Cement-based piping inverted filter brick and preparation method thereof

Abstract

The invention relates to the technical field of piping inverted filter bricks, in particular to a cement-based piping inverted filter brick and a preparation method thereof. Which comprises Portland cement, mineral powder, fly ash, silica fume, recycled aggregate and an additive. The method comprises the following steps: mixing the recycled aggregate, the Portland cement, the mineral powder and the silica fume; sequentially adding latex powder, a water reducing agent, sodium citrate, tartaric acid, lithium sulfate or lithium carbonate, cellulose ether, a defoaming agent and a dispersing wetting agent, and uniformly stirring; after being uniformly stirred to prepare mortar, the mortar and tap water are uniformly stirred and mixed at a high speed, and the addition amount of the water is 8-10% of the total mass of the mortar; the cement-based piping anti-filtration mortar is poured into a mold to prepare the high-strength piping anti-filtration brick, and the high-strength piping anti-filtration brick is used after being cured to a specified age after being demolded, so that the effects of increasing the manufacturing speed of the piping anti-filtration well, reusing the materials and not preparing the materials of the piping anti-filtration well are realized, and the manpower and the time are saved.

Description

Technical Field

[0001] This invention relates to the field of piping filter brick technology, and in particular to a cement-based piping filter brick and its preparation method. Background Technology

[0002] Cement-based piping filtration mortar is a polymer cement mortar with special functions such as freeze-thaw resistance, ultra-long weather resistance, and high compressive strength. It is made of silicate cement, mineral powder, and silica fume as cementing materials, with the addition of specific aggregates, and modified with rigid EVA latex powder and various functional additives. It is mixed into a uniform powder product through a special production process. When used, water is added and stirred at low speed to form a viscous slurry, which is then poured into a specific mold and leveled and compacted.

[0003] my country has numerous rivers and lakes, and piping occurs in dikes every time a flood occurs. If not dealt with in time, it will cause the dike to break. The current routine operation is to temporarily make piping reverse filter wells by filling woven bags with soil and mixing them with materials such as gravel, straw and branches.

[0004] However, in the above operations, the materials for making piping reverse filter wells are complicated to find and require a lot of manpower and time, resulting in a slow production speed and long processing time. Summary of the Invention

[0005] The purpose of this invention is to provide a cement-based piping reverse filter brick and its preparation method, which aims to solve the technical problems in the prior art where the material search for making piping reverse filter wells is complicated, requires a lot of manpower and time, resulting in slow production speed and long processing time.

[0006] To achieve the above objectives, the present invention employs a cement-based piping filter brick, comprising silicate cement, mineral powder, fly ash, silica fume, recycled aggregate, and admixtures, wherein the mass percentages of each component are: 15-22% silicate cement, 1-2% silica fume, 3-5% mineral powder, 2-3% fly ash, 70-80% recycled aggregate, 1-2% basalt fiber, and 2.0-3.5% admixtures.

[0007] The strength grade of the silicate cement is PⅡ52.5 silicate cement.

[0008] The mineral powder is of type S105.

[0009] The fly ash mentioned above is grade I fly ash.

[0010] The silica fume has a fineness of less than 1 μm.

[0011] The recycled aggregate is a high-strength aggregate sintered from solid waste, with a particle size of 5-6 mm and 8-10 mm.

[0012] The basalt fiber is a continuous fiber made from natural basalt rock as raw material, melted at 1450~1500℃ and drawn at high speed through a platinum alloy drawing spindle. It has a diameter of 13~17µm and a length of 20~30mm.

[0013] The admixtures include a high-efficiency water-reducing agent, redispersible latex powder, a water-retaining agent, a defoamer, a retarder, an early-strength agent, and a dispersing and wetting agent, with the following dosages: high-efficiency water-reducing agent accounting for 0.13%~0.26% of the total, redispersible latex powder accounting for 1.5%~2.5% of the total, water-retaining agent accounting for 0.04%~0.06% of the total, defoamer accounting for 0.12%~0.2% of the total, retarder accounting for 0.04%~0.15% of the total, early-strength agent accounting for 0.05%~0.1% of the total, and dispersing and wetting agent accounting for 0.12%~0.23% of the total.

[0014] Among them, the high-efficiency water-reducing agent is a polycarboxylate water-reducing agent, the redispersible latex powder is a copolymer of acrylate, vinyl acetate, ethylene tert-carbonate and ethylene, the water-retaining agent is water-soluble hydroxyethyl cellulose ether or hydroxypropyl methyl cellulose ether powder, the defoamer is a mixture of polyol and polysiloxane compound and non-crystalline silicon dioxide, the retarder is 2,3-dihydroxysuccinic acid and sodium citrate and a mixture thereof, the early strength agent is either lithium sulfate or lithium carbonate powder, and the dispersing and wetting agent is sulfonated naphthalene powder.

[0015] This invention also provides a method for preparing cement-based piping-resistant filter bricks, comprising the following steps: Mix recycled aggregate, silicate cement, mineral powder, and silica fume; Add latex powder, water-reducing agent, sodium citrate, tartaric acid, lithium sulfate or lithium carbonate, cellulose ether, defoamer, and dispersing and wetting agent in sequence, and stir well; After the mortar is evenly mixed, it is mixed with tap water at high speed to obtain cement-based piping reverse filter mortar, in which the amount of water added is 8~10% of the total mass of the mortar; High-strength piping filter bricks are prepared by pouring cement-based piping filter mortar into molds, and then curing them to the specified age before use.

[0016] This invention discloses a cement-based piping filter brick and its preparation method, comprising silicate cement, mineral powder, fly ash, silica fume, recycled aggregate, and admixtures, wherein the mass percentages of each component are: 15-22% silicate cement, 1-2% silica fume, 3-5% mineral powder, 2-3% fly ash, 70-80% recycled aggregate, 1-2% basalt fiber, and 2.0-3.5% admixtures; the method includes the following steps: mixing recycled aggregate, Silicate cement, mineral powder, and silica fume are mixed; latex powder, water-reducing agent, sodium citrate, tartaric acid, lithium sulfate or lithium carbonate, cellulose ether, defoamer, and dispersing and wetting agent are added sequentially and stirred evenly; after the mortar is evenly mixed, it is mixed with tap water at high speed to obtain cement-based piping filter mortar, in which the amount of water added is 8-10% of the total mass of mortar; the cement-based piping filter mortar is poured into molds to prepare high-strength piping filter bricks, which are then demolded and cured to the specified age before use. Through the above method, the speed of piping filter well production is improved, and the reuse of materials eliminates the need to prepare materials for piping filter wells, saving manpower and time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the steps involved in preparing the cement-based piping filter brick and its preparation method according to the present invention. Detailed Implementation

[0019] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0020] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0021] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0022] This invention provides a cement-based piping filter brick, comprising silicate cement, mineral powder, fly ash, silica fume, recycled aggregate and admixtures, wherein the mass percentages of each component are: 15-22% silicate cement, 1-2% silica fume, 3-5% mineral powder, 2-3% fly ash, 70-80% recycled aggregate, 1-2% basalt fiber and 2.0-3.5% admixtures.

[0023] The strength grade of the silicate cement is PⅡ52.5 silicate cement, the mineral powder is S105 type, the fly ash is grade 1 fly ash, the fineness of the silica fume is less than 1μm, and the recycled aggregate is solid waste sintered high-strength aggregate with a particle size of 5~6mm and 8~10mm. The basalt fiber is a continuous fiber made from natural basalt rock as raw material, melted at 1450~1500℃ and drawn at high speed through a platinum alloy drawing spindle. It has a diameter of 13~17µm and a length of 20~30mm. The admixtures include high-efficiency water-reducing agent, redispersible latex powder, water-retaining agent, defoamer, retarder, early-strength agent, and dispersant / wetting agent, with the following dosages: high-efficiency water-reducing agent accounts for 0.13%~0.26% of the total, redispersible latex powder accounts for 1.5%~2.5% of the total, water-retaining agent accounts for 0.04%~0.06% of the total, defoamer accounts for 0.12%~0.2% of the total, retarder accounts for 0.04%~0.15% of the total, early-strength agent accounts for 0.05%~0.1% of the total, and dispersant / wetting agent accounts for 0.12%~0.23% of the total.

[0024] The high-efficiency water-reducing agent is a polycarboxylate-based water-reducing agent; the redispersible latex powder is a copolymer of acrylate, vinyl acetate, ethylene tert-carbonate, and ethylene, comprising 1 to 5 substances; the water-retaining agent is water-soluble hydroxyethyl cellulose ether or hydroxypropyl methyl cellulose ether powder; the defoamer is a mixture of polyols, polysiloxane compounds, and non-crystalline silica, comprising 1 to 5 substances; the retarder is 2,3-dihydroxysuccinic acid and sodium citrate, or a mixture thereof; the early-strength agent is either lithium sulfate or lithium carbonate powder; and the dispersing and wetting agent is sulfonated naphthalene powder. The cement-based piping filter mortar prepared using the above-mentioned raw materials is used to prepare cement-based piping filter bricks. These bricks are suitable for water conservancy projects and disaster prevention and relief projects. The mortar is characterized by stable quality and ample supply. Furthermore, since recycled aggregates are solid waste recycling products, it expands new avenues for solid waste utilization. The prepared piping filter bricks can be reused, saving on natural sand and cement usage, which aligns with green circular economy policies. Significant economic and social benefits are expected. This method also increases the speed of piping filter well construction, and by utilizing material reuse, there is no need to prepare materials for piping filter wells again, saving manpower and time.

[0025] Further, see Table 1 of the following examples (High-strength reverse filter floor mortar). ; In this embodiment, after preparing the cement-based reverse filter floor mortar according to the above-mentioned mass percentage, 10% of the total mass of the mortar is added with mixing water, and the mixture is stirred at low speed for no less than three minutes before construction (water is added before material is added). After curing to the specified age, various properties are measured.

[0026] Further, see Table 2 of the Examples (Piping Reverse Filter Bricks) ; In this embodiment, after preparing the cement-based piping reverse filter mortar according to the above-mentioned mass percentage, 9% of the total mass of the mortar is added with mixing water, and the mixture is stirred at low speed for no less than three minutes before construction (water is added first, then the material is added). The mortar is poured into a special mold, demolded, and cured to the specified age before various properties are measured.

[0027] The properties of the cement-based piping reverse filter mortar in Examples 1 and 2 were tested and analyzed, and the results are shown in Table 3 below.

[0028] The test methods refer to the following standards: JC / T 2558-2020 "Permeable Concrete" and DB32 / T1463-2021 "Technical Specification for Application of Premixed Permeable Cement Concrete".

[0029] ; Please see Figure 1 The present invention also provides a cement-based piping-resistant filter brick and its preparation method, comprising the following steps: S100: A mixture of recycled aggregate, silicate cement, mineral powder, and silica fume; S200: Add latex powder, water-reducing agent, sodium citrate, tartaric acid, lithium sulfate or lithium carbonate, cellulose ether, defoamer and dispersing and wetting agent in sequence, and stir evenly; S300: After the mortar is evenly mixed, it is mixed with tap water at high speed to obtain cement-based piping reverse filter mortar, wherein the amount of water added is 8~10% of the total mass of the mortar; S400: High-strength piping filter bricks are prepared by pouring cement-based piping filter mortar into molds, and then used after demolding and curing to the specified age.

[0030] In this embodiment, recycled aggregate, silicate cement, mineral powder, and silica fume are first mixed; then latex powder, water-reducing agent, sodium citrate, tartaric acid, lithium sulfate or lithium carbonate, cellulose ether, defoamer, and dispersing and wetting agent are added in sequence and stirred evenly; after the mortar is evenly mixed, it is mixed with tap water at high speed to obtain cement-based piping filter mortar, wherein the amount of water added is 8-10% of the total mass of mortar. Finally, the cement-based piping filter mortar is poured into a mold to prepare high-strength piping filter bricks, which are then cured to the specified age before use.

[0031] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0032] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A cement-based piping-resistant filter brick, characterized in that, It includes silicate cement, mineral powder, fly ash, silica fume, recycled aggregate and admixtures, wherein the mass percentage of each component is: 15~22% silicate cement, 1~2% silica fume, 3~5% mineral powder, 2~3% fly ash, 70~80% recycled aggregate, 1~2% basalt fiber and 2.0~3.5% admixtures.

2. The cement-based piping filter brick as described in claim 1, characterized in that, The strength grade of the silicate cement is PⅡ52.5 silicate cement.

3. The cement-based piping filter brick as described in claim 1, characterized in that, The mineral powder is of type S105.

4. The cement-based piping filter brick as described in claim 1, characterized in that, The fly ash is grade I fly ash.

5. The cement-based piping filter brick as described in claim 1, characterized in that, The silica fume has a fineness of less than 1 μm.

6. The cement-based piping filter brick as described in claim 1, characterized in that, The recycled aggregate is a high-strength aggregate sintered from solid waste, with a particle size of 5-6 mm and 8-10 mm.

7. The cement-based piping filter brick as described in claim 1, characterized in that, The basalt fiber is a continuous fiber made from natural basalt rock as raw material, melted at 1450~1500℃ and drawn at high speed through a platinum alloy drawing spindle. It has a diameter of 13~17µm and a length of 20~30mm.

8. The cement-based piping filter brick as described in claim 1, characterized in that, The admixtures include high-efficiency water-reducing agent, redispersible latex powder, water-retaining agent, defoamer, retarder, early-strength agent, and dispersant / wetting agent, with the following dosages: high-efficiency water-reducing agent accounts for 0.13%~0.26% of the total, redispersible latex powder accounts for 1.5%~2.5% of the total, water-retaining agent accounts for 0.04%~0.06% of the total, defoamer accounts for 0.12%~0.2% of the total, retarder accounts for 0.04%~0.15% of the total, early-strength agent accounts for 0.05%~0.1% of the total, and dispersant / wetting agent accounts for 0.12%~0.23% of the total.

9. The cement-based piping filter brick as described in claim 8, characterized in that, The high-efficiency water-reducing agent is a polycarboxylate-based water-reducing agent; the redispersible latex powder is a copolymer of acrylate, vinyl acetate, ethylene tert-carbonate, and ethylene, comprising 1 to 5 substances; the water-retaining agent is water-soluble hydroxyethyl cellulose ether or hydroxypropyl methyl cellulose ether powder; the defoamer is a mixture of polyols, polysiloxane compounds, and non-crystalline silica, comprising 1 to 5 substances; the retarder is 2,3-dihydroxysuccinic acid and sodium citrate, or a mixture thereof; the early-strength agent is either lithium sulfate or lithium carbonate powder; and the dispersing and wetting agent is sulfonated naphthalene powder.

10. A method for preparing a cement-based piping-resistant filter brick, as described in claim 1, characterized in that, Includes the following steps: Mix recycled aggregate, silicate cement, mineral powder, and silica fume; Add latex powder, water-reducing agent, sodium citrate, tartaric acid, lithium sulfate or lithium carbonate, cellulose ether, defoamer, and dispersing and wetting agent in sequence, and stir well; After the mortar is evenly mixed, it is mixed with tap water at high speed to obtain cement-based piping reverse filter mortar, in which the amount of water added is 8~10% of the total mass of the mortar; High-strength piping filter bricks are prepared by pouring cement-based piping filter mortar into molds, and then curing them to the specified age before use.

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