Sound insulation mortar and preparation method thereof

Abstract

The invention discloses sound insulation mortar and a preparation method thereof. The sound insulation mortar is prepared from walnut shell powder, Portland cement, sulphoaluminate cement, an active component, inert filler, inorganic salt, a water reducing agent, a water retaining agent, lightweight aggregate, aggregate, polyvinyl alcohol and polypropylene fiber. According to the mortar disclosed by the invention, the walnut shell powder is added to replace part of cement, so that the prepared mortar has a good sound insulation effect, and the consumption of the cement is reduced, so that the carbon emission is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of mortar, and more specifically, relates to a sound insulation mortar and a preparation method thereof. Background Art

[0002] As urban construction projects develop towards high quality and people's quality of life continues to improve, people's needs are not only reflected in material aspects, but also pay more attention to the comfort of the living environment; in particular, noise pollution has become a major public hazard that affects the quiet life of residents. In the face of noise pollution, it has also attracted the attention of relevant functional and scientific research departments.

[0003] Sound insulation mortar is usually a typical porous sound-absorbing structure with a large number of micropores that penetrate each other from the surface to the inside, and has a certain air permeability. The sound insulation material should reduce the transmitted sound energy and block the propagation of sound and impact sound. In the mortar industry, sound insulation mortar has become a research hotspot. Summary of the invention

[0004] The purpose of the present invention is to provide a sound insulation mortar and a preparation method thereof. The present invention adds walnut shell powder to replace part of the cement, so that the prepared mortar has good sound insulation effect and reduces the amount of cement, thereby reducing carbon emissions.

[0005] In order to achieve the above-mentioned purpose, one aspect of the present invention provides a sound insulation mortar, which includes: walnut shell powder, silicate cement, sulphoaluminate cement, active components, inert fillers, inorganic salts, water reducing agents, water retaining agents, lightweight aggregates, aggregates, polyvinyl alcohol and polypropylene fibers.

[0006] According to the present invention, preferably, the sound insulation mortar comprises, by weight: 10-50 parts of walnut shell powder, 200-250 parts of silicate cement, 45-55 parts of sulphoaluminate cement, 48-52 parts of active components, 48-52 parts of inert fillers, 1-5 parts of inorganic salts, 1-3 parts of water reducing agents, 3-4 parts of water retaining agents, 195-205 parts of lightweight aggregates, 350-400 parts of aggregates, 1-4 parts of polyvinyl alcohol and 1-2 parts of polypropylene fibers.

[0007] In the present invention, walnut shell powder is used as an emission reduction material, and renewable waste is used to replace cement, thereby reducing carbon emissions while ensuring mechanical properties. Walnut shell powder itself has the characteristic of large specific surface area, and is added to mortar products to form a porous sound-absorbing structure, improve the spatial structure, and enhance sound insulation performance.

[0008] According to the present invention, preferably, the particle size of the walnut shell powder is 5-10 μm.

[0009] According to the present invention, preferably, the active component is silica fume and / or slag.

[0010] In the present invention, the slag is ground slag with a particle size of 15-20 μm.

[0011] In the present invention, the chemical composition of silica fume includes: SiO2≥90%, H2O 1%-1.5%, ignition loss 2%-3%, other substances ≤1%, density 230kg / m 3 about.

[0012] According to the present invention, preferably, the inorganic salt is at least one of iron sulfate, magnesium sulfate and zinc chloride.

[0013] According to the present invention, preferably, the inert filler is stone powder and / or heavy calcium powder.

[0014] According to the present invention, preferably, the water reducer is a polycarboxylate water reducer and / or a naphthalene water reducer;

[0015] The lightweight aggregate is expanded perlite and / or rubber powder.

[0016] In the present invention, the pH value of the water reducing agent is 7-10, the bulk density is 500-600, and the water reduction rate is 25%-35%.

[0017] In the present invention, the expanded perlite includes: SiO2 (70%-80%), Al2O3 (10%-15%), K2O+Na2O (6%-9%), CaO+MgO (0.8%-1.2%); preferably, closed-cell expanded perlite is used.

[0018] According to the present invention, preferably, the water retaining agent is hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether, and the mass ratio of the hydroxypropyl methyl cellulose ether to the hydroxyethyl methyl cellulose ether is (2-3):1.

[0019] In the present invention, the water retaining agent is a mixture of HPMC and HEMC, and the viscosity range is 40000-60000 mPa·s.

[0020] According to the present invention, preferably, the aggregate is lightweight sand;

[0021] The silicate cement is preferably P042.5 silicate cement.

[0022] In the present invention, the components of P042.5 silicate cement include: CaO 60%-65%, SiO2 15%-20%, Al2O3 4%-5%, Fe2O3 2%-3%, MgO 2%-3%, SO3 3%-4%; calcination vector ≤3%, NaOequi ≤1%.

[0023] The components of sulphoaluminate cement include: Al2O3 65%-75%, SiO2 0.5%-1.5%, Fe2O30.5%-1%, MgO 1%-2%, alkali content Na2O+0.65K2O≤0.4, S≤0.1, CL≤0.1.

[0024] Another aspect of the present invention provides a method for preparing the above-mentioned sound insulation mortar, the preparation method comprising:

[0025] (1) uniformly mixing the walnut shell powder, inorganic salt, inert filler and water reducing agent;

[0026] (2) The silicate cement, sulphoaluminate cement, active component, water retaining agent, aggregate, polyvinyl alcohol and polypropylene fiber are mixed evenly, and then mixed evenly with the mixed material obtained in step (1), and finally the lightweight aggregate is added and mixed evenly to obtain the sound insulation mortar.

[0027] In the present invention, walnut shell powder, inorganic salt, inert filler and water reducing agent are premixed, so that the walnut shell powder can be dispersed more evenly in the mortar, thereby avoiding the adverse effects of the walnut shell powder being mixed into cement due to uneven dispersion.

[0028] In the present invention, preferably, during construction, the sound insulation mortar is poured into a cement mortar mixer, and stirred while adding water. The consistency of the sound insulation mortar is controlled between 80mm and 100mm, and construction can be carried out after reaching the consistency standard.

[0029] The technical solution of the present invention has the following beneficial effects: the mortar of the present invention, by adding walnut shell powder to replace part of the cement, makes the prepared mortar have good sound insulation effect, reduces the amount of cement, and thus reduces carbon emissions.

[0030] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0032] The present invention is further described below by examples:

[0033] In the following embodiments and comparative examples:

[0034] The particle size of the walnut shell powder used is 5-10 μm;

[0035] Polyvinyl alcohol was purchased from Sinopec Great Wall Company, brand 2488;

[0036] The average length of the polypropylene fibers was 6 mm.

[0037] Example 1

[0038] The present embodiment provides a sound insulation mortar, which includes, by weight: 10 parts of walnut shell powder, 240 parts of P042.5 silicate cement, 50 parts of sulphoaluminate cement, 50 parts of silica fume, 50 parts of stone powder, 3 parts of ferric sulfate, 2 parts of polycarboxylate water reducer, 4 parts of water retaining agent, 200 parts of expanded perlite, 390 parts of lightweight sand, 2 parts of polyvinyl alcohol and 2 parts of polypropylene fiber; wherein the water retaining agent is hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether, and the mass ratio of the hydroxypropyl methyl cellulose ether to the hydroxyethyl methyl cellulose ether is 3:1.

[0039] The specific preparation method is as follows: (1) uniformly mixing the walnut shell powder, ferric sulfate, stone powder and polycarboxylate water reducer;

[0040] (2) The silicate cement, sulphoaluminate cement, silica fume, hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether, light sand, polyvinyl alcohol and polypropylene fiber are mixed evenly, and then mixed evenly with the mixed material obtained in step (1), and finally the expanded perlite is added and mixed evenly to obtain the sound insulation mortar.

[0041] Example 2

[0042] The present embodiment provides a sound insulation mortar, which includes, by weight: 20 parts of walnut shell powder, 230 parts of P042.5 silicate cement, 50 parts of sulphoaluminate cement, 50 parts of silica fume, 50 parts of stone powder, 3 parts of ferric sulfate, 3 parts of polycarboxylate water reducer, 4 parts of water retaining agent, 200 parts of expanded perlite, 390 parts of lightweight sand, 3 parts of polyvinyl alcohol and 1 part of polypropylene fiber; wherein the water retaining agent is hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether, and the mass ratio of the hydroxypropyl methyl cellulose ether to the hydroxyethyl methyl cellulose ether is 3:1.

[0043] The specific preparation method is the same as that in Example 1.

[0044] Example 3

[0045] The present embodiment provides a sound insulation mortar, which includes, by weight: 30 parts of walnut shell powder, 220 parts of P042.5 silicate cement, 50 parts of sulphoaluminate cement, 50 parts of silica fume, 50 parts of stone powder, 3 parts of ferric sulfate, 3 parts of polycarboxylate water reducer, 4 parts of water retaining agent, 200 parts of expanded perlite, 390 parts of lightweight sand, 3 parts of polyvinyl alcohol and 1 part of polypropylene fiber; wherein the water retaining agent is hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether, and the mass ratio of the hydroxypropyl methyl cellulose ether to the hydroxyethyl methyl cellulose ether is 3:1.

[0046] The specific preparation method is the same as that in Example 1.

[0047] Example 4

[0048] The present embodiment provides a sound insulation mortar, which includes, by weight: 40 parts of walnut shell powder, 210 parts of P042.5 silicate cement, 50 parts of sulphoaluminate cement, 50 parts of silica fume, 50 parts of stone powder, 3 parts of ferric sulfate, 3 parts of polycarboxylate water reducer, 4 parts of water retaining agent, 200 parts of expanded perlite, 390 parts of lightweight sand, 3 parts of polyvinyl alcohol and 1 part of polypropylene fiber; wherein the water retaining agent is hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether, and the mass ratio of the hydroxypropyl methyl cellulose ether to the hydroxyethyl methyl cellulose ether is 3:1.

[0049] The specific preparation method is the same as that in Example 1.

[0050] Example 5

[0051] The present embodiment provides a sound insulation mortar, which includes, by weight, 50 parts of walnut shell powder, 200 parts of P042.5 silicate cement, 50 parts of sulphoaluminate cement, 50 parts of silica fume, 50 parts of stone powder, 3 parts of ferric sulfate, 3 parts of polycarboxylate water reducer, 4 parts of water retaining agent, 200 parts of expanded perlite, 390 parts of lightweight sand, 4 parts of polyvinyl alcohol and 1 part of polypropylene fiber; wherein the water retaining agent is hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether, and the mass ratio of the hydroxypropyl methyl cellulose ether to the hydroxyethyl methyl cellulose ether is 3:1.

[0052] The specific preparation method is the same as that in Example 1.

[0053] Comparative Example 1

[0054] This comparative example provides a mortar, which includes, by weight: 200 parts of P042.5 silicate cement, 50 parts of sulphoaluminate cement, 50 parts of silica fume, 50 parts of stone powder, 3 parts of ferric sulfate, 3 parts of polycarboxylate water reducer, 4 parts of water retaining agent, 200 parts of expanded perlite, 390 parts of lightweight sand, 4 parts of polyvinyl alcohol and 1 part of polypropylene fiber; wherein the water retaining agent is hydroxypropyl methylcellulose ether and hydroxyethyl methylcellulose ether, and the mass ratio of the hydroxypropyl methylcellulose ether to the hydroxyethyl methylcellulose ether is 3:1.

[0055] The specific preparation method is as follows:

[0056] (1) Mix ferric sulfate, stone powder and polycarboxylate water reducer evenly;

[0057] (2) The silicate cement, sulphoaluminate cement, silica fume, hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether, light sand, polyvinyl alcohol and polypropylene fiber are mixed evenly, and then mixed evenly with the mixed material obtained in step (1), and finally the expanded perlite is added and mixed evenly to obtain mortar.

[0058] Test Case

[0059] The mortars prepared in the above embodiments and comparative examples were subjected to performance tests. The specific test data are shown in the following table, and the specific test methods are as follows.

[0060] 1. Dry density

[0061] The test was carried out in accordance with the provisions of "Expanded Vitrified Microsphere Thermal Insulation Mortar" (GB / T26000-2010). The test specimen mold was 70.7mm×70.7mm×70.7mm, cured in a standard curing room until the first 3 days of the test age, and dried in a constant temperature drying oven at 105℃ to constant weight. When the age was reached, it was taken out, weighed and the specimen size was measured. The dry density ρ=M / V(kg / m3).

[0062] 2. Compressive strength

[0063] The compressive strength is measured in accordance with the "Test Methods for Inorganic Rigid Insulation Products" (GB / T5486-2008), including 7d, 14d, and 28d compressive strength. The compressive strength specimen size is 70.7mm×70.7mm×70.7mm. After curing in a standard curing room until the first 3d of the test age, the specimen is taken out and dried in a constant temperature drying oven at 105°C to constant weight. When the age is reached, it is taken out, cooled to room temperature, and placed on a constant stress pressure testing machine (China Wuxi Jianyi Instrument Machinery Co., Ltd.; TYE-300D cement mortar compression testing machine) for testing. Compressive strength (MPa) = failure load (N) / compressive area of ​​the specimen (m2).

[0064] Table 1 Dry density of the test pieces obtained from the sound insulation mortar of the embodiments and comparative examples (kg / m 3 )

[0065] project 7d dry density 14d dry density 28d dry density Example 1 865 851 836 Example 2 836 814 801 Example 3 763 751 735 Example 4 755 743 726 Example 5 739 731 711 Comparative Example 871 862 849

[0066] It can be seen from the above table that the dry density of the embodiments of the present invention is lower than that of the comparative example, and the dry density of embodiments 1-5 shows a decreasing trend, that is, the addition of walnut shell powder forms an internal porous structure, thereby improving the sound absorption effect and increasing the sound insulation.

[0067] Table 2 Compressive strength of the test pieces obtained from the sound insulation mortar of the embodiment and the comparative example (MPa)

[0068]

[0069]

[0070] The waste walnut shell powder in the present invention can improve the dispersibility of the slurry, achieve uniform surrounding of the expanded perlite, and is beneficial to firmly combine the components, thereby improving the mechanical performance. It can be seen from the above table that the compressive strength of the embodiments of the present invention is significantly improved compared with the comparative examples.

[0071] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A sound insulation mortar, characterized in that: The sound insulation mortar comprises: walnut shell powder, silicate cement, sulphoaluminate cement, active components, inert filler, inorganic salt, water reducing agent, water retaining agent, lightweight aggregate, aggregate, polyvinyl alcohol and polypropylene fiber.

2. The sound insulation mortar according to claim 1, wherein: Measured in parts by mass, the sound insulation mortar includes: 10-50 parts of walnut shell powder, 200-250 parts of silicate cement, 45-55 parts of sulphoaluminate cement, 48-52 parts of active components, 48-52 parts of inert fillers, 1-5 parts of inorganic salts, 1-3 parts of water reducing agents, 3-4 parts of water retaining agents, 195-205 parts of lightweight aggregates, 350-400 parts of aggregates, 1-4 parts of polyvinyl alcohol and 1-2 parts of polypropylene fibers.

3. The sound insulation mortar according to claim 1 or 2, wherein: The particle size of the walnut shell powder is 5-10 μm.

4. The sound insulation mortar according to claim 1 or 2, wherein: The active component is silica fume and / or slag.

5. The sound insulation mortar according to claim 1 or 2, wherein: The inorganic salt is at least one of ferric sulfate, magnesium sulfate and zinc chloride.

6. The sound insulation mortar according to claim 1 or 2, wherein: The inert filler is stone powder and / or heavy calcium powder.

7. The sound insulation mortar according to claim 1 or 2, wherein: The water reducer is a polycarboxylate water reducer and / or a naphthalene water reducer; The lightweight aggregate is expanded perlite and / or rubber powder.

8. The sound insulation mortar according to claim 1 or 2, wherein: The water retaining agent is hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether, and the mass ratio of the hydroxypropyl methyl cellulose ether to the hydroxyethyl methyl cellulose ether is (2-3):

1.

9. The sound insulation mortar according to claim 1 or 2, wherein: The aggregate is light sand; The silicate cement is preferably P042.5 silicate cement.

10. The method for preparing the sound insulation mortar according to any one of claims 1 to 9, characterized in that: The preparation method comprises: (1) uniformly mixing the walnut shell powder, inorganic salt, inert filler and water reducing agent; (2) The silicate cement, sulphoaluminate cement, active component, water retaining agent, aggregate, polyvinyl alcohol and polypropylene fiber are mixed evenly, and then mixed evenly with the mixed material obtained in step (1), and finally the lightweight aggregate is added and mixed evenly to obtain the sound insulation mortar.

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