Low-carbon high-strength concrete based on green 5S process technology aggregate and preparation method of low-carbon high-strength concrete

Abstract

The invention relates to low-carbon high-strength concrete based on green 5S process technology aggregate and a preparation method of the low-carbon high-strength concrete, and relates to the technical field of high-performance building materials. Through the synergistic effect between the green 5S process technology aggregate and the optimized gel system, the low-carbon high-strength concrete can obviously reduce the carbon emission per unit cubic meter on the premise of ensuring that the 28-day strength is not lower than 69MPa and the self-compacting performance is met.

Description

Technical Field

[0001] This invention relates to the field of high-performance building materials technology, and specifically to a low-carbon, high-strength concrete based on green 5S process technology aggregates and its preparation method. Background Technology

[0002] Modern building structures are developing towards high-rise and large-span structures, placing higher demands on concrete strength (C60 and above) and workability (self-compacting). Traditional high-strength concrete typically employs a high cementitious material content (usually ≥500 kg / m²) to achieve both high strength and self-compacting properties. 3 High cement content and high hydration heat lead to large shrinkage deformation, easy cracking, and persistently high carbon emission intensity in self-compacting concrete. Meanwhile, ordinary aggregates struggle to achieve a balance between fluidity and segregation resistance in low-slurry-volume self-compacting concrete. Therefore, developing a concrete that combines ultra-high strength, excellent self-compacting properties, and low carbon emissions is a pressing technical challenge in this field. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a low-carbon, high-strength concrete based on green 5S process technology aggregates. Through the synergistic effect between the green 5S process technology aggregates and the optimized gel system, this low-carbon, high-strength concrete can significantly reduce carbon emissions per cubic meter while ensuring a 28-day strength of not less than 69 MPa and meeting self-compacting performance requirements.

[0004] This invention provides a low-carbon, high-strength concrete based on aggregates using green 5S process technology. The raw materials for preparing this low-carbon, high-strength concrete include the following raw materials in the following mass ratio:

[0005] Each cubic meter of low-carbon high-strength concrete comprises 2200-2665 kg of the aforementioned raw materials.

[0006] In one embodiment, the cementitious material system comprises raw materials in the following mass ratio:

[0007] In one embodiment, the cementitious material system comprises raw materials in the following mass ratio:

[0008] In one embodiment, the green 5S process technology aggregate comprises raw materials in the following mass ratio:

[0009] The green 5S process technology manufactured sand is manufactured sand obtained by the five-double fully dry crushing and processing method, and the green 5S process technology rice stone is rice stone obtained by the five-double fully dry crushing and processing method.

[0010] The green 5S process technology in this invention is the five-double fully dry crushing and processing method, specifically the five-double fully dry crushing and processing method in the invention patent application number 201910151620.8, "A high-quality sand and gravel aggregate five-double fully dry crushing production line and processing method".

[0011] In one embodiment, the green 5S process technology aggregate comprises raw materials in the following mass ratio:

[0012] In one embodiment, the cement comprises PO 52.5 cement, the fly ash comprises Class II fly ash, and the mineral powder comprises S95 grade mineral powder.

[0013] In one embodiment, the particle size of the manufactured sand produced by the Green 5S process technology is ≤5mm, and the particle size of the gravel produced by the Green 5S process technology is 5-10mm.

[0014] The present invention also provides a method for preparing the low-carbon high-strength concrete, comprising the following steps: weighing the raw materials for preparing the low-carbon high-strength concrete, stirring evenly, and thus obtaining the concrete.

[0015] The present invention also provides a high-strength reinforced concrete structure, including reinforcing bars and the aforementioned low-carbon high-strength concrete.

[0016] The present invention also provides the application of the aforementioned low-carbon high-strength concrete in high-strength reinforced concrete structures.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a low-carbon high-strength concrete based on green 5S process technology aggregate and its preparation method. Through the synergistic effect between green 5S process technology aggregate and optimized gel system, the low-carbon high-strength concrete can significantly reduce carbon emissions per cubic meter while ensuring a 28-day strength of not less than 69 MPa and meeting self-compacting performance. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to relevant embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] Unless otherwise specified, all reagents, materials, and equipment used in this embodiment are commercially available; unless otherwise specified, all test methods are conventional test methods in this field.

[0021] Example Low-carbon high-strength concrete based on green 5S process technology aggregates and its preparation method.

[0022] I. Each cubic meter of low-carbon, high-strength concrete based on green 5S process technology aggregate is composed of the following raw materials by weight:

[0023] Cementitious material system: 470 kg, including: PO 52.5 cement: 250 kg, Grade II fly ash: 120 kg, Grade S95 mineral powder: 100 kg; Green 5S process technology aggregate system: Green 5S process technology manufactured sand (0-5mm): 700 kg, Green 5S process technology gravel (5-10mm): 1100 kg; Water: 145 kg; High-performance water-reducing agent: 12.0 kg, specifically a polycarboxylate-based high-performance water-reducing agent.

[0024] The low-carbon high-strength concrete has a water-cement ratio of 0.31, a sand ratio of 39%, and a mass ratio of cement, fly ash, mineral powder, green 5S process technology manufactured sand, green 5S process technology gravel, tap water, and high-performance water-reducing agent of 250:120:100:700:1100:145:12.

[0025] The high cleanliness, excellent particle shape, controllable fineness modulus, adjustable stone powder content, rich product variety, and high stability of the aforementioned green 5S process technology aggregate system all stem from its "five-double" integrated process (i.e., the five-double all-dry crushing and processing method): "double desliming" ensures cleanliness, "double impact and double shock" optimizes particle shape and achieves controllable crushing, "double circulation" improves efficiency and flexibility, and "double powder selection" precisely controls stone powder content and gradation, ultimately achieving product diversification and quality uniformity.

[0026] In this embodiment, the five-double dry crushing processing method is specifically the five-double dry crushing processing method in the invention patent "A high-quality sand and gravel aggregate five-double dry crushing production line and processing method" with application number 201910151620.8.

[0027] II. Preparation method.

[0028] Weigh the ingredients according to the above proportions and mix them evenly using a forced mixer.

[0029] III. Performance Verification.

[0030] 1. Testing method: Testing shall be conducted in accordance with GB / T50080-2016.

[0031] 2. Test Results: The low-carbon high-strength concrete prepared in this embodiment has a slump spread greater than 600mm and a T500 time of less than 5 seconds, exhibiting excellent self-compacting properties. After 28 days of standard curing, its compressive strength reaches 69MPa.

[0032] IV. The low-carbon high-strength concrete of this embodiment has the following significant advantages.

[0033] 1. Core advantage: The combination of high strength and ultra-low carbon emissions.

[0034] This embodiment optimizes the cementitious material system, controlling the total cementitious material usage to 470 kg / m³, with cement usage at only 250 kg / m³. Compared to conventional C60 self-compacting concrete (total cementitious material ≥ 500 kg, cement ≥ 300 kg), the carbon emissions of this cementitious material system can be reduced by more than 25%, achieving a significant breakthrough in carbon emission reduction at high strength levels.

[0035] 2. Key technologies: Green 5S process technology enables aggregates to achieve excellent workability with low sand ratio.

[0036] This embodiment uses a combination of 5-10mm aggregate and manufactured sand produced using the Green 5S process technology, resulting in an extremely low sand ratio (39%). The excellent particle shape and gradation of the aggregates produced by the Green 5S process technology greatly improve the friction and interference effects between aggregates, enabling the concrete to achieve extremely high fluidity and excellent anti-segregation properties even with low paste volume and low sand ratio. It can achieve self-compacting effect without vibration, meeting the requirements for casting complex structures.

[0037] 3. Synergistic effect: The dual contribution of dense framework and active powder.

[0038] The tightly packed aggregate structure of the green 5S process technology provides a solid mechanical foundation; while the pozzolanic effect of the high-volume active admixture (46.8% fly ash and mineral powder combined) further optimizes the interfacial transition zone and fills the micropores. Together, they ensure the ultra-high strength (28-day compressive strength of 69 MPa) and excellent durability of the concrete.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A low-carbon, high-strength concrete based on green 5S process technology aggregate, characterized in that, The raw materials for preparing this low-carbon, high-strength concrete include the following raw materials in the following mass ratio: Each cubic meter of low-carbon high-strength concrete comprises 2200-2665 kg of the aforementioned raw materials.

2. The low-carbon high-strength concrete according to claim 1, characterized in that, The cementitious material system comprises the following raw materials in the following mass ratios: 。 3. The low-carbon high-strength concrete according to claim 2, characterized in that, The cementitious material system comprises the following raw materials in the following mass ratios: 。 4. The low-carbon high-strength concrete according to claim 1, characterized in that, The aggregates used in the green 5S process technology comprise the following raw materials in the following mass ratios: The green 5S process technology manufactured sand is manufactured sand obtained by the five-double fully dry crushing and processing method, and the green 5S process technology rice stone is rice stone obtained by the five-double fully dry crushing and processing method.

5. The low-carbon high-strength concrete according to claim 4, characterized in that, The green 5S process technology sand and gravel includes the following raw materials in the following mass ratio: 。 6. The low-carbon high-strength concrete according to any one of claims 1-5, characterized in that, The cement includes P.O52.5 cement, the fly ash includes Class II fly ash, and the mineral powder includes S95 grade mineral powder.

7. The low-carbon high-strength concrete according to any one of claims 1-5, characterized in that, The particle size of the manufactured sand produced by the Green 5S process technology is ≤5mm, and the particle size of the gravel produced by the Green 5S process technology is 5-10mm.

8. The method for preparing low-carbon high-strength concrete according to any one of claims 1-7, characterized in that, The process includes the following steps: weighing the raw materials for preparing the low-carbon high-strength concrete, stirring them evenly, and then obtaining the final product.

9. A high-strength reinforced concrete structure, characterized in that, Includes steel reinforcement and low-carbon high-strength concrete as described in any one of claims 1-7.

10. The application of low-carbon high-strength concrete according to any one of claims 1-7 in high-strength reinforced concrete structures.

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