CN107352887B - Shrinkage-compensating foam concrete for light composite partition board - Google Patents
Shrinkage-compensating foam concrete for light composite partition board Download PDFInfo
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- CN107352887B CN107352887B CN201710712908.9A CN201710712908A CN107352887B CN 107352887 B CN107352887 B CN 107352887B CN 201710712908 A CN201710712908 A CN 201710712908A CN 107352887 B CN107352887 B CN 107352887B
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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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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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
- 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
Abstract
The invention discloses shrinkage-compensating foam concrete for a light composite partition board, which comprises the following raw materials in parts by weight: 150-250 parts of cement, 50-100 parts of fluidized bed fly ash, 2-4 parts of a composite activator, 10-15 parts of a foaming agent, 1.5-3.5 parts of polyester fiber, 1.5-2.5 parts of a water reducing agent and 1-3 parts of a thickening agent. The foam concrete has the characteristic of shrinkage compensation, and the prepared light composite partition board has high hardness, the foam concrete layer is not easy to collapse, the composite panel is not easy to fall off, and the foam concrete is energy-saving and environment-friendly.
Description
Technical Field
The invention belongs to the field of wall materials, and particularly relates to a novel wall material of a light composite partition board.
Background
The foam concrete and the panel are made into the sandwich composite board, so that the wallboard has good light weight and heat insulation performance, the overall mechanical performance of the composite wall material is improved, and the requirements of users are met. The sandwich composite board is used as a composite material, and materials of each phase have similar volume change characteristics, such as drying shrinkage performance. For cement-based materials, the mechanism of drying is related to the internal porosity of the cement slurry. The foam concrete has a large dry shrinkage value, and mainly comes from a large amount of water-filled capillary pores and gel pores inside C-S-H gel in cement slurry. The dry shrinkage values of the calcium silicate board and the cement fiber board are smaller because the content of C-S-H gel in the products is less, the main products are tobermorite and xonotlite crystals, and unreacted quartz powder, and the influence of the products on drying shrinkage is smaller.
The preparation process of the light foam concrete wallboard requires that foam concrete is poured between two side panels to prepare a composite board, and the whole composite board is maintained. The large difference in shrinkage between the foam concrete and the panel results in compressive stresses within the panel and tensile stresses within the foam concrete. The mechanical property of the foam concrete is not high, and if the internal tensile stress is greater than the ultimate tensile stress of the foam concrete, cracks can be generated in the foam concrete, even through cracks are formed, so that the panel falls off, and the product quality is affected.
In order to improve the expansion performance of the foam concrete, the common method is to add an expanding agent, but the strength is reduced, the cost is increased, and the expanding agent needs to be calcined at high temperature, so that the energy consumption is high; in addition, the components and the proportion of the raw materials of the expanding agent are fixed, and the expanding agent cannot be reasonably and flexibly prepared according to the engineering requirements.
At present, the discharge amount of fly ash of a circulating fluidized bed in China is about 0.8-1.5 hundred million t per year, but compared with the common fly ash, the boiler has the characteristics of high SO3 content and free CaO content, high expansion rate, low early strength and the like due to different combustion conditions of the boiler and the common fly ash, and the solid waste utilization of the circulating vulcanized fly ash is urgent from the viewpoint of environmental protection.
According to the invention, the expansion characteristic of the circulating vulcanized fly ash is utilized to prepare the shrinkage-compensating foam concrete, the drying shrinkage difference between the foam concrete and a panel layer is reduced, the activity of the circulating vulcanized fly ash is excited by adopting a chemical excitation method, the strength of the foam concrete is improved, and the composite wall material with excellent performance is further prepared.
Disclosure of Invention
The invention aims to provide energy-saving and environment-friendly type compensation shrinkage foam concrete aiming at the defects of the prior art and improve the quality of a light composite clapboard.
The technical scheme adopted by the invention is as follows: an energy-saving environment-friendly shrinkage-compensating foam concrete for a light composite partition board comprises the following raw materials in parts by weight: 150-250 parts of cement, 50-100 parts of fluidized bed fly ash, 2-4 parts of a composite activator, 10-15 parts of a foaming agent, 1.5-3.5 parts of polyester fiber, 1.5-2.5 parts of a water reducing agent and 1-3 parts of a thickening agent.
The invention fully utilizes the expansion characteristic of the fluidized bed fly ash to improve the shrinkage rate of the concrete, and adopts a chemical excitation method to excite the activity of the fluidized bed fly ash, the modified fluidized bed fly ash is properly combined with other raw materials, and the raw material components interact with each other, so that the prepared foam concrete has high strength and is not easy to shrink when being dried. In addition, during production, the foam concrete with good compensation shrinkage characteristic can be prepared by adopting the conventional method according to the raw material composition of the invention, no additional expanding agent is needed, no complex procedures such as high-temperature calcination and the like are needed, and the labor intensity and the production cost are greatly reduced. In addition, the light composite partition board prepared by the concrete has high hardness, the foam concrete layer of the light composite partition board is not suitable for a mould collapse, the composite panel is not easy to fall off, and the light composite partition board is durable, energy-saving and environment-friendly.
Preferably, the foam concrete comprises the following raw materials in parts by weight: 200-225 parts of cement, 70-80 parts of fluidized bed fly ash, 2.5-3.5 parts of composite activator, 12-15 parts of foaming agent, 2-3 parts of polyester fiber, 1.5-2.0 parts of water reducing agent and 1.5-2.5 parts of thickening agent.
Preferably, the foam concrete comprises the following raw materials in parts by weight: 225 parts of cement, 75 parts of fluidized bed fly ash, 3.5 parts of composite exciting agent, 12 parts of foaming agent, 2 parts of polyester fiber, 2 parts of water reducing agent and 2 parts of thickening agent.
Preferably, the fluidized bed fly ash is desulfurized fly ash obtained by spraying calcium in a furnace, and the screen residue of a square-hole sieve with the fineness of 0.045mm is 5-12%. The fineness of the desulfurized fly ash directly influences the performance of the concrete, and if the fineness is too large, the concrete is slowly hydrated and the strength is influenced.
The composite exciting agent is a chemical exciting agent and can be used for exciting the activity of the fluidized bed fly ash, preferably, the main components of the composite exciting agent are sodium silicate and calcium sulfate, and the molar mass ratio of the sodium silicate to the calcium sulfate is 2: 1-4: 1. the activator is prepared by compounding sodium silicate and calcium sulfate according to a reasonable proportion, can more effectively promote the secondary hydration reaction of the fluidized bed fly ash cement compared with the common activator, form more flocculated C-S-H gel, improve the structural density of a hydration product and improve the strength of foam concrete.
Preferably, the length of the polyester fiber is 30-50 mm, and the breaking strength is 2-6 cN/dtex.
Preferably, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content of the water reducing agent is more than 20 wt%, and the water reducing rate is 27%.
When the mixing amount is lower, the viscosity of the cement mixture is increased, the cohesiveness is correspondingly improved, and the segregation resistance of the concrete is effectively improved. Preferably, the thickening agent is one or more of hydroxypropyl methyl cellulose ether, welan gum and methyl cellulose ether.
Preferably, the cement is a portland cement having a strength rating of 42.5.
The light composite partition board prepared by the concrete has the characteristics of high strength, impact resistance, durability and the like.
Compared with the prior art, the invention has the advantages and beneficial effects that: 1. the invention fully utilizes the characteristics of high content of fluidized bed fly ash SO3 and CaO, high expansion rate and low strength, utilizes circulating fluidized bed fly ash in a harmless and recycling manner, properly combines with other raw materials, and makes interaction among the raw material components to prepare the shrinkage-compensating foam concrete, thereby effectively reducing the drying shrinkage of the foam concrete and reducing the shrinkage difference between the foam concrete and a panel; 2. the invention adopts sodium silicate and calcium sulfate to prepare the composite excitant according to a reasonable proportion to promote the secondary hydration reaction of the fluidized bed fly ash cement, form more flocculent C-S-H gel, improve the structural density of hydration products, improve the strength of foam concrete and improve the quality of the light composite clapboard; 3. the foam concrete has the characteristic of shrinkage compensation, and the prepared light composite partition board has high hardness, the foam concrete layer is not easy to collapse, the composite panel is not easy to fall off, and the foam concrete is durable, energy-saving and environment-friendly. 4. The invention reasonably utilizes the fluidized bed fly ash, greatly relieves the contradiction of short supply of the common fly ash, is beneficial to the comprehensive utilization of the desulfurized fly ash, effectively saves the use of natural gypsum and quicklime, plays an important role in solving the increasingly serious problem that the desulfurized fly ash pollutes the environment and saving fossil natural resources, and has obvious economic benefit, environmental benefit and social benefit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present inventors have found that the performance of the foamed concrete of the present invention is not greatly affected by each preparation method, and therefore, only one preparation method is exemplified in the following examples, and the preparation method is not further limited to the examples of the present invention.
Example 1
A shrinkage-compensating foam concrete for light composite partition boards: 225g of cement, 75g of fluidized bed fly ash, 2g of polyester fiber, 2.4g of sodium silicate, 1.1g of calcium sulfate, 2g of water reducing agent, 2g of hydroxypropyl methyl cellulose ether and 95g of water are added into a stirrer and uniformly stirred to form cement paste, and then 12g of foaming agent is mixed according to the proportion of 1: 20, diluting, preparing foam by a foaming agent through a foaming machine, adding the prepared foam into the stirred cement paste, and mixing the foam to prepare the foam concrete slurry. The fluidized bed fly ash is desulfurized ash obtained by spraying calcium in a furnace, and the screen residue of a square-hole sieve with the fineness of 0.045mm is 5%. The length of the polyester fiber is 40mm, and the breaking strength is 5 cN/dtex. The water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content of the water reducing agent is 30 wt%, and the water reducing rate is 27%.
Example 2
Adding 250g of cement, 80g of fluidized bed fly ash, 2.2g of polyester fiber, 3.2g of sodium silicate, 0.8g of calcium sulfate, 105g of water, 2.3g of water reducing agent and 1.8g of welan gum into a stirrer, uniformly stirring to form cement paste, and then adding 15g of foaming agent into the stirrer according to the proportion of 1: 20, diluting, preparing foam by a foaming agent through a foaming machine, adding the prepared foam into the stirred cement paste, and mixing the foam to prepare the foam concrete slurry. The fluidized bed fly ash is desulfurized ash obtained by spraying calcium in a furnace, and the screen residue of a square-hole sieve with the fineness of 0.045mm is 9%. The length of the polyester fiber is 50mm, and the breaking strength is 2 cN/dtex. The water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content of the water reducing agent is 25 wt%, and the water reducing rate is 27%.
Example 3
160g of cement, 50g of fluidized bed fly ash, 1.5g of polyester fiber, 3g of sodium silicate, 1g of calcium sulfate, 85g of water, 1.5g of water reducing agent and 1g of methyl cellulose ether are added into a stirrer and uniformly stirred to form cement paste, and then 10g of foaming agent is mixed according to the proportion of 1: 20, diluting, preparing foam by a foaming agent through a foaming machine, adding the prepared foam into the stirred cement paste, and mixing the foam to prepare the foam concrete slurry. The fluidized bed fly ash is desulfurized ash obtained by spraying calcium in a furnace, and the screen residue of a square-hole sieve with the fineness of 0.045mm is 12%. The length of the polyester fiber is 30mm, and the breaking strength is 3 cN/dtex. The water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content of the water reducing agent is 28 wt%, and the water reducing rate is 27%.
Example 4
A shrinkage-compensating foam concrete for light composite partition boards: adding 200g of cement, 100g of fluidized bed fly ash, 3.5g of polyester fiber, 2g of sodium silicate, 1g of calcium sulfate, 2g of water reducing agent, 3g of hydroxypropyl methyl cellulose ether and 110g of water into a stirrer, uniformly stirring to form cement paste, and then adding 13g of foaming agent into the stirrer according to the proportion of 1: 20, diluting, preparing foam by a foaming agent through a foaming machine, adding the prepared foam into the stirred cement paste, and mixing the foam to prepare the foam concrete slurry. The fluidized bed fly ash is desulfurized ash obtained by spraying calcium in a furnace, and the screen residue of a square-hole sieve with the fineness of 0.045mm is 10%. The length of the polyester fiber is 35mm, and the breaking strength is 4 cN/dtex. The water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content of the water reducing agent is 35 wt%, and the water reducing rate is 27%.
Example 5
A shrinkage-compensating foam concrete for light composite partition boards: adding 180g of cement, 65g of fluidized bed fly ash, 3.0g of polyester fiber, 2.4g of sodium silicate, 0.8g of calcium sulfate, 1.8g of water reducing agent, 2.5g of hydroxypropyl methyl cellulose ether and 102g of water into a stirrer, uniformly stirring to form cement paste, and then adding 12g of foaming agent according to the weight ratio of 1: 20, diluting, preparing foam by a foaming agent through a foaming machine, adding the prepared foam into the stirred cement paste, and mixing the foam to prepare the foam concrete slurry. The fluidized bed fly ash is desulfurized ash obtained by spraying calcium in a furnace, and the screen residue of a square-hole sieve with the fineness of 0.045mm is 10%. The length of the polyester fiber is 40mm, and the breaking strength is 5 cN/dtex. The water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content of the water reducing agent is 35 wt%, and the water reducing rate is 27%.
Comparative example 1
The comparative example is basically the same as example 1, except that the comparative example does not use fluidized bed fly ash and a composite exciting agent, uses the same weight of cement to replace the composite exciting agent, and uses the same weight of common fly ash to replace the fluidized bed fly ash, namely the foamed concrete of the comparative example is prepared by 228.5g of cement, 75g of common fly ash, 12g of foaming agent, 2g of polyester fiber, 2g of water reducing agent, 2g of hydroxypropyl methyl cellulose ether and 95g of water.
Comparative example 2
This comparative example is essentially the same as example 1 except that the activators of this comparative example are sodium silicate and do not contain calcium sulfate.
Comparative example 3
This comparative example is essentially the same as example 1 except that the activators of this comparative example are calcium sulfate and do not contain sodium silicate.
The foamed concrete slurries described in examples 1 to 5 and comparative examples 1 to 3 were poured into designated molds, naturally cured for 2 days, and then demolded, and the age strengths and dry shrinkage values of the concretes 3d, 7d, and 28d and the cracking conditions were measured, and the test results are shown in Table 1.
TABLE 1
From the above results, it can be seen that the 28d free shrinkage rate of the shrinkage-compensating foam concrete of the present invention is 0.0002% -0.0032%, the shrinkage rate is extremely low, the compressive strength reaches 7.8MPa, and no crack phenomenon occurs, and the engineering requirements can be satisfied, while the dry shrinkage values of the foam concrete prepared from the common fly ash and the foam concrete prepared from the single activator are all larger, and the strength is lower than the standard range. Therefore, the foam concrete prepared by the invention has good shrinkage compensation effect, and the strength of the foam concrete can be effectively improved through the excitation effect of the composite exciting agent. The foam concrete prepared by the invention is used for preparing the light composite partition board, has high hardness, the foam concrete layer is not suitable for a collapse mold, the composite panel is not easy to fall off, and the energy is saved and the environment is protected.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The shrinkage-compensating foam concrete for the light composite partition board is characterized by comprising the following raw materials in parts by weight: 150-250 parts of cement, 50-100 parts of fluidized bed fly ash, 2-4 parts of a composite activator, 10-15 parts of a foaming agent, 1.5-3.5 parts of polyester fiber, 1.5-2.5 parts of a water reducing agent and 1-3 parts of a thickening agent;
the composite exciting agent is sodium silicate and calcium sulfate, and the molar mass ratio of the composite exciting agent to the calcium sulfate is 2: 1-4: 1.
2. the shrinkage-compensating foam concrete for the light composite partition board according to claim 1, which is characterized by comprising the following raw materials in parts by weight: the foam concrete comprises the following raw materials in parts by weight: 200-225 parts of cement, 70-80 parts of fluidized bed fly ash, 2.5-3.5 parts of composite activator, 12-15 parts of foaming agent, 2-3 parts of polyester fiber, 1.5-2.0 parts of water reducing agent and 1.5-2.5 parts of thickening agent.
3. The shrinkage-compensating foam concrete for the light composite partition board according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 225 parts of cement, 75 parts of fluidized bed fly ash, 3.5 parts of composite exciting agent, 12 parts of foaming agent, 2 parts of polyester fiber, 2 parts of water reducing agent and 2 parts of thickening agent.
4. The shrinkage-compensating foam concrete for the light composite partition board as claimed in claim 1, wherein the fluidized bed fly ash is desulfurized ash obtained by spraying calcium into a furnace, and the fineness of the desulfurized ash is 5-12% of the screen residue of a square-hole screen with the fineness of 0.045 mm.
5. The shrinkage-compensating foam concrete for a lightweight composite partition board according to claim 1, wherein: the polyester fiber has a length of 30 to 50mm and a breaking strength of 2 to 6 cN/dtex.
6. The shrinkage-compensating foam concrete for a lightweight composite partition board according to claim 1, wherein: the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content of the water reducing agent is more than 20 wt%, and the water reducing rate is 27%.
7. The shrinkage-compensating foam concrete for a lightweight composite partition board according to claim 1, wherein: the thickening agent is one or more of hydroxypropyl methyl cellulose ether, welan gum and methyl cellulose ether.
8. A lightweight composite partition panel made from the concrete of any one of claims 1 to 7.
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| CN108947566A (en) * | 2018-10-08 | 2018-12-07 | 天津市新军盛大混凝土有限公司 | A kind of lower shrinkage low viscosity high-strength concrete |
| CN109467372B (en) * | 2018-12-14 | 2021-04-06 | 中北大学 | Sulphoaluminate cement foaming insulation board and preparation method thereof, and assembled integrated insulation wall and preparation method thereof |
| CN111548084A (en) * | 2020-04-13 | 2020-08-18 | 上海二十冶建设有限公司 | Jet reinforced high-ductility concrete and preparation method thereof |
| CN114105535B (en) * | 2021-11-26 | 2023-04-07 | 武汉钢铁有限公司 | Method for preparing light energy-saving wall material by sintering desulfurized ash through high-doping semidry method |
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Effective date of registration: 20210407 Address after: 430000 Chuanlong Avenue, Zhonghua community, Hengdian street, Huangpi District, Wuhan City, Hubei Province Patentee after: Hubei LianJian New Material Co.,Ltd. Address before: Room 07, 2nd floor, unit 2, block C, building 6, contemporary international garden headquarters base, No.2, Guanshan Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430000 Patentee before: WUHAN YOUCHENG TECHNOLOGY Co.,Ltd. |