A preparation process of corrosion-resistant composite concrete

Abstract

The present application discloses a preparation process for corrosion-resistant composite concrete, comprising: S1: preparing concrete materials; S2: mixing materials; S3: adding water and stirring; S4: constructing a casting template; S5: casting concrete; S6: waiting for initial setting and applying silicone; S7: attaching a moisturizing film to the surface of the initial setting concrete; S8: removing the casting template, drain pipe, connecting pipe and lower hose. The present application has at least the following beneficial effects: when the concrete is initially set, an organosilicon solvent is applied to the surface of the concrete, forming hydrophobic Si-O-Si bonds on the surface and pores of the initial setting concrete, delaying ion exchange inside and outside the concrete sample, allowing the cement hydration inside the concrete to proceed normally, forming cementitious C-S-H gel and calcium hydroxide, thereby improving the biocorrosion resistance; and coating during initial setting enables the organosilicon solvent to penetrate deeper rather than stay on the surface, thereby increasing the coverage thickness of the organosilicon solvent.

Description

Technical Field

[0001] The present application relates to the field of concrete technology, and in particular to a preparation process of corrosion-resistant composite concrete. Background Art

[0002] Since the mid-1980s, countries around the world have begun researching high-performance concrete to improve the corrosion resistance and durability of concrete structures in specialized environments. Conventional concrete is susceptible to durability degradation in highly corrosive environments, such as those found in coastal areas with high concentrations of chloride, sulfate, and magnesium salts. Harmful ions in these environments can penetrate the concrete, causing steel corrosion and damage to the concrete structure. Existing technologies tailor materials to the geographical conditions of the construction site to produce concrete tailored to these environments.

[0003] The prior art discloses a corrosion-resistant and pressure-resistant concrete and its preparation process, which relates to the technical field of concrete; the concrete comprises 250-270 parts of cement, 105-115 parts of fly ash, 840-860 parts of river sand, 415-425 parts of crushed stone, 630-640 parts of stone, 3.55-3.85 parts of high-efficiency water reducer, 100-105 parts of water, and 5.5-6.5 parts of corrosion-resistant admixture; the corrosion-resistant admixture comprises a multi-component corrosion-resistant agent, carboxylic acid-modified composite starch, and amino-modified mesoporous silica; the multi-component corrosion-resistant agent comprises tannic acid, sodium gluconate, and poly-L-aspartic acid. The present application adds the corrosion-resistant admixture to reinforced concrete, which can effectively improve the corrosion resistance of reinforced concrete and extend the service life of reinforced concrete when applied to seawater or lake water.

[0004] The existing technology improves the overall corrosion resistance of concrete, but it is well known that the outer surface of concrete is in contact with the outside world for a long time, so the corrosion on the concrete surface is the most serious and is extremely susceptible to external biological corrosion and other corrosion. It is best to coat the concrete surface with corrosion-resistant materials during concrete preparation to prevent high-intensity corrosion on the outer surface. Summary of the Invention

[0005] To this end, the present application provides a preparation process for corrosion-resistant composite concrete to solve the problem in the prior art that the concrete surface is extremely susceptible to corrosion.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A preparation process of corrosion-resistant composite concrete, comprising:

[0008] S1: Prepare concrete materials, including dry materials and wet materials. Dry materials include sulfate-resistant cement, cast stone powder, quartz stone, and fly ash; wet materials include water, water-reducing agent, and anti-corrosion rheological agent.

[0009] S2: Mix sulfate-resistant cement, cast stone powder, quartz stone, fly ash and silica fume into dry materials, mix all materials thoroughly and then pour them into the concrete mixer;

[0010] S3: Slowly add the prepared water to the dry material and start the mixer to stir. At the same time, gradually add the water reducer and anti-corrosion rheological agent and continue stirring until the concrete is uniform and free of lumps.

[0011] S4: Constructing a casting template: placing several lower hoses into the foundation pit or the bottom of the template, and connecting pipes connected to the lower hoses are arranged on both sides of the foundation pit, wherein the lower hoses and the connecting pipes are provided with several drainage holes at equal intervals on the side facing the casting mold cavity, and the upper ends of the connecting pipes are exposed ends;

[0012] S5: pouring concrete: pouring concrete into the pouring mold cavity formed by the set pouring template;

[0013] S6: After the concrete solidifies for 1 hour and reaches the initial setting state, the drainage pipe is connected to the exposed end of the connecting pipe, and an organic silicon solvent is poured into the drainage pipe. The organic silicon solvent is applied to the surface of the initial setting concrete using the drainage holes provided on the lower hose and the connecting pipe.

[0014] S7: Apply a moisturizing film to the surface of the initial setting concrete;

[0015] S8: Remove the casting formwork, drainage pipe, connecting pipe and lower hose.

[0016] Optionally, the specific ratio of the dry materials is: 250-260 parts of sulfate-resistant cement, 500-600 parts of cast stone powder, 1000-1200 parts of quartz stone, 1000-1200 parts of fly ash, and 300-350 parts of silica fume.

[0017] Optionally, based on the specific ratio of the dry materials, the specific ratio of the wet materials is: 150-160 parts of water, 10-15 parts of water reducer, and 0.2-0.4 parts of anti-corrosion rheological agent.

[0018] Optionally, the exposed end of the connecting pipe is higher than the concrete surface.

[0019] Optionally, a permeable membrane is further provided between the connecting pipe, the lower hose and the primary setting concrete, and the permeable membrane is attached to the outer surface of the primary setting concrete.

[0020] Optionally, a plurality of porous structures are evenly arranged on the inner side of the permeable membrane.

[0021] Optionally, a nozzle is installed on the side of the drainage pipe facing the primary setting concrete.

[0022] Optionally, the middle portion of the lower hose is disconnected, and the lower hose is symmetrically arranged with respect to the center of the initial setting concrete.

[0023] Compared with the prior art, this application has at least the following beneficial effects:

[0024] 1. When the concrete is initially set, an organic silicon solvent is applied to the concrete surface, forming a hydrophobic Si-O-Si bond on the surface and pores of the initial setting concrete, delaying the ion exchange inside and outside the concrete sample, allowing the cement hydration inside the concrete to proceed normally, forming cementitious CSH gel and calcium hydroxide, thereby improving the bio-corrosion resistance;

[0025] Furthermore, coating at the time of initial setting enables the silicone solvent to penetrate deeper rather than remain on the surface, thereby increasing the coverage thickness of the silicone solvent.

[0026] 2. Use the drainage holes on the lower hose and the connecting pipe to apply the organic silicon solvent to the surface of the initial setting concrete so that the organic silicon solvent can contact the concrete surface as much as possible.

[0027] 3. Add silica fume during concrete preparation. The addition of silica fume can significantly extend the service life of concrete, especially in harsh environments such as chloride pollution erosion, sulfate erosion, and high humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more intuitively illustrate the prior art and the present application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be considered as limiting conditions for implementing the present application; for example, based on the technical concepts disclosed in the present application and the exemplary drawings, those skilled in the art are capable of easily making routine adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components).

[0029] Figure 1 A flowchart of a process for preparing corrosion-resistant composite concrete provided in one embodiment of the present application;

[0030] Figure 2 This is a diagram of a casting template for a preparation process of corrosion-resistant composite concrete in one embodiment of the present application;

[0031] Description of reference numerals:

[0032] 1. Initially set concrete; 2. Drain pipe; 3. Nozzle; 4. Connecting pipe; 5. Drain hole; 6. Lower hose; 7. Permeable membrane. DETAILED DESCRIPTION

[0033] The present application will be further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0034] The present invention provides a process for preparing corrosion-resistant composite concrete, comprising:

[0035] S1: Prepare concrete materials, which include dry materials and wet materials;

[0036] The dry ingredients include:

[0037] 250-260 parts sulfate-resistant cement; sulfate-resistant cement has excellent resistance to sulfate attack. This is primarily due to its unique chemical composition and manufacturing process, which limits the content of tricalcium aluminate and tricalcium silicate in the cement, thereby improving its corrosion resistance to sulfate ions. Medium-sulfur-resistant cement can generally withstand corrosive media with a SO42- concentration of 2500 mg / L, while high-sulfur-resistant cement can withstand even higher concentrations of sulfate, generally resistant to SO42- concentrations of 10,000-20,000 mg / L.

[0038] 500-600 parts of cast stone powder; cast stone powder has excellent acid and alkali resistance. Its main components include silicon dioxide and aluminum oxide, and contain small amounts of other oxides such as iron oxide, calcium oxide, and titanium dioxide. These ingredients make cast stone powder excellent in corrosion resistance, with corrosion resistance more than 10 times that of acid-resistant cement;

[0039] 1000-1200 parts of quartz stone; Quartz stone itself has the characteristics of high hardness, strong corrosion resistance, and good stability. When quartz stone is added to cement, these properties can be transferred to the cement product, thereby improving its durability and service life. Especially in some harsh environments, such as high temperature, high pressure, acid and alkali, the addition of quartz stone can significantly enhance the corrosion resistance of cement products.

[0040] 1000-1200 parts of fly ash; the addition of fly ash can effectively improve the density of concrete and has a positive effect on resisting sulfate corrosion;

[0041] 300-350 parts silica fume; The addition of silica fume can significantly extend the service life of concrete, especially in harsh environments such as chloride pollution, sulfate corrosion, and high humidity, and can double or even multiply the durability of concrete. This is because silica fume can form a gel with hydration products and react with the alkaline material magnesium oxide to form a gel. This gel can fill the micro-cracks and pores within the concrete, thereby improving the concrete's density and impermeability.

[0042] Wet materials include:

[0043] 150-160 parts water;

[0044] 10-15 parts of water reducing agent;

[0045] 0.2-0.4 parts of anti-corrosion rheological agent; the anti-corrosion component in the anti-corrosion rheological agent can form a protective film inside the concrete, preventing or delaying the erosion of harmful substances such as sulfates and chlorides, thereby improving the corrosion resistance of the concrete;

[0046] S2: Mix sulfate-resistant cement, cast stone powder, quartz stone, fly ash and silica fume into dry materials, and ensure that all materials are fully mixed before pouring into the concrete mixer;

[0047] S3: Slowly add the prepared water to the dry material and start the mixer to stir. At the same time, gradually add the water reducer and anti-corrosion rheological agent and continue stirring until the concrete is uniform and free of lumps.

[0048] S4: Constructing a pouring formwork: several lower hoses 6 are placed into the foundation pit or the bottom of the formwork. Connecting pipes 4 connected to the lower hoses 6 are arranged on both sides of the foundation pit. The lower hoses 6 and the connecting pipes 4 are provided with several drainage holes 5 at equal intervals on the side facing the pouring mold cavity. The upper end of the connecting pipe 4 is an exposed end, which is higher than the concrete surface. The middle part of the lower hoses 6 is disconnected, and the lower hoses 6 are symmetrically arranged about the center of the initial setting concrete 1, thereby shortening the length of a single lower hose 6 and facilitating the removal of the lower hoses 6.

[0049] S5: pouring concrete: pouring concrete into the pouring mold cavity formed by the set pouring template;

[0050] S6: After the concrete solidifies for 1 hour and reaches the initial setting state, the drainage pipe 2 is connected to the exposed end of the connecting pipe 4, and an organic silicon solvent is poured into the drainage pipe 2. The organic silicon solvent is applied to the surface of the initial setting concrete 1 using the drainage holes 5 provided on the surface of the lower hose 6 and the connecting pipe 4. Hydrophobic Si-O-Si bonds are formed on the surface and pores of the initial setting concrete 1, delaying ion exchange inside and outside the concrete sample, allowing the cement hydration inside the concrete to proceed normally, forming cementitious CSH gel and calcium hydroxide, thereby improving the biocorrosion resistance. Moreover, coating during the initial setting allows the organic silicon solvent to penetrate deeper rather than remain on the surface, thereby increasing the coverage thickness of the organic silicon solvent.

[0051] S7: Laminating a moisturizing film on the surface of the primary setting concrete 1;

[0052] S8: Remove the casting template, the drainage pipe 2, the connecting pipe 4 and the lower hose 6. Since the lower hose 6 is a hose, it is convenient to remove the lower hose 6 when the drainage hole 5 is removed later.

[0053] Furthermore, a permeable membrane 7 is provided between the connecting pipe 4 and the lower hose 6 and the initial setting concrete 1. The permeable membrane 7 is attached to the outer surface of the initial setting concrete 1, forming a thin film structure between the initial setting concrete 1 and the connecting pipe 4 and the lower hose 6, thereby facilitating the removal of the connecting pipe 4 and the lower hose 6.

[0054] The inner side of the permeable membrane 7 is evenly provided with a plurality of porous structures, which facilitates the coating of the organic silicon solvent discharged from the connecting pipe 4 and the lower hose 6 on the surface of the primary setting concrete 1, while preventing the drainage hole 5 from being blocked when the primary setting concrete 1 is poured;

[0055] A nozzle 3 is installed on the side of the drain pipe 2 facing the primary setting concrete 1, so that the organic silicon solvent can also be discharged from the drain pipe 2 to be coated on the upper surface of the primary setting concrete 1, thereby meeting the requirements of some processes.

[0056] The technical features of the above embodiments can be combined arbitrarily as long as there is no contradiction in the combination of these technical features. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A process for preparing corrosion-resistant composite concrete, characterized in that: include: S1: Prepare concrete materials, including dry materials and wet materials. Dry materials include: sulfate-resistant cement, cast stone powder, quartz stone, fly ash, and silica fume; wet materials include: water, water reducer, and anti-corrosion rheological agent. S2: Mix sulfate-resistant cement, cast stone powder, quartz stone, fly ash and silica fume into dry materials, mix all materials thoroughly and then pour them into the concrete mixer; S3: Slowly add the prepared water to the dry material and start the mixer to stir. At the same time, gradually add the water reducer and anti-corrosion rheological agent and continue stirring until the concrete is uniform and free of lumps. S4: Constructing a casting template: placing a plurality of lower hoses (6) into a foundation pit or the bottom of a template, and connecting pipes (4) connected to the lower hoses (6) are arranged on both sides of the foundation pit, and a permeable membrane (7) is provided on the connecting pipes (4) and the lower hoses (6), wherein the lower hoses (6) and the connecting pipes (4) are provided with a plurality of drainage holes (5) at equal intervals on the side facing the casting mold cavity, and the upper end of the connecting pipe (4) is an exposed end; S5: pouring concrete: pouring concrete into the pouring mold cavity formed by the set pouring template; S6: After the concrete solidifies for 1 hour and reaches the initial setting state, the drainage pipe (2) is connected to the exposed end of the connecting pipe (4), and an organic silicon solvent is poured into the drainage pipe (2). The organic silicon solvent is applied to the surface of the initial setting concrete (1) using a plurality of drainage holes (5) provided on the surface of the lower hose (6) and the connecting pipe (4); S7: Laminating a moisturizing film on the surface of the primary setting concrete (1); S8: Remove the casting template, the drainage pipe (2), the connecting pipe (4) and the lower hose (6).

2. The process for preparing a corrosion-resistant composite concrete according to claim 1, characterized in that: The specific proportion of the dry materials is: 250-260 parts of sulfate-resistant cement, 500-600 parts of cast stone powder, 1000-1200 parts of quartz stone, 1000-1200 parts of fly ash, and 300-350 parts of silica fume.

3. The process for preparing a corrosion-resistant composite concrete according to claim 2, characterized in that: Based on the specific ratio of the dry materials, the specific ratio of the wet materials is: 150-160 parts of water, 10-15 parts of water reducer, and 0.2-0.4 parts of anti-corrosion rheological agent.

4. The process for preparing a corrosion-resistant composite concrete according to claim 1, characterized in that: The exposed end of the connecting pipe (4) is higher than the concrete surface.

5. The process for preparing a corrosion-resistant composite concrete according to claim 1, characterized in that: The permeable membrane (7) is attached to the outer surface of the primary setting concrete (1).

6. The process for preparing a corrosion-resistant composite concrete according to claim 5, characterized in that: A plurality of pore structures are evenly arranged on the inner side of the permeable membrane (7).

7. The process for preparing a corrosion-resistant composite concrete according to claim 1, characterized in that: A nozzle (3) is installed on the side of the drainage pipe (2) facing the primary setting concrete (1).

8. The process for preparing corrosion-resistant composite concrete according to claim 1, characterized in that: The middle portion of the lower hose (6) is disconnected, and the lower hose (6) is symmetrically arranged with respect to the center of the primary setting concrete (1).

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