Method for preparing brick-concrete wall thermal insulation material of northeast old community by using blast furnace slag
By using thermal insulation materials prepared by blast furnace slag and other raw materials, the problem of insufficient insulation performance of brick-concrete walls in old communities in Northeast China is solved, and the resource utilization of industrial solid waste and good insulation effect are achieved, thereby reducing building energy consumption.
Patent Information
- Application Number
- CN202510031018.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-04-15
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The brick-concrete walls in old communities in Northeast China have obvious shortcomings in thermal insulation performance, resulting in rapid indoor heat loss and high energy consumption.
By using blast furnace slag as the main raw material, combining fly ash and cement, and after pretreatment, mixing ingredients, adding admixtures and water, forming and maintenance, insulation materials suitable for brick-concrete walls in old communities in Northeast China are prepared.
The resource utilization of industrial solid waste is realized, environmental pollution is reduced, and the prepared insulation materials have good insulation performance, and the thermal conductivity can be controlled at 0.05-0.1W/(m·K), which effectively reduces the heat transfer of brick-concrete walls in old communities, reduces indoor and outdoor temperature differences, and reduces building energy consumption.
Smart Images
Figure CN119822731A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of wall insulation material preparation, and specifically to a method for preparing brick-concrete wall insulation materials for old residential areas in Northeast China by utilizing blast furnace slag. Background Art
[0002] Insulation materials are generally materials with small heat coefficients. Insulation materials are developing rapidly. The use of good insulation technology and materials in industry and construction can often achieve twice the result with half the effort. For the insulation of industrial equipment and pipelines, aerogels are first used in the thermal insulation lining of space suits developed by NASA. The thermal insulation lining has the characteristics of low thermal conductivity, low density, high flexibility, fireproof and waterproof. Its normal temperature thermal conductivity is 0.018W / (K·m) and it is absolutely waterproof. Its thermal insulation performance is 3 to 8 times that of traditional materials. Insulation materials can collect excess heat and release it smoothly and timely. The gradient change is small, which effectively reduces the loss. The room temperature can be tended and the winter insulation can play a balancing role. In the decoration of new buildings and the renovation of old buildings, it overcomes the inherent deficiencies such as wall cracks, condensation, mildew, and peeling; and it is safely and reliably bonded to the base as a whole, with good randomness and no cavity, to avoid tearing and falling off under negative wind pressure. It effectively overcomes the problems of side ribs after the board is spliced, and the deformation of the outer corner bricks falls off. The organic matter in the material reacts with the free acid in the main wall base to form a compound, which penetrates into the micropores of the main wall to form a community, ensuring dry adhesion and improving the wet adhesion value retention rate, with excellent adhesion. Raw materials such as floating beads and brucite fibers (tubular fibers) are selected, and a closed hydrophobic microporous cavity structure is formed in its structure, which is used as a phase change material carrier to ensure the long-term practicality of the phase change material.
[0003] The climate in Northeast China is cold in winter, and the brick-concrete walls in old residential areas have obvious deficiencies in thermal insulation performance, resulting in rapid indoor heat loss and high energy consumption. Blast furnace slag is a large byproduct of the steel production process, and its effective utilization has always been a research hotspot in the field of industrial solid waste treatment. Developing blast furnace slag into brick-concrete wall insulation material can not only solve the problems of slag stacking and environmental pollution, but also improve the living comfort and energy saving effect of old residential areas. Summary of the invention
[0004] 1. Technical issues to be resolved
[0005] In view of the shortcomings of the prior art, the present invention provides a method for preparing brick-concrete wall insulation materials for old residential areas in Northeast China using blast furnace slag. The present invention uses blast furnace slag as the main raw material, realizes the resource utilization of industrial solid waste, reduces pollution to the environment, and meets the requirements of sustainable development.
[0006] (II) Technical solution
[0007] To achieve the above purpose, the present invention is implemented by the following technical scheme: a method for preparing a brick-concrete wall insulation material for an old residential area in Northeast China using blast furnace slag, which specifically includes the following steps:
[0008] S1. Raw material pretreatment: collect blast furnace slag, crush it into particles, and then perform magnetic separation to remove residual metallic iron impurities, and select appropriate amounts of fly ash and cement as auxiliary raw materials;
[0009] S2, mixing ingredients: according to the mass ratio, put 60-70 parts of the treated blast furnace slag, 20-30 parts of fly ash, and 10-20 parts of cement into a mixer for dry mixing at a stirring speed of 150-200 rpm for 10-15 minutes to ensure that the raw materials are evenly mixed;
[0010] S3, adding admixtures and water: add an appropriate amount of admixtures to the uniformly mixed dry materials, the admixtures include water reducers, foaming agents and foam stabilizers, slowly add water, control the water-cement ratio at 0.4-0.6, and stir at a speed of 200-250 rpm for 5-8 minutes to form a uniform slurry;
[0011] S4. Molding and curing: Inject the prepared slurry into a specific mold. The shape and size of the mold are designed according to the requirements of the brick-concrete wall insulation layer of the old residential area. It can be made into blocks or plates. The molded specimens are left to stand at room temperature for 2-3 hours, and then placed in a curing room for curing. The curing temperature is controlled at 20-25°C, the humidity is maintained at 80-90%, and the curing time is 28 days.
[0012] Preferably, the water reducing agent in step S2 is a naphthalene-based water reducing agent, and the added amount thereof is 0.5-1% of the total raw material mass.
[0013] Preferably, in step S2, the foaming agent is an animal foaming agent, and the addition amount thereof is 3-5 parts.
[0014] Preferably, in step S2, the foam stabilizer is calcium stearate, and the addition amount thereof is 1-2 parts.
[0015] Preferably, the cement in step S1 is ordinary Portland cement.
[0016] Preferably, the fly ash in step S1 needs to pass through a 80-100 mesh sieve.
[0017] Preferably, in step S1, the furnace slag is crushed into particles with a particle size of 5-20 mm.
[0018] (III) Beneficial effects
[0019] The present invention provides a method for preparing brick-concrete wall insulation materials for old residential areas in Northeast China using blast furnace slag. Compared with the prior art, it has the following beneficial effects:
[0020] (1) The method of using blast furnace slag to prepare thermal insulation materials for brick-concrete walls in old residential areas in Northeast China realizes the resource utilization of industrial solid waste and reduces pollution to the environment by using blast furnace slag as the main raw material. It meets the requirements of sustainable development. The prepared thermal insulation material has good thermal insulation performance, and its thermal conductivity can be controlled at 0.05-0.1W / (m·K). It can effectively reduce the heat transfer of brick-concrete walls in old residential areas, reduce the temperature difference between indoors and outdoors, and reduce building energy consumption.
[0021] (2) The method of using blast furnace slag to prepare brick-concrete wall insulation materials for old residential areas in Northeast China has good adhesion to the brick-concrete wall, is easy to construct, can be directly pasted or applied to the wall surface, and is suitable for energy-saving renovation projects in old residential areas. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 The present invention is a flow chart of the preparation method. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0024] See also Figure 1 The embodiment of the present invention provides three technical solutions: a method for preparing brick-concrete wall insulation material for old residential areas in Northeast China using blast furnace slag, which specifically includes the following embodiments:
[0025] Example 1: A method for preparing a brick-concrete wall insulation material for an old residential area in Northeast China using blast furnace slag, specifically comprising the following steps:
[0026] S1. Raw material pretreatment: blast furnace slag is collected, crushed into particles, and then subjected to magnetic separation and iron removal treatment to remove the residual metallic iron impurities therein, and appropriate amounts of fly ash and cement are selected as auxiliary raw materials. Cement uses ordinary Portland cement, fly ash needs to pass through a 90-mesh sieve, and blast furnace slag is crushed into particles with a particle size of 10 mm;
[0027] S2, mixed ingredients: according to mass ratio, 65 parts of blast furnace slag after treatment, 25 parts of fly ash and 15 parts of cement are put into a mixer and dry mixed, the stirring speed is 170 rev / min, and the stirring time is 13 minutes to ensure that the raw materials are evenly mixed. The water reducer adopts naphthalene series water reducer, and its addition amount is 0.7% of the total raw material mass. In step S2, the foaming agent is selected from animal foaming agent, and its addition amount is 4 parts. In step S2, the foam stabilizer adopts calcium stearate, and its addition amount is 1.5 parts;
[0028] S3, adding admixtures and water: add an appropriate amount of admixtures to the uniformly mixed dry materials, the admixtures including water reducer, foaming agent and foam stabilizer, slowly add water, control the water-cement ratio at 0.5, and stir at a speed of 230 rpm for 7 minutes to form a uniform slurry;
[0029] S4. Molding and curing: Inject the prepared slurry into a specific mold. The shape and size of the mold are designed according to the requirements of the brick-concrete wall insulation layer of the old residential area. It can be made into blocks or plates. The molded specimens are left to stand at room temperature for 2.5 hours and then placed in a curing room for curing. The curing temperature is controlled at 23°C and the humidity is maintained at 85%. The curing time is 28 days.
[0030] Example 2: A method for preparing a brick-concrete wall insulation material for an old residential area in Northeast China using blast furnace slag, specifically comprising the following steps:
[0031] S1. Raw material pretreatment: blast furnace slag is collected, crushed into particles, and then subjected to magnetic separation and iron removal treatment to remove the residual metallic iron impurities therein, and appropriate amounts of fly ash and cement are selected as auxiliary raw materials. Cement uses ordinary Portland cement, fly ash needs to pass through an 80-mesh sieve, and blast furnace slag is crushed into particles with a particle size of 5 mm;
[0032] S2, mixed ingredients: according to mass ratio, 60 parts of blast furnace slag after treatment, 20 parts of fly ash, and 10 parts of cement are put into a mixer for dry mixing, and the stirring speed is 150 rev / min, and the stirring time is 10 minutes to ensure that the raw materials are evenly mixed. The water reducer adopts naphthalene series water reducer, and its addition amount is 0.5% of the total raw material mass. In step S2, the foaming agent is selected from animal foaming agent, and its addition amount is 3 parts. In step S2, the foam stabilizer adopts calcium stearate, and its addition amount is 1 part;
[0033] S3, adding admixtures and water: add an appropriate amount of admixtures to the uniformly mixed dry materials, the admixtures including water reducer, foaming agent and foam stabilizer, slowly add water, control the water-cement ratio at 0.4, and stir at a speed of 200 rpm for 5 minutes to form a uniform slurry;
[0034] S4. Molding and curing: Inject the prepared slurry into a specific mold. The shape and size of the mold are designed according to the requirements of the brick-concrete wall insulation layer of the old residential area. It can be made into blocks or plates. The molded specimens are left to stand at room temperature for 2 hours and then placed in a curing room for curing. The curing temperature is controlled at 20°C and the humidity is maintained at 80%. The curing time is 28 days.
[0035] Example 3: A method for preparing a brick-concrete wall insulation material for an old residential area in Northeast China using blast furnace slag, specifically comprising the following steps:
[0036] S1. Raw material pretreatment: blast furnace slag is collected, crushed into particles, and then subjected to magnetic separation and iron removal treatment to remove the residual metallic iron impurities therein, and appropriate amounts of fly ash and cement are selected as auxiliary raw materials. Ordinary Portland cement is used for cement, and fly ash needs to be sieved through a 100-mesh sieve. The blast furnace slag is crushed into particles with a particle size of 20 mm;
[0037] S2, mixed ingredients: according to mass ratio, 70 parts of blast furnace slag after treatment, 30 parts of fly ash, and 20 parts of cement are put into a mixer for dry mixing, and the stirring speed is 200 rev / min, and the stirring time is 15 minutes to ensure that the raw materials are evenly mixed. The water reducer adopts naphthalene series water reducer, and its addition amount is 1% of the total raw material mass. In step S2, the foaming agent is selected from animal foaming agent, and its addition amount is 5 parts. In step S2, the foam stabilizer adopts calcium stearate, and its addition amount is 2 parts;
[0038] S3, adding admixtures and water: add an appropriate amount of admixtures to the uniformly mixed dry materials, the admixtures including water reducer, foaming agent and foam stabilizer, slowly add water, control the water-cement ratio at 0.6, and stir at 250 rpm for 8 minutes to form a uniform slurry;
[0039] S4. Molding and curing: Inject the prepared slurry into a specific mold. The shape and size of the mold are designed according to the requirements of the brick-concrete wall insulation layer of the old residential area. It can be made into blocks or plates. The molded specimens are left to stand at room temperature for 3 hours and then placed in a curing room for curing. The curing temperature is controlled at 25°C and the humidity is maintained at 90%. The curing time is 28 days.
[0040] Application test:
[0041] Method 1: Blast furnace slag-cement-based insulation material:
[0042] 1. Raw material preparation:
[0043] Blast furnace slag: Select blast furnace slag that has been screened and pretreated to ensure that its particle size meets the requirements. Generally, slag particles with a particle size of about 0.1-2mm can be sieved.
[0044] Cement: Ordinary Portland cement, grade 42.5. The mass ratio of cement to blast furnace slag can be initially set at about 1:3.
[0045] Additives: You can add appropriate amount of water reducing agent (such as naphthalene water reducing agent) and foaming agent (such as animal protein foaming agent). The amount of water reducing agent is 0.5%-1% of the cement mass, and the amount of foaming agent is adjusted according to the target porosity. For example, to achieve a porosity of 30%-50%, the amount of foaming agent may be 3%-5% of the cement mass.
[0046] 2. Mixing and stirring: Pour blast furnace slag, cement and water reducing agent into the mixer, dry mix for 3-5 minutes to mix the components evenly. Then add water, control the water-cement ratio to about 0.4-0.6, and continue to stir for 5-10 minutes to form a uniform slurry. Finally, add the foaming agent and stir for 1-2 minutes to evenly distribute the foaming agent in the slurry, and then the slurry will gradually expand under the action of the foaming agent.
[0047] 3. Molding and curing: Pour the mixed materials into the pre-made wall insulation material mold. The mold size can be designed according to the actual wall size requirements, for example, a 300mm×300mm×50mm test block. The test block is demoulded after standing at room temperature for 24 hours, and then placed in a standard curing room (temperature 20℃±2℃, relative humidity above 95%) for 28 days. During this period, the appearance and size changes of the test block are regularly observed.
[0048] Method 2: Blast furnace slag-polystyrene particle composite insulation material:
[0049] 1. Raw material preparation:
[0050] Blast furnace slag: The treated blast furnace slag powder is ground into fine powder by ball milling to make its specific surface area reach 300-500m 2 / kg.
[0051] Polystyrene particles: Expanded polystyrene particles with a particle size of 3-5 mm can be selected, and the volume accounts for 30%-40% of the total volume of the insulation material.
[0052] Binder: polymer emulsion (such as styrene acrylic emulsion) is used as a binder, and the amount used is 20%-30% of the mass of blast furnace slag.
[0053] Fiber material: Add a small amount (such as 1%-2% of the total mass) of glass fiber or polypropylene fiber to enhance the material's crack resistance.
[0054] 2. Mixing: First, put the blast furnace slag powder, binder and fiber material into a mixer and stir for 5-8 minutes to form a uniform gelling material. Then slowly add the polystyrene particles and stir for 3-5 minutes to ensure that the polystyrene particles are fully wrapped by the gelling material to avoid agglomeration of the polystyrene particles.
[0055] 3. Molding and curing: Put the mixed materials into the mold, and use the layered compaction method to control the thickness of each layer to 20-30mm to make the materials evenly distributed in the mold. Naturally cure at room temperature for 2-3 days, and then dry at 50℃-60℃ for 24-48 hours to fully cure the materials and form wall insulation materials with certain strength and thermal insulation performance.
[0056] Method 3: Blast furnace slag-inorganic thermal insulation fiber composite insulation material:
[0057] 1. Material preparation:
[0058] Blast furnace slag: Blast furnace slag that has been calcined at high temperature has better activity and a particle size of about 0.5-1mm.
[0059] Inorganic thermal insulation fiber: It can be rock wool fiber or aluminum silicate fiber, with a fiber length of 3-5 mm and a fiber content of 10%-20% of the total mass.
[0060] Binder: Water glass (sodium silicate solution) is used as the binder with a modulus of 2.6-3.0. The amount of the binder is 15%-20% of the mass of the blast furnace slag.
[0061] Additives: Add an appropriate amount of curing agent (such as sodium fluorosilicate), the amount of which is 3%-5% of the mass of water glass, to promote the curing of the adhesive.
[0062] 2. Preparation process: Put blast furnace slag and inorganic thermal insulation fiber into a mixing device and dry mix for 3-5 minutes to evenly disperse the fiber in the slag. Then mix the water glass binder and curing agent evenly, add them to the above mixture, and stir for another 5-10 minutes to form a plastic blank. Put the blank into a mold and form it into a wall insulation material block by extrusion or vibration. The formed material is placed in a natural environment for 7-10 days to allow the binder to fully solidify, and the finished insulation material can be obtained.
[0063] During the experiment, the performance of the insulation material prepared by each method is tested, including thermal conductivity test (using the heat flow meter method, etc.), compressive strength test (universal material testing machine), water absorption test, etc., to evaluate whether it meets the requirements for brick-concrete wall insulation in old communities in Northeast China.
[0064] In summary, the present invention realizes the resource utilization of industrial solid waste and reduces pollution to the environment by utilizing blast furnace slag as the main raw material, which meets the requirements of sustainable development. The prepared thermal insulation material has good thermal insulation performance, and its thermal conductivity can be controlled at 0.05-0.1W / (m·K), which can effectively reduce the heat transfer of brick-concrete walls in old residential areas, reduce the temperature difference between indoors and outdoors, and reduce building energy consumption. The thermal insulation material has good adhesion to brick-concrete walls, is easy to construct, can be directly pasted or applied to the wall surface, and is suitable for energy-saving renovation projects in old residential areas.
[0065] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0066] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A method for preparing brick-concrete wall insulation materials for old residential areas in Northeast China using blast furnace slag, characterized in that: The specific steps include: S1. Raw material pretreatment: collect blast furnace slag, crush it into particles, and then perform magnetic separation to remove residual metallic iron impurities, and select appropriate amounts of fly ash and cement as auxiliary raw materials; S2, mixing ingredients: according to the mass ratio, put 60-70 parts of the treated blast furnace slag, 20-30 parts of fly ash, and 10-20 parts of cement into a mixer for dry mixing at a stirring speed of 150-200 rpm for 10-15 minutes to ensure that the raw materials are evenly mixed; S3, adding admixtures and water: add an appropriate amount of admixtures to the uniformly mixed dry materials, the admixtures include water reducers, foaming agents and foam stabilizers, slowly add water, control the water-cement ratio at 0.4-0.6, and stir at a speed of 200-250 rpm for 5-8 minutes to form a uniform slurry; S4. Molding and curing: Inject the prepared slurry into a specific mold. The shape and size of the mold are designed according to the requirements of the brick-concrete wall insulation layer of the old residential area. It can be made into blocks or plates. The molded specimens are left to stand at room temperature for 2-3 hours, and then placed in a curing room for curing. The curing temperature is controlled at 20-25°C, the humidity is maintained at 80-90%, and the curing time is 28 days.
2. The method for preparing thermal insulation materials for brick-concrete walls of old residential areas in Northeast China using blast furnace slag according to claim 1, characterized in that: In step S2, the water reducing agent is a naphthalene-based water reducing agent, and the addition amount thereof is 0.5-1% of the total raw material mass.
3. The method for preparing thermal insulation materials for brick-concrete walls of old residential areas in Northeast China using blast furnace slag according to claim 1, characterized in that: In step S2, the foaming agent is an animal foaming agent, and the addition amount thereof is 3-5 parts.
4. The method for preparing thermal insulation materials for brick-concrete walls of old residential areas in Northeast China using blast furnace slag according to claim 1, characterized in that: In step S2, the foam stabilizer is calcium stearate, and the addition amount thereof is 1-2 parts.
5. The method for preparing thermal insulation materials for brick-concrete walls of old residential areas in Northeast China using blast furnace slag according to claim 1, characterized in that: In step S1, ordinary Portland cement is used as cement.
6. The method for preparing thermal insulation materials for brick-concrete walls of old residential areas in Northeast China using blast furnace slag according to claim 1, characterized in that: In step S1, the fly ash needs to pass through a 80-100 mesh sieve.
7. The method for preparing thermal insulation materials for brick-concrete walls of old residential areas in Northeast China using blast furnace slag according to claim 1, characterized in that: In the step S1, the furnace slag is crushed into particles with a particle size of 5-20 mm.