Multifunctional marble dry-mixed mortar

Abstract

The invention relates to the field and particularly discloses multifunctional marble dry-mixed mortar which is characterized by comprising cement, marble, an expanding agent, a water reducing agent, rubber powder, a water repellent, a stabilizer, calcium formate, a defoaming agent and fibers. The dry-mixed mortar has the advantages that the marble is adopted to replace sand to serve as aggregate and is reasonably matched with the cement, the rubber powder, the fibers, the calcium formate, the expanding agent, the water repellent and the like, the obtained dry-mixed mortar keeps a stable structure in a low-temperature environment, and the service life is prolonged; high flexibility and tensile strength are achieved, and cracks can be reduced; the marble adopts continuous grading and is matched with the water repellent, the stabilizer and the like, so that gaps in the mortar can be effectively filled, a compact waterproof structure is formed, moisture permeation is prevented, and the mortar has better applicability in a humid environment or a part with a waterproof requirement.

Description

Technical Field The present invention relates to the technical field of dry-mix mortar, in particular to a multifunctional marble dry-mix mortar. Background Art Dry-mix mortar is a granular or powdered mixture of cement, sand, mineral admixtures, and additives in specific proportions, accurately measured and uniformly mixed in a specialized production plant. At the construction site, it can be used simply by adding water and stirring in the prescribed proportions, improving construction efficiency and reducing labor intensity. Common dry-mix mortars primarily include cement, sand, rubber powder, a water reducer, and a stabilizer. After drying and screening, they are precisely measured and mixed in specific proportions in large-scale, specialized production equipment. However, the above-mentioned dry-mix mortar has the following problems: 1. Raw material supply and quality issues: Sand is the main raw material, and my country's natural sand and gravel resources are scarce. Coupled with high-end additives, the overall cost has increased significantly, and the supply-demand contradiction has become prominent. 2. Compatibility issues with wall materials: When used with new wall materials, the mortar has poor construction performance issues, such as excessive water absorption by the blocks, resulting in wall cracking, incomplete masonry and voids, and insufficient adhesion after drying and curing, which makes the wall prone to cracking under deformation stress. 3. The construction environment has a significant impact: For example, in the high temperatures of summer, the cement hydration reaction speeds up, and the water in the wet-mix mortar evaporates quickly, resulting in a rapid loss of consistency. In the low temperatures of winter, the cement hydration speed is significantly reduced, and the mortar freezes before reaching a certain strength. The internal water freezes and expands, destroying the mortar structure and reducing its durability. Therefore, there is an urgent need to develop a multifunctional dry-mix mortar that reduces the amount of raw sand and has crack resistance, frost resistance, and waterproof properties. Summary of the Invention The object of the present invention is to provide a multifunctional marble dry powder mortar to solve the problems existing in the prior art.

[0001] The present invention is implemented by the following technical scheme: a multifunctional marble dry-mix mortar, which includes, by weight, 360-440 parts of cement, 500-600 parts of marble, 20-35 parts of an expansion agent, 0.5-0.9 parts of a water reducer, 0.8-1.2 parts of glue powder, 1-3 parts of a hydrophobic agent, 0.3-0.6 parts of a stabilizer, 3-5 parts of calcium formate, 0.3-0.5 parts of a defoaming agent, and 3-6 parts of fiber.

[0002] Furthermore, the cement is 42.5 grade cement.

[0003] Furthermore, the particle size of the marble is 0-5 mm.

[0004] Furthermore, the particle size of the marble is d, among which the marble with 0<d≤0.08mm accounts for 6-7 parts, the marble with 0.08<d≤0.63mm accounts for 29-31 parts, the marble with 0.63<d≤1.25mm accounts for 7-9 parts, the marble with 1.25<d≤2.5mm accounts for 16-18 parts, and the marble with 2.5<d≤5mm accounts for 34-35 parts.

[0005] Furthermore, the rubber powder is renewable latex powder with a solid content of more than 98% and a particle size of 100-600 μm.

[0006] Furthermore, the water repellent is a polysiloxane waterproofing agent.

[0007] Furthermore, the stabilizer is hydroxypropyl methylcellulose ether with a viscosity of 100,000.

[0008] Furthermore, the solid content of the calcium formate is above 99.8%.

[0009] Furthermore, the fibers are polypropylene fibers with a length of 15-20 mm.

[0010] Furthermore, the expansion agent is a U-shaped expansion agent.

[0011] The advantages of the present invention are: marble is used instead of sand as aggregate, and is reasonably proportioned with cement, glue powder, fiber, calcium formate, expansion agent, water repellent, etc. The obtained dry powder mortar maintains structural stability in low temperature environments and extends its service life. The low cost of marble helps to reduce overall production costs; it has high flexibility and tensile strength, which can reduce the occurrence of cracks; marble adopts continuous grading and is matched with water repellent, stabilizer, etc., which can effectively fill the gaps inside the mortar to form a dense waterproof structure, prevent water penetration, and has better applicability in humid environments or areas with waterproofing requirements. In short, due to its good crack resistance, frost resistance and waterproof properties, the dry powder mortar of the present invention can better resist the erosion of the external environment during long-term use, maintain good performance, thereby having higher durability and reducing the frequency of maintenance and replacement. DETAILED DESCRIPTION The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0012] Example 1: Multifunctional marble dry-mix mortar, which includes, by weight, 380 kg of cement, 590 kg of marble, 20.9 kg of expansion agent, 0.76 kg of water reducer, 0.95 kg of glue powder, 1.9 kg of water repellent, 0.38 kg of stabilizer, 3.8 kg of calcium formate, 0.38 kg of defoaming agent, and 3.8 kg of fiber.

[0013] The cement is P.C42.5 cement, the primary gelling material. Marble primarily serves as an aggregate and filler in dry-mix mortar, reducing the amount of cementitious materials used, lowering mortar shrinkage, and lowering the production cost of dry-mix mortar. Preferably, the marble has a particle size of 0-5 mm, using a continuous gradation. Specifically, the marble particle size is d, with 0 < d ≤ 0.08 mm accounting for 6.84 parts, 0.08 < d ≤ 0.63 mm accounting for 29.8 parts, 0.63 < d ≤ 1.25 mm accounting for 7.5 parts (of which 0.9-1.25 mm accounts for 3.01 parts), 1.25 < d ≤ 2.5 mm accounting for 17 parts, and 2.5 < d ≤ 5 mm accounting for 34.6 parts. Glue powder is an organic binder in the mortar, enhancing the material's flexural strength, impact resistance, wear resistance, and durability. Improve bonding performance, improve flexibility, improve water resistance, enhance aging resistance, and improve construction performance. In this embodiment, the rubber powder is renewable latex powder with a solid content of 98.5% and a particle size of 100-600μm. The hydrophobic agent is a polysiloxane waterproofing agent, which plays a role in waterproofing and early strength. The stabilizer is hydroxypropyl methylcellulose ether with a viscosity of 100,000, which is mainly used to optimize the construction performance and anti-sagging properties of the mortar. The solid content of calcium formate is 99.9%, which accelerates coagulation, improves early strength, improves fluidity, and reduces shrinkage cracks. The fiber is a polypropylene fiber with a length of 15-20mm. When the cement mortar matrix is ​​subjected to external force, the fiber limits and hinders the expansion of microcracks. The expansion agent is a U-type expansion agent, which compensates for shrinkage, improves density, enhances bonding force, and improves anti-cracking and waterproofing effects.

[0014] Example 2: This example is identical to Example 1, except that the multifunctional marble dry-mix mortar in this example comprises, by weight, 360 kg of cement, 500 kg of marble, 20 kg of expansion agent, 0.5 kg of water reducer, 0.8 kg of rubber powder, 1.5 kg of water repellent, 0.3 kg of stabilizer, 3 kg of calcium formate, 0.3 kg of defoamer, and 3 kg of fiber. The solids content of the rubber powder is 99%.

[0015] Example 3: This is identical to Example 1, except that the multifunctional marble dry-mix mortar in this example includes, by weight, 440 kg of cement, 600 kg of marble, 35 kg of expansion agent, 0.9 kg of water reducer, 1.2 kg of rubber powder, 3 kg of water repellent, 0.6 kg of stabilizer, 5 kg of calcium formate, 0.5 kg of defoamer, and 6 kg of fiber. The solids content of the rubber powder is 99.3%.

[0016] Comparative Example 1: A dry-mix mortar, which is the same as Example 1 as a whole, except that, in order to adjust the workability of the mortar to meet the construction requirements, the water reducer in this example is 1.9 kg, the glue powder is 1.9 kg, and the stabilizer is 0.76 kg.

[0017] Comparative Example 2: A dry-mix mortar, which is the same as Example 1 as a whole, except that, in order to adjust the workability of the mortar to meet the construction crack resistance, the expansion agent in this example is 17.1 kg and the fiber is 1.9 kg.

[0018] Comparative Example 3: A dry-mix mortar, which is the same as Example 1 as a whole, except that, in order to adjust the workability of the mortar to meet the construction impermeability, the water repellent in this example is 1.14 kg and the defoaming agent is 0.19 kg.

[0019] Comparative Example 4: A dry-mix mortar, which is the same as Example 1 as a whole, except that, in order to adjust the workability of the mortar to meet the strength and frost resistance required for construction, the cement in this example is 300 kg, the marble is 670 kg, and the calcium formate is 1.5 kg.

[0020] Comparative Example 5: A dry-mix mortar comprising, by weight, 380 kg of cement, 590 kg of sand, 20.9 kg of an expansive agent, 0.76 kg of a water reducer, 0.38 kg of a stabilizer, 3.8 kg of calcium formate, 0.38 kg of a defoaming agent, and 4.75 kg of rubber powder, wherein the types of the expansive agent, the water reducer, and the stabilizer are the same as those in Example 1.

[0021] According to GB / T25181-2019 "Ready-mixed Mortar", JGJ / T 70-2009 "Test Method for Basic Properties of Building Mortar", and JC / T 2326-2015 "Standard for Leveling Mortar for Construction", a series of experiments were carried out on the dry-mixed mortars obtained in Examples 1 to 3 and Comparative Examples 1 to 5, and the experimental data obtained are as follows:

[0022] Summary and Analysis: Compared with Example 1, Comparative Example 1 increased the amount of water-reducing agent, rubber powder, and stabilizer. Comparative Example 1 achieved better performance in terms of 2h consistency loss rate, pressure water bleeding rate, 14-day tensile bond strength, and 28-day compressive strength. However, Comparative Example 1's water retention rate, frost resistance, and anti-seepage rating were lower than those of Example 1. Furthermore, the dry-mix mortar obtained in Comparative Example 1 was very viscous after adding water, making it difficult to control the water consumption and resulting in large fluctuations in mortar workability. Compared with Example 1, Comparative Example 2 reduced the amount of expansion agent and fiber, resulting in better mortar workability and increased shrinkage. Compared with Example 1, Comparative Example 3 reduced the amount of hydrophobic agent and defoamer. Compared with Example 1, Comparative Example 4 reduced the amount of cement and calcium formate and increased the amount of marble. Although the 28-day shrinkage rates of Comparative Examples 2, 3, and 4 increased, their water retention, pressure water seepage rate, 14-day tensile bond strength, 3-day compressive strength, 28-day compressive strength, frost resistance, and anti-seepage rating were all inferior to those of Example 1. This indicates that the present invention's frost resistance, anti-seepage, and anti-pressure properties are superior to those of Comparative Examples 2 and 3. The water retention rate of Comparative Example 5 is essentially the same as that of Examples 1 to 3, but its frost resistance and anti-seepage rating are inferior to those of Examples 1 to 3. Compared with Comparative Examples 1 to 5, the multifunctional marble dry powder mortar of the present invention has a water retention rate of more than 97%, a setting time of less than 8.5 hours, a 2-hour viscosity loss rate of less than 15, a 14-day tensile bond strength of more than 0.4, a 28-day shrinkage rate of less than 0.06, a 28-day compressive strength of more than 43, a number of freeze-thaw cycles of more than 150 times, and an anti-seepage grade of P10, indicating that the present invention has good comprehensive performance in crack resistance, frost resistance, and waterproofing. During long-term use, it can better resist the erosion of the external environment and maintain good performance, thereby having higher durability and reducing the frequency of maintenance and replacement.

[0023] In the description of the present invention, it should be noted that the terms "center", "up", "down", "front", "back", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

Claims

1. Multifunctional marble dry powder mortar, characterized in that: The invention comprises, by weight, 360-440 parts of cement, 500-600 parts of marble, 20-35 parts of expansion agent, 0.5-0.9 parts of water reducing agent, 0.8-1.2 parts of rubber powder, 1.5-3 parts of water repellent, 0.3-0.6 parts of stabilizer, 3-5 parts of calcium formate, 0.3-0.5 parts of defoaming agent and 3-6 parts of fiber.

2. The multifunctional marble dry powder mortar according to claim 1, characterized in that: The cement is 42.5 grade cement.

3. The multifunctional marble dry powder mortar according to claim 1, characterized in that: The particle size of the marble is 0-5 mm.

4. The multifunctional marble dry powder mortar according to claim 1, characterized in that: The particle size of the marble is d, among which the marble with 0<d≤0.08mm accounts for 6-7 parts, the marble with 0.08<d≤0.63mm accounts for 29-31 parts, the marble with 0.63<d≤1.25mm accounts for 7-9 parts, the marble with 1.25<d≤2.5mm accounts for 16-18 parts, and the marble with 2.5<d≤5mm accounts for 34-35 parts.

5. The multifunctional marble dry powder mortar according to claim 1, characterized in that: The rubber powder is renewable latex powder with a solid content of more than 98% and a particle size of 100-600 μm.

6. The multifunctional marble dry powder mortar according to claim 1, characterized in that: The water repellent is a polysiloxane waterproofing agent.

7. The multifunctional marble dry powder mortar according to claim 1, characterized in that: The stabilizer is hydroxypropyl methylcellulose ether with a viscosity of 100,000.

8. The multifunctional marble dry powder mortar according to claim 1, characterized in that: The solid content of the calcium formate is above 99.8%.

9. The multifunctional marble dry powder mortar according to claim 1, characterized in that: The fibers are polypropylene fibers with a length of 15-20 mm.

10. The multifunctional marble dry powder mortar according to claim 1, characterized in that: The expansion agent is a U-shaped expansion agent.

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