Self-leveling mortar and preparation method thereof

Abstract

The invention relates to the technical field of mortar, and particularly discloses self-leveling mortar and a preparation method thereof. The self-leveling mortar is prepared from the following raw material components in parts by weight: 650 to 750 parts of cement, 150 to 250 parts of coal ash, 400 to 500 parts of fine sand, 400 to 500 parts of medium sand, 1 to 1.5 parts of a water reducing agent, 0.5 to 1.5 parts of a retarder, 0.001 to 0.003 part of a suspending agent, 0.001 to 0.002 part of a de-foaming agent and 280 to 350 parts of water, the water reducing agent comprises a mixture composed of a naphthalene water reducing agent and a polycarboxylic acid water reducing agent; the retarder comprises a mixture composed of sodium gluconate and white sugar. The preparation method of the self-leveling mortar comprises the following steps: stirring the cement, the coal ash, the fine sand and the medium sand to obtain a mixture; and adding a water reducing agent, a retarder, a suspending agent, a defoaming agent, water and other raw materials into the mixture, and stirring to obtain the self-leveling mortar.

Description

Technical Field

[0001] The present application relates to the technical field of mortar, and in particular to a self-leveling mortar and a preparation method thereof. Background Art

[0002] Mortar is a bonding material used for bricklaying in buildings. It is made of a certain proportion of sand and cementing materials and water. It is also called mortar or mortar. Common mortars include cement mortar, mixed mortar, lime mortar and clay mortar. With the development of the construction industry, the requirements for construction efficiency and quality are increasing. Commonly used mortars have poor fluidity and are prone to bubbles in actual use, resulting in uneven surfaces and low construction efficiency, which limits the use of mortars. Summary of the invention

[0003] In order to improve the fluidity and surface smoothness of mortar, the present application provides a self-leveling mortar and a preparation method thereof.

[0004] In the first aspect, the present application provides a self-leveling mortar, which adopts the following technical solution: A self-leveling mortar, wherein the raw materials of the mortar include the following components in parts by weight: 650-750 parts of cement, 150-250 parts of fly ash, 400-500 parts of fine sand, 400-500 parts of medium sand, 1-1.5 parts of water reducer, 0.5-1.5 parts of retarder, 0.001-0.003 parts of suspending agent, 0.001-0.002 parts of defoamer, and 280-350 parts of water; the water reducer includes a mixture of naphthalene water reducer and polycarboxylic acid water reducer; the retarder includes a mixture of sodium gluconate and white sugar.

[0005] By adopting the above technical scheme, the fluidity of the mortar is improved by using a composite water reducer composed of naphthalene-based water reducer and polycarboxylic acid water reducer, and a composite retarder composed of sodium gluconate and white sugar, in combination with a suspending agent; the addition of a defoaming agent reduces the generation of bubbles and improves the surface smoothness of the mortar.

[0006] In a specific embodiment, the suspending agent includes a mixture of bentonite and carboxymethyl cellulose.

[0007] By adopting the above technical solution and utilizing the composite suspending agent composed of bentonite and carboxymethyl cellulose, not only can better suspension performance be achieved, but also the construction stability of the mortar can be improved.

[0008] In a specific embodiment, the defoaming agent includes polyether-modified silicone oil.

[0009] In a specific possible implementation manner, the raw materials of the mortar further include 0.5 to 1.5 parts by weight of a shrinkage reducing agent, and the shrinkage reducing agent includes a mixture of wood fiber and calcium bicarbonate.

[0010] By adopting the above technical solution and adding a composite shrinkage reducing agent composed of wood fiber and calcium bicarbonate, the fluidity, stability and durability of the mortar can be further improved.

[0011] In a specific embodiment, the raw materials of the mortar further include 0.4 to 0.8 parts by weight of cellulose ether and 15 to 25 parts by weight of silica fume.

[0012] In a specific embodiment, the raw materials of the mortar further include 5 to 15 parts by weight of redispersible latex powder.

[0013] By adopting the above technical solution, the addition of cellulose ether, silica fume and redispersible latex powder can further improve the fluidity of the mortar.

[0014] In a specific embodiment, the raw materials of the mortar further include 5 to 10 parts by weight of a plasticizer, and the plasticizer includes one or more of polyvinyl alcohol, polyethylene glycol, and fatty acid methyl ester.

[0015] By adopting the above technical solution, the addition of polyvinyl alcohol, polyethylene glycol and fatty acid methyl ester can significantly improve the plasticity and fluidity of the mortar, making the mortar easier to construct and apply, while reducing the occurrence of cracks and hollowing.

[0016] In a specific implementation manner, the raw materials of the mortar further include 1.5 to 2.5 parts by weight of a water retaining agent, and the water retaining agent includes one or more of polyacrylamide, polyvinyl pyrrolidone, and sodium carboxymethyl starch.

[0017] By adopting the above technical solution, the addition of polyacrylamide, polyvinyl pyrrolidone and sodium carboxymethyl starch can effectively prevent the evaporation of water too quickly, keep the mortar moist during the construction process, and further improve the construction performance of the mortar.

[0018] In a specific implementation manner, the raw materials of the mortar further include 3 to 5 parts by weight of silicon dioxide, 3 to 5 parts by weight of aluminum oxide and 3 to 5 parts by weight of anti-cracking fibers.

[0019] In a second aspect, the present application provides a method for preparing a self-leveling mortar, which adopts the following technical solution: A method for preparing a self-leveling mortar comprises the following steps: Firstly, cement, fly ash, fine sand and medium sand are stirred and mixed evenly to obtain a mixture; Add water reducing agent, retarder, suspending agent, defoaming agent, water and other raw materials into the mixture, stir and mix evenly to obtain self-leveling mortar.

[0020] By adopting the above technical scheme, cement, fly ash, fine sand and medium sand are first mixed to obtain a mixture, and then a water reducer, a retarder, a suspending agent, a defoaming agent, water and other raw materials are added and stirred to obtain a self-leveling mortar with high fluidity and a smooth surface.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. In this application, a composite water reducer composed of a naphthalene-based water reducer and a polycarboxylate water reducer, and a composite retarder composed of sodium gluconate and white sugar are used, and a suspending agent is used to improve the fluidity of the mortar; the addition of a defoamer reduces the generation of bubbles and improves the surface smoothness of the mortar; 2. The composite suspending agent composed of bentonite and carboxymethyl cellulose used in this application can not only play a good suspension performance, but also improve the construction stability of the mortar; 3. The method of the present application first mixes cement, fly ash, fine sand and medium sand to obtain a mixture, then adds a water reducing agent, a retarder, a suspending agent, a defoaming agent, water and other raw materials, and mixes to obtain a self-leveling mortar with high fluidity and a smooth surface. DETAILED DESCRIPTION

[0022] The present application is further described in detail below with reference to the embodiments.

[0023] All raw materials in the embodiments can be obtained commercially. Cement is ordinary Portland cement, CAS No.: 1327-39-5; naphthalene water reducer is provided by Nantong Runfeng Petrochemical Co., Ltd., brand is Runfeng; polycarboxylic acid water reducer is provided by Shanghai Koraman Reagent Co., Ltd., brand is Kramar; plasticizer includes but is not limited to a mixture of one or more of polyvinyl alcohol, polyethylene glycol, and fatty acid methyl ester, preferably polyvinyl alcohol in this application; water retaining agent includes but is not limited to a mixture of one or more of polyacrylamide, polyvinyl pyrrolidone, and sodium carboxymethyl starch, preferably sodium carboxymethyl starch in this application. Example

[0024] Example 1 Embodiment 1 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 650kg of cement, 150kg of fly ash, 400kg of fine sand and 400kg of medium sand are stirred for 0.5min to obtain a mixture; wherein the particle size of the fly ash is 0.1-0.2mm; the particle size of the fine sand is 0.125-0.25mm; the particle size of the medium sand is 0.25-0.5mm; Add 1kg of water reducer, 0.5kg of retarder, 0.001kg of suspending agent, 0.001kg of defoamer and 280kg of water to the mixture and stir for 3min to obtain self-leveling mortar; wherein the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer, and the weight ratio of naphthalene water reducer and polycarboxylic acid water reducer is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate and white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite and carboxymethyl cellulose is 1:1; the defoamer is polyether modified silicone oil.

[0025] Example 2 Embodiment 2 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 700kg cement, 200kg fly ash, 450kg fine sand and 450kg medium sand were stirred for 0.5min to obtain a mixture; the particle size of the fly ash was 0.1-0.2mm; the particle size of the fine sand was 0.125-0.25mm; the particle size of the medium sand was 0.25-0.5mm; Add 1.25kg of water reducer, 1kg of retarder, 0.002kg of suspending agent, 0.0015kg of defoamer and 315kg of water to the mixture and stir for 3 minutes to obtain self-leveling mortar; wherein the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer, and the weight ratio of naphthalene water reducer and polycarboxylic acid water reducer is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate and white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite and carboxymethyl cellulose is 1:1; the defoamer is polyether modified silicone oil.

[0026] Example 3 Embodiment 3 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 750kg of cement, 250kg of fly ash, 500kg of fine sand and 500kg of medium sand are stirred for 0.5min to obtain a mixture; wherein the particle size of the fly ash is 0.1-0.2mm; the particle size of the fine sand is 0.125-0.25mm; the particle size of the medium sand is 0.25-0.5mm; Add 1.5kg of water reducer, 1.5kg of retarder, 0.003kg of suspending agent, 0.002kg of defoaming agent and 350kg of water to the mixture and stir for 3 minutes to obtain self-leveling mortar; wherein the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer, and the weight ratio of naphthalene water reducer and polycarboxylic acid water reducer is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate and white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite and carboxymethyl cellulose is 1:1; the defoaming agent is polyether modified silicone oil.

[0027] Example 4 The difference between Example 4 and Example 2 is that the suspending agent is bentonite; the remaining steps are consistent with Example 2.

[0028] Example 5 The difference between Example 5 and Example 2 is that the suspending agent is carboxymethyl cellulose; the remaining steps are consistent with Example 2.

[0029] Example 6 Embodiment 6 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 700kg cement, 200kg fly ash, 450kg fine sand and 450kg medium sand were stirred for 0.5min to obtain a mixture; the particle size of the fly ash was 0.1-0.2mm; the particle size of the fine sand was 0.125-0.25mm; the particle size of the medium sand was 0.25-0.5mm; Add 1.25kg of water reducer, 1kg of retarder, 0.002kg of suspending agent, 0.0015kg of defoamer, 1kg of shrinkage reducer and 315kg of water to the mixture and stir for 3 minutes to obtain self-leveling mortar; wherein the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer, and the weight ratio of naphthalene water reducer to polycarboxylic acid water reducer is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate to white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite to carboxymethyl cellulose is 1:1; the defoamer is polyether modified silicone oil; the shrinkage reducer is a mixture of wood fiber and calcium bicarbonate, and the weight ratio of wood fiber to calcium bicarbonate is 1:1.

[0030] Example 7 Embodiment 7 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 700kg cement, 200kg fly ash, 450kg fine sand and 450kg medium sand were stirred for 0.5min to obtain a mixture; the particle size of the fly ash was 0.1-0.2mm; the particle size of the fine sand was 0.125-0.25mm; the particle size of the medium sand was 0.25-0.5mm; Add 1.25kg of water reducer, 1kg of retarder, 0.002kg of suspending agent, 0.0015kg of defoamer, 1kg of shrinkage reducer, 0.6kg of cellulose ether, 20kg of silica fume and 315kg of water to the mixture and stir for 3 minutes to obtain self-leveling mortar; wherein the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer, and the weight ratio of naphthalene water reducer to polycarboxylic acid water reducer is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate to white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite to carboxymethyl cellulose is 1:1; the defoamer is polyether modified silicone oil; the shrinkage reducer is a mixture of wood fiber and calcium bicarbonate, and the weight ratio of wood fiber to calcium bicarbonate is 1:1.

[0031] Example 8 Embodiment 8 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 700kg cement, 200kg fly ash, 450kg fine sand and 450kg medium sand were stirred for 0.5min to obtain a mixture; the particle size of the fly ash was 0.1-0.2mm; the particle size of the fine sand was 0.125-0.25mm; the particle size of the medium sand was 0.25-0.5mm; Add 1.25kg of water reducer, 1kg of retarder, 0.002kg of suspending agent, 0.0015kg of defoamer, 1kg of shrinkage reducer, 0.6kg of cellulose ether, 20kg of silica fume, 10kg of redispersible latex powder and 315kg of water to the mixture and stir for 3 minutes to obtain self-leveling mortar; wherein the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer, and the weight ratio of naphthalene water reducer and polycarboxylic acid water reducer is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate and white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite and carboxymethyl cellulose is 1:1; the defoamer is polyether modified silicone oil; the shrinkage reducer is a mixture of wood fiber and calcium bicarbonate, and the weight ratio of wood fiber and calcium bicarbonate is 1:1.

[0032] Example 9 Embodiment 9 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 700kg cement, 200kg fly ash, 450kg fine sand and 450kg medium sand were stirred for 0.5min to obtain a mixture; the particle size of the fly ash was 0.1-0.2mm; the particle size of the fine sand was 0.125-0.25mm; the particle size of the medium sand was 0.25-0.5mm; Add 1.25kg water reducer, 1kg retarder, 0.002kg suspending agent, 0.0015kg defoamer, 1kg shrinkage reducer, 0.6kg cellulose ether, 20kg silica fume, 10kg redispersible latex powder, 7.5kg plasticizer and 315kg water to the mixture and stir for 3 minutes to obtain self-leveling mortar; wherein the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer, and the weight ratio of naphthalene water reducer and polycarboxylic acid water reducer is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate and white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite and carboxymethyl cellulose is 1:1; the defoamer is polyether modified silicone oil; the shrinkage reducer is a mixture of wood fiber and calcium bicarbonate, and the weight ratio of wood fiber and calcium bicarbonate is 1:1; the plasticizer is polyvinyl alcohol.

[0033] Example 10 Embodiment 10 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 700kg cement, 200kg fly ash, 450kg fine sand and 450kg medium sand were stirred for 0.5min to obtain a mixture; the particle size of the fly ash was 0.1-0.2mm; the particle size of the fine sand was 0.125-0.25mm; the particle size of the medium sand was 0.25-0.5mm; Add 1.25kg water reducer, 1kg retarder, 0.002kg suspending agent, 0.0015kg defoamer, 1kg shrinkage reducer, 0.6kg cellulose ether, 20kg silica fume, 10kg redispersible latex powder, 7.5kg plasticizer, 2kg water retaining agent and 315kg water to the mixture and stir for 3 minutes to obtain self-leveling mortar; wherein the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer, and the naphthalene water reducer and polycarboxylic acid water reducer are The weight ratio of the water-based agent is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate to white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite to carboxymethyl cellulose is 1:1; the defoaming agent is polyether modified silicone oil; the shrinkage reducing agent is a mixture of wood fiber and calcium bicarbonate, and the weight ratio of wood fiber to calcium bicarbonate is 1:1; the plasticizer is polyvinyl alcohol; and the water-retaining agent is sodium carboxymethyl starch.

[0034] Embodiment 11 Embodiment 11 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 700kg cement, 200kg fly ash, 450kg fine sand and 450kg medium sand were stirred for 0.5min to obtain a mixture; the particle size of the fly ash was 0.1-0.2mm; the particle size of the fine sand was 0.125-0.25mm; the particle size of the medium sand was 0.25-0.5mm; Add 1.25kg water reducer, 1kg retarder, 0.002kg suspending agent, 0.0015kg defoamer, 1kg shrinkage reducer, 0.6kg cellulose ether, 20kg silica fume, 10kg redispersible latex powder, 7.5kg plasticizer, 2kg water retainer, 4kg silicon dioxide, 4kg aluminum oxide, 4kg anti-cracking fiber, 315kg water to the mixture, stir for 3 minutes to obtain self-leveling mortar; the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer , and the weight ratio of naphthalene water reducer and polycarboxylic acid water reducer is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate and white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite and carboxymethyl cellulose is 1:1; the defoaming agent is polyether modified silicone oil; the shrinkage reducing agent is a mixture of wood fiber and calcium bicarbonate, and the weight ratio of wood fiber and calcium bicarbonate is 1:1; the plasticizer is polyvinyl alcohol; the water retaining agent is sodium carboxymethyl starch.

[0035] Comparative Example Comparative Example 1 Comparative Example 1 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 650kg of cement, 150kg of fly ash, 400kg of fine sand and 400kg of medium sand are stirred for 0.5min to obtain a mixture; wherein the particle size of the fly ash is 0.1-0.2mm; the particle size of the fine sand is 0.125-0.25mm; the particle size of the medium sand is 0.25-0.5mm; Add 1kg of water reducer, 0.5kg of retarder, 0.001kg of suspending agent, 0.001kg of defoaming agent and 280kg of water to the mixture and stir for 3 minutes to obtain self-leveling mortar; the water reducer is a naphthalene-based water reducer; the retarder is sodium gluconate; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite to carboxymethyl cellulose is 1:1; the defoaming agent is polyether modified silicone oil.

[0036] Comparative Example 2 Comparative Example 2 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 650kg of cement, 150kg of fly ash, 400kg of fine sand and 400kg of medium sand are stirred for 0.5min to obtain a mixture; wherein the particle size of the fly ash is 0.1-0.2mm; the particle size of the fine sand is 0.125-0.25mm; the particle size of the medium sand is 0.25-0.5mm; Add 1kg of water reducer, 0.5kg of retarder, 0.001kg of suspending agent, 0.001kg of defoaming agent and 280kg of water to the mixture and stir for 3 minutes to obtain self-leveling mortar; the water reducer is polycarboxylic acid water reducer; the retarder is white sugar; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite to carboxymethyl cellulose is 1:1; the defoaming agent is polyether modified silicone oil.

[0037] Comparative Example 3 Comparative Example 3 provides a method for preparing a self-leveling mortar, comprising the following steps: First, 650kg of cement, 150kg of fly ash, 400kg of fine sand and 400kg of medium sand are stirred for 0.5min to obtain a mixture; wherein the particle size of the fly ash is 0.1-0.2mm; the particle size of the fine sand is 0.125-0.25mm; the particle size of the medium sand is 0.25-0.5mm; Add 1kg of water reducer, 0.5kg of retarder, 0.001kg of suspending agent and 280kg of water to the mixture and stir for 3min to obtain self-leveling mortar; wherein the water reducer is a mixture of naphthalene water reducer and polycarboxylic acid water reducer, and the weight ratio of naphthalene water reducer to polycarboxylic acid water reducer is 1:1; the retarder is a mixture of sodium gluconate and white sugar, and the weight ratio of sodium gluconate to white sugar is 1:1; the suspending agent is a mixture of bentonite and carboxymethyl cellulose, and the weight ratio of bentonite to carboxymethyl cellulose is 1:1.

[0038] Performance testing Fluidity: Test the initial fluidity of the mortar. The higher the fluidity, the better the fluidity of the mortar.

[0039] Construction performance: Apply the mortar, then observe whether the surface is flat, and test the 28-day flexural strength.

[0040] Table 1 Performance test results of mortar In combination with Example 1 and Comparative Examples 1-3, the mortar in Example 1 has good fluidity, high strength, and a smooth surface. It can be seen that when preparing the self-leveling mortar, a composite water reducer composed of a naphthalene-based water reducer and a polycarboxylic acid water reducer, and a composite retarder composed of sodium gluconate and white sugar are selected, and a defoamer is added, which not only improves the fluidity of the mortar, but also reduces the generation of bubbles and improves the surface smoothness of the mortar.

[0041] In combination with Examples 1-3, the fluidity of the mortar in Example 2 is the best. It can be seen that when preparing the mortar, increasing the amount of raw materials used will result in the fluidity of the mortar showing a trend of first increasing and then decreasing.

[0042] Combining Example 2, Example 4 and Example 5, the fluidity of the mortar in Example 2 is the best. It can be seen that when preparing the mortar, the suspending agent is preferably a mixture of bentonite and carboxymethyl cellulose, and the fluidity of the obtained mortar is better.

[0043] Combining Example 2 and Example 6, the fluidity of the mortar in Example 6 is better. It can be seen that when preparing the mortar, adding a composite shrinkage reducing agent composed of wood fiber and calcium bicarbonate to the raw materials can further improve the fluidity of the mortar.

[0044] Combining Example 6 and Example 7, the fluidity of the mortar in Example 7 is better, which shows that when preparing the mortar, adding cellulose ether and silica fume to the raw materials can further improve the fluidity of the mortar.

[0045] Combining Example 7 and Example 8, the fluidity of the mortar in Example 8 is better. It can be seen that when preparing the mortar, adding redispersible latex powder to the raw materials can further improve the fluidity of the mortar.

[0046] Combining Example 8 and Example 9, the fluidity of the mortar in Example 9 is better. It can be seen that when preparing the mortar, adding plasticizer polyvinyl alcohol to the raw materials can further improve the fluidity of the mortar.

[0047] Combining Example 9 and Example 10, the fluidity of the mortar in Example 10 is better, which shows that when preparing the mortar, adding the water-retaining agent sodium carboxymethyl starch to the raw materials can further improve the fluidity of the mortar.

[0048] Combining Example 10 and Example 11, the flexural strength of the mortar in Example 11 is better. It can be seen that when preparing the mortar, adding silica, alumina, and anti-cracking fibers to the raw materials can further improve the flexural strength of the mortar.

[0049] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A self-leveling mortar, characterized in that: The raw materials of the mortar include the following components in parts by weight: 650-750 parts of cement, 150-250 parts of fly ash, 400-500 parts of fine sand, 400-500 parts of medium sand, 1-1.5 parts of water reducer, 0.5-1.5 parts of retarder, 0.001-0.003 parts of suspending agent, 0.001-0.002 parts of defoamer, and 280-350 parts of water; the water reducer includes a mixture of naphthalene-based water reducer and polycarboxylic acid water reducer; the retarder includes a mixture of sodium gluconate and white sugar.

2. A self-leveling mortar according to claim 1, characterized in that: The suspending agent comprises a mixture of bentonite and carboxymethyl cellulose.

3. The self-leveling mortar according to claim 1, characterized in that: The defoaming agent includes polyether modified silicone oil.

4. The self-leveling mortar according to claim 1, characterized in that: The raw materials of the mortar also include 0.5-1.5 parts by weight of a shrinkage reducer, which includes a mixture of wood fiber and calcium bicarbonate.

5. The self-leveling mortar according to claim 1, characterized in that: The raw materials of the mortar also include 0.4-0.8 parts by weight of cellulose ether and 15-25 parts by weight of silica fume.

6. The self-leveling mortar according to claim 5, characterized in that: The raw materials of the mortar also include 5 to 15 parts by weight of redispersible latex powder.

7. The self-leveling mortar according to claim 1, characterized in that: The raw materials of the mortar also include 5 to 10 parts by weight of a plasticizer, and the plasticizer includes one or more of polyvinyl alcohol, polyethylene glycol, and fatty acid methyl ester.

8. The self-leveling mortar according to claim 1, characterized in that: The raw materials of the mortar also include 1.5 to 2.5 parts by weight of a water retaining agent, and the water retaining agent includes one or more of polyacrylamide, polyvinyl pyrrolidone, and sodium carboxymethyl starch.

9. The self-leveling mortar according to claim 1, characterized in that: The raw materials of the mortar also include 3 to 5 parts by weight of silicon dioxide, 3 to 5 parts by weight of aluminum oxide and 3 to 5 parts by weight of anti-cracking fibers.

10. A method for preparing the self-leveling mortar according to any one of claims 1 to 9, characterized in that: The following steps are involved: Firstly, cement, fly ash, fine sand and medium sand are stirred and mixed evenly to obtain a mixture; Add water reducing agent, retarder, suspending agent, defoaming agent, water and other raw materials into the mixture, stir and mix evenly to obtain self-leveling mortar.

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