Preparation method of phosphogypsum-based water-stable material

Abstract

The invention relates to the technical field of building materials, and discloses a preparation method of an ardealite-based water-stable material which comprises the following components in parts by weight: 40-60 parts of ardealite; 15 to 25 parts of cement; 5 to 10 parts of lime; 10 to 20 parts of fly ash; 5 to 10 parts of silica fume; 10 to 20 parts of superfine slag powder; 3 to 7 parts of bentonite; 0.5 to 1.5 parts of plant fiber; the preparation method comprises the following steps: S1, primary mixing of dry materials: putting the ardealite, the cement, the lime, the fly ash, the silica fume, the superfine slag powder and the bentonite into a stirrer in proportion, and carrying out dry stirring for 5-10 minutes; s2, adding plant fibers: after the dry materials are uniformly mixed, adding the treated plant fibers, and continuously stirring for 3-5 minutes. By adding the plant fibers and the bentonite, the crack resistance of the material is remarkably improved, cracks caused by dry shrinkage or temperature change can be effectively prevented, meanwhile, the water penetration resistance is enhanced, and the material is suitable for a humid environment and underground engineering.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a method for preparing a phosphogypsum-based water-stabilizing material. Background Art

[0002] In road engineering and infrastructure construction, water-stabilized materials are widely used in roadbeds and cushion layers. However, traditional water-stabilized materials face many technical challenges. First, insufficient crack resistance makes the material prone to cracks when it shrinks and changes in temperature, reducing the strength and durability of the overall structure. This is mainly due to unreasonable material composition and proportion, which usually relies on a single cementitious material (such as cement and lime) and fails to make full use of other auxiliary materials.

[0003] Secondly, the water stability of traditional water-stabilizing materials is poor, especially in humid or flooded environments, and the ability to resist water penetration is limited, which leads to a decrease in material strength and affects the stability of the roadbed. In addition, the strength and durability of traditional materials cannot meet the needs of high traffic loads and complex environmental conditions, and the lack of effective reinforcement measures makes the materials prone to damage under stress concentration and external loads. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for preparing phosphogypsum-based water-stabilizing materials to solve the problem that traditional water-stabilizing materials are insufficient in crack resistance, water stability and strength and cannot meet the requirements of high traffic loads and complex environmental conditions.

[0005] To achieve the above objectives, the present invention is implemented through the following technical scheme: a phosphogypsum-based water-stabilizing material, comprising the following parts by weight:

[0006] 40-60 parts of phosphogypsum;

[0007] Cement 15-25 parts;

[0008] 5-10 parts of lime;

[0009] 10-20 parts of fly ash;

[0010] Silica fume 5-10 parts;

[0011] 10-20 parts of slag powder;

[0012] 3-7 parts of bentonite;

[0013] 0.5-1.5 parts of plant fiber;

[0014] Waterproofing agent, water repellent, superplasticizer 1-5 parts.

[0015] Preferably, the plant fiber is processed straw fiber or wood fiber.

[0016] Preferably, the waterproofing agent is a silane waterproofing agent, the water repellent is a siloxane water repellent, and the superplasticizer is a polycarboxylic acid superplasticizer.

[0017] Preferably, the material further comprises 5 to 15 parts of polymer emulsion.

[0018] A method for preparing a phosphogypsum-based water-stable material comprises the following steps:

[0019] S1. Initial mixing of dry materials: Phosphogypsum, cement, lime, fly ash, silica fume, slag powder and bentonite are put into a mixer in proportion and dry mixed for 5 minutes to 10 minutes;

[0020] S2. Adding plant fiber: After the dry materials are evenly mixed, add the treated plant fiber and continue stirring for 3 minutes to 5 minutes;

[0021] S3. Adding admixtures: After the dry material and plant fiber are evenly mixed, add admixtures such as waterproofing agent, superplasticizer, and water repellent, and continue stirring for 2 minutes to 3 minutes;

[0022] S4. Add water and wet mix: gradually add water while continuously stirring for 5-10 minutes to form a uniform wet mix.

[0023] Preferably, a high-efficiency stirring device is used for stirring in the dry mixing step, and the stirrer is a double-shaft mixer or a forced mixer to ensure uniform mixing of the dry material and the wet material.

[0024] Preferably, the plant fibers are surface treated before being added and have a length of 5 mm to 10 mm.

[0025] Preferably, the admixture includes a water-repellent, a water-repellent and a superplasticizer.

[0026] Preferably, the water-to-cement ratio in the water-adding wet mixing step is 0.25-0.35, and the mixing time is 5 minutes to 10 minutes.

[0027] Preferably, polymer emulsion is an optional additive.

[0028] The present invention provides a method for preparing a phosphogypsum-based water-stable material. The method has the following beneficial effects:

[0029] 1. The present invention significantly improves the anti-cracking performance of the material by adding plant fiber and bentonite, which can effectively prevent cracks caused by shrinkage or temperature changes, and at the same time enhances the ability to resist water penetration, making it suitable for humid environments and underground projects.

[0030] 2. The use of active materials such as silica fume, slag powder and fly ash in the present invention promotes hydration reaction and generates more gelling substances, thereby improving the compressive strength and long-term durability of the material and meeting the high requirements of the project on material performance.

[0031] 3. The present invention uses additives such as superplasticizers to improve the fluidity of materials, which is convenient for construction. At the same time, the use of industrial by-products (phosphogypsum and fly ash) as main components helps reduce waste and is in line with the concept of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic flow chart of the preparation steps of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Please see attached Figure 1 , an embodiment of the present invention provides a phosphogypsum-based water-stable material, including 40 parts to 60 parts of phosphogypsum;

[0035] Cement 15-25 parts;

[0036] 5-10 parts of lime;

[0037] 10-20 parts of fly ash;

[0038] Silica fume 5-10 parts;

[0039] 10-20 parts of slag powder;

[0040] 3-7 parts of bentonite;

[0041] 0.5-1.5 parts of plant fiber, the plant fiber is treated straw fiber or wood fiber, the waterproofing agent is a silane waterproofing agent, the water repellent is a siloxane water repellent, and the superplasticizer is a polycarboxylic acid superplasticizer;

[0042] Waterproofing agent, water repellent, superplasticizer 1-5 parts.

[0043] 5-15 parts of polymer emulsion, which is an optional additive.

[0044] A method for preparing a phosphogypsum-based water-stable material comprises the following steps:

[0045] S1. Initial mixing of dry materials: Phosphogypsum, cement, lime, fly ash, silica fume, slag powder and bentonite are put into a mixer in proportion and dry mixed for 5 to 10 minutes. In the dry mixing step, high-efficiency mixing equipment is used for mixing, and the mixer is a double-shaft mixer or a forced mixer to ensure uniform mixing of dry and wet materials;

[0046] S2. Adding plant fiber: After the dry materials are evenly mixed, add the treated plant fiber and continue stirring for 3 minutes to 5 minutes. The plant fiber is surface treated before being added, and its length is 5 mm to 10 mm;

[0047] S3. Adding admixtures: After the dry material and the plant fiber are evenly mixed, add admixtures such as waterproofing agent, superplasticizer, and water repellent, and continue stirring for 2 minutes to 3 minutes. The admixtures include waterproofing agent, water repellent, and superplasticizer;

[0048] S4. Add water and wet mix: gradually add water and continue stirring for 5 minutes to 10 minutes to form a uniform wet mix. The water-to-binder ratio of the water-to-binder step is 0.25-0.35, and the stirring time is 5 minutes to 10 minutes.

[0049] In order to intuitively demonstrate the influence of different proportions of various materials on the phosphogypsum base, the following six embodiments are provided, and the thickness proportions of the materials used in the embodiments are shown in the following table:

[0050]

[0051]

[0052] The effects of phosphogypsum under the material ratios of various embodiments are shown in the following table (the effects are represented by 1-5, 5 represents the best effect):

[0053] Example strength Water resistance Liquidity toughness Durability Adaptability one 5 5 3 4 5 5 two 4 4 5 3 3 4 three 3 3 4 3 4 3 Four 4 5 3 3 5 5 five 4 4 4 5 4 4 six 4 3 3 4 4 3

[0054] Rating explanation

[0055] Strength: compressive strength of the material and overall structural stability;

[0056] Water resistance: the ability of a material to resist water intrusion and water erosion;

[0057] Fluidity: the maneuverability and flowability of materials during construction;

[0058] Toughness: the material’s resistance to impact and deformation;

[0059] Durability: The ability of a material to maintain its performance over long periods of use;

[0060] Adaptability: The flexibility of the material to suit different construction environments and conditions.

[0061] A detailed analysis of the advantages, disadvantages and applicable scenarios of each embodiment is conducted, and the most suitable embodiment is recommended according to specific engineering requirements. The results are as follows:

[0062] Embodiment 1:

[0063] Material ratio: phosphogypsum: 50 parts, cement: 20 parts, lime: 7 parts, fly ash: 15 parts, silica fume: 5 parts, slag powder: 10 parts, bentonite: 4 parts, plant fiber: 1 part, waterproofing agent: 3 parts, polymer emulsion: 10 parts.

[0064] Performance characteristics: Strength: 5, Water resistance: 5, Fluidity: 3, Toughness: 4, Durability: 5, Adaptability: 5.

[0065] Advantages:

[0066] High Strength: The high cement and phosphogypsum ratio of this embodiment gives the material an extremely high compressive strength, suitable for withstanding heavy traffic loads.

[0067] Excellent water resistance: The added polymer emulsion and bentonite provide excellent water resistance, which can effectively prevent water penetration and is suitable for humid environments.

[0068] Strong durability: The material performs well in long-term use and is suitable for applications that require long-term stability.

[0069] Disadvantages:

[0070] Average fluidity: Although it has certain fluidity, it may not be suitable for rapid construction needs, especially in situations where rapid paving is required.

[0071] Suitable for scenarios: high-load traffic roads: such as highways and urban main roads. Such roads need to withstand frequent heavy-duty vehicle traffic, so the strength and durability of the materials are required to be high.

[0072] Embodiment 2:

[0073] Material ratio: phosphogypsum: 45 parts, cement: 25 parts, lime: 6 parts, fly ash: 10 parts, silica fume: 6 parts, slag powder: 15 parts, bentonite: 5 parts, plant fiber: 0.5 parts, waterproofing agent: 4 parts, polymer emulsion: 5 parts.

[0074] Performance characteristics: Strength: 4, Water resistance: 4, Fluidity: 5, Toughness: 3, Durability: 3, Adaptability: 4.

[0075] Advantages:

[0076] Excellent fluidity: The formula of this embodiment optimizes fluidity, is very suitable for fast construction, and is convenient for laying in a short time.

[0077] Reasonable strength and water resistance: The use of appropriate cement and waterproofing agent makes it perform well in strength and water resistance, suitable for daily traffic needs.

[0078] Disadvantages:

[0079] Less durable: May not perform as well as other embodiments in extreme environments, especially if exposed to moisture for long periods of time.

[0080] Suitable for:

[0081] Fast construction projects: such as urban road repairs and temporary construction sites. Its high fluidity enables rapid paving, making it suitable for emergency construction or time-sensitive projects.

[0082] Embodiment three:

[0083] Material ratio: phosphogypsum: 60 parts, cement: 15 parts, lime: 5 parts, fly ash: 12 parts, silica fume: 4 parts, slag powder: 10 parts, bentonite: 3 parts, plant fiber: 1.5 parts, waterproofing agent: 2 parts, polymer emulsion: 0 parts.

[0084] Performance characteristics: Strength: 3, Water resistance: 3, Fluidity: 4, Toughness: 3, Durability: 4, Adaptability: 3.

[0085] Advantages:

[0086] Economical: Using a higher proportion of phosphogypsum can effectively reduce material costs.

[0087] Good fluidity: suitable for general construction requirements, easy to mix and construct, and reduces construction difficulty.

[0088] Disadvantages:

[0089] Low strength and water resistance: Inadequate performance under heavy traffic or in wet conditions, limiting its application scenarios.

[0090] Suitable for:

[0091] Ordinary traffic roads: suitable for urban secondary roads and residential roads. It can meet the needs of daily use, but it does not perform well under heavy load conditions.

[0092] Embodiment 4:

[0093] Material ratio: phosphogypsum: 40 parts, cement: 20 parts, lime: 10 parts, fly ash: 20 parts, silica fume: 5 parts, slag powder: 15 parts, bentonite: 3 parts, plant fiber: 1 part, waterproofing agent: 5 parts, polymer emulsion: 0 parts.

[0094] Performance characteristics: Strength: 4, Water resistance: 5, Fluidity: 3, Toughness: 3, Durability: 5, Adaptability: 5.

[0095] Advantages:

[0096] Excellent water resistance: Due to the high proportion of bentonite and waterproofing agent, it can effectively prevent water penetration and is suitable for humid environments.

[0097] Strong durability: Excellent performance in wet environments, suitable for long-term use.

[0098] Disadvantages:

[0099] Moderate Strength: Although it has good strength, it is not suitable for applications subject to extremely high loads.

[0100] Suitable for:

[0101] Wet environment and underground projects: such as underground parking lots and drainage systems, which require strong water resistance. This embodiment maintains good performance under long-term wet conditions.

[0102] Implementation Five:

[0103] Material ratio: phosphogypsum: 55 parts, cement: 18 parts, lime: 6 parts, fly ash: 13 parts, silica fume: 5 parts, slag powder: 12 parts, bentonite: 4 parts, plant fiber: 1 part, waterproofing agent: 3 parts, polymer emulsion: 12 parts.

[0104] Performance characteristics: Strength: 4, Water resistance: 4, Fluidity: 4, Toughness: 5, Durability: 4, Adaptability: 4.

[0105] Advantages:

[0106] Excellent toughness: suitable for areas subject to dynamic loads, able to effectively cope with traffic vibration and impact, and reduce the risk of structural damage.

[0107] Good overall performance: The balanced ratio enables it to perform stably under a variety of conditions.

[0108] Disadvantages:

[0109] The fluidity is relatively average: it may be slightly insufficient in fast construction scenarios and requires appropriate adjustments during construction.

[0110] Suitable for:

[0111] Bridges and areas subject to dynamic loads: Such as bridge construction and other structures subject to dynamic loads. The toughness of this embodiment can effectively cope with traffic vibrations.

[0112] Embodiment six:

[0113] Material ratio: phosphogypsum: 50 parts, cement: 22 parts, lime: 8 parts, fly ash: 10 parts, silica fume: 5 parts, slag powder: 10 parts, bentonite: 6 parts, plant fiber: 1 part, waterproofing agent: 4 parts, polymer emulsion: 0 parts.

[0114] Performance characteristics: Strength: 4, Water resistance: 3, Fluidity: 3, Toughness: 4, Durability: 4, Adaptability: 3.

[0115] Advantages:

[0116] Good overall performance: balanced performance in various indicators, suitable for a variety of conventional applications.

[0117] Strong adaptability: can be flexibly used on general roads and non-heavy-load occasions.

[0118] Disadvantages:

[0119] Less water resistant: Does not perform as well as other embodiments in extremely humid environments and may require additional waterproofing.

[0120] Suitable for:

[0121] General roads and non-heavy-load applications: Suitable for municipal roads, sidewalks and other non-heavy-load applications, and can meet daily traffic needs.

[0122]

[0123] The above examples demonstrate the flexibility and applicability of phosphogypsum-based water-stabilizing materials in different application scenarios. By changing the ratio of different materials, we can meet different engineering requirements to ensure that the performance of the materials reaches the best effect. We can make independent choices based on the requirements of strength, water resistance, fluidity, durability and economy to achieve the ideal construction effect.

[0124] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A phosphogypsum-based water-stable material, characterized in that: Includes the following parts by weight: 40-60 parts of phosphogypsum; Cement 15-25 parts; 5-10 parts of lime; 10-20 parts of fly ash; Silica fume 5-10 parts; 10-20 parts of slag powder; 3-7 parts of bentonite; 0.5-1.5 parts of plant fiber; Waterproofing agent, water repellent, superplasticizer 1-5 parts.

2. The phosphogypsum-based water-stable material according to claim 1, characterized in that: The plant fiber is processed straw fiber or wood fiber.

3. The phosphogypsum-based water-stable material according to claim 1, characterized in that: The waterproofing agent is a silane waterproofing agent, the water repellent is a siloxane water repellent, and the superplasticizer is a polycarboxylic acid superplasticizer.

4. The phosphogypsum-based water-stable material according to claim 1, characterized in that: The material also includes 5 to 15 parts of polymer emulsion.

5. A method for preparing a phosphogypsum-based water-stable material, characterized in that: Using the phosphogypsum-based water-stabilizing material according to any one of claims 1 to 4 comprises the following steps: S1. Initial mixing of dry materials: Phosphogypsum, cement, lime, fly ash, silica fume, slag powder and bentonite are put into a mixer in proportion and dry mixed for 5 minutes to 10 minutes; S2. Adding plant fiber: After the dry materials are evenly mixed, add the treated plant fiber and continue stirring for 3 minutes to 5 minutes; S3. Adding admixtures: After the dry material and plant fiber are evenly mixed, add admixtures such as waterproofing agent, superplasticizer, and water repellent, and continue stirring for 2 minutes to 3 minutes; S4. Add water and wet mix: gradually add water while continuously stirring for 5 minutes to 10 minutes to form a uniform wet mix.

6. The method for preparing a phosphogypsum-based water-stable material according to claim 5, characterized in that: In the dry mixing step, a high-efficiency stirring device is used for stirring, and the stirrer is a double-shaft mixer or a forced mixer to ensure uniform mixing of the dry material and the wet material.

7. The method for preparing a phosphogypsum-based water-stable material according to claim 5, characterized in that: The plant fibers are surface treated before being added and have a length of 5 mm to 10 mm.

8. The method for preparing a phosphogypsum-based water-stable material according to claim 5, characterized in that: The additives include waterproofing agent, water repellent and superplasticizer.

9. The method for preparing a phosphogypsum-based water-stable material according to claim 5, characterized in that: The water-to-cement ratio in the water-adding wet mixing step is 0.25-0.35, and the mixing time is 5 minutes to 10 minutes.

10. The method for preparing a phosphogypsum-based water-stable material according to claim 5, characterized in that: Polymer emulsions are optional additions.

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