Preparation process of corrosion-resistant composite concrete

Abstract

The invention discloses a preparation process of corrosion-resistant composite concrete. The preparation process comprises the following steps: S1, preparing a concrete material; s2, mixing the materials; s3, adding water and stirring; s4, a pouring formwork is constructed; s5, concrete is poured; s6, waiting for initial coagulation and coating organic silicon; s7, a moisturizing film is attached to the surface of the initial set concrete; and S8, the pouring formwork, the liquid discharging pipe, the connecting pipe and the lower hose are dismantled. The method at least has the following beneficial effects that the surface of the concrete is coated with the organic silicon solvent during initial setting of the concrete, hydrophobic Si-O-Si bonds are formed on the surface and pore channels of the initial setting concrete, ion exchange inside and outside a concrete sample is delayed, hydration of cement inside the concrete is normally carried out, cementitious C-S-H gel and calcium aluminate calcium hydroxide are formed, and the concrete is subjected to initial setting; therefore, the biological corrosion resistance is improved; and coating is performed during initial setting, so that the organic silicon solvent can permeate to a deeper position instead of staying on the surface, and the covering thickness of the organic silicon solvent is increased.

Description

Technical Field

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

[0002] Since the mid-1980s, countries have begun to study high-performance concrete to improve the corrosion resistance and durability of concrete structures in special environments. Traditional concrete is prone to durability degradation in highly corrosive environments, such as high-concentration chloride, sulfate and magnesium salt environments in coastal areas. Harmful ions in the environment will invade the concrete, causing steel corrosion and damage to the concrete structure. Existing technologies will make corresponding material allocations based on the geographical conditions of the current construction area to produce concrete for the corresponding environment.

[0003] The prior art discloses a corrosion-resistant and pressure-resistant concrete and a preparation process thereof, 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, and the multi-component corrosion-resistant agent comprises tannic acid, sodium gluconate, and poly-L-aspartic acid. The present application adds a corrosion-resistant admixture to reinforced concrete, which can effectively improve the corrosion resistance of reinforced concrete and improve 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 as we all know, 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 of 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, wherein the dry materials include: anti-sulfate cement, cast stone powder, quartz stone, fly ash; the wet materials include: water, water reducing agent, anti-corrosion rheological agent;

[0009] S2: Mix sulfate-resistant cement, cast stone powder, quartz stone, fly ash and silica fume as dry materials, and pour them into the concrete mixer after the various materials are fully mixed;

[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 a plurality of lower hoses into a foundation pit or the bottom of a 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 a plurality of drainage holes at equal intervals on the side facing the casting mold cavity, and the upper end of the connecting pipe is an exposed end;

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

[0013] S6: After the concrete solidifies for 1 hour and reaches the initial setting state of the concrete, the drainage pipe is connected to the exposed end of the connecting pipe, and the 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 opened on the lower hose and the connecting pipe surface;

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

[0015] S8: Remove the casting formwork, drain 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 material, the specific ratio of the wet material is: 150-160 parts of water, 10-15 parts of water reducing agent, and 0.2-0.4 parts of anticorrosive 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 initial setting concrete, and the permeable membrane is attached to the outer surface of the initial 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 during the initial setting period 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 when preparing concrete. The addition of silica fume can significantly extend the service life of concrete, especially in harsh environments such as chloride pollution, sulfate erosion, and high humidity. BRIEF DESCRIPTION OF THE DRAWINGS

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

[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 A diagram of a casting template for a preparation process of a corrosion-resistant composite concrete in one embodiment of the present application;

[0031] Description of reference numerals:

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

[0033] The present application is 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 of sulfate-resistant cement; sulfate-resistant cement has excellent ability to resist sulfate erosion. This is mainly due to its special chemical composition and manufacturing process, which limits the content of tricalcium aluminate and tricalcium silicate in cement, thereby improving corrosion resistance to sulfate ions. Medium-sulfur-resistant cement can generally resist corrosive media with a SO42- concentration of 2500 mg / L, while high-sulfur-resistant cement can resist higher concentrations of sulfate erosion, generally resisting corrosive media with a SO42- concentration of 10,000 to 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 a small amount of other oxides such as iron oxide, calcium oxide and titanium dioxide. These ingredients make cast stone powder excellent in corrosion resistance, and its corrosion resistance is 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. After adding quartz stone to cement, these characteristics can be passed on to cement products, thereby improving their 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 play a positive role in resisting sulfate corrosion;

[0041] 300-350 parts of silica fume; the addition of silica fume can significantly extend the service life of concrete, especially in harsh environments such as chloride pollution erosion, sulfate erosion, high humidity, etc., and can double or even several times the durability of concrete. This is because silica fume can react with hydration products to form gels, and react with alkaline material magnesium oxide to form gels. These gels can fill the micro cracks and pores inside the concrete, thereby improving the density and impermeability of the concrete;

[0042] Wet materials include:

[0043] 150-160 parts of 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 as 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: placing a plurality of lower hoses 6 into a foundation pit or the bottom of a formwork, and connecting pipes 4 connected to the lower hoses 6 are arranged on both sides of the foundation pit, 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 pouring mold cavity, the upper end of the connecting pipe 4 is an exposed end, and the exposed end 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 hose 6;

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

[0050] S6: After waiting for the concrete to solidify for 1 hour and reach the initial setting state of the concrete, the drainage pipe 2 is connected to the exposed end of the connecting pipe 4, and the organic silicon solvent is poured into the drainage pipe 2. The organic silicon solvent is coated on the surface of the initial setting concrete 1 by using the plurality of drainage holes 5 opened on the surface of the lower hose 6 and the connecting pipe 4, and a hydrophobic Si-O-Si bond is formed on the surface and pores of the initial setting concrete 1, delaying the ion exchange inside and outside the concrete sample, so that the cement hydration inside the concrete can proceed normally, forming cementitious CSH gel and calcium hydroxide, thereby improving the biological corrosion resistance. Moreover, coating during the initial setting can make the organic silicon solvent penetrate to a deeper position instead of staying on the surface, thereby increasing the coverage thickness of the organic silicon solvent;

[0051] S7: Laminating a moisture-retaining 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. Because 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, and a thin film structure is formed between the initial setting concrete 1 and the connecting pipe 4 and the lower hose 6, so that the connecting pipe 4 and the lower hose 6 can be easily removed.

[0054] The inner side of the permeable membrane 7 is evenly provided with a plurality of pore structures, so as to facilitate the organic silicon solvent discharged from the connecting tube 4 and the lower hose 6 to be coated on the surface of the primary setting concrete 1, and to prevent 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 be discharged from the drain pipe 2 and 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, wherein the dry materials include: anti-sulfate cement, cast stone powder, quartz stone, fly ash, silica fume; the wet materials include: water, water reducing agent, anti-corrosion rheological agent; S2: Mix sulfate-resistant cement, cast stone powder, quartz stone, fly ash and silica fume as dry materials, and pour them into the concrete mixer after the various materials are fully mixed; 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, 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 casting mold cavity formed by the set casting 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) by using a plurality of drainage holes (5) provided on the surface of the lower hose (6) and the connecting pipe (4); S7: Laminating a moisture-retaining film on the surface of the initial setting concrete (1); S8: Remove the casting template, the drain 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 preparation process of a corrosion-resistant composite concrete according to claim 2, characterized in that: Based on the specific proportion of the dry material, the specific proportion of the wet material is: 150-160 parts of water, 10-15 parts of water reducing agent, and 0.2-0.4 parts of anticorrosive rheological agent.

4. The preparation process of 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: A permeable membrane (7) is also provided between the connecting pipe (4), the lower hose (6) and the initial setting concrete (1), and the permeable membrane (7) is attached to the outer surface of the initial 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 a corrosion-resistant composite concrete according to claim 1, characterized in that: The middle part of the lower hose (6) is disconnected, and the lower hose (6) is symmetrically arranged with respect to the center of the initial setting concrete (1).

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