Admixture for enhancing mirror finish effect of cement-based materials, its preparation method and usage method

Abstract

The present invention discloses an admixture for enhancing the mirror effect of cement-based materials, its preparation method and usage method. The admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak the treated Chlorophyllum molybdites in a CL modification solution at 20-80°C for 30 minutes to 12 hours, filter the modification solution, dry the modified Chlorophyllum molybdites at 20-150°C for 30 minutes to 12 hours, grind the dried Chlorophyllum molybdites into powder and sieve it to obtain an admixture in the form of powder with a particle size not greater than 0.15 mm. The admixture releases bioactive compounds during the dissolution process, which can significantly reduce the surface tension of the cement paste, reduce the generation of bubbles, change the charge property of the neat paste, and inhibit the adhesion between the neat paste and the mold, thus meeting the requirements of mirror-like cement-based materials.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete admixtures for building materials, and particularly relates to an admixture for enhancing the mirror effect of cement-based materials, its preparation method and usage method. Background Art

[0002] After modern concrete projects meet performance indicators such as workability, durability, and mechanical properties, higher requirements are put forward for the appearance of buildings. Mirror concrete is a new type of building form, which has become an embodiment of modern engineering aesthetics with its smooth surface, delicate texture, and fine texture. In addition, mirror concrete not only reduces processes such as plastering, shortens the construction period, and is conducive to saving equipment, labor, management, etc. costs, but also, after being formed once, it does not require plastering and repair, reducing the generation of construction waste and being conducive to resource conservation and environmental protection.

[0003] In the construction of mirror concrete, admixtures such as defoamers and water reducers are usually incorporated, combined with relatively high requirements for construction technology, to promote the production of a mirror effect on the concrete surface. However, the effects of these admixtures currently used are usually developed to meet other requirements such as defoaming and water reduction, and there is a lack of an admixture specifically for enhancing the mirror effect of concrete. Summary of the Invention

[0004] Object of the Invention: The object of the present invention is to provide a preparation method of an admixture for enhancing the mirror effect of cement-based materials; another object of the present invention is to provide an admixture for enhancing the mirror effect of cement-based materials; another object of the present invention is to provide a usage method of an admixture for enhancing the mirror effect of cement-based materials.

[0005] Technical Solution: The present invention provides an admixture for enhancing the mirror effect of cement-based materials, and the preparation method includes the following steps:

[0006] (1) Wash and cut the Chlorophyllum molybdites into pieces to obtain the processed Chlorophyllum molybdites.

[0007] (2) Immerse the processed Chlorophyllum molybdites in a CL modification solution at 20 - 80 °C for 30 min - 12 h to obtain the modified Chlorophyllum molybdites; wherein, the CL modification solution includes sodium D-isoascorbate, alanine, calcium lignosulfonate, and citric acid.

[0008] (3) The modified Chlorophyllum molybdites are successively dried, ground, and sieved to obtain a powdery admixture.

[0009] Preferably, in step (2), the CL modification solution includes the following components: by weight, 20 - 40 parts of sodium D-isoascorbate, 20 - 40 parts of alanine, 5 - 10 parts of calcium lignosulfonate, 5 - 10 parts of citric acid, and 100 - 300 parts of distilled water.

[0010] Preferably, in step (3), the drying conditions of the modified Chlorophyllum molybdites are as follows: drying at 20-150 °C for 30 min-12 h.

[0011] Preferably, in step (3), the particle size of the finally obtained admixture is not greater than 0.15 mm.

[0012] On the other hand, the present invention also provides an admixture for enhancing the mirror effect of cement-based materials prepared by the above preparation method.

[0013] On the other hand, the present invention also provides a method for using the above admixture for enhancing the mirror effect of cement-based materials.

[0014] Preferably, the dosage of the admixture is 0.1%-1.0% of the cementitious material.

[0015] Preferably, the usage method is: mixing the admixture with mixing water and stirring for 30 s-5 min, and then mixing the stirred suspension with the cementitious material.

[0016] An admixture for enhancing the mirror effect of cement-based materials of the present invention releases bioactive compounds during the dissolution process, significantly reduces the surface tension of the cement paste, reduces the generation of bubbles, changes the charge property of the neat paste, and inhibits the adhesion between the neat paste and the mold, thereby meeting the requirements of mirror cement-based materials.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages:

[0018] (1) The modified Chlorophyllum molybdites powder releases bioactive compounds during the dissolution process, has a water-reducing effect, improves the workability of the mixture, and has little effect on the setting time.

[0019] (2) The combined action of the components of Chlorophyllum molybdites itself and the modified molecules reduces the surface tension of the cement paste, reduces the generation of bubbles, reduces the porosity, and improves the surface flatness.

[0020] (3) The soluble substances in the admixture change the charge property of the neat paste and inhibit the adhesion between the neat paste and the mold, thereby meeting the requirements of mirror cement-based materials. Detailed implementation manners

[0021] The following further illustrates the present invention with specific examples, but is not limited to the examples.

[0022] In this embodiment, the bottom surfaces of dry and saturated surface-dry specimens are photographed by an industrial microscope for comparison.

[0023] In this embodiment, PP molds are used to form specimens.

[0024] In this embodiment, the water-cement ratio of the neat cement paste is 0.5, and the admixture dosage is the mass ratio of the admixture to the cement.

[0025] The demolding time in this embodiment is 3 days.

[0026] Control group

[0027] Without adding an admixture to enhance the mirror effect of the cement-based material, prepare a neat cement paste specimen with a water-binder ratio of 0.5 and make a specimen.

[0028] Example 1

[0029] This embodiment provides an admixture for enhancing the mirror effect of cement-based materials. The admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak 100 parts of the treated Chlorophyllum molybdites in 300 parts of CL modification liquid at 50 °C for 2 hours, filter the modification liquid, dry the modified Chlorophyllum molybdites at 80 °C for 5 hours, grind the dried Chlorophyllum molybdites and sieve it to obtain an admixture in the form of powder with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at a dosage of 0.5% of the neat cement paste and stir for 2 minutes, then add the mixed suspension to the cement and stir to make a specimen.

[0030] Among them, the CL modification liquid includes the following components: by weight, 20 parts of D-isoascorbic acid sodium, 40 parts of alanine, 5 parts of calcium lignosulfonate, 10 parts of citric acid, and 200 parts of distilled water.

[0031] Example 2

[0032] This embodiment provides an admixture for enhancing the mirror effect of cement-based materials. The admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak 100 parts of the treated Chlorophyllum molybdites in 300 parts of CL modification liquid at 50 °C for 2 hours, filter the modification liquid, dry the modified Chlorophyllum molybdites at 80 °C for 5 hours, grind the dried Chlorophyllum molybdites and sieve it to obtain an admixture in the form of powder with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at a dosage of 0.5% of the neat cement paste and stir for 2 minutes, then add the mixed suspension to the cement and stir to make a specimen.

[0033] Among them, the CL modification liquid includes the following components: by weight, 40 parts of D-isoascorbic acid sodium, 20 parts of alanine, 10 parts of calcium lignosulfonate, 5 parts of citric acid, and 200 parts of distilled water.

[0034] Example 3

[0035] This embodiment provides an admixture for enhancing the mirror finish effect of cement-based materials. The admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak 100 parts of the treated Chlorophyllum molybdites in 300 parts of CL modification liquid at 50 °C for 2 h, filter the modification liquid, bake the modified Chlorophyllum molybdites at 80 °C for 5 h, grind the baked Chlorophyllum molybdites and sieve it to obtain an admixture in the form of powder with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at an admixture content of 0.5% of the cement paste and stir for 2 min, then add the mixed suspension to the cement and stir to make specimens.

[0036] Among them, the CL modification liquid includes the following components: By weight, 30 parts of D-isoascorbic acid sodium, 30 parts of alanine, 7 parts of calcium lignosulfonate, 7 parts of citric acid, and 200 parts of distilled water.

[0037] Example 4

[0038] Compared with Example 3, the difference in this example is that: the admixture content in this example is 0.1%. Specifically, the admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak 100 parts of the treated Chlorophyllum molybdites in 300 parts of CL modification liquid at 50 °C for 2 h, filter the modification liquid, bake the modified Chlorophyllum molybdites at 80 °C for 5 h, grind the baked Chlorophyllum molybdites and sieve it to obtain an admixture in the form of powder with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at an admixture content of 0.1% of the cement paste and stir for 2 min, then add the mixed suspension to the cement and stir to make specimens.

[0039] Among them, the CL modification liquid includes the following components: By weight, 30 parts of D-isoascorbic acid sodium, 30 parts of alanine, 7 parts of calcium lignosulfonate, 7 parts of citric acid, and 200 parts of distilled water.

[0040] Example 5

[0041] Compared with Example 3, the difference in this example is that: the admixture content in this example is 1%. Specifically, the admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak 100 parts of the treated Chlorophyllum molybdites in 300 parts of CL modification liquid at 50 °C for 2 h, filter the modification liquid, bake the modified Chlorophyllum molybdites at 80 °C for 5 h, grind the baked Chlorophyllum molybdites and sieve it to obtain an admixture in the form of powder with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at an admixture content of 1% of the cement paste and stir for 2 min, then add the mixed suspension to the cement and stir to make specimens.

[0042] Among them, the CL modification liquid includes the following components: By weight, 30 parts of D-isoascorbic acid sodium, 30 parts of alanine, 7 parts of calcium lignosulfonate, 7 parts of citric acid, and 200 parts of distilled water.

[0043] Comparative Example 1

[0044] Compared with Example 3, the difference in this ratio is that no CL modification liquid is added for modification in this comparative example. Specifically, the admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, dry the washed Chlorophyllum molybdites at 80°C for 5 h, grind and sieve the dried Chlorophyllum molybdites to obtain an admixture in powder form with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at a dosage of 0.5% of the neat cement paste and stir for 2 min, then add the mixed suspension to the cement and stir to make specimens.

[0045] Comparative Example 2

[0046] Compared with Example 3, the difference in this ratio is that the CL modification liquid in this comparative example does not include sodium D-isoascorbate. Specifically, the admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak 100 parts of the treated Chlorophyllum molybdites in 300 parts of CL modification liquid at 50°C for 2 h for modification, filter the modification liquid, dry the modified Chlorophyllum molybdites at 80°C for 5 h, grind and sieve the dried Chlorophyllum molybdites to obtain an admixture in powder form with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at a dosage of 0.5% of the neat cement paste and stir for 2 min, then add the mixed suspension to the cement and stir to make specimens.

[0047] Among them, the CL modification liquid includes the following components: by weight, 30 parts of alanine, 7 parts of calcium lignosulfonate, 7 parts of citric acid, and 200 parts of distilled water.

[0048] Comparative Example 3

[0049] Compared with Example 3, the difference in this ratio is that the CL modification liquid in this comparative example does not include alanine. Specifically, the admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak 100 parts of the treated Chlorophyllum molybdites in 300 parts of CL modification liquid at 50°C for 2 h for modification, filter the modification liquid, dry the modified Chlorophyllum molybdites at 80°C for 5 h, grind and sieve the dried Chlorophyllum molybdites to obtain an admixture in powder form with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at a dosage of 0.5% of the neat cement paste and stir for 2 min, then add the mixed suspension to the cement and stir to make specimens.

[0050] Among them, the CL modification liquid includes the following components: by weight, 30 parts of sodium D-isoascorbate, 7 parts of calcium lignosulfonate, 7 parts of citric acid, and 200 parts of distilled water.

[0051] Comparative Example 4

[0052] Compared with Example 3, the difference in this comparative example is that the CL modification liquid in this comparative example does not include calcium lignosulfonate. Specifically, the admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak 100 parts of the treated Chlorophyllum molybdites in 300 parts of the CL modification liquid at 50°C for 2 hours for modification, filter the modification liquid, dry the modified Chlorophyllum molybdites at 80°C for 5 hours, grind the dried Chlorophyllum molybdites into powder and sieve it to obtain an admixture in powder form with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at an admixture content of 0.5% of the neat cement slurry and stir for 2 minutes, then add the mixed suspension to the cement and stir to make specimens.

[0053] Among them, the CL modification liquid includes the following components: By weight, 30 parts of D-isoascorbic acid sodium, 30 parts of alanine, 7 parts of citric acid, and 200 parts of distilled water.

[0054] Comparative Example 5

[0055] Compared with Example 3, the difference in this comparative example is that the CL modification liquid in this comparative example does not include citric acid. Specifically, the admixture is prepared by the following method: Wash the Chlorophyllum molybdites, cut it into pieces, soak 100 parts of the treated Chlorophyllum molybdites in 300 parts of the CL modification liquid at 50°C for 2 hours for modification, filter the modification liquid, dry the modified Chlorophyllum molybdites at 80°C for 5 hours, grind the dried Chlorophyllum molybdites into powder and sieve it to obtain an admixture in powder form with a particle size not greater than 0.15 mm. Mix the admixture with mixing water at an admixture content of 0.5% of the neat cement slurry and stir for 2 minutes, then add the mixed suspension to the cement and stir to make specimens.

[0056] Among them, the CL modification liquid includes the following components: By weight, 30 parts of D-isoascorbic acid sodium, 30 parts of alanine, 7 parts of calcium lignosulfonate, and 200 parts of distilled water.

[0057] Glossiness test

[0058] Prepare the admixture according to the formulations of the examples and comparative examples and add it to the cement-based material. According to GB / T 9754-2007 "Paints and varnishes - Determination of specular gloss at 20°, 60° and 85° of non-metallic paint films", use a glossiness meter at a 60° angle to test the glossiness of the cement-based material and record it in Table 1.

[0059] Surface pore test

[0060] Prepare the admixture according to the formulations of the examples and comparative examples and add it to the cement-based material, observe the maximum pore diameter and pore area ratio on the surface, and record it in Table 1

[0061] Table 1 Detection results of the specular effect of the cement-based material

[0062]

[0063]

[0064] The results show that, compared with the control group, the glossiness of the bottom surface of the neat cement specimens in Examples 1, 2 and 3 increased by 37.5%, 43.8% and 50.0% respectively, the maximum pore size decreased by 97.0%, 97.6% and 99.1% respectively, and the pore area decreased by 95.2%, 96.8% and 99.4% respectively; after adding 0.1%, 0.5% and 1.0% of the admixture, the glossiness of the bottom surface of the neat cement specimens increased by 12.5%, 50.0% and 31.2% respectively, the maximum pore size decreased by 65.5%, 99.1% and 83.2% respectively, and the pore area ratio decreased by 71.1%, 99.4% and 89.8% respectively. The mirror effects of Comparative Examples 1, 2 and 3 are inferior to those of the three Examples. This shows that the admixture of the present invention greatly improves the mirror effect of the cement-based material. Among them, Example 3 is the best ratio and 0.5% is the best dosage.

[0065] The above are all preferred embodiments of the present invention, and do not limit the protection scope of this application. Any modifications, equivalent substitutions, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation method of an admixture for enhancing the mirror effect of cement-based materials, characterized in that, The preparation method comprises the following steps: (1) Wash and cut the Chlorophyllum molybdites into pieces to obtain the treated Chlorophyllum molybdites; (2) Immerse the treated Chlorophyllum molybdites in a CL modification solution at 20-80 °C for modification for 30 min to 12 h to obtain the modified Chlorophyllum molybdites; wherein, the CL modification solution comprises the following components: by weight, 20-40 parts of sodium D-isoascorbate, 20-40 parts of alanine, 5-10 parts of calcium lignosulfonate, 5-10 parts of citric acid, and 100-300 parts of distilled water; (3) The modified Chlorophyllum molybdites are successively dried, ground, and sieved to obtain a powdery admixture.

2. The preparation method of the admixture for enhancing the mirror effect of cement-based materials according to claim 1, characterized in that In step (3), the drying conditions of the modified Chlorophyllum molybdites are: drying at 20-150 °C for 30 min to 12 h.

3. The preparation method of the admixture for enhancing the mirror effect of cement-based materials according to claim 1, characterized in that In step (3), the particle size of the finally obtained admixture is not greater than 0.15 mm.

4. An admixture for improving the mirror effect of cement-based materials prepared by the preparation method according to any one of claims 1-3.

5. A method for using an admixture for enhancing the mirror effect of cement-based materials according to claim 4, characterized in that, The dosage of the admixture is 0.1%-1.0% of the cementitious material.

6. The method for using an admixture for enhancing the mirror effect of cement-based materials according to claim 5, characterized in that The usage method is: mixing the admixture with mixing water and stirring for 30 s to 5 min, and then mixing the stirred suspension with the cementitious material.

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