Low-energy-consumption concrete suitable for fabricated structure and preparation method of low-energy-consumption concrete

Abstract

The invention provides low-energy-consumption concrete suitable for a fabricated structure and a preparation method of the low-energy-consumption concrete, and relates to the technical field of concrete. The low-energy-consumption concrete suitable for the fabricated structure is prepared from the following raw materials in parts by weight: 1000 to 1200 kg / m < 3 > of a cementing material, 1100 to 1200 kg / m < 3 > of an aggregate, 25 to 30 kg / m < 2 > of fibers, 10 to 15 kg / m < 2 > of hydrated calcium silicate whiskers, 160 to 170 kg / m < 3 > of water, 5 to 15 kg / m < 3 > of a bio-based water reducing agent and 5 to 10 kg / m < 2 > of biochar. The environment burden can be greatly reduced and the sustainability can be improved by using the geopolymer, the recycled aggregate and the bio-based material, and the crack resistance, the strength and the durability of the concrete are improved by introducing the novel fibers and the activated carbon.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, and in particular to low-energy consumption concrete suitable for assembled structures and a preparation method thereof. Background Art

[0002] Prefabricated structure is a form of building structure that is achieved by prefabricating components in a factory and then transporting them to the construction site for assembly. This form of structure is highly standardized and engineered, which can greatly improve construction efficiency and quality and reduce the impact on the construction site. Prefabricated structures can include prefabricated concrete components, steel structure components, wooden structure components, etc., and are widely used in residential, commercial buildings, industrial plants and other fields. This form of structure can meet the requirements of rapid construction and sustainable development, so it has been increasingly widely used in the field of modern construction; low-energy concrete used for prefabricated structures refers to a special concrete material that uses high-efficiency energy-saving measures in the production and application of concrete to reduce energy consumption and environmental load.

[0003] In the prior art, the materials used in traditional concrete formulas and their proportions are relatively simple, and there is a lack of optimized design for concrete performance. At the same time, the traditional method lacks the use of high-performance chemical additives and advanced reinforcing materials, which limits the strength and durability of concrete. The traditional method does not fully consider the impact of concrete shrinkage and temperature changes on concrete. There is a lack of measures to improve crack resistance, such as adding concrete crack control agents and fiber reinforcement materials, which can easily cause the strength of prefabricated structures to decrease. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a low-energy consumption concrete suitable for prefabricated structures and a preparation method thereof, which solves the problems of limited strength and durability of concrete and lack of measures to improve crack resistance.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented by the following technical scheme: a low-energy consumption concrete suitable for prefabricated structures, comprising the following raw materials: cementitious material, aggregate, fiber, hydrated calcium silicate whisker, water, bio-based water reducer and biochar, wherein the weight ratio is as follows: cementitious material 1000-1200kg / m 3 Aggregate 1100-1200kg / m 3 , fiber 25-30kg / m 2 , hydrated calcium silicate whisker 10-15kg / m 2 , water 160-170kg / m3 , bio-based water reducing agent 5-15kg / m 3 , biochar 5-10kg / m 2 ;

[0008] The cementitious material includes geopolymer, cement and silica fume, the aggregate includes recycled aggregate, quartz sand and fine sand, and the fiber includes carbon fiber.

[0009] Preferably, the weight ratio is as follows: 800kg geopolymer, 200kg cement, 50kg silica fume, 500kg / m recycled aggregate 3 , quartz sand 400kg / m 3 , fine sand 200kg / m 3 , carbon fiber 25kg / m 2 , hydrated calcium silicate whisker 10kg / m 2 , water 160kg / m 3 , bio-based water reducing agent 5kg / m 3 , biochar 5kg / m 2 .

[0010] Preferably, the weight ratio is as follows: 820kg geopolymer, 220kg cement, 60kg silica fume, 540kg / m recycled aggregate 3 , quartz sand 440kg / m 3 , fine sand 220kg / m 3 , carbon fiber 28kg / m 2 , hydrated calcium silicate whisker 13kg / m 2 , water 165kg / m 3 , bio-based water reducing agent 10kg / m 3 , biochar 8kg / m 2 .

[0011] Preferably, the weight ratio is as follows: 860kg geopolymer, 260kg cement, 80kg silica fume, 520kg / m recycled aggregate 3 , quartz sand 420kg / m 3 , fine sand 210kg / m 3 , carbon fiber 30kg / m 2 , hydrated calcium silicate whisker 15kg / m 2 , water 170kg / m 3 , bio-based water reducing agent 15kg / m 3 , biochar 10kg / m 2 .

[0012] Preferably, a method for preparing low-energy concrete suitable for assembled structures comprises the following steps:

[0013] S1. Preprocessing and Measurement

[0014] Pre-measure and prepare the required materials, including geopolymers, cement, silica fume, recycled aggregates, quartz sand, fine sand, carbon fiber, activated carbon, hydrated calcium silicate whiskers and bio-based water reducer;

[0015] S2. Preparation of mixture

[0016] Put the dry powder materials such as geopolymer, cement, silica fume, recycled aggregate, quartz sand and fine sand into the concrete mixer according to the proportion;

[0017] S3. Add additives

[0018] Add carbon fibers, activated carbon, and hydrated calcium silicate whiskers to the mixture, ensuring full and even distribution during mixing;

[0019] S4. Stirring and mixing

[0020] Start the concrete mixer and mix it, while gradually adding concrete mixing water and gradually adding bio-based water reducer until the mixture is uniform and moist;

[0021] S5.Concrete quality control

[0022] Monitor the temperature and humidity during the mixing process to ensure that the concrete is uniform in texture and no large particles remain. Adjust the mixing time to ensure that the concrete is mixed evenly.

[0023] (III) Beneficial effects

[0024] The present invention provides a low-energy consumption concrete suitable for assembled structures and a preparation method thereof. It has the following beneficial effects:

[0025] 1. The present invention provides a low-energy concrete suitable for prefabricated structures and a preparation method thereof, which is more environmentally friendly: by using geopolymers, recycled aggregates and bio-based materials, the environmental burden can be greatly reduced and sustainability can be improved, and the introduction of new fibers and activated carbon can improve the crack resistance, strength and durability of concrete.

[0026] 2. The present invention provides a low-energy concrete suitable for prefabricated structures and a preparation method thereof. By using recycled materials and bio-based materials, the material cost can be effectively reduced and the dependence on natural resources can be alleviated. At the same time, the use of new materials may give concrete new functional properties, such as better impermeability and durability, and adapt to various engineering needs. Ultimately, the upgraded formula can further promote the development of green building materials while ensuring performance and economy. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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.

[0028] The embodiment of the present invention provides a low-energy consumption concrete suitable for prefabricated structures, comprising the following raw materials: cementitious material, aggregate, fiber, calcium silicate hydrate whisker, water, bio-based water reducer and biochar, wherein the weight ratio is as follows: cementitious material 1000-1200kg / m 3 Aggregate 1100-1200kg / m 3 , fiber 25-30kg / m 2 , hydrated calcium silicate whisker 10-15kg / m 2 , water 160-170kg / m 3 , bio-based water reducing agent 5-15kg / m 3 , biochar 5-10kg / m 2 ;

[0029] The cementitious materials include geopolymer, cement and silica fume, the aggregates include recycled aggregate, quartz sand and fine sand, and the fibers include carbon fibers.

[0030] Specifically, a method for preparing low-energy concrete suitable for assembled structures comprises the following steps:

[0031] S1. Preprocessing and Measurement

[0032] Pre-measure and prepare the required materials, including geopolymers, cement, silica fume, recycled aggregates, quartz sand, fine sand, carbon fiber, activated carbon, hydrated calcium silicate whiskers and bio-based water reducer;

[0033] S2. Preparation of mixture

[0034] Put the dry powder materials such as geopolymer, cement, silica fume, recycled aggregate, quartz sand and fine sand into the concrete mixer according to the proportion;

[0035] S3. Add additives

[0036] Add carbon fibers, activated carbon, and hydrated calcium silicate whiskers to the mixture, ensuring full and even distribution during mixing;

[0037] S4. Stirring and mixing

[0038] Start the concrete mixer and mix it, while gradually adding concrete mixing water and gradually adding bio-based water reducer until the mixture is uniform and moist;

[0039] S5.Concrete quality control

[0040] Monitor the temperature and humidity during the mixing process to ensure that the concrete is uniform in texture and no large particles remain. Adjust the mixing time to ensure that the concrete is mixed evenly.

[0041] Example 1

[0042] The weight ratio is as follows: geopolymer 800kg, cement 200kg, silica fume 50kg, recycled aggregate 500kg / m 3 , quartz sand 400kg / m 3 , fine sand 200kg / m 3 , carbon fiber 25kg / m 2 , hydrated calcium silicate whisker 10kg / m 2 , water 160kg / m 3 , bio-based water reducing agent 5kg / m 3 , biochar 5kg / m 2 .

[0043] Preparation steps

[0044] Mixing gelling materials: Weigh the gelling materials according to the above recipe in a blender, mix well and sieve to avoid lumps.

[0045] Add aggregate: gradually add the divided aggregate into the mixer and mix evenly.

[0046] Add water: Slowly add clean water according to the required water ratio and set the stirring time to 3-5 minutes to ensure uniform mixing.

[0047] Add fibers and hydrated calcium silicate whiskers: Add carbon fibers and hydrated calcium silicate whiskers separately and continue stirring for 2-3 minutes.

[0048] Add bio-based water reducer: Add bio-based water reducer into the mixer according to the proportion and stir until mixed evenly.

[0049] Add biochar: Add biochar evenly during stirring.

[0050] Final stirring: Continue stirring until all ingredients are evenly distributed to ensure consistency.

[0051] Casting and curing

[0052] Pouring: Pour the mixed low-energy concrete into the mold and vibrate it appropriately to eliminate air bubbles.

[0053] Curing: Carry out proper curing immediately after pouring, keeping the blocks moist for at least 7 days.

[0054] Example 2

[0055] The weight ratio is as follows: geopolymer 820kg, cement 220kg, silica fume 60kg, recycled aggregate 540kg / m 3 , quartz sand 440kg / m 3 , fine sand 220kg / m 3 , carbon fiber 28kg / m 2 , hydrated calcium silicate whisker 13kg / m 2 , water 165kg / m 3 , bio-based water reducing agent 10kg / m 3 , biochar 8kg / m 2 .

[0056] Preparation steps

[0057] Mixing gelling materials: Weigh the gelling materials according to the above recipe in a blender, mix well and sieve to avoid lumps.

[0058] Add aggregate: gradually add the divided aggregate into the mixer and mix evenly.

[0059] Add water: Slowly add clean water according to the required water ratio and set the stirring time to 3-5 minutes to ensure uniform mixing.

[0060] Add fibers and hydrated calcium silicate whiskers: Add carbon fibers and hydrated calcium silicate whiskers separately and continue stirring for 2-3 minutes.

[0061] Add bio-based water reducer: Add bio-based water reducer into the mixer according to the proportion and stir until mixed evenly.

[0062] Add biochar: Add biochar evenly during stirring.

[0063] Final stirring: Continue stirring until all ingredients are evenly distributed to ensure consistency.

[0064] Casting and curing

[0065] Pouring: Pour the mixed low-energy concrete into the mold and vibrate it appropriately to eliminate air bubbles.

[0066] Curing: Carry out proper curing immediately after pouring, keeping the blocks moist for at least 7 days.

[0067] Example 3

[0068] The weight ratio is as follows: geopolymer 860kg, cement 260kg, silica fume 80kg, recycled aggregate 520kg / m 3 , quartz sand 420kg / m 3 , fine sand 210kg / m 3 , carbon fiber 30kg / m 2, hydrated calcium silicate whisker 15kg / m 2 , water 170kg / m 3 , bio-based water reducing agent 15kg / m 3 , biochar 10kg / m 2 .

[0069] Preparation steps

[0070] Mixing gelling materials: Weigh the gelling materials according to the above recipe in a blender, mix well and sieve to avoid lumps.

[0071] Add aggregate: gradually add the divided aggregate into the mixer and mix evenly.

[0072] Add water: Slowly add clean water according to the required water ratio and set the stirring time to 3-5 minutes to ensure uniform mixing.

[0073] Add fibers and hydrated calcium silicate whiskers: Add carbon fibers and hydrated calcium silicate whiskers separately and continue stirring for 2-3 minutes.

[0074] Add bio-based water reducer: Add bio-based water reducer into the mixer according to the proportion and stir until mixed evenly.

[0075] Add biochar: Add biochar evenly during stirring.

[0076] Final stirring: Continue stirring until all ingredients are evenly distributed to ensure consistency.

[0077] Casting and curing

[0078] Pouring: Pour the mixed low-energy concrete into the mold and vibrate it appropriately to eliminate air bubbles.

[0079] Curing: Carry out proper curing immediately after pouring, keeping the blocks moist for at least 7 days.

[0080] Experimental data and results

[0081]

[0082] Results Analysis

[0083] Fluidity: Example 3 has the highest fluidity, reaching 265 mm, indicating that adding the bio-based water reducer effectively improves the workability of the concrete.

[0084] Compressive strength: The 28-day compressive strength of Example 3 is 37.5 MPa, which is about 22.95% higher than the 30.5 MPa of Formula A, demonstrating the effectiveness of adding bio-based water reducer in enhancing the strength of concrete.

[0085] Flexural strength: The flexural strength of Example 3 reaches 6.2 MPa, which is the highest among the three formulations, indicating that the improved formulation has more advantages in load-bearing capacity.

[0086] Shrinkage and moisture content: Example 3 exhibits the lowest shrinkage and moisture content, demonstrating its stability and crack resistance under dry conditions.

[0087] Through three sets of comparative experiments, Example 3 is superior to Example 1 and Example 2 in terms of workability and mechanical properties. The experimental results show that by increasing the use of bio-based water reducer, the performance of low-energy concrete can be effectively improved, which provides a good material basis for future prefabricated structure applications.

[0088] 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 low-energy concrete suitable for assembled structures, characterized in that: The raw materials include cementitious materials, aggregates, fibers, hydrated calcium silicate whiskers, water, bio-based water reducer and biochar, of which the weight ratio is as follows: cementitious materials 1000-1200kg / m 3 Aggregate 1100-1200kg / m 3 , fiber 25-30kg / m 2 , hydrated calcium silicate whisker 10-15kg / m 2 , water 160-170kg / m 3 , bio-based water reducing agent 5-15kg / m 3 , biochar 5-10kg / m 2 ; The cementitious material includes geopolymer, cement and silica fume, the aggregate includes recycled aggregate, quartz sand and fine sand, and the fiber includes carbon fiber.

2. The low-energy concrete suitable for prefabricated structures according to claim 1, characterized in that: The weight ratio is as follows: geopolymer 800kg, cement 200kg, silica fume 50kg, recycled aggregate 500kg / m 3 , quartz sand 400kg / m 3 , fine sand 200kg / m 3 , carbon fiber 25kg / m 2 , hydrated calcium silicate whisker 10kg / m 2 , water 160kg / m 3 , bio-based water reducing agent 5kg / m 3 , biochar 5kg / m 2 .

3. The low-energy concrete suitable for prefabricated structures according to claim 1, characterized in that: The weight ratio is as follows: geopolymer 820kg, cement 220kg, silica fume 60kg, recycled aggregate 540kg / m 3 , quartz sand 440kg / m 3 , fine sand 220kg / m 3 , carbon fiber 28kg / m 2 , hydrated calcium silicate whisker 13kg / m 2 , water 165kg / m 3 , bio-based water reducing agent 10kg / m 3 , biochar 8kg / m 2 .

4. The low-energy concrete suitable for prefabricated structures according to claim 1, characterized in that: The weight ratio is as follows: geopolymer 860kg, cement 260kg, silica fume 80kg, recycled aggregate 520kg / m 3 , quartz sand 420kg / m 3 , fine sand 210kg / m 3 , carbon fiber 30kg / m 2 , hydrated calcium silicate whisker 15kg / m 2 , water 170kg / m 3 , bio-based water reducing agent 15kg / m 3 , biochar 10kg / m 2 .

5. A method for preparing low-energy concrete suitable for assembled structures, characterized in that: The steps include: S1. Preprocessing and Measurement Pre-measure and prepare the required materials, including geopolymers, cement, silica fume, recycled aggregates, quartz sand, fine sand, carbon fiber, activated carbon, hydrated calcium silicate whiskers and bio-based water reducer; S2. Preparation of mixture Put the dry powder materials such as geopolymer, cement, silica fume, recycled aggregate, quartz sand and fine sand into the concrete mixer according to the proportion; S3. Add additives Add carbon fibers, activated carbon, and hydrated calcium silicate whiskers to the mixture, ensuring full and even distribution during mixing; S4. Stirring and mixing Start the concrete mixer and mix it, while gradually adding concrete mixing water and gradually adding bio-based water reducer until the mixture is uniform and moist; S5.Concrete quality control Monitor the temperature and humidity during the mixing process to ensure that the concrete is uniform in texture and no large particles remain. Adjust the mixing time to ensure that the concrete is mixed evenly.

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