Cement-based building material without alkali efflorescence performance

Abstract

The invention discloses a cement-based building material without alkali efflorescence performance. The cement-based building material is composed of 425 grade cement, mixed machine-made sand, an alkali inhibitor, 105 silicon steel latex powder, hundred thousand cellulose, starch ether, anti-crack fibers, dispersible latex powder and wood fibers. The alkali inhibitor and the 105 silicon steel latex powder are selected to achieve a synergistic effect, and cement alkaline precipitation is thoroughly inhibited; the crack resistance and the structural stability of the whole material are enhanced by the two-grading machine-made sand and the crack-resistant fibers; starch ether and cellulose are combined to optimize the construction performance and reduce the sagging rate. And the problem of alkali efflorescence of the wall surface is solved by adopting an alkali-resistant process, so that the outer wall is more attractive and lasting.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and more specifically, to a building material with a cement-based non-efflorescence performance. Background Art

[0002] Traditional cement-based building materials (such as plastering mortar, exterior wall putty, etc.) have the following defects in application:

[0003] Serious efflorescence phenomenon: The alkaline components in cement (such as calcium hydroxide) are easily reacted with moisture and carbon dioxide in the air to form white calcium carbonate crystals (commonly known as "efflorescence"), resulting in white frost and powdering on the coating surface, affecting the aesthetics and durability.

[0004] Insufficient crack resistance: Ordinary cement-based materials are prone to cracking due to large shrinkage stress and poor toughness during drying or temperature changes, reducing the structural integrity and waterproofness.

[0005] Poor workability: High fluidity of traditional materials is likely to cause sagging, requiring multiple coatings. Adding thickeners may affect the uniformity of the slurry and increase the construction difficulty. Contradiction between strength and durability: Increasing the cement dosage to improve early strength will exacerbate the release of alkalinity; while simply relying on organic additives (such as latex powder) can improve flexibility, but may sacrifice long-term strength.

[0006] Currently, the improvement methods for the above problems include:

[0007] Surface treatment method: Such as painting an anti-alkali primer or sealant, which can only temporarily cover the efflorescence and cannot inhibit the migration of alkaline substances from the root.

[0008] Mineral admixture substitution: Using fly ash, silica fume, etc. to partially replace cement to reduce alkalinity, but too high an admixture content will significantly reduce the early strength of the material.

[0009] Single fiber addition: Such as chopped glass fibers can improve crack resistance, but it is difficult to meet the requirements of construction anti-sagging, and poor fiber dispersion is likely to cause agglomeration.

[0010] Therefore, how to provide a cement-based building material with a non-efflorescence performance that fundamentally inhibits efflorescence, combines the optimized gradation of multi-stage sand aggregates, the synergistic enhancement of toughness by anti-crack fibers and wood fibers, and the regulation of rheological properties by starch ether and cellulose to achieve a comprehensive improvement in crack resistance, workability and durability is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0011] In view of this, the present invention provides a cement-based building material with a non-efflorescence performance.

[0012] To achieve the above object, the present invention provides a building material with a cement-based non-alkali-return performance, which is prepared from the following raw materials in parts by mass:

[0013] 425-grade cement: 800-900 parts, machine-made sand: 1000-1300 parts, alkali inhibitor: 10-15 parts, 105 silicon steel latex powder: 10-15 parts, 100,000 cellulose: 5-7 parts, starch ether: 0.5-1 part, 6mm anti-cracking fiber: 1-3 parts, redispersible latex powder: 2-4 parts, wood fiber: 7-9 parts.

[0014] Preferably, the building material with a cement-based non-alkali-return performance includes the following steps:

[0015] (1) Weigh each raw material according to the ratio;

[0016] (2) Add 425-grade cement, machine-made sand, alkali inhibitor, 105 silicon steel latex powder, redispersible latex powder, wood fiber and 6mm anti-cracking fiber into a mixer in sequence and stir until evenly mixed;

[0017] (3) Add 100,000 cellulose and starch ether and continue to stir;

[0018] (4) Slowly add an appropriate amount of water and stir until the material is in a uniform paste state and has no flowing state to obtain the finished product.

[0019] Preferably, in the step (1), the mass ratio of the 40-70 mesh sand to the 70-140 mesh sand in the machine-made sand is preferably 0.8-1.2:1, and more preferably 1:1.

[0020] Preferably, in the step (1), the mass ratio of the 105 silicon steel latex powder to the redispersible latex powder is preferably 3.5-4.5:1, and more preferably 3.8-4.2:1.

[0021] Through the above technical solutions, compared with the prior art, the present invention discloses a building material with a cement-based non-alkali-return performance. The present invention uses an alkali inhibitor and 105 silicon steel latex powder to act synergistically to completely inhibit the precipitation of cement alkalinity; the double-graded machine-made sand and anti-cracking fiber enhance the anti-cracking performance and structural stability of the whole material; the combination of starch ether and cellulose optimizes the construction performance and reduces the sag rate. Furthermore, the problem is fundamentally solved, and an anti-alkali process is adopted to solve the problem of wall alkali return, making the exterior wall more beautiful and long-lasting. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the provided drawings.

[0023] Figure 1 The accompanying drawings are schematic diagrams of the effects of the embodiments of the present invention.

[0024] Figure 2 The accompanying drawings are schematic diagrams of the effects of the comparative examples of the present invention. Detailed implementation manners

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] The present invention provides a building material with a cement-based non-alkali-return performance, which is prepared from the following raw materials in parts by mass:

[0027] 425-grade cement: 800 - 900 parts, machine-made sand: 1000 - 1300 parts, alkali inhibitor: 10 - 15 parts, 105 silicon steel latex powder: 10 - 15 parts, 100,000 cellulose: 5 - 7 parts, starch ether: 0.5 - 1 part, 6mm anti-cracking fiber: 1 - 3 parts, redispersible latex powder: 2 - 4 parts, wood fiber: 7 - 9 parts.

[0028] In the present invention, the mass fraction of the 425-grade cement is preferably 820 - 880 parts, more preferably 840 - 860 parts, and even more preferably 845 - 855 parts. The 425-grade cement can improve the overall strength of the material.

[0029] In the present invention, the mass fraction of the machine-made sand is preferably 1050 - 1250 parts, more preferably 1100 - 1200 parts, and even more preferably 1125 - 1185 parts. The machine-made sand mainly acts as an aggregate for support.

[0030] In the present invention, the mass fraction of the alkali inhibitor is preferably 10.5 - 13.5 parts, more preferably 11 - 13 parts, and even more preferably 11.5 - 12.5 parts. The function of the alkali inhibitor is to improve the overall strength of the material and can react with the alkali in the cement to inhibit the occurrence of the alkaline phenomenon of the product.

[0031] In the present invention, the mass fraction of the 105 silicon steel latex powder is preferably 10.5 - 13.5 parts, more preferably 11 - 13 parts, and even more preferably 11.5 - 12.5 parts. The 105 silicon steel latex powder is used to enhance the overall strength and anti - permeability of the material.

[0032] In the present invention, the mass fraction of the 100,000 - cellulose is preferably 5.3 - 6.8 parts, more preferably 5.5 - 6.5 parts, and even more preferably 5.8 - 6.2 parts. The 100,000 - cellulose mainly plays a moisturizing role, enabling the cement to fully undergo the hydration reaction and enhancing its later strength.

[0033] In the present invention, the mass fraction of the starch ether is preferably 0.53 - 0.83 parts, more preferably 0.55 - 0.75 parts, and even more preferably 0.58 - 0.68 parts. The starch ether can make the whole material have an anti - sagging effect.

[0034] In the present invention, the mass fraction of the 6 - mm anti - crack fiber is preferably 0.8 - 2.8 parts, more preferably 1.2 - 2.5 parts, and even more preferably 1.5 - 2.2 parts. The 6 - mm anti - crack fiber can effectively enhance its anti - crack performance.

[0035] In the present invention, the mass fraction of the redispersible latex powder is preferably 2.2 - 3.8 parts, more preferably 2.5 - 3.5 parts, and even more preferably 2.8 - 3.2 parts. The redispersible latex powder is used to enhance the early strength. When mixed with the 105 silicon steel latex powder, it can achieve better anti - permeability and strength.

[0036] In the present invention, the mass fraction of the wood fiber is preferably 7.2 - 8.8 parts, more preferably 7.5 - 8.5 parts, and even more preferably 7.8 - 8.2 parts. The wood fiber can prevent the product from cracking in the later stage.

[0037] The present invention also provides a building material with a cement - based non - efflorescence performance, comprising the following steps:

[0038] (1) Weigh each raw material according to the ratio;

[0039] (2) Add 425 - grade cement, machine - made sand, alkali inhibitor, 105 silicon steel latex powder, redispersible latex powder, wood fiber and 6 - mm anti - crack fiber into the mixer in sequence, and stir until evenly mixed;

[0040] (3) Add 100,000 - cellulose and starch ether, and continue to stir;

[0041] (4) Slowly add an appropriate amount of water, and stir until the material is in a uniform paste state and has no flowing state to obtain the finished product.

[0042] In the present invention, the mass ratio of the 40-70 mesh sand to the 70-140 mesh sand in the manufactured sand in step (1) is preferably 0.8-1.2:1, and more preferably 1:1.

[0043] In the present invention, the mass ratio of the 105 silicon steel latex powder to the redispersible latex powder in step (1) is preferably 3.5-4.5:1, and more preferably 3.8-4.2:1.

[0044] The present invention also provides an application in a building material with a cement-based non-alkali-return performance.

[0045] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0046] Example 1

[0047] Take 800 kg of 425-grade cement, 1000 kg of manufactured sand, 10 kg of alkali inhibitor, 10 kg of 105 silicon steel latex powder, 1 kg of 6 mm anti-cracking fiber, 2.5 kg of redispersible latex powder, and 7 kg of wood fiber, and add them to a mixer in sequence. Stir until evenly mixed, then add 5 kg of 100,000 cellulose and 0.5 kg of starch ether, continue to stir, and finally slowly add an appropriate amount of water. Stir until the material is in a uniform paste state and has no flowing state to obtain the building material with a cement-based non-alkali-return performance.

[0048] Example 2

[0049] Take 900 kg of 425-grade cement, 1300 kg of manufactured sand, 15 kg of alkali inhibitor, 15 kg of 105 silicon steel latex powder, 3 kg of 6 mm anti-cracking fiber, 4 kg of redispersible latex powder, and 9 kg of wood fiber, and add them to a mixer in sequence. Stir until evenly mixed, then add 7 kg of 100,000 cellulose and 1 kg of starch ether, continue to stir, and finally slowly add an appropriate amount of water. Stir until the material is in a uniform paste state and has no flowing state to obtain the building material with a cement-based non-alkali-return performance.

[0050] Example 3

[0051] Take 850 kg of 425-grade cement, 1150 kg of manufactured sand, 12 kg of alkali inhibitor, 12 kg of 105 silicon steel latex powder, 2 kg of 6 mm anti-cracking fiber, 3 kg of redispersible latex powder, and 8 kg of wood fiber, and add them to a mixer in sequence. Stir until evenly mixed, then add 6 kg of 100,000 cellulose and 0.6 kg of starch ether, continue to stir, and finally slowly add an appropriate amount of water. Stir until the material is in a uniform paste state and has no flowing state to obtain the building material with a cement-based non-alkali-return performance.

[0052] Comparative Example 1

[0053] Take 850 kg of 425 - labeled cement, 1150 kg of manufactured sand, 2 kg of 6 - mm anti - crack fiber, 3 kg of redispersible latex powder, and 8 kg of wood fiber, and add them to a mixer in sequence. Stir until evenly mixed, then add 6 kg of 100,000 - cellulose and 0.6 kg of starch ether, and continue to stir. Finally, slowly add an appropriate amount of water and stir until the material becomes a homogeneous paste and has no flowing state to obtain a cement - based building material. As Figure 2 The cement - based materials shown all contain alkalinity, and the alkali - return on the wall is particularly obvious. The whole wall will turn white and blotchy, affecting the beauty of the wall and the uneven color of the paint.

[0054] Thus Figure 1 Figure 2 It can be seen that the cement - based building material without alkali - return performance solves the problem fundamentally by adding an alkali - suppressing agent and 105 silicon steel latex powder components, and adopts an anti - alkali process to solve the problem of alkali - return on the wall, making the exterior wall more beautiful and long - lasting.

[0055] The present invention provides a cement - based building material without alkali - return performance. The present invention uses an alkali - suppressing agent and 105 silicon steel latex powder to act synergistically to completely inhibit the precipitation of cement alkalinity; the double - graded manufactured sand and anti - crack fiber enhance the anti - crack performance and structural stability of the whole material; the combination of starch ether and cellulose optimizes the construction performance and reduces the sag rate. Thus, the problem is solved fundamentally, and an anti - alkali process is adopted to solve the problem of alkali - return on the wall, making the exterior wall more beautiful and long - lasting.

[0056] In this specification, each embodiment is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0057] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A building material with a cement-based non-efflorescence performance, characterized in that, It is prepared mainly from the following raw materials in parts by mass: 800 - 900 parts of 425 - grade cement, 1000 - 1300 parts of machine - made sand, 10 - 15 parts of alkali inhibitor, 10 - 15 parts of 105 silicon steel latex powder, 5 - 7 parts of 100,000 - grade cellulose, 0.5 - 1 part of starch ether, 1 - 3 parts of 6 - mm anti - crack fiber, 2 - 4 parts of redispersible latex powder, 7 - 9 parts of wood fiber.

2. The building material with a cement-based non-alkali-return performance according to claim 1, characterized in that, The building material with no alkali return performance based on cement includes the following steps: (1) Weigh each raw material according to the ratio. (2) Add 425 - grade cement, machine - made sand, alkali inhibitor, 105 silicon steel latex powder, redispersible latex powder, wood fiber and 6 - mm anti - crack fiber into the mixer in sequence and stir until evenly mixed. (3) Add 100,000 - grade cellulose and starch ether and continue to stir. (4) Slowly add an appropriate amount of water and stir until the material is in a uniform paste state without flowing, then the finished product is obtained.

3. The building material with a cement-based non-alkali-return performance according to claim 2, characterized in that, In step (1), the mass ratio of the 40 - 70 - mesh sand to the 70 - 140 - mesh sand in the machine - made sand is preferably 0.8 - 1.2:1, and more preferably 1:

1.

4. The building material with a cement-based non-alkali-return performance according to claim 2, characterized in that, In step (1), the mass ratio of the 105 silicon steel latex powder to the redispersible latex powder is preferably 3.5 - 4.5:1, and more preferably 3.8 - 4.2:1.

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