Additive for keeping concrete mortar not dispersed and flowing in water

Abstract

The invention discloses an additive capable of keeping concrete mortar not dispersed and flowing in water. The additive is prepared from the following raw materials in parts by weight: 30-50 parts of a polyacrylate polymer, 10-20 parts of a cellulose ether thickening agent, 5-15 parts of an organic silicon water repellent, 2-8 parts of a retarder and 3-10 parts of a dispersing agent. The polyacrylate polymer and the organic silicon water repellent have a synergistic effect, multiple layers of protective films can be formed on the surfaces of cement particles, dispersion of the cement particles in water is effectively prevented, and the uniformity and stability of concrete mortar can be guaranteed even in a complex water flow environment.

Description

Technical Field

[0001] The invention relates to the technical field of building material additives, in particular to an additive capable of keeping concrete mortar non-dispersible and fluid in water. Background Art

[0002] In underwater concrete projects, traditional concrete mortar is prone to cement particle dispersion and mortar segregation after entering the water due to the buoyancy and scouring effects of water, as well as the chemical reaction characteristics between cement particles and water. This leads to reduced concrete strength and poor density, seriously affecting the quality of the project. Currently, although there are some underwater non-dispersible concrete additives on the market, most of them have problems such as large additive dosage, high cost, adverse effects on the later strength development of concrete, or inability to effectively maintain the fluidity and non-dispersibility of concrete mortar in complex water flow environments. Therefore, the development of an efficient, low-cost non-dispersible flow additive for concrete mortar that can adapt to various underwater construction environments is of great practical significance. Summary of the Invention

[0003] The purpose of the present invention is to provide an additive that keeps concrete mortar non-dispersible and fluid in water. The additive can significantly improve the anti-dispersion performance of concrete mortar underwater at a relatively low dosage, while maintaining good fluidity, ensuring the uniformity and density of concrete during underwater construction, improving project quality, and reducing construction costs.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: An additive for keeping concrete mortar non-dispersible and fluid in water is composed of the following raw materials in parts by weight: 30-50 parts of polyacrylate polymer, 10-20 parts of cellulose ether thickener, 5-15 parts of organosilicon hydrophobic agent, 2-8 parts of retarder, and 3-10 parts of dispersant.

[0005] As a further improvement of the present technical solution: the polyacrylate polymer is one of sodium polyacrylate and potassium polyacrylate, or a mixture of the two.

[0006] As a further improvement of the present technical solution: the cellulose ether thickener is one of hydroxypropyl methylcellulose and sodium carboxymethyl cellulose, or a mixture of the two.

[0007] As a further improvement of the present technical solution: the organic silicon hydrophobic agent is one of sodium methyl silicate and potassium methyl silicate or a mixture of the two.

[0008] As a further improvement of the present technical solution: the retarder is sodium gluconate, sucrose or a mixture of the two.

[0009] As a further improvement of the present technical solution: the dispersant is one of sodium tripolyphosphate and sodium hexametaphosphate, or a mixture of the two.

[0010] As a further improvement of the technical solution: it is composed of the following raw materials in parts by weight: 40 parts of polyacrylate polymer, 15 parts of cellulose ether thickener, 10 parts of silicone hydrophobic agent, 5 parts of retarder, and 6 parts of dispersant.

[0011] As a further improvement of the present technical solution: it is composed of the following raw materials in parts by weight: 35 parts of polyacrylate polymer, 18 parts of cellulose ether thickener, 8 parts of silicone hydrophobic agent, 3 parts of retarder, and 8 parts of dispersant.

[0012] As a further improvement of the present technical solution: it is composed of the following raw materials in parts by weight: 45 parts of polyacrylate polymer, 12 parts of cellulose ether thickener, 12 parts of silicone hydrophobic agent, 7 parts of retarder, and 5 parts of dispersant.

[0013] As a further improvement of the present technical solution: the preparation method of the additive comprises the following steps: according to the above-mentioned parts by weight, polyacrylate polymer, cellulose ether thickener, silicone hydrophobic agent, retarder and dispersant are added to a stirring kettle in sequence, and stirred at a speed of 200-300 r / min at room temperature for 30-60 minutes to fully mix the components to obtain the additive.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The polyacrylate polymer and silicone hydrophobic agent in this additive work synergistically to form a multi-layer protective film on the surface of cement particles, effectively preventing the dispersion of cement particles in water, and ensuring the uniformity and stability of concrete mortar even in complex water flow environments.

[0015] 2. The reasonable combination of cellulose ether thickeners and dispersants enables the concrete mortar to have good fluidity while maintaining a certain viscosity, which facilitates transportation, pouring and vibration during underwater construction and improves construction efficiency.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the description, the following preferred embodiments of the present invention are described in detail with reference to the accompanying drawings. The specific implementation methods of the present invention are given in detail by the following embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A schematic diagram of the preparation of an additive for keeping concrete mortar non-dispersible and fluid in water, proposed by the present invention; Figure 2 This is a schematic diagram of the microstructure of the adsorption film formed by the polyacrylate polymer in this additive on the surface of cement particles. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples provided are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and are not to exact scale, and are only used for the purpose of conveniently and clearly illustrating the embodiments of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] An additive for keeping concrete mortar non-dispersible and fluid in water, comprising the following raw materials in parts by weight: Polyacrylate polymer: 30-50 parts. Polyacrylate polymers are either sodium polyacrylate or potassium polyacrylate, or a mixture of both. Polyacrylate polymers have a long chain structure that forms a dense adsorption film on the surface of cement particles, preventing direct contact between the cement particles and water, thereby effectively inhibiting the dispersion of cement particles in water. Furthermore, functional groups such as carboxyl groups on their molecular chains chemically react with cement hydration products, strengthening the binding force between the additive and the cement matrix, further improving the anti-dispersion properties of the concrete mortar.

[0021] Cellulose ether thickener: 10-20 parts. Cellulose ether thickeners are either hydroxypropyl methylcellulose or sodium carboxymethylcellulose, or a mixture of both. Cellulose ether thickeners increase the viscosity of concrete mortar, improving its rheological properties and maintaining good fluidity in water. They prevent sedimentation and segregation of cement particles by creating steric hindrance and physical entanglement between cement particles, ensuring uniformity in the concrete mortar.

[0022] Silicone hydrophobic agent: 5-15 parts. This is either sodium methyl silicate or potassium methyl silicate, or a mixture of both. Silicone hydrophobic agent forms a hydrophobic film on the surface of concrete mortar, reducing water absorption and minimizing water erosion and scouring. The hydrophobic film also helps improve the mortar's anti-dispersion properties, preventing cement particles from being carried away by water.

[0023] Retarder: 2-8 parts. The retarder is either sodium gluconate or sucrose, or a mixture of both. Retarders slow the hydration reaction of cement, allowing the concrete mortar to maintain good working properties for a longer period of time. During underwater construction, this helps ensure sufficient time for mortar transportation, pouring, and vibration, avoiding loss of mortar fluidity and excessive early strength due to overly rapid cement hydration, which can affect construction operations.

[0024] Dispersant: 3-10 parts. The dispersant is either sodium tripolyphosphate or sodium hexametaphosphate, or a mixture of the two. Dispersants reduce the surface tension between cement particles, allowing them to disperse better in water, improving the fluidity and uniformity of the concrete mortar. This helps reduce the amount of additives used while ensuring the mortar's workability in complex water flow environments.

[0025] Example 1 The raw materials were weighed according to the following weight parts: 40 parts of polyacrylate polymer, 15 parts of cellulose ether thickener, 10 parts of silicone hydrophobic agent, 5 parts of retarder, and 6 parts of dispersant.

[0026] The above raw materials were added into a stirring kettle in sequence, and stirred at a rotation speed of 250 r / min at room temperature for 45 minutes to obtain the non-dispersible flow additive for concrete mortar of the present invention.

[0027] The prepared additive was added to the concrete mortar at a rate of 3% of the cement content, mixed evenly, and then subjected to underwater pouring tests. The test results showed that the concrete mortar maintained good fluidity and anti-dispersion properties during underwater construction, and the strength of the poured concrete specimens met the design requirements.

[0028] Example 2 The raw materials were weighed according to the following weight parts: 35 parts of polyacrylate polymer, 18 parts of cellulose ether thickener, 8 parts of silicone hydrophobic agent, 3 parts of retarder, and 8 parts of dispersant.

[0029] The additive was prepared according to the preparation method of Example 1 and added to the concrete mortar at 2.5% of the cement dosage. The underwater pouring test results showed that the concrete mortar had excellent fluidity and anti-dispersion properties, and the late strength of the concrete specimens developed well.

[0030] Example 3 The raw materials were weighed according to the following weight parts: 45 parts of polyacrylate polymer, 12 parts of cellulose ether thickener, 12 parts of silicone hydrophobic agent, 7 parts of retarder, and 5 parts of dispersant.

[0031] The additive was prepared in the same manner as in Example 1, with the added amount being 3.5% of the cement amount. Underwater construction tests showed that the concrete mortar could maintain good working performance in a complex water flow environment, and the concrete quality was reliable.

[0032] The results of the underwater casting tests of Examples 1, 2, and 3 are shown in the following table: The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in this industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. An additive for keeping concrete mortar non-dispersible and fluid in water, characterized in that: The invention is composed of the following raw materials in parts by weight: 30-50 parts of polyacrylic acid salt polymer, 10-20 parts of cellulose ether thickener, 5-15 parts of organic silicon hydrophobic agent, 2-8 parts of retarder and 3-10 parts of dispersant.

2. The additive for keeping concrete mortar non-dispersible and fluid in water according to claim 1, characterized in that: The polyacrylate polymer is one of sodium polyacrylate and potassium polyacrylate or a mixture of the two.

3. The additive for keeping concrete mortar non-dispersible and fluid in water according to claim 1, characterized in that: The cellulose ether thickener is one of hydroxypropyl methylcellulose and sodium carboxymethyl cellulose or a mixture of the two.

4. The additive for keeping concrete mortar non-dispersible and fluid in water according to claim 1, characterized in that: The organic silicon water repellent is one of sodium methyl silicate and potassium methyl silicate or a mixture of the two.

5. The additive for keeping concrete mortar non-dispersible and fluid in water according to claim 1, characterized in that: The retarder is one of sodium gluconate and sucrose or a mixture of the two.

6. The additive for keeping concrete mortar non-dispersible and fluid in water according to claim 1, characterized in that: The dispersant is one of sodium tripolyphosphate and sodium hexametaphosphate or a mixture of the two.

7. The additive for keeping concrete mortar non-dispersible and fluid in water according to claim 1, characterized in that: The invention is composed of the following raw materials in parts by weight: 40 parts of polyacrylate polymer, 15 parts of cellulose ether thickener, 10 parts of organosilicon hydrophobic agent, 5 parts of retarder and 6 parts of dispersant.

8. The additive for keeping concrete mortar non-dispersible and fluid in water according to claim 1, characterized in that: The invention is composed of the following raw materials in parts by weight: 35 parts of polyacrylate polymer, 18 parts of cellulose ether thickener, 8 parts of organosilicon hydrophobic agent, 3 parts of retarder and 8 parts of dispersant.

9. The additive for keeping concrete mortar non-dispersible and fluid in water according to claim 1, characterized in that: The invention is composed of the following raw materials in parts by weight: 45 parts of polyacrylate polymer, 12 parts of cellulose ether thickener, 12 parts of organosilicon hydrophobic agent, 7 parts of retarder and 5 parts of dispersant.

10. The additive for making concrete mortar non-dispersible and fluid in water according to claim 1, characterized in that: The preparation method of the additive comprises the following steps: adding polyacrylate polymer, cellulose ether thickener, silicone hydrophobic agent, retarder and dispersant in the above-mentioned proportions by weight into a stirring kettle in sequence, stirring at a speed of 200-300 r / min for 30-60 minutes at room temperature to fully mix the components, thereby obtaining the additive.

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