Square engineering aggregate super concrete containing hematite core and preparation method of square engineering aggregate super concrete
By combining hematite with square engineering aggregate and using vibration mixing technology to prepare super concrete, the brittle fracture problem of traditional concrete under explosion impact and seismic vibration is solved, and the explosion and shock resistance and wave absorption performance are improved.
Patent Information
- Application Number
- CN202510958015.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-11
- Publication Date
- 2025-09-16
AI Technical Summary
Traditional concrete materials have difficulty absorbing and dissipating energy effectively when faced with explosion impacts and earthquake vibrations, and are prone to brittle fracture and overall collapse. In addition, the preparation process of metamaterials is complex and difficult to apply to large-scale concrete projects.
Hematite is used as the core material and combined with square engineering aggregate to prepare superconcrete through vibration mixing technology. A local resonance band gap is formed to suppress impact, and combined with the wave absorption performance of hematite, the microstructure and durability of concrete are improved.
It achieves explosion-proof and shock-resistant effects under explosion impact and earthquake vibration, improves the wave absorption performance and overall performance of concrete, and the preparation method is simple, efficient and environmentally friendly.
Smart Images
Figure CN120647286A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of building engineering materials, and in particular to a hematite-containing square engineering aggregate superconcrete and a preparation method thereof. Background Art
[0002] Earthquakes and other man-made destructive events cause concrete structures to withstand the combined effects of blast impact loads and seismic activity. The structural vibrations caused by seismic activity not only cause casualties to personnel within the project, but also cause varying degrees of damage to instruments and equipment within the project. However, traditional materials have many limitations in terms of explosion and shock resistance. Most common building materials, such as concrete and steel, although they perform well in terms of conventional mechanical properties, often have difficulty effectively absorbing and dissipating energy when faced with the instantaneous, ultra-high pressure, extremely short action time, and complex stress wave propagation generated by blast impacts, making them prone to failures such as brittle fracture, excessive deformation, and even total collapse.
[0003] Unlike traditional materials, the application of certain metamaterials can achieve explosion resistance and shock resistance over a relatively wide frequency band. However, the current structural design and preparation process of these metamaterials limit their application on a large scale. At the same time, the preparation process is complex, making it difficult to apply to actual concrete engineering.
[0004] Ultraconcrete is a high-performance concrete that has developed rapidly in recent years, boasting superior mechanical properties and durability. Conventional ultraconcrete typically uses round aggregates, but the use of square aggregates can significantly improve the overall performance and compressive strength of concrete. The present invention aims to develop a new type of ultraconcrete by combining the properties of hematite and square aggregates. Summary of the Invention
[0005] The object of the present invention is to overcome the deficiencies in the prior art and provide a hematite-containing square engineering aggregate superconcrete, characterized in that hematite is used as a core material and combined with square engineering aggregate to form a concrete that can generate a local resonance band gap, achieve the effect of suppressing explosion and shock resistance, and has excellent wave absorbing properties, and has excellent workability, fluidity, cohesiveness and other working properties.
[0006] Another object of the present invention is to provide a method for preparing hematite-containing square engineering aggregate superconcrete, which is simple, efficient, environmentally friendly, and energy-efficient. The method is characterized by using hematite as the core material and combining it with square engineering aggregate to form a concrete with excellent microwave absorption properties.
[0007] Technical principle:
[0008] By replacing traditional conventional and forced mixing techniques with vibratory mixing, the use of vibration during mixing causes the cement particles to vibrate, breaking up cement agglomerates and ensuring uniform distribution. Vibratory mixing also increases the velocity of aggregate particles, increasing the number of effective collisions and accelerating the diffusion of hydration products from the aggregate surface into the liquid phase, accelerating cement hydration. This improves the coagulant gas content and distribution, significantly enhancing the concrete's microstructure and durability. Furthermore, it purifies the aggregate surface and strengthens the bond between cement and aggregate. Therefore, vibratory mixing can effectively improve the quality and mixing efficiency of hematite-containing square engineering aggregate superconcrete, and enhance the fluidity of fresh concrete.
[0009] Technical solution:
[0010] A hematite-containing square engineering aggregate superconcrete is prepared from cement, fly ash, quartz sand, square engineering aggregate, natural aggregate and water in a mass ratio of 1:0.286:1.5:1.073:1.818:0.369, with a water-cement ratio of 0.37.
[0011] The cement is P.042.5R ordinary Portland cement.
[0012] The method for preparing square engineering aggregate containing hematite ore comprises the following steps: Step A: Mix 150g of high-quality milky white silica gel and 1.5g of AB glue and place them into a specific mold. The mass ratio of silica gel to AB glue is 100:1. Step B: Hematite is also stuffed into the mold, with 1-2 pieces of hematite placed in each cube mold. The maximum particle size of the hematite is 10-20 mm. Step C: Smooth the surface of each cube mold. The mixed silicone and AB glue must completely cover the hematite. Let it stand for one day for the silicone to completely solidify, and you will have a square engineering aggregate containing hematite.
[0013] The hematite-containing square engineering aggregate superconcrete is characterized by: The core density of the square engineering aggregate containing hematite ore is 4500kg / m 3 , soft coating density 1000kg / m 3 ; The core side length is 16mm and the soft coating thickness is 2mm.
[0014] The hematite-containing square engineering aggregate superconcrete is characterized by: The square engineering aggregate containing hematite ore accounts for 24.4% of the total mass of the aggregate.
[0015] The natural aggregate particle size d2 is 5mm-16mm, continuously graded, and has a bulk density of 1520-1594kg / m 3 , the crushing index is 10.73%-12.7%, the water absorption rate is 1.70%-2.37%, and the moisture content is 0.29%-0.30%.
[0016] The particle size mass distribution of the natural aggregate is as follows: the natural aggregate particle size d2 is 5mm-10mm, and its mass fraction is 30%-40%; the natural coarse aggregate particle size d2 is 10mm-15mm, and its mass fraction is 40%-50%; the natural coarse aggregate particle size d2 is 15mm-16mm, and its mass fraction is 10%-20%.
[0017] The natural aggregate includes natural river sand, the particle size d3 of the natural aggregate is 0.35mm-0.5mm, the gradation is continuous, and the bulk density is 1426-1480kg / m 3 , water absorption rate is 4.23%-5.62%, and moisture content is 2.86%-3.07%.
[0018] The hematite-containing square engineering aggregate superconcrete comprises the following steps:
[0019] The first step is to prepare cement, fly ash, quartz sand, square engineering aggregate, natural aggregate and water according to the raw material mass ratio of 1:0.286:1.5:1.073:1.818:0.369;
[0020] The second step is to put cement, fly ash, quartz sand, square engineering aggregate and natural aggregate into a concrete vibrating mixer and dry mix for 8s-10s to make the cement, fly ash, quartz sand, square engineering aggregate and natural aggregate evenly mixed;
[0021] The third step is to add water into the concrete vibrating mixer and stir for 30s-40s until the mixture is evenly mixed.
[0022] The concrete vibrating mixer is a twin-shaft vibrating mixer.
[0023] Compared with the prior art, the present invention has the following beneficial effects:
[0024] The metamaterial concrete provided by the present invention includes square engineering aggregates with hematite as the core. When subjected to impact or explosion loads, the square engineering aggregates convert and absorb the input energy in the matrix. The soft material wrapping layer similar to a spring will enable the hematite core to oscillate repeatedly, thereby achieving the effect of suppressing impact and blast waves. The square engineering aggregates themselves can generate local resonance band gaps to achieve explosion and shock resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is the overall schematic diagram of the metamaterial concrete component; Figure 2 Schematic diagram of the internal structure of the metamaterial concrete component; Figure 3 This is a real picture of square engineering aggregate containing hematite; Figure 4 Silicone pattern for making soft coating; Figure 5 To make square engineering aggregate hematite stone diagram; Figure 6 This is a mold filled with hematite and silicone; Figure 7 This is the cross-section diagram of the prepared square engineering aggregate. DETAILED DESCRIPTION
[0026] Example 1: Performance test of square engineering aggregate superconcrete containing hematite:
[0027] A square engineering aggregate superconcrete containing hematite is composed of the following raw materials by weight: 420 kg of cement, 120 kg of fly ash, 630 kg of quartz sand, 763.6 kg of natural aggregate, 345.82 kg of engineering aggregate, 155 kg of water, and a water-cement ratio of 0.37.
[0028] The cement is P.042.5R ordinary Portland cement.
[0029] The square engineering aggregate superconcrete containing hematite is characterized in that the core density of the square engineering aggregate containing hematite is 4500kg / m 3 , soft coating density 1000kg / m 3 ; The core side length is 16mm and the soft coating thickness is 2mm.
[0030] The hematite-containing square engineering aggregate superconcrete is characterized in that the hematite-containing square engineering aggregate accounts for 24.4% of the total mass of the aggregate.
[0031] The natural aggregate particle size d2 is 5mm-16mm, continuously graded, and has a bulk density of 1520-1594kg / m 3 , the crushing index is 10.73%-12.7%, the water absorption rate is 1.70%-2.37%, and the moisture content is 0.29%-0.30%.
[0032] The particle size mass distribution of the natural aggregate is as follows: the natural aggregate particle size d2 is 5mm-10mm, and its mass fraction is 30%-40%; the natural coarse aggregate particle size d2 is 10mm-15mm, and its mass fraction is 40%-50%; the natural coarse aggregate particle size d2 is 15mm-16mm, and its mass fraction is 10%-20%.
[0033] The natural aggregate includes natural river sand, the particle size d3 of the natural aggregate is 0.35mm-0.5mm, the gradation is continuous, and the bulk density is 1426-1480kg / m 3 , water absorption rate is 4.23%-5.62%, and moisture content is 2.86%-3.07%.
[0034] The hematite-containing square engineering aggregate superconcrete comprises the following steps:
[0035] The first step is to prepare cement, fly ash, quartz sand, square engineering aggregate, natural aggregate and water according to the raw material mass ratio of 1:0.286:1.5:1.073:1.818:0.369;
[0036] The second step is to put cement, fly ash, quartz sand, square engineering aggregate and natural aggregate into a concrete vibrating mixer and dry mix for 8s-10s to make the cement, fly ash, quartz sand, square engineering aggregate and natural aggregate evenly mixed;
[0037] The third step is to add water into the concrete vibrating mixer and stir for 30s-40s until the mixture is evenly mixed.
[0038] The concrete vibrating mixer is a twin-shaft vibrating mixer.
[0039] After the fresh concrete leaves the machine, the slump of the mixture is measured using a slump cone in accordance with the provisions of GB / T50080-2002 "Standard for Test Methods for Performance of Ordinary Concrete Mixtures". The slump of the obtained square engineering aggregate super concrete containing hematite is 95mm.
[0040] Example 2: Compressive Strength Test of Square Engineering Aggregate Superconcrete Containing Hematite:
[0041] The square engineering aggregate super concrete containing hematite obtained in the embodiment of the present invention was left with a compressive strength cube test block, left to stand for 24 hours in an environment with a temperature of 20 ± 51 degrees Celsius, and finally moved to a concrete standard curing room for curing, and the age of standard curing was 28 days. After reaching the curing age, according to the prescribed method of GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", the test block was taken out for compression test, and the average compressive strength of the square engineering aggregate super concrete containing hematite was 24.94 MPa. As shown in the test results, the square engineering aggregate super concrete containing hematite prepared meets the standard requirements of concrete.
[0042] Example 3: Performance test of square engineering aggregate superconcrete containing hematite:
[0043] A square engineering aggregate superconcrete containing hematite is composed of the following raw materials by weight: 462 kg of cement, 132 kg of fly ash, 693 kg of quartz sand, 839.96 kg of natural aggregate, 380.40 kg of engineering aggregate, 170.5 kg of water, and a water-cement ratio of 0.37.
[0044] The cement is P.042.5R ordinary Portland cement.
[0045] The square engineering aggregate superconcrete containing hematite is characterized in that the core density of the square engineering aggregate containing hematite is 4500kg / m 3 , soft coating density 1000kg / m 3 ; The core side length is 16mm and the soft coating thickness is 2mm.
[0046] The hematite-containing square engineering aggregate superconcrete is characterized in that the hematite-containing square engineering aggregate accounts for 24.4% of the total mass of the aggregate.
[0047] The natural aggregate particle size d2 is 5mm-16mm, continuously graded, and has a bulk density of 1520-1594kg / m 3 , the crushing index is 10.73%-12.7%, the water absorption rate is 1.70%-2.37%, and the moisture content is 0.29%-0.30%.
[0048] The particle size mass distribution of the natural aggregate is as follows: the natural aggregate particle size d2 is 5mm-10mm, and its mass fraction is 30%-40%; the natural coarse aggregate particle size d2 is 10mm-15mm, and its mass fraction is 40%-50%; the natural coarse aggregate particle size d2 is 15mm-16mm, and its mass fraction is 10%-20%.
[0049] The natural aggregate includes natural river sand, the particle size d3 of the natural aggregate is 0.35mm-0.5mm, the gradation is continuous, and the bulk density is 1426-1480kg / m 3 , water absorption rate is 4.23%-5.62%, and moisture content is 2.86%-3.07%.
[0050] The hematite-containing square engineering aggregate superconcrete comprises the following steps:
[0051] The first step is to prepare cement, fly ash, quartz sand, square engineering aggregate, natural aggregate and water according to the raw material mass ratio of 1:0.286:1.5:1.073:1.818:0.369;
[0052] The second step is to put cement, fly ash, quartz sand, square engineering aggregate and natural aggregate into a concrete vibrating mixer and dry mix for 8s-10s to make the cement, fly ash, quartz sand, square engineering aggregate and natural aggregate evenly mixed;
[0053] The third step is to add water into the concrete vibrating mixer and stir for 30s-40s until the mixture is evenly mixed.
[0054] The concrete vibrating mixer is a twin-shaft vibrating mixer.
[0055] After the fresh concrete leaves the machine, the slump of the mixture is measured using a slump cone in accordance with the provisions of GB / T50080-2002 "Standard for Test Methods for Performance of Ordinary Concrete Mixtures". The slump of the obtained square engineering aggregate super concrete containing hematite is 95mm.
[0056] Example 4: Compressive Strength Test of Square Engineering Aggregate Superconcrete Containing Hematite:
[0057] The square engineering aggregate super concrete containing hematite obtained in the embodiment of the present invention was left with a compressive strength cube test block, left to stand for 24 hours in an environment with a temperature of 20 ± 51 degrees Celsius, and finally moved to a concrete standard curing room for curing, and the age of standard curing was 28 days. After reaching the curing age, according to the prescribed method of GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", the test block was taken out for compression test, and the average compressive strength of the square engineering aggregate super concrete containing hematite was 24.94 MPa. As shown in the test results, the square engineering aggregate super concrete containing hematite prepared meets the standard requirements of concrete.
[0058] Example 5: Performance test of square engineering aggregate superconcrete containing hematite:
[0059] A square engineering aggregate superconcrete containing hematite is composed of the following raw materials by weight: 504 kg of cement, 144 kg of fly ash, 756 kg of quartz sand, 916.32 kg of natural aggregate, 414.98 kg of engineering aggregate, 186 kg of water, and a water-cement ratio of 0.37.
[0060] The cement is P.042.5R ordinary Portland cement.
[0061] The square engineering aggregate superconcrete containing hematite is characterized in that the core density of the square engineering aggregate containing hematite is 4500kg / m 3 , soft coating density 1000kg / m 3 ; The core side length is 16mm and the soft coating thickness is 2mm.
[0062] The hematite-containing square engineering aggregate superconcrete is characterized in that the hematite-containing square engineering aggregate accounts for 24.4% of the total mass of the aggregate.
[0063] The natural aggregate particle size d2 is 5mm-16mm, continuously graded, and has a bulk density of 1520-1594kg / m 3 , the crushing index is 10.73%-12.7%, the water absorption rate is 1.70%-2.37%, and the moisture content is 0.29%-0.30%.
[0064] The particle size mass distribution of the natural aggregate is as follows: the natural aggregate particle size d2 is 5mm-10mm, and its mass fraction is 30%-40%; the natural coarse aggregate particle size d2 is 10mm-15mm, and its mass fraction is 40%-50%; the natural coarse aggregate particle size d2 is 15mm-16mm, and its mass fraction is 10%-20%.
[0065] The natural aggregate includes natural river sand, the particle size d3 of the natural aggregate is 0.35mm-0.5mm, the gradation is continuous, and the bulk density is 1426-1480kg / m 3 , water absorption rate is 4.23%-5.62%, and moisture content is 2.86%-3.07%.
[0066] The hematite-containing square engineering aggregate superconcrete comprises the following steps:
[0067] The first step is to prepare cement, fly ash, quartz sand, square engineering aggregate, natural aggregate and water according to the raw material mass ratio of 1:0.286:1.5:1.073:1.818:0.369;
[0068] The second step is to put cement, fly ash, quartz sand, square engineering aggregate and natural aggregate into a concrete vibrating mixer and dry mix for 8s-10s to make the cement, fly ash, quartz sand, square engineering aggregate and natural aggregate evenly mixed;
[0069] The third step is to add water into the concrete vibrating mixer and stir for 30s-40s until the mixture is evenly mixed.
[0070] The concrete vibrating mixer is a twin-shaft vibrating mixer.
[0071] After the fresh concrete leaves the machine, the slump of the mixture is measured using a slump cone in accordance with the provisions of GB / T50080-2002 "Standard for Test Methods for Performance of Ordinary Concrete Mixtures". The slump of the obtained square engineering aggregate super concrete containing hematite is 95mm.
[0072] Example 6: Compressive Strength Test of Square Engineering Aggregate Superconcrete Containing Hematite:
[0073] The square engineering aggregate super concrete containing hematite obtained in the embodiment of the present invention was left with a compressive strength cube test block, left to stand for 24 hours in an environment with a temperature of 20 ± 51 degrees Celsius, and finally moved to a concrete standard curing room for curing, and the age of standard curing was 28 days. After reaching the curing age, according to the prescribed method of GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", the test block was taken out for compression test, and the average compressive strength of the square engineering aggregate super concrete containing hematite was 24.94 MPa. As shown in the test results, the square engineering aggregate super concrete containing hematite prepared meets the standard requirements of concrete.
Claims
1. A hematite-containing square engineering aggregate superconcrete, characterized by: It is prepared from cement, fly ash, quartz sand, square engineering aggregate, natural aggregate and water in a mass ratio of 1:0.286:1.5:1.073:1.818:0.369, with a water-cement ratio of 0.
37.
2. The hematite-containing square engineering aggregate superconcrete according to claim 1, characterized in that: The cement is P.042.5R ordinary Portland cement, and the concrete vibrating mixer is a twin-shaft vibrating mixer.
3. The hematite-containing square engineering aggregate superconcrete according to claim 1, wherein the preparation method of the hematite-containing square engineering aggregate comprises the following steps: Step A: Mix 150g of high-quality milky white silica gel and 1.5g of AB glue and place them into a specific mold. The mass ratio of silica gel to AB glue is 100:
1. Step B: Hematite is also stuffed into the mold, with 1-2 pieces of hematite placed in each cube mold. The maximum particle size of the hematite is 10-20 mm. Step C: Smooth the surface of each cube mold. The mixed silicone and AB glue must completely cover the hematite. Let it stand for one day for the silicone to completely solidify, and you will have a square engineering aggregate containing hematite.
4. The hematite-containing square engineering aggregate superconcrete according to claim 1, characterized in that: The core density of the square engineering aggregate containing hematite ore is 4500kg / m 3 , soft coating density 1000kg / m 3 ; The core side length is 16mm and the soft coating thickness is 2mm.
5. The hematite-containing square engineering aggregate superconcrete according to claim 1, characterized in that: The volume ratio of the square engineering aggregate containing hematite is 10%, and the square engineering aggregate containing hematite accounts for 24.4% of the total mass of the aggregate.
6. The hematite-containing square engineering aggregate superconcrete according to claim 1, characterized in that: The natural aggregate particle size d2 is 5mm-16mm, continuously graded, and has a bulk density of 1520-1594kg / m 3 , the crushing index is 10.73%-12.7%, the water absorption rate is 1.70%-2.37%, and the moisture content is 0.29%-0.30%.
7. The hematite-containing square engineering aggregate superconcrete according to claim 1, characterized in that: The particle size mass distribution of the natural aggregate is as follows: the natural aggregate particle size d2 is 5mm-10mm, and its mass fraction is 30%-40%; the natural coarse aggregate particle size d2 is 10mm-15mm, and its mass fraction is 40%-50%; the natural coarse aggregate particle size d2 is 15mm-16mm, and its mass fraction is 10%-20%.
8. The hematite-containing square engineering aggregate superconcrete according to claim 1, characterized in that: The natural aggregate includes natural river sand, the particle size d3 of the natural aggregate is 0.35mm-0.5mm, the gradation is continuous, and the bulk density is 1426-1480kg / m 3 , water absorption rate is 4.23%-5.62%, and moisture content is 2.86%-3.07%.
9. The hematite-containing square engineering aggregate superconcrete according to claim 1, characterized in that: The following steps are involved: The first step is to prepare cement, fly ash, quartz sand, square engineering aggregate, natural aggregate and water according to the raw material mass ratio according to claim 1; the second step is to put the cement, fly ash, quartz sand, square engineering aggregate and natural aggregate into a concrete vibrating mixer and dry mix them for 8s-10s to uniformly mix the cement, fly ash, quartz sand, square engineering aggregate and natural aggregate; the third step is to add water into the concrete vibrating mixer and stir for 30s-40s until the mixture is uniformly mixed.