CN102633525A - Foam concrete with desulfurized gypsum as main cementing material and preparation method of foam concrete - Google Patents
Foam concrete with desulfurized gypsum as main cementing material and preparation method of foam concrete Download PDFInfo
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- CN102633525A CN102633525A CN2012101269035A CN201210126903A CN102633525A CN 102633525 A CN102633525 A CN 102633525A CN 2012101269035 A CN2012101269035 A CN 2012101269035A CN 201210126903 A CN201210126903 A CN 201210126903A CN 102633525 A CN102633525 A CN 102633525A
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Abstract
The invention belongs to the technical field of building materials, in particular relates to foam concrete with desulfurized gypsum as a main cementing material. The foam concrete comprises desulfurized gypsum, slag powder, coal ash, cement, a foaming agent, a foam stabilizer, an alkali-activator, an early strength agent, water glass, a water reducer and polypropylene fibre. The desulfurized gypsum in the foam concrete is uncalcined desulfurized gypsum; by using the foam concrete, the desulfurized gypsum can be recycled, a great number of industrial wastes such as slag powder and coal ash can be digested, and a favorable environmental benefit is achieved. In addition, the foam concrete provided by the invention has the excellent performances such as light weight, heat insulation, noise isolation and absorption, flame retardance, seismic resistance and energy adsorption, can be used for casting in situ and producing blocks and plates and is suitable for casting a roof heat insulating layer, a floor heating heat insulating layer, a light wall heat insulating building block, a road absorbent lined barrier and the like in situ.
Description
Technical field
The invention belongs to building material technical field, being specifically related to a kind of is the foamed concrete and preparation method thereof of main gelling material with desulfurated plaster.
Background technology
Along with the development of process of industrialization and the significantly raising of social productive forces, Nonrenewable resources such as tellurian fossil oil are day by day bought and are exhausted, and the mankind are being faced with serious energy dilemma.Nowadays, save energy becomes social theme with cutting down the consumption of energy.All the time, in the energy consumption ratio of various countries, building energy consumption occupies very high proportion.Therefore, develop high-efficiency insulated novel wall material, realize the self-heat conserving of construction wall, to reduce building energy consumption with reach energy-conservation require significant.In recent years; China's construction wall lagging material commonly used mainly is some organic insulation materials; Like polystyrene block, spraying polyurethane, extruded polystyrene board and granular polystyrene etc.; But these organic materialss exist significant disadvantage: 1) the material deformation coefficient is big, and deformation, poor stability in use very easily take place; 2) material can be aging gradually after using for some time, and the life-span is shorter, poor durability; 3) material very easily burns, and security is not high.
Big fire of Beijing CCTV and Shanghai incidents such as " 11.15 " fire disaster in 2010 have exposed the shortcoming of organic insulation material fire line difference, let people re-recognize the importance of wall heat insulation material fire resistance.At present, organic insulation materials such as styrofoam have withdrawed from the building materials market, and good and flame retardant resistance begins by force to be used widely and the mineral-type lagging material is because of its fire line.Foamed concrete is as a kind of inorganic heat insulation material, remarkable advantage such as not only have light weight, heat insulating, sound insulation sound absorption and do not fire, and can also utilize trade wastes such as flyash and slag in a large number in process of production.Current, it is just produced and uses with swift and violent speed.
Foamed concrete is the foam that foaming agent solution is processed through mechanical means; Join in finish mix such as material (cement, flyash, slag powders, lime and silica sand etc.), admixture, fiber and the water slurry of siliceous and calcium, through mixing a kind of light porous material of construction that stirring, casting and maintenance form.It has many similar characteristics with gas concrete, and, mechanical property identical like constitutional features and technical indicator are close etc.But; With respect to gas concrete; Foamed concrete has the advantage of following several respects: 1) gas concrete is through the chemical process foaming; The aperture is wayward, and foamed concrete can be controlled pore opening through adjusting whipping agent and suds-stabilizing agent ratio and change churning time and speed through the physical method foaming; 2) foamed concrete more is prone to realize low density, and existing at present R&D institution develops dry density and is lower than 150Kg/m
3The foamed concrete product; 3) maintenance method is more various, and foamed concrete can be taked modes such as natural curing, vapor cure and steam press maintenance, and traditional gas concrete only adopts steam press maintenance; 4) foamed concrete both can be used for cast-in-placely, also can be used to produce bulk and sheet material, and gas concrete can only be produced bulk and sheet material.
Desulfurated plaster is claimed desulfurized gesso of flue gas (Flue Gas Desulphurization Gypsum) again, is the flue gas that sulfurous fuels (coal, wet goods) burning back produces is carried out that desulfurizing and purifying is handled and the industry by-product gypsum that obtains.The Eleventh Five-Year Plan end, there is hundred million kilowatts of coal fired power generation machines of 3-4 configuration set desulfurization method of limestone-gypsum facility in China, annual generation desulfurated plaster more than 6,000 ten thousand tons, during " 12 ", its output still will increase rapidly every year.The desulfurated plaster that quantity discharged is increased severely year by year if taking to abandon stores up, not only takies the land resources of a large amount of preciousnesses, and ecotope is on every side had a negative impact.The topmost application approach of current desulfurated plaster is divided into two kinds: a kind of is to replace the plaster of paris as the retardant of silicate cement and the additive of composite blend etc. without the incinerating desulfurated plaster; A kind of is to be used to produce plaster of Paris or to be brushing gypsum and plastering of main raw material etc. with the plaster of Paris through the incinerating desulfurated plaster.
Preformed foam is mixed desulfurated plaster-slag powders-flyash-cementitious composite gelling system be prepared into foamed concrete; Not only be not merely desulfurated plaster a feasible recycling approach is provided; Also mass consumption trade waste such as flyash and slag; And prepare a kind of novel building thermal insulation material, promote the development of building energy conservation.
The foamed concrete of the present invention preparation with desulfurated plaster, flyash, slag and ordinary Portland cement as gelling material; And admixture alkali-activator and hardening accelerator carry out modification to gelling material; Preformed foam with gelling material and suds-stabilizing agent modification stirs again, and obtaining after moulding and the maintenance with desulfurated plaster is the foamed concrete of main gelling material, and it both can be used for cast-in-place; Also can be used for article of manufacture; Product light weight, heat-insulating property excellence and fire line are good, meet the requirement of architectural exterior-protecting construction wall thermal insulating, have good economic benefit, environmental benefit and social benefit.
Summary of the invention
The object of the present invention is to provide that a kind of light weight, heat-insulating property are excellent, fire line reach well the trade waste utilization ratio high be the foamed concrete of main gelling material with desulfurated plaster.
The present invention proposes a kind of is the foamed concrete of main gelling material with desulfurated plaster; This foamed concrete with desulfurated plaster, flyash, slag powders and ordinary Portland cement as composite gelled material; And admixture alkali-activator and hardening accelerator carry out modification to gelling material; Preformed foam is that whipping agent makes through mechanical means, and with suds-stabilizing agent to its modification.What the present invention proposed is the foamed concrete of main gelling material with desulfurated plaster; Be made up of desulfurated plaster, slag powders, flyash, cement, whipping agent, suds-stabilizing agent, alkali-activator, hardening accelerator, water glass, water reducer and polypropylene fibre, the weight ratio of each component is:
Desulfurated plaster 100
Slag powders 60-130
Flyash 2-10
Cement 5-30
Whipping agent 0.2-0.9
Suds-stabilizing agent 0.05-0.4
Alkali-activator 1-10
Hardening accelerator 0.5-8
Water glass 1-5
Water reducer 0.05-1.5
Polypropylene fibre 0.25-3
The preferable weight ratio of each component is:
Desulfurated plaster 100
Slag powders 80-120
Flyash 3-8
Cement 10-25
Whipping agent 0.3-0.8
Suds-stabilizing agent 0.1-0.35
Alkali-activator 3-9
Hardening accelerator 2-6
Water glass 2-4
Water reducer 0.07-1.3
Polypropylene fibre 0.4-2.5.
Among the present invention, said slag powders is a kind of in S95 slag powders or the S75 slag powders.
Among the present invention, said flyash is a kind of in II level high-calcium fly ass or the III level high-calcium fly ass.
Among the present invention, said cement is a kind of in 42.5 ordinary Portland cements or 52.5 ordinary Portland cements.
Among the present invention, said whipping agent is a kind of in tea saponin or the rosined soap class whipping agent.
Among the present invention, said suds-stabilizing agent is a kind of in lauroyl diethanolamine or the oleic acid.
Among the present invention, said alkali-activator is NaOH or KOH and Na
2SO
4Mix with 1:2 (weight ratio).
Among the present invention, said hardening accelerator is CaCl
2Or NaCl's is a kind of.
Among the present invention, the modulus of said water glass is 3 or 4, and concentration is 30%-40% (weight percentage).
Among the present invention, said water reducer is a kind of in poly carboxylic acid series water reducer or the naphthalene water reducer.
Among the present invention, said polypropylene fibre is the chopped strand of 5-20mm length.
What the present invention proposed is the preparation method of the foamed concrete of main gelling material with desulfurated plaster, and concrete steps are following:
(1) take by weighing each component by aforementioned each part by weight, whipping agent and suds-stabilizing agent are dissolved in water, wherein water consumption is 250 times (weight ratios) of whipping agent, again with carrying out compressed air foam in whipping agent and the suds-stabilizing agent solution adding air compressor machine.
(2) desulfurated plaster, slag powders, flyash, cement, alkali-activator, hardening accelerator, water glass, water reducer and polypropylene fibre are added foamed concrete with in the stirrer; Add water again and stir into even slurry, wherein water consumption is the 50%-65% of desulfurated plaster, slag powders, flyash and cement total mass.
(3) foam prefabricated in the step (1) is added in the slurry that stirs in the step (2), restir evenly gets final product.
What the present invention proposed is that the foamed concrete of main gelling material both can be used for cast-in-placely also can being used for article of manufacture with desulfurated plaster.
Among the present invention, desulfurated plaster is as main bonding component, and slag powders, flyash and cement are as auxiliary bonding component, and forming with desulfurated plaster jointly is the plural gel system of main gelling material.The slag powders composition is similar with cement clinker, wherein SiO
2, CaO and Al
2O
3Total content reaches 90% approximately, and is active higher, the strength development that hydrated calcium silicate gel that its aquation generates and drated calcium aluminate gel can promote system.Mainly contain a large amount of active silicas and aluminum oxide in the fine coal ash composition.Adopt slag powders and the compound admixture of flyash, give full play to both activity, can both play very big effect the early strength and the later strength of whole system.Cement itself is exactly gelling material; The admixture little cement can not only promote the development of compound system intensity, and can also play excitation; The calcium hydroxide that it generates in hydration process; Can promote the growth of another kind of hydrated product ettringite, thereby accelerate the aquation process of desulfurated plaster, obviously increase the early strength of system.
The early activity of main activated slag powder of alkali-activator and flyash, the development that improves its early strength.Admixture hardening accelerator mainly is the early strength that improves the plural gel system, shortens its time of coagulation.Water glass not only can improve the denseness of slurry, also can promote the development of early strength.The adding of water reducer can reduce the system water consumption, improves its rheological and plasticity-, and its intensity is improved, and reduces and shrinks, prolongs life.Suds-stabilizing agent mainly is a performance of improving whipping agent, makes foamy longer steady time.Polypropylene fibre can improve folding strength, reduces and shrinks, and prevents cracking.
The present invention is for being the foamed concrete of main gelling material with desulfurated plaster, has excellent properties such as light weight, heat insulating, sound insulation sound absorption, fire-retardant and antidetonation, and utilized trade waste largely, has environmental benefit and economic benefit significantly.
The present invention can be used for roofing cast-in-place thermal-insulating layer, cast-in-place floor heating thermal insulation layer, wall heat insulation building blocks, the soundproof wall of public places of entertainment such as the absorbent lined barrier of road and KTV etc., and it is of many uses, and is functional.
Embodiment
Further specify the present invention through embodiment below.
Embodiment 1, and a kind of is the foamed concrete of main gelling material with desulfurated plaster, presses desulfurated plaster 100, S95 slag powders 60; Flyash 2, cement 5, whipping agent 0.2; Suds-stabilizing agent 0.05, alkali-activator 1, hardening accelerator 0.5; Water glass 1, water reducer 0.05, the weight ratio of polypropylene fibre 0.25 is formulated.Wherein whipping agent is dissolved in the water that is equivalent to 250 times of its weight.The water consumption of preparation slip is 50% of desulfurated plaster, slag powders, flyash and a cement gross weight.The 3d folding strength and the ultimate compression strength of this foamed concrete are respectively 0.31MPa and 2.60MPa, and 28d folding strength and ultimate compression strength are respectively 0.75MPa and 4.32MPa, and dry density is 664Kg/m
3, thermal conductivity is 0.15W/ (m.K).
Embodiment 2, and a kind of is the foamed concrete of main gelling material with desulfurated plaster, presses desulfurated plaster 100, S75 slag powders 100; Flyash 5, cement 15, whipping agent 0.5; Suds-stabilizing agent 0.1, alkali-activator 4, hardening accelerator 4; Water glass 2, water reducer 0.1, the weight ratio of polypropylene fibre 0.25 is formulated.Wherein whipping agent is dissolved in the water that is equivalent to 250 times of its weight.The water consumption of preparation slip is 50% of desulfurated plaster, slag powders, flyash and a cement gross weight.The 3d folding strength and the ultimate compression strength of this foamed concrete are respectively 0.29MPa and 2.55MPa, and 28d folding strength and ultimate compression strength are respectively 0.73MPa and 3.99MPa, and dry density is 597 Kg/m
3, thermal conductivity is 0.11 W/ (m.K).
Embodiment 3, and a kind of is the foamed concrete of main gelling material with desulfurated plaster, presses desulfurated plaster 100, S75 slag powders 120; Flyash 7, cement 20, whipping agent 0.7; Suds-stabilizing agent 0.2, alkali-activator 7, hardening accelerator 6; Water glass 4, water reducer 1.0, the weight ratio of polypropylene fibre 1.5 is formulated.Wherein whipping agent is dissolved in the water that is equivalent to 250 times of its weight.The water consumption of preparation slip is 60% of desulfurated plaster, slag powders, flyash and a cement gross weight.The 3d folding strength and the ultimate compression strength of this foamed concrete are respectively 0.13MPa and 1.64MPa, and 28d folding strength and ultimate compression strength are respectively 0.25MPa and 2.11MPa, and dry density is 546 Kg/m
3, thermal conductivity is 0.09 W/ (m.K).
Embodiment 4, and a kind of is the foamed concrete of main gelling material with desulfurated plaster, presses desulfurated plaster 100, S95 slag powders 130; Flyash 10, cement 30, whipping agent 0.9; Suds-stabilizing agent 0.4, alkali-activator 10, hardening accelerator 8; Water glass 5, water reducer 1.5, the weight ratio of polypropylene fibre 3 is formulated.Wherein whipping agent is dissolved in the water that is equivalent to 250 times of its weight.The water consumption of preparation slip is 65% of desulfurated plaster, slag powders, flyash and a cement gross weight.The 3d folding strength and the ultimate compression strength of this foamed concrete are respectively 0.30MPa and 2.57MPa, and 28d folding strength and ultimate compression strength are respectively 0.73MPa and 4.14MPa, and dry density is 641 Kg/m
3, thermal conductivity is 0.13 W/ (m.K).
Claims (10)
1. one kind is the foamed concrete of main gelling material with desulfurated plaster; It is characterized in that this foamed concrete is made up of desulfurated plaster, slag powders, flyash, cement, whipping agent, suds-stabilizing agent, alkali-activator, hardening accelerator, water glass, water reducer and polypropylene fibre, the weight ratio of each component is:
Desulfurated plaster 100
Slag powders 60-130
Flyash 2-10
Cement 5-30
Whipping agent 0.2-0.9
Suds-stabilizing agent 0.05-0.4
Alkali-activator 1-10
Hardening accelerator 0.5-8
Water glass 1-5
Water reducer 0.05-1.5
Polypropylene fibre 0.25-3.
2. according to claim 1 is the foamed concrete of main gelling material with desulfurated plaster, it is characterized in that the weight ratio of each component is:
Desulfurated plaster 100
Slag powders 80-120
Flyash 3-8
Cement 10-25
Whipping agent 0.3-0.8
Suds-stabilizing agent 0.1-0.35
Alkali-activator 3-9
Hardening accelerator 2-6
Water glass 2-4
Water reducer 0.07-1.3
Polypropylene fibre 0.4-2.5.
3. according to claim 1 is the foamed concrete of main gelling material with desulfurated plaster; It is characterized in that said slag powders adopts a kind of in S95 slag powders or the S75 slag powders; Said cement is a kind of in 42.5 ordinary Portland cements or 52.5 ordinary Portland cements, and said flyash is a kind of in II level high-calcium fly ass or the III level high-calcium fly ass.
4. according to claim 1 is the foamed concrete of main gelling material with desulfurated plaster, it is characterized in that said whipping agent is a kind of in tea saponin or the rosined soap class whipping agent, and said suds-stabilizing agent is a kind of in lauroyl diethanolamine or the oleic acid.
5. according to claim 1 is the foamed concrete of main gelling material with desulfurated plaster, it is characterized in that said alkali-activator is NaOH or KOH and Na
2SO
4Weight ratio with 1:2 mixes.
6. according to claim 1 is the foamed concrete of main gelling material with desulfurated plaster, it is characterized in that said hardening accelerator is CaCl
2Or a kind of among the NaCl.
7. according to claim 1 is the foamed concrete of main gelling material with desulfurated plaster, and the modulus that it is characterized in that said water glass is 3 or 4, and concentration is 30%-40%.
8. according to claim 1 is the foamed concrete of main gelling material with desulfurated plaster, it is characterized in that said water reducer is a kind of in poly carboxylic acid series water reducer or the naphthalene water reducer.
9. according to claim 1 is the foamed concrete of main gelling material with desulfurated plaster, it is characterized in that said polypropylene fibre is the chopped strand of 5-20mm length.
One kind as claimed in claim 1 be the preparation method of the foamed concrete of main gelling material with desulfurated plaster, it is characterized in that concrete steps are following:
(1) take by weighing each component by each part by weight, whipping agent and suds-stabilizing agent are dissolved in water, wherein water consumption is heavy 250 times of whipping agent, whipping agent and suds-stabilizing agent solution is added in the air compressor machine carry out compressed air foam again;
(2) desulfurated plaster, slag powders, flyash, cement, alkali-activator, hardening accelerator, water glass, water reducer and polypropylene fibre are added foamed concrete with in the stirrer; Add water again and stir into even slurry, wherein water consumption is the 50wt%-65wt% of desulfurated plaster, slag powders, flyash and cement total mass;
(3) foam prefabricated in the step (1) is added in the slurry that stirs in the step (2), restir evenly gets final product.
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| CN 201210126903 CN102633525B (en) | 2012-04-27 | 2012-04-27 | Foam concrete with desulfurized gypsum as main cementing material and preparation method of foam concrete |
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