

Claims (8)

1. a kind of ultralight foam concrete, it is characterised in that in parts by weight, be made up of the following raw material:
Portland cement:80-120 parts
Quick hardening sulphoaluminate cement:10-40 parts
Concrete mixing plant sludge:40-10 parts
Polycarboxylate water-reducer:0.5-1.5 parts
Redispersable latex powder:2-4 parts
Hydroxypropyl methyl cellulose ether:0.1-0.4 parts
Polypropylene fibre:1-3 parts
Calcium stearate:0.2-0.4 parts
Sintering shale brick powder:0.5-2.0 parts
Hydrogen peroxide:6-8 parts
Water:50-80 parts
Wherein, after the concrete mixing plant sludge is by 105-110 DEG C of drying of flocky precipitate in concrete stirring station sedimentation basin Obtain, the specific surface area of concrete mixing plant sludge is 800-1100m2/ kg, the sintering shale brick powder pass through for sintering shale brick 75 tm screens are crossed after crushing and are obtained, and the mass concentration of the hydrogen peroxide is 30%.
2. ultralight foam concrete according to claim 1, it is characterised in that the Portland cement is 52.5 grades Portland cement;The quick hardening sulphoaluminate cement is 42.5 grades of quick hardening sulphoaluminate cements.
3. ultralight foam concrete according to claim 1, it is characterised in that the polycarboxylate water-reducer is the poly- carboxylic of ethers Sour water reducer, solid content 20%.
4. ultralight foam concrete according to claim 1, it is characterised in that the redispersable latex powder is poly-vinegar acid Ethylene-vinyl emulsion copolymer powder.
5. ultralight foam concrete according to claim 1, it is characterised in that the hydroxypropyl methyl cellulose ether glues Spend for 100,000 Pas.
6. ultralight foam concrete according to claim 1, it is characterised in that the polypropylene fibre is polypropylene monofilament Chopped fiber.
7. ultralight foam concrete according to claim 1, it is characterised in that the water is running water, uses running water Shi Xiaji need not be heated, and winter needs to ensure that water temperature is 20-30 DEG C.
A kind of 8. preparation method of ultralight foam concrete as claimed in claim 1, it is characterised in that including:
1) Portland cement, quick hardening sulphoaluminate cement, polycarboxylate water-reducer, redispersable latex powder, hydroxypropyl first are taken Base cellulose ether, polypropylene fibre, calcium stearate and sintering shale brick powder, are stirred and evenly mixed, and add water, and stirring forms flow-like Stand-by after slurry, it is forced mixer to stir instrument twice, and each mixing time is 30 seconds;
2) concrete mixing plant sludge is added in the flow-like slurry 1) obtained, forced mixer stirs 60 seconds, must starch Body;
3) hydrogen peroxide is added in the slurry 2) obtained, the high speed agitator stirring 15-30 seconds, initially forms, obtain mixed to bubble Compound;
4) mixture 3) obtained is poured into mould form removal after normal temperature standing 1d or be poured into materials for wall cavity, then It is placed under normal temperature laboratory and conserves 28d, obtains ultralight foam concrete.
CN201510999989.6A 2015-12-28 2015-12-28 A kind of ultralight foam concrete and preparation method thereof CN105541384B (en)

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