CN107365128B - Waste silk reinforced fiber cement board and preparation method thereof - Google Patents
Waste silk reinforced fiber cement board and preparation method thereof Download PDFInfo
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- CN107365128B CN107365128B CN201710605718.7A CN201710605718A CN107365128B CN 107365128 B CN107365128 B CN 107365128B CN 201710605718 A CN201710605718 A CN 201710605718A CN 107365128 B CN107365128 B CN 107365128B
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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
- C04B28/06—Aluminous cements
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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
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to waste silk reinforced fiber cement boards and a preparation method thereof, wherein the cement boards are prepared from the following components, by weight, 800-900 parts of cement, 150-200 parts of mineral admixture, 1-3 parts of defoaming agent, 8-15 parts of water reducing agent, 10-30 parts of redispersible rubber powder, 400-500 parts of water, 2000-2500 parts of fine aggregate and 3-8 parts of modified waste silk.
Description
Technical Field
The invention belongs to the field of civil engineering materials, and relates to waste silk reinforced fiber cement boards and a preparation method thereof.
Background
The fiber cement board is a board prepared by taking cement as a basic cementing material and various fibers as reinforcing materials through the processes of pulping, forming, curing and the like, and the addition of the fibers obviously improves the crack resistance of the board, so that is widely applied to the fields of industrial boards of inner and outer walls of various buildings, suspended ceilings, curtain wall lining boards, sound absorption barriers, composite wall panels and the like.
Asbestos has good tensile strength, so has been widely used in fiber cement boards, but because asbestos fiber is liable to induce lung diseases such as lung cancer, it is necessary to find more environment-friendly natural fiber materials.
The patent document with the application number of 201410006936.5 discloses high-performance cement soils and a preparation method thereof, wherein is introduced to improve the strength of cement by simultaneously adding nano natural fibers and nano materials into ordinary portland cement, but the cement materials prepared by the documents use ordinary portland cement, the alkalinity of the ordinary portland cement is high, the ordinary portland cement easily corrodes the nano natural fibers in the ordinary portland cement, the strength of the natural fibers in the cement is damaged, particularly the strength of the cement materials at the later stage cannot be guaranteed, more importantly, the documents also emphasize that the natural fibers and the nano materials are mixed to avoid the technical problem that the fibers and the cement soil are easy to generate partial relative displacement, and the natural fibers and the cement soil are not easy to generate partial relative displacement, the natural fibers and the cement soil are not easy to generate, and the nano fibers and the cement materials are not easy to generate partial relative displacement, and the cement materials are not easy to generate a natural fiber composite material, namely the cement material with the surface bonding property of the nano fibers and the natural fibers and the cement soil are not easy to generate partial relative displacement, and the composite material, namely the cement material with the natural fibers and the nano fiber composite material, the natural fiber and the cement soil can not easily generate the composite material, the nano material, the composite material is not easy to generate the relative displacement, the composite material is not easy to generate the relative displacement, the composite material is not easy to generate the relative displacement, the compressive strength of the composite material is not easy to be.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides waste silks which are used as reinforcing materials for preparing the fiber cement board, so that the cracking resistance of the board is enhanced, the reinforcing materials are uniformly dispersed in a matrix, the material still keeps high strength without corrosion, the environment is protected, and the field of recycling of the waste silks is enlarged.
In order to solve the technical problems, the invention adopts the technical scheme that waste silk reinforced fiber cement boards are characterized by being prepared from the following components, by weight, 800-900 parts of cement, 150-200 parts of mineral admixture, 1-3 parts of defoaming agent, 8-15 parts of water reducing agent, 10-30 parts of redispersible rubber powder, 400-500 parts of water, 2000-2500 parts of fine aggregate and 3-8 parts of modified waste silk.
The cement is low-alkalinity sulphoaluminate cement, the strength is not lower than 42.5, the alkalinity pH value is not more than 10.5, and the performance index meets sulphoaluminate cement (GB/T20472-2006).
The cement of the invention is limited because the alkalinity of the traditional portland cement is higher, the pH value of the prepared cement-based product is usually more than or equal to 12.5, and the risk of corroding the waste silk exists; the pH value of the low-alkalinity sulphoaluminate cement is not more than 10.5.
The mineral admixture of the present invention should be a ground slag powder having an activity index greater than S105. The reason for the limitation is that although the mineral admixtures are various, such as fly ash, zeolite powder, slag powder, steel slag powder and the like, the test data shows that the activity of S105-grade mineral powder is higher than that of the mineral admixtures such as fly ash, and the high-activity mineral admixtures are added into sulphoaluminate cement in a proper amount, so that the pore diameter of the cement-based composite material can be obviously optimized, and the later strength is increased. The smaller the loss on ignition is, the less the unburned carbon component in the slag powder adsorbs the components such as the water reducing agent; therefore, the above specifications are all defined to ensure the strength and workability of the material.
The defoaming agent is an organic silicon defoaming agent (such as a P803 defoaming agent produced by Ming Ling chemical products and a YJG-01 defoaming agent produced by Diandah products); the organic silicon defoaming agent is added, so that the foam generation in the cement-based composite material system is effectively controlled according to the characteristic that the sulphoaluminate cement is easy to foam in the stirring process, and the plate is more compact and bright.
The water reducing agent is a low-alkali concrete retarding high-efficiency water reducing agent (such as produced by Jiangsu Subot new materials Co., Ltd.)
The low-alkali concrete retarding high-efficiency water reducing agent is HD-NXD (low-alkali) retarding high-efficiency water reducing agent produced by Beijing Houdrid traffic science and technology Limited company), and has the three reasons of ① reducing the corrosion probability of alkalinity to waste silk, ② sulphoaluminate cement setting and hardening speed being higher and not utilizing the production of products, so that the setting time needs to be delayed, ③ reducing the water-cement ratio and improving the strength.
The redispersible rubber powder (redispersible latex powder) is powdery thermoplastic resin formed by spraying, drying and other treatments on high molecular polymer emulsion, can obviously improve the binding power and crack resistance of hardened cement boards, and improves the impermeability and physical and mechanical properties, and is at least of vinyl acetate-ethylene copolymer and vinyl acetate-vinyl chloride ethylene copolymer, the solid content is more than or equal to 98 percent, and the minimum film forming temperature is 0-5 ℃ (such as Gomes chemical MS-6090N, RE5044 latex powder of Wacker).
The fine aggregate is quartz sand with the particle size of 0.6-2.5 mm. The quartz sand plays a role in supporting a framework in the plate, plays a role in resisting deformation and reducing the manufacturing cost, and the performance index of the quartz sand must meet the relevant regulation of construction sand (GB/T14684-2011). However, the particle size is too coarse to allow the production of a plate, and therefore the above limitation is made.
The modified waste silk is 5mm-8mm long and 10-30 μm in diameter, and is obtained by soaking waste silk in 5% antistatic liquid for 24h and drying in a 60 ℃ oven; this limitation is made because the load is transferred from the cementite matrix to the modified waste silk fibres through shear stresses at the interface, which are related not only to the fibre and matrix properties, but also to the length and diameter of the fibres. Theories and tests show that the fracture energy of the cement-based composite material is remarkably improved along with the improvement of the length-diameter ratio, but if the length is too large, the cement-based composite material is not easy to disperse, and the fracture resistance is reduced; and the waste silk is soaked in antistatic liquid (the antistatic liquid produced in Shanghai Songya chemical industry), mainly for reducing the surface resistance of the waste silk and improving the dispersibility of the waste silk.
The invention also provides a preparation method of the waste silk reinforced fiber cement board, which comprises the following steps: the preparation process comprises the following steps: weighing the raw materials according to the formula proportion, pouring cement, mineral admixture, redispersible rubber powder and fine aggregate into a stirrer, adding water after dry stirring for 15-30s, adding water reducer and defoamer after stirring for 60-90 s, adding modified waste silk after stirring for 60-90 s, pouring into a mould after stirring for 300s, and naturally curing for 3d to obtain the waste silk reinforced fiber cement board.
Compared with the prior art, the invention has the following unique properties and advantages: according to the invention, the waste silk is used for enhancing the sulphoaluminate cement-based composite material for the first time, so that the waste silk reinforced fiber cement board is prepared, the crack resistance of the board is enhanced, the board is more environment-friendly, and the recycling field of the waste silk is expanded; according to the invention, the low-alkali sulphoaluminate cement and the low-alkali concrete retarding superplasticizer are matched with each other for use, so that the corrosion effect of the whole matrix and each component on silk can be reduced, the cement board can always keep higher strength, and each component is uniformly distributed, especially, antistatic liquid is adopted to modify waste silk, so that each component is uniformly distributed; the fiber reinforced cement board is mainly used for walls, wherein the main filler is 'quartz sand', the amount of cementing materials (cement) is large, and the compressive strength of the fiber reinforced cement board is high (10-20 times of that of cement soil).
Detailed Description
The present invention is described in further detail in below by way of examples, but the present invention is not limited to only the following examples.
Example 1
The waste silk reinforced fiber cement board comprises the following raw material components in parts by weight: the modified waste silk cement mortar comprises 820 parts of cement, 180 parts of mineral admixture, 2 parts of defoaming agent, 12 parts of water reducing agent, 18 parts of redispersible rubber powder, 400 parts of water, 1800 parts of fine aggregate and 4 parts of modified waste silk.
The cement is low-alkalinity sulphoaluminate cement, the strength is not lower than 42.5, the alkalinity pH value is not more than 10.5, and the performance index meets sulphoaluminate cement (GB/T20472-2006);
the mineral admixture is ground slag powder with an activity index greater than S105 level;
the defoaming agent is an organic silicon defoaming agent, such as a P803 defoaming agent produced by Ming Ling chemistry or a YJG-01 defoaming agent produced by Diandah dian;
the water reducing agent is a low-alkali concrete retarding high-efficiency water reducing agent, such as produced by Jiangsu Subo New Material Co., Ltd
(low-alkali type) concrete retarding superplasticizer or HD-NXD (low-alkali) retarding superplasticizer manufactured by Beijing Hough traffic science and technology Limited company;
the fine aggregate is quartz sand with the particle size of 1.5-2mm, and the performance index of the fine aggregate meets the relevant regulation of construction sand (GB/T14684-.
The modified waste silk has the length of 6mm-6.5mm and the diameter of 20-25 mu m, and is obtained by soaking the waste silk in antistatic liquid (the antistatic liquid sold in the market, such as HDC-904 sold by Lin' an Chang static science and technology limited in Hangzhou) with the concentration of 5%, and drying in an oven at 60 ℃.
Pouring cement, mineral admixture, redispersible rubber powder and fine aggregate into a stirrer, dry-stirring for 20-25s, adding water, stirring for 80-85s, adding water reducer and defoamer, stirring for 80-85s, adding modified waste silk, stirring for 300s, pouring into a mould, and naturally curing for 3d to obtain the waste silk reinforced fiber cement board.
The finally obtained waste silk reinforced fiber cement board has the 3d compressive strength of 48.3MPa and the 3d flexural strength of 10.2 MPa.
Compared with the common cement board without the waste silk, the 3d compressive strength is improved by 3.0 percent, and the 3d flexural strength is improved by 9.6 percent.
Example 2
The waste silk reinforced fiber cement board comprises the following raw material components in parts by weight: the cement mortar comprises 880 parts of cement, 155 parts of mineral admixture, 3 parts of defoaming agent, 15 parts of water reducing agent, 25 parts of redispersible rubber powder, 405 parts of water, 2100 parts of fine aggregate and 6 parts of waste silk. The specific types and properties of the components are referred to in the examples.
Pouring cement, mineral admixture, redispersible rubber powder and fine aggregate into a stirrer, dry-mixing for 15-30s, adding water, stirring for 60-90 s, adding water reducer and defoamer, stirring for 60-90 s, adding modified waste silk, stirring for 300s, pouring into a mould, and naturally curing for 3d to obtain the waste silk reinforced fiber cement board.
The finally obtained waste silk reinforced fiber cement board has the 3d compressive strength of 50.8MPa and the 3d flexural strength of 11.3 MPa.
Compared with the common cement board without the waste silk, the 3d compressive strength is improved by 3.8 percent, and the 3d flexural strength is improved by 12.7 percent.
Claims (5)
- The waste silk reinforced fiber cement board is characterized by being prepared from the following components, by weight, 800-900 parts of cement, 150-200 parts of mineral admixture, 1-3 parts of defoaming agent, 8-15 parts of water reducing agent, 10-30 parts of redispersible rubber powder, 400-500 parts of water, 2000-2500 parts of fine aggregate and 3-8 parts of modified waste silk;the cement is low-alkalinity sulphoaluminate cement, the strength is not lower than 42.5, the alkalinity pH value is not more than 10.5, and the performance index meets GB/T20472-2006 sulphoaluminate cement;the water reducing agent is a low-alkali concrete retarding high-efficiency water reducing agent;the modified waste silk is 5mm-8mm in length and 10-30 microns in diameter, and is obtained by soaking waste silk in 5% antistatic liquid for 24h and drying in an oven at 60 ℃.
- 2. The waste silk reinforced fiber cement sheet according to claim 1, wherein: the mineral admixture is ground slag powder with an activity index larger than S105 level, and the ignition loss is not more than 3.0%.
- 3. The waste silk reinforced fiber cement sheet according to claim 1, wherein: the defoaming agent is an organic silicon defoaming agent.
- 4. The waste silk reinforced fiber cement sheet according to claim 1, wherein: the fine aggregate is quartz sand with the particle size of 0.6-2.5 mm, and the performance index meets GB/T14684-2011 of construction sand.
- 5. The method for preparing waste silk reinforced fiber cement board according to claim 1, wherein: weighing the raw materials according to the formula proportion, pouring cement, mineral admixture, redispersible rubber powder and fine aggregate into a stirrer, adding water after dry stirring for 15-30s, adding a water reducing agent and a defoaming agent after stirring for 60-90 s, adding modified waste silk after stirring for 60-90 s, pouring into a mould after stirring for 300s, and naturally curing for 3d to obtain the waste silk reinforced fiber cement board.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710605718.7A CN107365128B (en) | 2017-07-24 | 2017-07-24 | Waste silk reinforced fiber cement board and preparation method thereof |
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| CN201710605718.7A CN107365128B (en) | 2017-07-24 | 2017-07-24 | Waste silk reinforced fiber cement board and preparation method thereof |
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| CN107365128B true CN107365128B (en) | 2020-01-31 |
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| CN107935625B (en) * | 2017-12-20 | 2020-01-03 | 重庆交通大学 | Low-alkalinity vegetation form porous concrete |
| CN115093180A (en) * | 2022-07-01 | 2022-09-23 | 中德新亚建筑材料有限公司 | Anti-freezing type non-shrinkage grouting material and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063092A (en) * | 1992-02-21 | 1992-07-29 | 雷新忠 | The manufacture method of light cement board mixed with fiber material |
| CN101891429A (en) * | 2010-06-28 | 2010-11-24 | 上海衡峰氟碳材料有限公司 | Ceramic imitation cement component, ceramic imitation cement product and preparation method thereof |
| CN103833297A (en) * | 2014-01-07 | 2014-06-04 | 清华大学 | High performance cement soil and preparation method thereof |
| CN105152575A (en) * | 2015-09-24 | 2015-12-16 | 滁州京安工贸有限责任公司 | Chloride-free low-alkaline type concrete set retarding superplasticizer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5567554A (en) * | 1978-11-10 | 1980-05-21 | Kobayashi Bolt Kogyo | Glass fiber reinforced concrete |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063092A (en) * | 1992-02-21 | 1992-07-29 | 雷新忠 | The manufacture method of light cement board mixed with fiber material |
| CN101891429A (en) * | 2010-06-28 | 2010-11-24 | 上海衡峰氟碳材料有限公司 | Ceramic imitation cement component, ceramic imitation cement product and preparation method thereof |
| CN103833297A (en) * | 2014-01-07 | 2014-06-04 | 清华大学 | High performance cement soil and preparation method thereof |
| CN105152575A (en) * | 2015-09-24 | 2015-12-16 | 滁州京安工贸有限责任公司 | Chloride-free low-alkaline type concrete set retarding superplasticizer |
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