Colored mortar suitable for roof tiles without spraying paint and construction method

Abstract

The present invention relates to the field of building materials, and discloses a colored mortar and a construction method suitable for roof tiles without spraying paint. The mortar components include: cement, sand, pigment, thickener, water retaining agent, anti-cracking agent, water repellent, water reducing agent, and filler. The construction method is: 1) base treatment; 2) color mortar preparation; 3) spraying construction; 4) maintenance management. Compared with the prior art, the advantages of the present invention are: the selection of high-quality pigments and additives, as well as optimized component ratios and construction processes, ensure the color of the colored mortar is durable and stable; avoid environmental pollution and cost problems caused by traditional spray painting processes, and comply with the concept of green buildings; compared with traditional roller painting, the construction process is simplified, the construction difficulty and cost are reduced, and the construction efficiency is improved; it has excellent hardness, crack resistance and color stability; less whitening and alkali efflux, and high color saturation; it is suitable for the decoration of various types of roof tiles.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a colored mortar suitable for roof tiles without spraying paint and a construction method. Background Art

[0002] Traditional buildings, especially ancient buildings and antique buildings, are mostly decorated with spray paint on their roof tiles to achieve beautiful and uniform colors. However, the spray paint process has problems such as environmental pollution, high cost, and easy fading.

[0003] With the improvement of environmental awareness and the promotion of green building concepts, some colored mortar products have appeared on the market in the fields of antique building construction and ancient building restoration. However, the existing colored mortar is applied by roller, which has a complex construction process and low efficiency, and also has the disadvantage of easy fading. In addition, the characteristics of the mortar itself will also cause whitening and alkali.

[0004] CN108863211A discloses a compound of dry-powder decorative mortar for fair-faced concrete, which is mainly made of cement and fly ash as cementitious materials and colorants. The invention not only reduces the cost and construction difficulty, but also ensures the quality of the project and solves the problem of unstable quality of on-site construction. It has the advantages of good film formation, high strength, crack resistance, oxidation resistance, UV resistance, non-fading, and natural beauty. However, this mortar does not have the function of inhibiting alkali return. Since cement will have the problem of alkali salt precipitation in the later stage, a layer of white frost is formed on the surface of the mortar, which in turn affects the color display of the fair-faced concrete decorative mortar.

[0005] Therefore, it is particularly important to develop a paint-free, long-lasting and stable color mortar material for roof tiles. Summary of the invention

[0006] The purpose of the present invention is to solve the problems mentioned in the background technology, and to provide a colored mortar and construction method suitable for roof tiles without spraying paint, so as to solve the problems of environmental pollution, high cost, easy fading, etc. caused by the spraying paint process in the prior art. The colored mortar of the present invention has the advantages of long-lasting and stable color, environmental protection and energy saving, and simple construction, and is suitable for the decoration of various roof tiles.

[0007] To solve the above technical problems, the technical solution provided by the present invention is: a colored mortar suitable for paint-free roof tiles, comprising the following ingredients in parts by weight: 40 to 60 parts of cement, 20 to 40 parts of sand, 5 to 15 parts of pigment, 0.1 to 0.2 parts of thickener, 0.1 to 0.2 parts of water retaining agent, 0.1 to 0.3 parts of anti-cracking agent, 0.05 to 0.1 parts of water repellent, 0.03 to 0.06 parts of water reducing agent, and 10 to 30 parts of filler.

[0008] As a preferred embodiment, the pigment is a natural mineral pigment or a synthetic inorganic pigment.

[0009] As a preferred solution, the sand material is one of mineral aggregate, quartz sand or crystal stone.

[0010] As a preferred solution, the filler is at least one of heavy calcium powder, fly ash, silica fume or metakaolin.

[0011] A construction method for paint-free colored mortar suitable for roof tiles, specifically comprising the following steps:

[0012] 1) Base treatment: clean the roof tiles, remove oil and dust, and spray primer;

[0013] 2) Preparation of colored mortar: Mix cement, sand, pigment, thickener, water retaining agent, anti-cracking agent, water repellent, water reducing agent and filler evenly, and add water to adjust the consistency;

[0014] 3) Spraying construction: Use a mortar sprayer to evenly spray the prepared colored mortar on the roof tile surface;

[0015] 4) Maintenance management: After the construction is completed, maintenance management measures shall be carried out.

[0016] As a preferred solution, the maintenance and management measures in step 4) include covering and watering maintenance;

[0017] The covering is to cover the surface with straw mats, sawdust, or geotextile within 3 to 12 hours after the mortar is sprayed to prevent excessive evaporation of water and direct sunlight;

[0018] The watering maintenance is to water once every 3 hours during the first three days and nights after mortar spraying, water twice at night, and then water 3 times every day and night.

[0019] Compared with the prior art, the advantages of the present invention are: long-lasting and stable color. By selecting high-quality pigments and admixtures, as well as optimizing the ingredient ratio and construction process, the color of the colored mortar is ensured to be long-lasting and stable; it is environmentally friendly and energy-saving, avoiding the environmental pollution and cost problems caused by the traditional painting process, and conforming to the concept of green building; it is easy to construct. Compared with traditional roller painting, it simplifies the construction process, reduces the construction difficulty and cost, and improves the construction efficiency; the mortar has excellent hardness, crack resistance and color stability; it has less whitening and alkali efflux, and has high color saturation, which improves the visual expression of buildings, especially ancient buildings and antique buildings; it is suitable for the decoration of various roof tiles. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is described clearly and completely below. 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.

[0021] Example 1

[0022] A paint-free colored mortar suitable for roof tiles comprises the following ingredients in parts by weight: 40 parts of cement, 20 parts of mineral aggregate sand, 15 parts of natural mineral pigments, 0.1 parts of hydroxypropyl methylcellulose, 0.1 parts of organosilicon water retaining agent, 0.1 parts of polymer anti-cracking agent, 0.05 parts of organosilicon water repellent, 0.03 parts of melamine water reducing agent and 30 parts of fly ash.

[0023] In this embodiment, the natural mineral pigment can be selected from one or more of cinnabar, ochre, malachite, lapis lazuli, muscovite, and carbon black.

[0024] The mineral aggregate in this embodiment has good physical and chemical stability, which can improve the density and impermeability of the mortar, thereby reducing the penetration of moisture and harmful substances, helping to protect the pigment from erosion, thereby extending the durability of the color; natural mineral pigments have excellent weather resistance and color retention, and can fully protect buildings from erosion and destruction by the natural environment, industrial waste gas and microorganisms; hydroxypropyl methylcellulose, as a thickener, has good water solubility, water retention and thickening effect, which can significantly improve the viscosity of the mortar and improve its construction performance; the silicone water retaining agent separates the water in the mortar through the action of the surfactant Dispersed into tiny particles to form a stable dispersion system, thereby effectively preventing water loss; polymer anti-cracking agent contains high molecular polymer, which can significantly improve the flexibility and crack resistance of mortar; silicone water repellent and melamine water reducer are both anti-efflorescence agents. Silicone water repellent can significantly reduce the water absorption rate of mortar or concrete, improve water penetration resistance, and thus effectively inhibit efflorescence. They usually have excellent water repellency and weather resistance. Melamine water reducer can improve the mechanical properties of mortar or concrete and inhibit the occurrence of efflorescence; fly ash is used as a filler to adjust the performance of mortar and reduce costs.

[0025] Example 2

[0026] A paint-free colored mortar suitable for roof tiles includes the following components by weight: 60 parts of cement, 40 parts of quartz sand, 5 parts of synthetic inorganic pigments, 0.2 parts of starch ether, 0.2 parts of calcium-based water retaining agent, 0.3 parts of fiber anti-cracking agent, 0.1 parts of organic silicon water repellent, 0.06 parts of melamine water reducing agent, and 10 parts of heavy calcium powder. In this embodiment, the synthetic inorganic pigment can be selected from one or more of iron oxide, titanium dioxide, ultramarine pigment, chromium oxide, cadmium oxide, etc.

[0027] In this embodiment, quartz sand can improve the strength and durability of the mortar, and also help to maintain the color stability; synthetic inorganic pigments have good light resistance, heat resistance and chemical resistance, and therefore can also resist fading to a certain extent; starch ethers such as hydroxypropyl starch ether increase the viscosity of the mortar by absorbing moisture and forming a gel structure; calcium-based water-retaining agents such as calcium gluconate, calcium maltobionate, etc., prevent water loss by increasing the internal osmotic pressure of the mortar and maintain the wetness of the mortar; fiber anti-cracking agents can use polypropylene fibers, cellulose fibers, etc., and increase the fiber content in the mortar to improve its anti-cracking performance; the filler is heavy calcium powder, and its function is the same as in Example 1.

[0028] Example 3

[0029] A paint-free colored mortar suitable for roof tiles comprises the following ingredients in parts by weight: 50 parts of cement, 30 parts of crystal stone sand, 10 parts of synthetic inorganic pigments, 0.15 parts of acrylic thickener, 0.15 parts of methyl cellulose, 0.2 parts of expansion agent, 0.08 parts of organic silicon water repellent, 0.05 parts of melamine water reducing agent, 5 parts of silica fume and 15 parts of metakaolin.

[0030] In this embodiment, the synthetic inorganic pigment can be selected from one or more of iron oxide, titanium dioxide, ultramarine, chromium oxide, cadmium oxide and the like.

[0031] In this embodiment, the crystal stone can improve the strength and durability of the mortar, and also help to maintain the color stability; the acrylic thickener provides thickening ability and good stability; in addition to being a thickener supplement, methyl cellulose also has a certain water retention property, which can extend the working time of the mortar; the expansive agent reacts in the mortar to produce an expansion effect, which can fill the tiny gaps in the mortar, thereby improving its density and crack resistance; the filler is a mixture of kaolin and silica fume in a ratio of 3:1, which is used to adjust the performance of the mortar and reduce costs.

[0032] In order to verify the actual effect of the colored mortar and the construction method thereof of the present invention, the following experiment was conducted on the above-mentioned embodiment, and relevant data were recorded. The experiment shows that the mortar spraying thickness is controlled to be 2 mm, and the mortar is cured according to conventional curing conditions, and the color change, hardness change and crack resistance at different time points are recorded, and finally the degree of efflorescence is observed and recorded by naked eyes.

[0033] Table 1 is the performance index of the colored mortar in Example 1

[0034]

[0035]

[0036] Table 1

[0037] Table 2 is the performance index of the colored mortar in Example 2

[0038]

[0039] Table 2

[0040] Table 3 is the performance index of the colored mortar in Example 3

[0041]

[0042] Table 3

[0043] Note: ΔE*ab is the color change value, calculated using the CIELAB color space. The smaller the value, the smaller the color change. The hardness is tested using the indentation method. The crack resistance is evaluated by visual inspection and crack width measurement. The degree of efflorescence is evaluated by visual inspection.

[0044] Through the above three examples analysis:

[0045] Color stability: From the data, it can be seen that the color mortar in Example 3 has a small color change (ΔE*ab<0.5) from the completion of construction to the 28th day of curing, indicating good color stability. Even after a year of simulated aging test, the color change is only 0.6 at most, which is far below the threshold that can be detected by the naked eye.

[0046] Improved hardness: The hardness of the mortar in Example 3 increased significantly with the increase of curing time, from 5.0 MPa after the construction was completed to 25.0 MPa after 28 days of curing, indicating that the mortar has good hardening properties.

[0047] Crack resistance: During the entire curing period, no obvious cracks appeared in the mortar specimens. Even after one year of simulated aging test, only micro cracks appeared, which did not affect the overall appearance and performance.

[0048] Efflorescence degree: The efflorescence degree of the three embodiments is negligible. In particular, in Embodiment 3, no efflorescence or whitening occurs, which does not affect the overall appearance.

[0049] The present invention, when implemented, comprises the following steps:

[0050] 1) Base treatment: Clean the roof tile surface, remove oil and dust, and spray primer. The primer can penetrate and seal the base layer and putty layer well, making it difficult for alkaline substances to penetrate into the coating with water vapor, thereby reducing the fading caused by alkali.

[0051] 2) Preparation of colored mortar: Mix the raw materials evenly and add water to adjust the consistency;

[0052] 3) Spraying construction: Use a mortar sprayer to evenly spray the prepared colored mortar on the roof tile surface, and the spraying thickness is controlled at 2mm;

[0053] 4) Maintenance management: After the construction is completed, maintenance management measures shall be carried out, including covering and watering.

[0054] Covering means covering the surface with straw mats, sawdust or geotextile within 3 to 12 hours after mortar spraying to prevent excessive evaporation of water and direct sunlight.

[0055] Watering maintenance is for the first three days and nights after mortar spraying, watering once every 3 hours during the day, twice at night, and then watering 3 times every day and night.

[0056] The cement of the present invention is preferably white silicate cement, which is convenient for color matching.

[0057] Sand materials include mineral aggregate, quartz sand or crystal stone.

[0058] Thickeners are used to increase the viscosity of mortar, making it more stable and workable.

[0059] Water retaining agent is mainly used in colored mortar to prevent water loss too quickly and maintain the wetness and working performance of the mortar.

[0060] Anti-cracking agents are mainly used in colored mortar to improve the mortar's anti-cracking properties and prevent cracks from forming in the mortar during the drying or curing process.

[0061] Water repellent and water reducing agent are both anti-efflorescence agents. Water repellent has tax-increasing and weather-resistant properties, and can effectively protect the mortar surface from water erosion, thereby inhibiting the occurrence of efflorescence; water reducing agent reduces the water consumption in the mortar and reduces the water-cement ratio, thereby reducing the possibility of alkali in the cement migrating to the surface with water, thereby achieving the purpose of inhibiting efflorescence. In addition, in order to improve secondary efflorescence, an appropriate amount of defoamer can be added to eliminate bubbles in the mortar and reduce the pores left after the bubbles burst, thereby reducing the possibility of water and alkali migrating to the surface through these pores. At the same time, the defoamer can also improve the strength of the mortar.

[0062] Fly ash, silica fume or kaolin is used as filler to adjust the performance of mortar and reduce costs.

[0063] The invention is suitable for the decoration construction of various roof tiles, and is particularly suitable for the restoration of ancient buildings or the construction of antique buildings.

[0064] The above is only a preferred embodiment of the present invention and does not limit the invention. It should be pointed out that for ordinary technicians in this field, under the technical enlightenment provided by the present invention, other equivalent improvements can be made, all of which can achieve the purpose of the present invention and should be regarded as the protection scope of the present invention.

Claims

1. A colored mortar suitable for roof tiles without spraying paint, characterized in that: The invention comprises the following ingredients in parts by weight: 40-60 parts of cement, 20-40 parts of sand, 5-15 parts of pigment, 0.1-0.2 parts of thickener, 0.1-0.2 parts of water retaining agent, 0.1-0.3 parts of anti-cracking agent, 0.05-0.1 parts of water repellent, 0.03-0.06 parts of water reducing agent and 10-30 parts of filler.

2. The colored mortar suitable for roof tiles without spraying paint according to claim 1, characterized in that: The pigment is a natural mineral pigment or a synthetic inorganic pigment.

3. The colored mortar suitable for roof tiles without spraying paint according to claim 1, characterized in that: The sand material is one of mineral aggregate, quartz sand or crystal stone.

4. The colored mortar suitable for roof tiles without spraying paint according to claim 1, characterized in that: The filler is at least one of heavy calcium powder, fly ash, silica fume or metakaolin.

5. A construction method for colored mortar suitable for roof tiles without spraying paint, characterized in that: The specific steps include: 1) Base treatment: clean the roof tiles, remove oil and dust, and spray primer; 2) Preparation of colored mortar: Mix the cement, sand, pigment and filler in claim 1 and stir evenly, then add thickener, water retaining agent and anti-cracking agent, stir until completely mixed, add water to adjust the consistency, and finally add water repellent and water reducing agent; 3) Spraying construction: Use a mortar sprayer to evenly spray the prepared colored mortar on the roof tile surface with a spraying thickness of 1 to 3 mm; 4) Maintenance management: After the construction is completed, maintenance management shall be carried out.

6. The method for preparing a paint-free colored mortar suitable for roof tiles according to claim 5, characterized in that: In the step 1), the primer is sprayed to a thickness of 1-3 mm and is sprayed until the base layer is completely covered.

7. The method for preparing a paint-free colored mortar suitable for roof tiles according to claim 5, characterized in that: The maintenance management in step 4) includes covering and watering maintenance; The covering is to cover the surface with straw mats, sawdust or geotextile within 3 to 12 hours after the mortar is sprayed to prevent excessive evaporation of water and direct sunlight; The watering maintenance is to water once every 3 hours during the first three days and nights after mortar spraying, water twice at night, and then water 3 times every day and night.

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