Method for preparing high-performance concrete by using slag and recycled aggregate

Abstract

The invention discloses a method for preparing high-performance concrete by using slag and recycled aggregate, which comprises the following steps: S1, collecting slag, and separating particles with the particle size of more than 5mm from the collected slag by using a drum screen; s2, the recycled aggregate is subjected to iron removal and crushing treatment; s3, metering the furnace slag, the machine-made sand, the recycled coarse aggregate, the natural coarse aggregate, the cement, the mineral powder, the fly ash, the water and the water reducing agent according to the proportion, and conveying the raw materials into a double-shaft forced stirrer for mixing and stirring to form a uniform concrete mixture; s4, a sample is taken out of the stirred concrete for sample preparation, and a compression resistance test is conducted; and S5, the concrete mixture is loaded into a concrete transportation tank car and is transported to a construction site, and pouring forming is carried out. By accurately controlling the doping proportion of the slag and the recycled aggregate, high-efficiency production of the high-performance concrete and sustainable utilization of resources are realized, and the slag and the recycled aggregate are used for replacing natural sandstone, so that the dependence on the natural sandstone is reduced.

Description

Technical Field

[0003] The invention relates to the technical field of concrete preparation, and in particular to a method for preparing high-performance concrete by utilizing slag and recycled aggregate. Background Art

[0004] At present, in the production of high-performance concrete, natural sand is mainly used as fine aggregate. The large-scale use of natural sand as raw material for concrete has caused damage to natural resources and the environment. However, with the large-scale use of concrete, natural sand resources are becoming increasingly tight, leading to a resource crisis, which is not conducive to sustainable development. The preparation cost of concrete that relies on natural sand and gravel is relatively high. In the case of tight natural sand and gravel resources, the economic burden is aggravated. Slag or recycled aggregate is used as a material to partially replace natural sand and gravel. The particle grading characteristics of slag or recycled aggregate are different from those of natural sand and gravel, which promotes the stability of concrete performance. Summary of the invention

[0005] The present invention proposes a method for preparing high performance concrete by using slag and recycled aggregate to solve the problems raised in the above background technology.

[0006] The present invention proposes a method for preparing high performance concrete using slag and recycled aggregate, comprising the following steps:

[0007] S1: Collect slag and separate particles larger than 5 mm using a drum screen;

[0008] S2: remove iron and crush the recycled aggregate;

[0009] S3: Measure slag, machine-made sand, recycled coarse aggregate, natural coarse aggregate, cement, mineral powder, fly ash, water and water reducing agent according to the proportion, and transport the raw materials into a double-shaft forced mixer for mixing and stirring to form a uniform concrete mixture. The mixing and stirring steps are as follows:

[0010] A. Transport slag, recycled coarse aggregate, machine-made sand and natural coarse aggregate into a mixer for mixing for 10-20 seconds;

[0011] B. Add cement, mineral powder and fly ash into the mixer and mix for 10-20 seconds;

[0012] C. Finally, add water and water reducing agent into the mixer and stir for 20-40 seconds to obtain a concrete mixture;

[0013] S4: Load the concrete mixture into a transport tanker and transport it to the construction site;

[0014] S5: Use a concrete pump truck to pump the concrete mixture into the construction site and cast it into shape.

[0015] Preferably, the slag screening step in S1 comprises:

[0016] 1) Send the slag into the drum screen to screen out the slag particles larger than 5 mm;

[0017] 2) The slag particles smaller than 5mm after screening are the finished slag.

[0018] Preferably, the steps of iron removal and crushing of recycled aggregate in S2 are:

[0019] 1) The construction waste is crushed and iron parts are separated by iron remover;

[0020] 2) Put the large-particle construction waste into the crusher for further crushing;

[0021] 3) Screening and separating the crushed construction waste to obtain recycled coarse aggregate.

[0022] Preferably, the weight ratio of raw materials in S3 is: 20-28 parts of slag, 50-65 parts of machine-made sand, 38-40 parts of recycled coarse aggregate, 57-60 parts of natural coarse aggregate, 18-31 parts of cement, 3-7 parts of mineral powder, 8-9 parts of fly ash, 16-19 parts of water and 0.8-1.5 parts of water reducer.

[0023] The method for preparing high performance concrete using slag and recycled aggregate proposed by the present invention has the following beneficial effects:

[0024] By precisely controlling the proportion of slag and recycled aggregate, combined with high-quality cement, mineral powder and fly ash, efficient production of high-performance concrete and sustainable utilization of resources are achieved. The use of slag and recycled aggregate to replace natural sand and gravel reduces dependence on natural sand and gravel, reduces environmental pollution, and has good ecological and environmental benefits and economic benefits. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with specific embodiments.

[0026] Example 1

[0027] The present invention proposes a method for preparing high performance concrete using slag and recycled aggregate, comprising the following steps:

[0028] S1: Collect slag, and screen the collected slag to remove slag particles larger than 5 mm;

[0029] S2: remove iron and crush the recycled aggregate;

[0030] S3: Measure the slag, machine-made sand, recycled coarse aggregate, natural coarse aggregate, cement, mineral powder, fly ash, water and water reducing agent according to the proportion, and transport them into the mixer for mixing to form a uniform concrete mixture. Mixing steps:

[0031] A. Transport slag, recycled coarse aggregate, machine-made sand and natural coarse aggregate into a mixer for mixing for 10-20 seconds;

[0032] B. Add cement, mineral powder and fly ash into the mixer and mix for 10-20 seconds;

[0033] C. Finally, add water and water reducing agent into the mixer and stir for 20-40 seconds to obtain a concrete mixture;

[0034] S4: Load the concrete mixture into a transport tanker and transport it to the construction site;

[0035] S5: Load the concrete mixture into a concrete transport tank truck, transport it to the construction site, and cast it into shape.

[0036] Slag screening process steps in S1:

[0037] 1) Send the slag into the drum screen to screen out the slag particles larger than 5 mm;

[0038] 2) The slag particles smaller than 5mm after screening are the finished slag.

[0039] Steps for iron removal and crushing of recycled aggregate in S2:

[0040] 1) The construction waste is crushed and iron parts are separated by iron remover;

[0041] 2) Put the large particles of construction waste into the crusher for further crushing;

[0042] 3) Screening and separating the crushed construction waste to obtain recycled coarse aggregate.

[0043] The weight ratio of raw materials in S3 is: 28 parts of slag, 65 parts of machine-made sand, 38 parts of recycled coarse aggregate, 57 parts of natural coarse aggregate, 18 parts of cement, 3 parts of mineral powder, 9 parts of fly ash, 18 parts of water and 0.8 parts of water reducer.

[0044] By precisely controlling the proportion of slag and recycled aggregate, combined with high-quality cement, mineral powder and fly ash, efficient production of high-performance concrete and sustainable utilization of resources are achieved;

[0045] Using slag and recycled aggregate to replace natural sand reduces dependence on natural sand and gravel, reduces environmental pollution, and has good ecological and environmental benefits and economic benefits;

[0046] Through precise proportioning and optimized production process, the compressive strength and durability of high-performance concrete are improved, meeting higher requirements for engineering applications, reducing the mining and use of natural sand and gravel, reducing damage to the natural environment, and promoting sustainable development;

[0047] By stirring, slag and recycled aggregate can be evenly dispersed in the concrete, improving the uniformity and stability of the concrete.

[0048] Example 2

[0049] The present invention proposes a method for preparing high performance concrete using slag and recycled aggregate, comprising the following steps:

[0050] S1: Collect slag, and screen the collected slag to remove slag particles larger than 5 mm;

[0051] S2: remove iron and crush the recycled aggregate;

[0052] S3: slag, machine-made sand, recycled coarse aggregate, natural coarse aggregate, cement, mineral powder, fly ash, water and water reducing agent are measured according to the proportion, and the raw materials are transported into the mixer for mixing and stirring to form a uniform concrete mixture; mixing and stirring steps:

[0053] A. Add slag, recycled coarse aggregate, machine-made sand and natural coarse aggregate into a mixer and mix them for 10-20 seconds;

[0054] B. Add cement, mineral powder and fly ash into the mixer and mix for 10-20 seconds;

[0055] C. Finally, add water and water reducing agent into the mixer and stir for 20-40 seconds to obtain a concrete mixture;

[0056] S4: Take samples from the mixed concrete for sample preparation and perform compression tests to ensure that the concrete meets the design requirements;

[0057] S5: Load the concrete mixture into a concrete transport tank truck, transport it to the construction site, and cast it into shape.

[0058] Slag screening process steps in S1:

[0059] 1) Send the slag into the drum screen to screen out the slag particles larger than 5 mm;

[0060] 2) The slag particles smaller than 5mm after screening are the finished slag.

[0061] Steps for iron removal and crushing of recycled aggregate in S2:

[0062] 1) The construction waste is crushed and iron parts are separated by iron remover;

[0063] 2) Put the large particles of construction waste into the crusher for further crushing;

[0064] 3) Screening and separating the crushed construction waste to obtain recycled coarse aggregate.

[0065] The weight ratio of raw materials in S3 is: 27 parts of slag, 61 parts of machine-made sand, 39 parts of recycled coarse aggregate, 58 parts of natural coarse aggregate, 20 parts of cement, 4 parts of mineral powder, 9 parts of fly ash, 18 parts of water and 0.85 parts of water reducer.

[0066] Example 3

[0067] The present invention proposes a method for preparing high performance concrete using slag and recycled aggregate, comprising the following steps:

[0068] S1: Collect slag, and screen the collected slag to remove slag particles larger than 5 mm;

[0069] S2: remove iron and crush the recycled aggregate;

[0070] S3: slag, machine-made sand, recycled coarse aggregate, natural coarse aggregate, cement, mineral powder, fly ash, water and water reducing agent are measured according to the proportion, and the raw materials are transported into the mixer for mixing and stirring to form a uniform concrete mixture; mixing and stirring steps:

[0071] A. Pour slag, recycled coarse aggregate, machine-made sand and natural coarse aggregate into a mixer and mix them for 10-20 seconds;

[0072] B. Add cement, mineral powder and fly ash into the mixer and mix for 10-20 seconds;

[0073] C. Finally, add water and water reducing agent into the mixer and stir for 20-40 seconds to obtain a concrete mixture;

[0074] S4: Take samples from the mixed concrete for sample preparation and perform compression tests to ensure that the concrete meets the design requirements;

[0075] S5: Load the concrete mixture into a concrete transport tank truck, transport it to the construction site, and cast it into shape.

[0076] Slag screening process steps in S1:

[0077] 1) Send the slag into the drum screen to screen out the slag particles larger than 5 mm;

[0078] 2) The slag particles smaller than 5mm after screening are the finished slag.

[0079] Steps for iron removal and crushing of recycled aggregate in S2:

[0080] 1) The construction waste is crushed and iron parts are separated by iron remover;

[0081] 2) Put the large particles of construction waste into the crusher for further crushing;

[0082] 3) Screening and separating the crushed construction waste to obtain recycled coarse aggregate.

[0083] The weight ratio of raw materials in S3 is: 25 parts of slag, 58 parts of machine-made sand, 39 parts of recycled coarse aggregate, 59 parts of natural coarse aggregate, 24 parts of cement, 5 parts of mineral powder, 9 parts of fly ash, 17.7 parts of water and 0.9 parts of water reducer.

[0084] Example 4

[0085] The present invention proposes a method for preparing high performance concrete using slag and recycled aggregate, comprising the following steps:

[0086] S1: Collect slag, and screen the collected slag to remove slag particles larger than 5 mm;

[0087] S2: remove iron and crush the recycled aggregate;

[0088] S3: Measure slag, machine-made sand, recycled coarse aggregate, natural coarse aggregate, cement, mineral powder, fly ash, water and water reducing agent according to the proportion, pour the raw materials into a mixer for mixing and stirring to form a uniform concrete mixture; mixing and stirring steps:

[0089] A. Pour slag, recycled coarse aggregate, machine-made sand and natural coarse aggregate into a mixer and mix them for 10-20 seconds;

[0090] B. Add cement, mineral powder and fly ash into the mixer and mix for 10-20 seconds;

[0091] C. Finally, add water and water reducing agent into the mixer and stir for 20-40 seconds to obtain a concrete mixture;

[0092] S4: Take samples from the mixed concrete for sample preparation and perform compression tests to ensure that the concrete meets the design requirements;

[0093] S5: Load the concrete mixture into a concrete transport tank truck, transport it to the construction site, and cast it into shape.

[0094] Slag screening process steps in S1:

[0095] 1) Send the slag into the drum screen to screen out the slag particles larger than 5 mm;

[0096] 2) The slag particles smaller than 5mm after screening are the finished slag.

[0097] Steps for iron removal and crushing of recycled aggregate in S2:

[0098] 1) The construction waste is crushed and iron parts are separated by iron remover;

[0099] 2) Put the large particles of construction waste into the crusher for further crushing;

[0100] 3) Screening the crushed construction waste to obtain recycled coarse aggregate.

[0101] The weight ratio of raw materials in S3 is: 24 parts of slag, 56 parts of machine-made sand, 39 parts of recycled coarse aggregate, 59 parts of natural coarse aggregate, 25 parts of cement, 7 parts of mineral powder, 9 parts of fly ash, 17.2 parts of water and 1 part of water reducer.

[0102] Example 5

[0103] The present invention proposes a method for preparing high performance concrete using slag and recycled aggregate, comprising the following steps:

[0104] S1: Collect slag, and screen the collected slag to remove slag particles larger than 5 mm;

[0105] S2: remove iron and crush the recycled aggregate;

[0106] S3: Measure the slag, machine-made sand, recycled coarse aggregate, natural coarse aggregate, cement, mineral powder, fly ash, water and water reducing agent according to the proportion, pour the raw materials into the mixer and mix them to form a uniform concrete mixture. Mixing steps:

[0107] A. Pour slag, recycled coarse aggregate, machine-made sand and natural coarse aggregate into a mixer and mix them for 10-20 seconds;

[0108] B. Add cement, mineral powder and fly ash into the mixer and mix for 10-20 seconds;

[0109] C. Finally, add water and water reducing agent into the mixer and stir for 20-40 minutes to obtain a concrete mixture;

[0110] S4: Take samples from the mixed concrete for sample preparation and perform compression tests to ensure that the concrete meets the design requirements;

[0111] S5: Load the concrete mixture into a concrete transport tank truck, transport it to the construction site, and cast it into shape.

[0112] Slag screening process steps in S1:

[0113] 1) Send the slag into the drum screen to screen out the slag particles larger than 5 mm;

[0114] 2)) The slag particles smaller than 5mm after screening are the finished slag.

[0115] Steps for iron removal and crushing of recycled aggregate in S2:

[0116] 1) The construction waste is crushed and iron parts are separated by iron remover;

[0117] 2) Put the large particles of construction waste into the crusher for further crushing;

[0118] 3) Screening and separating the crushed construction waste to obtain recycled coarse aggregate.

[0119] The weight ratio of raw materials in S3 is: 23 parts of slag, 53 parts of machine-made sand, 40 parts of recycled coarse aggregate, 60 parts of natural coarse aggregate, 27 parts of cement, 7 parts of mineral powder, 9 parts of fly ash, 17 parts of water and 1.3 parts of water reducer.

[0120] The concrete prepared according to Examples 1 to 5 was subjected to performance tests, and the results are shown in the following table:

[0121]

[0122] As shown in the table, the concrete prepared in Examples 1 to 5 has good quality and good compressive performance.

[0123] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing high performance concrete using slag and recycled aggregate, characterized in that: The steps include: S1: Collect slag and separate particles larger than 5 mm using a drum screen; S2: Remove iron and crush construction waste; S3: Measure slag, machine-made sand, recycled coarse aggregate, natural coarse aggregate, cement, mineral powder, fly ash, water and water reducing agent according to the proportion, and transport the raw materials into a double-shaft forced mixer for mixing and stirring to form a uniform concrete mixture. The mixing and stirring steps are as follows: A. Pour slag, recycled coarse aggregate, machine-made sand and natural coarse aggregate into a mixer and mix them for 10-20 seconds; B. Add cement, mineral powder and fly ash into the mixer and mix for 10-20 seconds; C. Finally, add water and water reducing agent into the mixer and stir for 20-40 seconds to obtain a concrete mixture; S4: Take samples from the mixed concrete for sample preparation and conduct compression and other index tests to ensure that the concrete quality meets the design requirements. S5: Load the concrete mixture into a concrete transport tank truck, transport it to the construction site, and cast it into shape.

2. The method for preparing high performance concrete using slag and recycled aggregate according to claim 1, characterized in that: The slag screening process in S1: 1) Send the slag into the drum screen to screen out the slag particles larger than 5mm. 2) The slag particles smaller than 5mm after screening are the finished slag.

3. The method for preparing high performance concrete using slag and recycled aggregate according to claim 1, characterized in that: The steps of iron removal and crushing of recycled aggregate in S2: 1) The construction waste is roughly crushed, and then the iron parts are separated by the iron remover; 2) Put the large-particle construction waste into the crusher for further crushing; 3) Screening and separating the crushed construction waste to obtain finished recycled coarse aggregate.

4. The method for preparing high performance concrete using slag and recycled aggregate according to claim 1, characterized in that: The weight ratio of raw materials in S3 is: 20-28 parts of slag, 50-65 parts of machine-made sand, 38-40 parts of recycled coarse aggregate, 57-60 parts of natural coarse aggregate, 18-31 parts of cement, 3-7 parts of mineral powder, 8-9 parts of fly ash, 16-19 parts of water and 0.8-1.5 parts of water reducer.

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