A composite liquid early strength agent for white portland cement

Abstract

The present application relates to white cement admixture technical field, specifically to a kind of composite liquid early strength agent of white Portland cement, including the following weight parts of raw material, reinforcing component 30~40 parts, auxiliary solubilization stabilizing component 5~10 parts and carrier 50~65 parts, the total part of the composite liquid early strength agent is 100 parts, the reinforcing component is organic salt, inorganic salt reinforcing agent, the organic salt, inorganic salt reinforcing agent includes sodium oxalate, sodium carbonate and magnesium fluorosilicate, the auxiliary solubilization stabilizing component is the mixture of lignosulfonate and polyglycerol, the lignosulfonate is sodium lignosulfonate, and the polyglycerol is triglycerol, the composite liquid admixture of the present application, environmental friendly, preparation process is simple, improve white cement early (3d) strength 10%~15%, save white cement product curing time and improve formwork turnover rate.

Description

Technical Field

[0001] This invention relates to the field of white cement admixtures, specifically to a composite liquid early-strength agent for white silicate cement. Background Technology

[0002] White silicate cement (white cement) is a hydraulic cementitious material made by calcining raw materials of appropriate composition until partial melting, resulting in silicate cement clinker with calcium silicate as the main component and low iron oxide content, and then adding appropriate amounts of limestone, dolomitic limestone, quartz sand, and gypsum, which are then finely ground. Due to its low iron oxide content and high calcium silicate content, white cement possesses characteristics of whiteness and high later-stage strength, and is widely used in decoration and renovation projects, artificial marble slabs, and the production of various colored terrazzo products. It can also be used to produce some white and colored concrete components. With the progress and development of science and technology and the economy, the demand for the performance and visual effects of building surface decoration materials will continue to increase. White cement, as a masterbatch for high-end decorative materials, has wide applications. However, due to its relatively low C4AF and C3A content, it suffers from a lower early-stage strength. Artificial cement-based marble is made by using crushed natural marble or granite as filler, white cement, kaolin as binder, various grades of quartz sand, and pigments, etc., and then mixing, molding, curing, cutting, grinding, and polishing the mixture. The mass production of artificial marble requires that the freshly formed artificial marble have good early strength at room temperature and a curing temperature of 40-50℃ in order to complete subsequent processes such as cutting, grinding and polishing. White cement used in decoration projects and mass production of artificial marble also requires good early strength.

[0003] Traditional organic alcohol amine reinforcing agents, represented by triethanolamine (TEA) and triisopropanolamine (TIPA), are mainly used to improve the hydration of aluminate (ferrate) in ordinary silicate cement. However, the main mineral components of white cement are silicate C3S and C2S. Therefore, traditional TEA and TIPA organic reinforcing agents are not suitable for reinforcing white cement. Currently, there is little research on admixtures to improve the early and late strength of white cement. Some studies have shown that by interacting with calcium ions through the interaction of organophosphonic acids and phosphonates with strong chelating properties, the concentration of soluble calcium ions in the hydrated paste of white cement can be increased, thereby promoting the dissolution and hydration rate of white cement mineral components and thus improving the early strength of white cement. Other studies have shown that by compounding ethylenediaminetetraacetate, alcohol amines, monophosphate esters, thiocyanate and molasses, the early strength of white cement can be improved through complexation. However, these inventions have problems such as high cost and homogeneity stability of liquid products.

[0004] Therefore, this invention studies a liquid admixture that has good homogeneity and stability, is easy to measure and use, and significantly improves the early strength of white silicate cement, which plays an important role in promoting the development of white cement application technology. Summary of the Invention

[0005] (1) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a composite liquid early-strength agent for white silicate cement, solving problems such as high cost and poor homogeneity and stability of liquid products in existing technologies.

[0007] (2) Technical solution

[0008] To solve the above-mentioned technical problems, the present invention provides a composite liquid early strength agent for white silicate cement, comprising the following raw materials in parts by weight: 30-40 parts of reinforcing component, 5-10 parts of auxiliary solubilizing and stabilizing component, and 50-65 parts of carrier, wherein the total number of parts of the composite liquid early strength agent is 100 parts.

[0009] The preparation method of the composite liquid early strength agent is as follows:

[0010] The reinforcing component and the auxiliary solubilizing and stabilizing component are added to the carrier in sequence and mixed evenly by high-speed stirring to obtain the composite liquid early strength agent;

[0011] The reinforcing components are organic salts and inorganic salt reinforcing agents.

[0012] As a preferred embodiment of the present invention, the organic salt and inorganic salt reinforcing agent includes sodium oxalate, sodium carbonate, and magnesium fluorosilicate.

[0013] As a preferred embodiment of the present invention, the mass ratio of sodium oxalate: sodium carbonate: magnesium fluorosilicate is (2-4):(1-3):(2-3).

[0014] As a preferred embodiment of the present invention, the auxiliary solubilizing and stabilizing component is a mixture of lignin sulfonate and polyglycerol.

[0015] In a preferred embodiment of the present invention, the lignin sulfonate is sodium lignin sulfonate, and the polymeric glycerol is triglyceride.

[0016] In a preferred embodiment of the present invention, the mass ratio of sodium lignosulfonate to triglycerides is (3-4):1.

[0017] In a preferred embodiment of the present invention, the carrier is water.

[0018] As a preferred embodiment of the present invention, the solid content of the composite liquid early strength agent is 35% to 50%, and the composite liquid early strength agent increases the three-day early strength of white silicate cement by 10% to 15%.

[0019] As a preferred embodiment of the present invention, the mass content of the composite liquid early strength agent in white silicate cement is 3% to 4%.

[0020] As a preferred embodiment of the present invention, the pH value of the composite liquid early strength agent is 7 to 10.

[0021] (3) Beneficial effects

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] This invention utilizes the fact that sodium oxalate in organic and inorganic salt reinforcing agents can react with calcium hydroxide, a product of white cement hydration, to form calcium oxalate precipitate. This forward shift in chemical equilibrium accelerates the dissolution rate of calcium silicate hydrate (CSH), increasing the solid phase ratio in the paste and promoting the rapid formation of the cement stone structure. Sodium carbonate can also react with calcium hydroxide, another product of white cement hydration, to form calcium carbonate precipitate, reducing the calcium hydroxide concentration and promoting the forward hydration reaction, thereby accelerating the white cement hydration process, shortening the setting time, and increasing cement strength. Furthermore, magnesium fluorosilicate can chemically react with calcium ions, another product of white cement hydration, to form a water-insoluble substance—calcium fluorosilicate (C5H2O). FSS promotes further hydration of white cement and improves its early strength. In addition, calcium fluorosilicate is a very dense crystal that can improve the hardness of cement products. Magnesium fluorosilicate can also eliminate the crystallization and precipitation of inorganic salt crystals from white cement products. The above three reinforcing agents can work in unison, promote each other, and complement each other's advantages, significantly improving the dissolution rate and hydration degree of white cement minerals in water, thereby improving the early (3d) strength of white cement. At the same time, in order to prevent the stratification and crystallization of organic and inorganic salts in the aqueous solution, lignin sulfonate and triglycerides are added to the aqueous solution to ensure the homogeneity and stability of the liquid early strength agent.

[0024] The composite liquid admixture of the present invention is highly environmentally friendly, has a simple preparation process, significantly improves the early strength of white cement, saves the curing time of white cement products, and improves the turnover rate of templates. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0026] The specific raw materials mentioned in the following examples are all commercially available, and the technologies and equipment used are well known to those skilled in the art.

[0027] This invention provides a technical solution:

[0028] A composite liquid early-strength agent for white silicate cement comprises the following raw materials in parts by weight: 30-40 parts of reinforcing component, 5-10 parts of auxiliary solubilizing and stabilizing component, and 50-65 parts of carrier, with a total of 100 parts of composite liquid early-strength agent; wherein, the reinforcing component is an organic salt and an inorganic salt reinforcing agent, the organic salt and inorganic salt reinforcing agent including sodium oxalate, sodium carbonate, and magnesium fluorosilicate, the mass ratio of sodium oxalate:sodium carbonate:magnesium fluorosilicate is (2-4):(1-3):(2-3); the auxiliary solubilizing and stabilizing component is a mixture of lignin sulfonate and polyglycerol, the lignin sulfonate is sodium lignin sulfonate, the polyglycerol is triglyceride, the mass ratio of sodium lignin sulfonate:triglyceride is (3-4):1; the carrier is water.

[0029] The preparation method of the composite liquid early strength agent is as follows:

[0030] First, add the carrier to the mixing vessel according to the weight proportions. Then, add the reinforcing component and the auxiliary solubilizing and stabilizing component to the mixing vessel in sequence according to the weight proportions. Mix the reinforcing component and the auxiliary solubilizing and stabilizing component with the carrier by high-speed stirring in the mixing vessel to obtain the composite liquid early strength agent.

[0031] In this embodiment, the solid content of the composite liquid early strength agent is 35% to 50%, and the composite liquid early strength agent increases the three-day early strength of white silicate cement by 10% to 15%.

[0032] In this embodiment, the mass content of the composite liquid early strength agent in the white silicate cement is 3% to 4%.

[0033] In this embodiment, the pH value of the composite liquid early strength agent is 7-10.

[0034] It should be noted that sodium oxalate, sodium carbonate, magnesium fluorosilicate, sodium lignosulfonate, and triglycerides in the following examples are all commercially available industrial-grade chemicals.

[0035] When using various types of water-reducing agents, the amount of water used in white cement products should be reduced by the amount of water introduced into the composite liquid early-strength agent.

[0036] Specific Implementation Cases

[0037] Example 1

[0038] By weight: take 15 parts of sodium oxalate, 5 parts of sodium carbonate, 10 parts of magnesium fluorosilicate, and 5 parts of auxiliary solubilizing and stabilizing components (of which, 3.75 parts of sodium lignosulfonate and 1.25 parts of triglycerides) and add them to 65 parts of water in sequence. Stir at high speed and mix evenly to obtain the composite liquid early strength agent.

[0039] Example 2

[0040] By weight: Take 20 parts of sodium oxalate, 5 parts of sodium carbonate, 15 parts of magnesium fluorosilicate, and 10 parts of auxiliary solubilizing and stabilizing components (of which, sodium lignosulfonate 7.5 parts and triglycerides 2.5 parts) and add them to 50 parts of water in sequence. Stir at high speed and mix evenly to obtain the composite liquid early strength agent.

[0041] Example 3

[0042] By weight: take 10 parts of sodium oxalate, 10 parts of sodium carbonate, 15 parts of magnesium fluorosilicate, and 8 parts of auxiliary solubilizing and stabilizing components (including 6 parts of sodium lignosulfonate and 2 parts of triglycerides) and add them to 57 parts of water. Stir at high speed to mix evenly to obtain the composite liquid early strength agent.

[0043] Example 4

[0044] By weight: Take 20 parts of sodium oxalate, 10 parts of sodium carbonate, 10 parts of magnesium fluorosilicate, and 6 parts of auxiliary solubilizing and stabilizing components (of which 4.5 parts of sodium lignosulfonate and 1.5 parts of triglycerides) and add them to 54 parts of water in sequence. Stir at high speed and mix evenly to obtain the composite liquid early strength agent.

[0045] Example 5

[0046] By weight: Take 15 parts of sodium oxalate, 15 parts of sodium carbonate, 10 parts of magnesium fluorosilicate, and 10 parts of auxiliary solubilizing and stabilizing components (of which, 7.5 parts of sodium lignosulfonate and 2.5 parts of triglycerides) and add them to 50 parts of water in sequence. Stir at high speed and mix evenly to obtain the composite liquid early strength agent.

[0047] Example 6

[0048] By weight: Take 10 parts of sodium oxalate, 15 parts of sodium carbonate, 15 parts of magnesium fluorosilicate, and 7 parts of auxiliary solubilizing and stabilizing components (including 5.25 parts of sodium lignosulfonate and 1.75 parts of triglycerides) and add them to 53 parts of water. Stir at high speed to mix evenly to obtain the composite liquid early strength agent.

[0049] Example 7

[0050] By weight: take 15 parts of sodium oxalate, 5 parts of sodium carbonate, 10 parts of magnesium fluorosilicate, and 5 parts of auxiliary solubilizing and stabilizing components (of which: 4 parts of sodium lignosulfonate and 1 part of triglyceride) and add them to 65 parts of water in sequence. Stir at high speed and mix evenly to obtain the composite liquid early strength agent.

[0051] Example 8

[0052] By weight: Take 20 parts of sodium oxalate, 5 parts of sodium carbonate, 15 parts of magnesium fluorosilicate, and 10 parts of auxiliary solubilizing and stabilizing components (including 8 parts of sodium lignosulfonate and 2 parts of triglycerides) and add them to 50 parts of water. Stir at high speed to mix evenly to obtain the composite liquid early strength agent.

[0053] Example 9

[0054] By weight: Take 10 parts of sodium oxalate, 10 parts of sodium carbonate, 15 parts of magnesium fluorosilicate, and 8 parts of auxiliary solubilizing and stabilizing components (of which 6.4 parts of sodium lignosulfonate and 1.6 parts of triglycerides) and add them to 57 parts of water. Stir at high speed to mix evenly to obtain the composite liquid early strength agent.

[0055] Example 10

[0056] By weight: Take 20 parts of sodium oxalate, 10 parts of sodium carbonate, 10 parts of magnesium fluorosilicate, and 6 parts of auxiliary solubilizing and stabilizing components (of which, 4.8 parts of sodium lignosulfonate and 1.2 parts of triglycerides) and add them to 54 parts of water in sequence. Stir at high speed to mix evenly to obtain the composite liquid early strength agent.

[0057] Example 11

[0058] By weight: take 15 parts of sodium oxalate, 15 parts of sodium carbonate, 10 parts of magnesium fluorosilicate, and 10 parts of auxiliary solubilizing and stabilizing components (of which 8 parts of sodium lignosulfonate and 2 parts of triglycerides) and add them to 50 parts of water in sequence. Stir at high speed and mix evenly to obtain the composite liquid early strength agent.

[0059] Example 12

[0060] By weight: Take 10 parts of sodium oxalate, 15 parts of sodium carbonate, 15 parts of magnesium fluorosilicate, and 7 parts of auxiliary solubilizing and stabilizing components (including 5.6 parts of sodium lignosulfonate and 1.4 parts of triglycerides) and add them to 53 parts of water. Stir at high speed to mix evenly to obtain the composite liquid early strength agent.

[0061] Enhancement effect test

[0062] The composite liquid early-strength agents prepared in Examples 1 to 12 were added to the same white cement, maintaining the same water-cement ratio and cement-sand ratio (note the deduction of water from the liquid reinforcing agent). The mortar was molded, cured, and its 3-day and 28-day compressive strengths were tested according to GB / T 17671 "Test Method for Strength of Cement Mortar". The chemical composition of the P.W52.5 grade white cement produced by Alboportland Ltd. is shown in Table 1 (as Comparative Example 1), and the obtained 3-day and 28-day mortar strength results are shown in Table 2.

[0063] Table 1. Chemical composition (%) of P.W52.5 grade white cement produced by Alboportland Ltd.

[0064]

[0065] Table 2. Effect of the composite liquid early-strength agent prepared in this invention on the strength of white cement mortar (MPa)

[0066]

[0067] As can be seen from Table 2, the composite liquid early strength agent prepared by the present invention can be used in the production of white silicate cement products. The production process of this admixture is relatively simple and the production cost is low. It can improve the early strength of white cement by 10% to 15% in three days and improve the turnover efficiency of white cement product templates.

[0068] All technical features in this embodiment can be freely combined according to actual needs.

[0069] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

Claims

1. A composite liquid early-strength agent for white silicate cement, characterized in that, The raw materials include the following parts by weight: 30-40 parts of reinforcing component, 5-10 parts of auxiliary solubilizing and stabilizing component, and 50-65 parts of carrier, and the total number of parts of the composite liquid early strength agent is 100 parts; The preparation method of the composite liquid early strength agent is as follows: The reinforcing component and the auxiliary solubilizing and stabilizing component are added to the carrier in sequence and mixed evenly by high-speed stirring to obtain the composite liquid early strength agent; The reinforcing components are organic salts and inorganic salt reinforcing agents; The organic and inorganic salt reinforcing agents include sodium oxalate, sodium carbonate, and magnesium fluorosilicate. The mass ratio of sodium oxalate: sodium carbonate: magnesium fluorosilicate is (2-4):(1-3):(2-3); The auxiliary solubilizing and stabilizing component is a mixture of lignin sulfonate and polyglycerol; The carrier is water.

2. The composite liquid early-strength agent for white silicate cement according to claim 1, characterized in that, The lignin sulfonate is sodium lignin sulfonate, and the polymeric glycerol is triglyceride.

3. The composite liquid early-strength agent for white silicate cement according to claim 2, characterized in that, The mass ratio of sodium lignosulfonate to triglycerides is (3-4):

1.

4. The composite liquid early-strength agent for white silicate cement according to claim 1, characterized in that, The solid content of the composite liquid early strength agent is 35% to 50%, and the composite liquid early strength agent increases the three-day early strength of white silicate cement by 10% to 15%.

5. The composite liquid early-strength agent for white silicate cement according to claim 1, characterized in that, The mass dosage of the composite liquid early strength agent in white silicate cement is 3% to 4%.

6. The composite liquid early-strength agent for white silicate cement according to claim 1, characterized in that, The pH value of the composite liquid early strength agent is 7-10.

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