A concrete surface enhancer and its preparation method and application

Abstract

The present invention relates to a kind of concrete surface enhancer and its preparation method and application, the concrete surface enhancer includes the following raw materials in percentage by mass: organosilicon resin 15%-24%, filling powder 12%-35%, latex powder 2%-5%, sodium sulfate 4%-8%, admixture 0.3%-3%, water 30%-56%, the filling powder is a modified titanium dioxide powder with a core-shell structure and a modified kudzu fiber powder according to a mass ratio of 1: (0.8-1.5) mixed; the modified titanium dioxide powder is a titanium dioxide powder as a core, a coumarone resin as a core-shell, and a porous structure on the core-shell. The present invention prepares a concrete surface enhancer by utilizing filling powder instead of organosilicon resin. The concrete surface treated with the concrete surface enhancer has better compressive strength than an untreated concrete surface, and also has good anti-penetration effect, anti-carbonization effect, and good antifreeze effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete adjuvants, and in particular relates to a concrete surface enhancer and a preparation method and application thereof. Background Art

[0002] Insufficient concrete surface strength is a common concrete problem. This can negatively impact a structure's load-bearing capacity and durability, among other aspects. This can be caused by a variety of factors, including improper concrete curing in the natural environment, which can lead to surface dehydration due to evaporation, insufficient hydration, and a porous surface. Alternatively, concrete structures can be exposed to the elements year-round, allowing water, soluble salts, and acidic gases like sulfur dioxide from the air to enter the concrete through its pores, leading to a reduction in surface strength and significantly reduced durability.

[0003] In the prior art, to solve the above-mentioned problems, after the concrete surface construction is completed, a concrete surface enhancer can generally be evenly applied on the concrete surface using a low-pressure nozzle spray, roller, or brush. Concrete surface enhancers include inorganic salt type and organic emulsion type. Among them, if the organic emulsion type concrete surface enhancer contains a large amount of organic resin, its fluidity is poor, it is not easy to flow into the gaps inside the concrete, and it cannot fully adhere to the wall surface of the concrete gap, and its durability is poor. If the amount of organic resin used is small, the enhancement effect is poor. Therefore, to solve the above-mentioned technical problems, we propose a concrete surface enhancer, a preparation method, and an application thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a concrete surface enhancer and its preparation method and application in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A concrete surface enhancer comprises the following raw materials in percentage by mass: 15%-24% organic silicone resin, 12%-35% filler powder, 2%-5% latex powder, 4%-8% sodium sulfate, 0.3%-3% admixture, and 30%-56% water. The filler powder is a mixture of modified titanium dioxide powder having a core-shell structure and modified kudzu fiber powder in a mass ratio of 1:(0.8-1.5).

[0007] The modified titanium dioxide powder has titanium dioxide powder as the core and coumarone resin as the core-shell, and the core-shell has a porous structure;

[0008] The modified kudzu fiber powder is obtained by mixing kudzu fiber with kudzu root powder after the kudzu fiber is subjected to hydrothermal treatment, alkali treatment, drying and pulverization treatment.

[0009] As a further optimized solution of the present invention, the organosilicon resin is any one or more of organosilane, silicate and siloxane.

[0010] As a further optimized solution of the present invention, the admixture is any one or more of polyoxypropylene polyoxyethylene glycerol ether and emulsified silicone oil.

[0011] A method for preparing a concrete surface enhancer, comprising the following steps:

[0012] Step 1: Prepare modified titanium dioxide powder, spray coumarone resin solution on the outer surface of the titanium dioxide powder, constantly stir during spraying, vitrify the coumarone resin at a temperature of 50°C-60°C, and spray diamond micropowder onto the vitrified coumarone resin under high pressure. After curing, remove the diamond micropowder through ultrasonic vibration to obtain a porous structure on the core-shell formed by the coumarone resin. The prepared modified titanium dioxide powder is collected for later use;

[0013] Step 2: preparing modified kudzu fiber powder, soaking the kudzu fiber in hot water at 80-90°C for 2-3 hours, kneading it repeatedly during the soaking process, wringing out the water, and ultrasonically treating it at 60-70°C for 15-25 minutes, and then drying and crushing it for later use;

[0014] Step 3: Ultrasonic mixing the modified titanium dioxide powder prepared in step 1 and the modified kudzu fiber powder prepared in step 2 according to the mass ratio to obtain filling powder;

[0015] Step 4: Mix the silicone resin, the filling powder prepared in step 3, latex powder, sodium sulfate, admixture, and water in a certain mass ratio, and let it stand at 25°C ± 2°C for 24 hours to obtain a concrete surface enhancer.

[0016] As a further optimization solution of the present invention, in step 2, the kneading frequency is 15-45 times / min, and the ultrasonic treatment is stirring at 1200-1500 r / min.

[0017] A concrete surface enhancer is used in concrete. The concrete surface enhancer is coated on the concrete surface, and the concrete surface is put into use after being cured for 5-8 days.

[0018] As a further optimization solution of the present invention, the dosage of the concrete surface enhancer is 0.3-0.6 kg / m 2 .

[0019] The beneficial effects of the present invention are:

[0020] The present invention uses filler powder instead of silicone resin to prepare a concrete surface enhancer. Compared with untreated concrete surfaces, the concrete surface treated with the concrete surface enhancer has better compressive strength, good anti-penetration effect, anti-carbonization effect, and good anti-freeze effect.

[0021] The filling powder in the present invention is obtained by mixing modified titanium dioxide powder and modified kudzu fiber powder. The modified titanium dioxide powder and modified kudzu fiber powder are used in combination to significantly improve the compressive strength, anti-penetration effect, anti-carbonization effect and anti-freeze effect of the concrete surface treated with the concrete surface enhancer.

[0022] The present invention uses diamond micropowder with high hardness. Under the action of ultrasonic vibration, the diamond micropowder is easily broken or separated from the core-shell formed by the coumarone resin, thereby forming a porous structure on the core-shell. DETAILED DESCRIPTION

[0023] The present application is described in further detail below. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0024] Materials and Methods

[0025] Unless otherwise specified, the methods used in this example are conventional methods known to those skilled in the art, and the reagents and other materials used are commercially available products unless otherwise specified.

[0026] In order to study the effects of modified titanium dioxide powder and modified kudzu fiber powder on the hardening effect of concrete, the following examples were set up, and comparative examples 1-5 and a blank group were set up, wherein the blank group was a concrete surface not coated with a concrete surface enhancer, which was used as a reference.

[0027] Example 1

[0028] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 15% silicone resin, 35% filler powder, 5% latex powder, 4% sodium sulfate, 1.3% emulsified silicone oil, and 39.7% water. The filler powder is a mixture of modified titanium dioxide powder with a core-shell structure and modified kudzu fiber powder in a mass ratio of 1:0.8.

[0029] In this embodiment, the organic silicone resin is a mixture of organic silane, silicate and siloxane in a mass ratio of 1:1:1.

[0030] A method for preparing a concrete surface enhancer, comprising the following steps:

[0031] Step 1: Prepare modified titanium dioxide powder, spray coumarone resin solution on the outer surface of the titanium dioxide powder, constantly stir during spraying, vitrify the coumarone resin at a temperature of 50°C-60°C, and spray diamond micropowder onto the vitrified coumarone resin under high pressure. After curing, remove the diamond micropowder through ultrasonic vibration to obtain a porous structure on the core-shell formed by the coumarone resin. The prepared modified titanium dioxide powder is collected for later use;

[0032] Step 2: preparing modified kudzu fiber powder, soaking the kudzu fiber in hot water at 80°C-90°C for 2 hours, and repeatedly kneading the fiber during the soaking process at a kneading frequency of 40 times / min, then wringing out the water and ultrasonically treating the fiber at 60°C-70°C for 20 minutes at a stirring speed of 1400 r / min, and then drying and crushing the fiber for later use;

[0033] Step 3: Ultrasonic mixing the modified titanium dioxide powder prepared in step 1 and the modified kudzu fiber powder prepared in step 2 according to the mass ratio to obtain filling powder;

[0034] Step 4: Mix the silicone resin, the filling powder prepared in step 3, latex powder, sodium sulfate, admixture, and water in a certain mass ratio, and let it stand at 25°C ± 2°C for 24 hours to obtain a concrete surface enhancer.

[0035] Example 2

[0036] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 20% silicone resin, 25% filler powder, 3% latex powder, 5% sodium sulfate, 1% emulsified silicone oil, and 46% water. The filler powder is a mixture of modified titanium dioxide powder with a core-shell structure and modified kudzu fiber powder in a mass ratio of 1:0.8.

[0037] In this embodiment, the organic silicone resin is a mixture of organic silane, silicate and siloxane in a mass ratio of 1:1:1.

[0038] The specific preparation methods are consistent with those in Example 1.

[0039] Example 3

[0040] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 24% silicone resin, 12% filler powder, 2% latex powder, 7% sodium sulfate, 1.6% emulsified silicone oil, and 53.4% ​​water. The filler powder is a mixture of modified titanium dioxide powder with a core-shell structure and modified kudzu fiber powder in a mass ratio of 1:0.8.

[0041] In this embodiment, the organic silicone resin is a mixture of organic silane, silicate and siloxane in a mass ratio of 1:1:1.

[0042] The specific preparation methods are consistent with those in Example 1.

[0043] Example 4

[0044] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 20% silicone resin, 25% filler powder, 3% latex powder, 5% sodium sulfate, 1% emulsified silicone oil, and 46% water. The filler powder is a mixture of modified titanium dioxide powder with a core-shell structure and modified kudzu fiber powder in a mass ratio of 1:1.

[0045] In this embodiment, the organic silicone resin is a mixture of organic silane, silicate and siloxane in a mass ratio of 1:1:1.

[0046] The specific preparation methods are consistent with those in Example 2.

[0047] Example 5

[0048] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 20% silicone resin, 25% filler powder, 3% latex powder, 5% sodium sulfate, 1% emulsified silicone oil, and 46% water. The filler powder is a mixture of modified titanium dioxide powder with a core-shell structure and modified kudzu fiber powder in a mass ratio of 1:1.2.

[0049] In this embodiment, the organic silicone resin is a mixture of organic silane, silicate and siloxane in a mass ratio of 1:1:1.

[0050] The specific preparation methods are consistent with those in Example 2.

[0051] Example 6

[0052] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 20% silicone resin, 25% filler powder, 3% latex powder, 5% sodium sulfate, 1% emulsified silicone oil, and 46% water. The filler powder is a mixture of modified titanium dioxide powder with a core-shell structure and modified kudzu fiber powder in a mass ratio of 1:1.5.

[0053] In this embodiment, the organic silicone resin is a mixture of organic silane, silicate and siloxane in a mass ratio of 1:1:1.

[0054] The specific preparation methods are consistent with those in Example 2.

[0055] Comparative Example 1

[0056] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 45% organic silicone resin, 3% latex powder, 5% sodium sulfate, 1% emulsified silicone oil, and 46% water.

[0057] In this comparative example, the organosilicon resin is prepared by mixing organosilane, silicate and siloxane in a mass ratio of 1:1:1.

[0058] The preparation method of the concrete surface enhancer comprises the following specific steps:

[0059] Mix silicone resin, latex powder, sodium sulfate, admixture and water in a certain mass ratio, and let it stand at 25℃±2℃ for 24 hours to obtain the concrete surface enhancer.

[0060] Comparative Example 2

[0061] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 20% silicone resin, 25% filler powder, 3% latex powder, 5% sodium sulfate, 1% emulsified silicone oil, and 46% water. The filler powder is modified titanium dioxide powder with a core-shell structure.

[0062] In this comparative example, the organosilicon resin is prepared by mixing organosilane, silicate and siloxane in a mass ratio of 1:1:1.

[0063] The preparation method of the concrete surface enhancer comprises the following specific steps:

[0064] Step 1: Prepare modified titanium dioxide powder, spray coumarone resin solution on the outer surface of the titanium dioxide powder, constantly stir during spraying, vitrify the coumarone resin at a temperature of 50°C-60°C, and spray diamond micropowder onto the vitrified coumarone resin under high pressure. After curing, remove the diamond micropowder through ultrasonic vibration to obtain a porous structure on the core-shell formed by the coumarone resin. The prepared modified titanium dioxide powder is collected for later use;

[0065] Step 2: Mix the silicone resin, the modified titanium dioxide powder prepared in step 1, latex powder, sodium sulfate, admixture, and water in a mass ratio, and let it stand at 25°C ± 2°C for 24 hours to obtain a concrete surface enhancer.

[0066] Comparative Example 3

[0067] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 20% silicone resin, 25% filler powder, 3% latex powder, 5% sodium sulfate, 1% emulsified silicone oil, and 46% water, wherein the filler powder is modified kudzu fiber powder.

[0068] In this comparative example, the organosilicon resin is prepared by mixing organosilane, silicate and siloxane in a mass ratio of 1:1:1.

[0069] The preparation method of the concrete surface enhancer comprises the following specific steps:

[0070] Step 1: preparing modified kudzu fiber powder, soaking the kudzu fiber in hot water at 80°C-90°C for 2 hours, and repeatedly kneading the fiber during the soaking process at a kneading frequency of 40 times / min, then wringing out the water and ultrasonically treating the fiber at 60°C-70°C for 20 minutes at a stirring speed of 1400 r / min, and then drying and crushing the fiber for use;

[0071] Step 2: Mix the silicone resin, the modified kudzu fiber powder prepared in step 1, latex powder, sodium sulfate, admixture, and water in a mass ratio, and let it stand at 25°C ± 2°C for 24 hours to obtain a concrete surface enhancer.

[0072] Comparative Example 4

[0073] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by mass: 20% silicone resin, 25% filler powder, 3% latex powder, 5% sodium sulfate, 1% emulsified silicone oil, and 46% water. The filler powder is a mixture of modified titanium dioxide powder with a core-shell structure and kudzu fiber powder in a mass ratio of 1:1.2.

[0074] In this comparative example, the organosilicon resin is prepared by mixing organosilane, silicate and siloxane in a mass ratio of 1:1:1.

[0075] The preparation method of the concrete surface enhancer comprises the following specific steps:

[0076] Step 1: Prepare modified titanium dioxide powder, spray coumarone resin solution on the outer surface of the titanium dioxide powder, constantly stir during spraying, vitrify the coumarone resin at a temperature of 50°C-60°C, and spray diamond micropowder onto the vitrified coumarone resin under high pressure. After curing, remove the diamond micropowder through ultrasonic vibration to obtain a porous structure on the core-shell formed by the coumarone resin. The prepared modified titanium dioxide powder is collected for later use;

[0077] Step 2: Prepare kudzu fiber powder by drying and crushing the kudzu fiber for later use.

[0078] Step 3: Mix the silicone resin, the modified titanium dioxide powder prepared in step 1, the kudzu fiber powder prepared in step 2, latex powder, sodium sulfate, admixture, and water in a certain mass ratio, and let it stand at 25°C ± 2°C for 24 hours to obtain a concrete surface enhancer.

[0079] Comparative Example 5

[0080] This embodiment provides a component formula of a concrete surface enhancer, including the following raw materials in percentage by weight: 20% silicone resin, 25% filler powder, 3% latex powder, 5% sodium sulfate, 1% emulsified silicone oil, and 46% water. The filler powder is a mixture of titanium dioxide powder and modified kudzu fiber powder in a mass ratio of 1:1.2.

[0081] In this comparative example, the organosilicon resin is prepared by mixing organosilane, silicate and siloxane in a mass ratio of 1:1:1.

[0082] The preparation method of the concrete surface enhancer comprises the following specific steps:

[0083] Step 1: Prepare titanium dioxide powder and weigh titanium dioxide powder for later use;

[0084] Step 2: preparing modified kudzu fiber powder, soaking the kudzu fiber in hot water at 80°C-90°C for 2 hours, repeatedly kneading it during the soaking process, then wringing out the water and ultrasonically treating it at 60°C-70°C for 20 minutes, and then drying and crushing it for later use;

[0085] Step 3: Mix the silicone resin, the titanium dioxide powder prepared in step 1, the modified kudzu fiber powder prepared in step 2, latex powder, sodium sulfate, admixture, and water in a certain mass ratio, and let it stand at 25°C ± 2°C for 24 hours to obtain a concrete surface enhancer.

[0086] Verification experiment

[0087] The concrete performance test was carried out using the concrete surface enhancers prepared in Examples 1-6 and Comparative Examples 1-5. The dosage of the concrete surface enhancer was 0.4 kg / m 2 , specifically:

[0088] Compressive strength test: GHT450 rebound hammer was used to test the initial compressive strength of concrete, the compressive strength 5 days after applying the concrete surface enhancer, and the compressive strength 60 days after applying the concrete surface enhancer.

[0089] Carbonation test: The experiment is based on GB / T 50082-2009 "Standard for test methods for long-term performance and durability of ordinary concrete". The concrete surface enhancer is applied to the surface of the concrete test block three times, with an interval of 20 minutes between each application. The concrete test blocks coated with the concrete surface enhancer are then placed in a carbonation box. After 28 days, the test blocks are taken out for testing and the carbonation depth of the test blocks is recorded.

[0090] Anti-penetration performance test: The experiment is based on GB / T 50082-2009 "Standard for test methods of long-term performance and durability of ordinary concrete".

[0091] Freeze-thaw resistance test: The experiment is based on GB / T 50082-2009 "Standard for test methods of long-term performance and durability of ordinary concrete".

[0092] Table 1 Performance test data table

[0093] ;

[0094] Experimental conclusion: According to the data of Examples 1-6, the blank group, and Comparative Example 1 in the above table, it can be seen that the concrete surface treated with the concrete surface enhancer of the present invention has better compressive strength than the untreated concrete surface, and also has good anti-penetration effect, anti-carbonization effect, and good anti-freeze effect. The data of Example 5 is significantly better than that of Examples 1-4 and Example 6, indicating that the component formula of Example 5 is the optimal embodiment and can significantly improve the compressive strength of concrete.

[0095] According to the data of Example 5 and Comparative Example 1 in the above table, the concrete surface enhancer prepared by using filler powder instead of silicone resin in the present invention has a significant improvement in the compressive strength of the concrete tested after 5 days and 60 days.

[0096] According to the data of Example 5 and Comparative Examples 2-4 in the above table, it can be seen that the present invention can significantly improve the compressive strength, anti-permeability, anti-carbonization and anti-freeze effects of the concrete surface treated with the concrete surface enhancer through the effect of the modified titanium dioxide powder and the modified kudzu fiber powder. Therefore, it can be seen that the modified titanium dioxide powder and the modified kudzu fiber powder have a synergistic effect with each other. After modification, the titanium dioxide powder has a porous structure and an increased specific surface area, while the kudzu fiber powder has a higher fluffiness after modification. The modified kudzu fiber powder is adsorbed in the pores of the modified titanium dioxide powder. After being mixed with other component materials and sprayed onto the concrete surface, it can penetrate into the gaps between the particles of the concrete and quickly bond to the concrete wall surface with good stability, thereby improving the compressive strength, anti-permeability, anti-carbonization and anti-freeze properties of the concrete.

[0097] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A concrete surface enhancer, characterized in that: The concrete surface enhancer comprises the following raw materials in percentage by mass: 15%-24% silicone resin, 12%-35% filler powder, 2%-5% latex powder, 4%-8% sodium sulfate, 0.3%-3% admixture, and 30%-56% water. The filler powder is a mixture of modified titanium dioxide powder with a core-shell structure and modified kudzu fiber powder in a mass ratio of 1:(0.8-1.5). The organosilicon resin is a mixture of organosilane, silicate and siloxane in a mass ratio of 1:1:1; The preparation method of the concrete surface enhancer comprises the following specific steps: Step 1: Prepare modified titanium dioxide powder, spray coumarone resin solution on the outer surface of the titanium dioxide powder, constantly stir during spraying, vitrify the coumarone resin at a temperature of 50°C-60°C, and spray diamond micropowder onto the vitrified coumarone resin under high pressure. After curing, remove the diamond micropowder through ultrasonic vibration to obtain a porous structure on the core-shell formed by the coumarone resin. The prepared modified titanium dioxide powder is collected for later use; Step 2: preparing modified kudzu fiber powder, soaking the kudzu fiber in hot water at 80°C-90°C for 2 hours, and repeatedly kneading the fiber during the soaking process at a kneading frequency of 40 times / min, then wringing out the water and ultrasonically treating the fiber at 60°C-70°C for 20 minutes at a stirring speed of 1400 r / min, and then drying and crushing the fiber for later use; Step 3: Ultrasonic mixing the modified titanium dioxide powder prepared in step 1 and the modified kudzu fiber powder prepared in step 2 according to the mass ratio to obtain filling powder; Step 4: Mix the silicone resin, the filling powder prepared in step 3, latex powder, sodium sulfate, admixture, and water in a certain mass ratio, and let it stand at 25°C ± 2°C for 24 hours to obtain a concrete surface enhancer.

2. A concrete surface enhancer according to claim 1, characterized in that: The additive is any one or more of polyoxypropylene polyoxyethylene glycerol ether and emulsified silicone oil.

3. Use of the concrete surface enhancer according to any one of claims 1-2 in concrete, characterized in that: The concrete surface enhancer is coated on the concrete surface, and the concrete surface is put into use after being cured for 5-8 days.

4. The use of the concrete surface enhancer according to claim 3, characterized in that: The dosage of the concrete surface enhancer is 0.3-0.6 kg / m 2 .