Lightweight aggregate concrete prepared from circulating fluidized bed slag and method

Abstract

The invention discloses lightweight aggregate concrete prepared from circulating fluidized bed slag. The lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 18-20 parts of cement, 10-12 parts of fly ash, 100-110 parts of circulating fluidized bed slag, 0.5-0.6 part of a pumping agent, 0.9-1 part of an air entraining agent and 28-30 parts of mixing water. The invention also provides a preparation method for preparing the lightweight aggregate concrete by using the circulating fluidized bed slag. The circulating fluidized bed slag is used for replacing lightweight aggregate, the circulating fluidized bed slag has the advantages of light weight, durability and environmental protection, so that the formed concrete is good in working performance, excellent in mechanical property, up-to-standard in compressive strength and excellent in durability, and the circulating fluidized bed slag is used as a concrete raw material, so that dual benefits of environment and economy are realized; the environmental pressure is relieved and the solid waste treatment cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, and in particular to a method for preparing lightweight aggregate concrete by utilizing circulating fluidized bed slag. Background Art

[0002] Concrete is the most important building material in civil engineering today, and it is also the most widely used and largest-volume building material. It can not only be widely used in industrial and civil construction, hydraulic construction and urban construction, but also in various buildings for marine development. It can also be made into sleepers, electric poles, pressure pipes, underground projects, etc.

[0003] Concrete made of light aggregate, cementitious materials and water is called light aggregate concrete. Its apparent density is not more than 1900kg / m3. The so-called light aggregate is an aggregate used to reduce the mass of concrete and improve the thermal effect. Its apparent density is lower than that of ordinary aggregate. Light aggregate concrete has the characteristics of light weight, high strength, heat preservation and fire resistance, and has good deformation performance, low elastic modulus, and generally large shrinkage and creep. However, there is a shortage of light aggregate raw materials, and the circulating fluidized bed combustion technology produces a large amount of ash with complex composition and difficult to directly use, which poses a potential threat to the environment. Summary of the invention

[0004] The present invention proposes a method for preparing lightweight aggregate concrete using circulating fluidized bed slag to solve the problems raised in the above background technology.

[0005] The present invention proposes a method for preparing lightweight aggregate concrete using circulating fluidized bed slag, wherein the weight ratio is as follows:

[0006] 18-20 parts of cement, 10-12 parts of fly ash, 100-110 parts of circulating fluidized bed slag, 0.5-0.6 parts of pumping agent, 0.9-1 parts of air entraining agent, and 28-30 parts of mixing water.

[0007] Preferably, the circulating fluidized bed slag particles are composed of quartz, anhydrite, chromite, mica and vitreous, and the size of the circulating fluidized bed slag particles is less than 5 mm.

[0008] Preferably, the air entraining agent is -III High efficiency air entraining agent for concrete.

[0009] Preferably, the water reducer is a PCA.Ⅰ type high performance retarding water reducer.

[0010] The present invention also proposes a method for preparing lightweight aggregate concrete using circulating fluidized bed slag, comprising the following steps:

[0011] S1: collecting and optimizing circulating fluidized bed slag;

[0012] The circulating fluidized bed slag particles are introduced into a screening device to screen out large particles of the circulating fluidized bed slag particles;

[0013] S2: Circulating fluidized bed slag, cement, fly ash, air entraining agent, water and water reducing agent are measured according to the following proportions:

[0014] 18-20 parts of cement, 10-12 parts of fly ash, 100-110 parts of circulating fluidized bed slag, 0.5-0.6 parts of pumping agent, 0.9-1 parts of air entraining agent, and 28-30 parts of mixing water.

[0015] The cement is P.O42.5 ordinary Portland cement, and the fly ash is Class F I fly ash. The addition of cement and fly ash can ensure the strength and durability of concrete. The circulating fluidized bed slag has the advantages of light bulk density and good thermal insulation.

[0016] The addition of pumping agent and air entraining agent can effectively reduce the water-cement ratio and bulk density of concrete, thereby improving the fluidity and pumpability of concrete, making it less likely for pipes to be blocked during concrete pumping, thereby improving the efficiency of concrete pumping and construction efficiency.

[0017] The raw materials are transported into a double-shaft forced mixer for mixing and stirring to form a uniform concrete mixture;

[0018] S3: Take samples from the mixed concrete for sample preparation, and conduct compression test and dry density test to ensure that the concrete quality meets the design requirements;

[0019] S4: Load the concrete mixture into the concrete transport tank truck, transport it to the construction site, and carry out pouring, molding and curing.

[0020] The invention proposes a method for preparing lightweight aggregate concrete using circulating fluidized bed slag, which has the following beneficial effects:

[0021] By replacing lightweight aggregate with circulating fluidized bed slag, which has the advantages of light weight, durability and environmental protection, the formed concrete has good working performance, excellent mechanical properties, compressive strength that meets the standards, excellent durability, and significantly improved resistance to freeze-thaw cycles. Using circulating fluidized bed slag as a concrete raw material can achieve dual environmental and economic benefits, reduce environmental pressure, and save processing costs. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with specific embodiments.

[0023] Example 1: The present invention proposes a method for preparing lightweight aggregate concrete using circulating fluidized bed slag, wherein the weight ratio is as follows:

[0024] 18 parts of cement, 10 parts of fly ash, 100 parts of circulating fluidized bed slag, 0.5 parts of pumping agent, 0.9 parts of air entraining agent, and 28 parts of mixing water.

[0025] The circulating fluidized bed slag particles are composed of quartz, anhydrite, chromite, mica and vitreous body, and the size of the circulating fluidized bed slag particles is less than 5mm.

[0026] Air entraining agent -III High efficiency air entraining agent for concrete.

[0027] The water reducer is PCA.Ⅰ type high performance slow setting water reducer.

[0028] By replacing lightweight aggregate with circulating fluidized bed slag, which has the advantages of light weight, durability and environmental protection, the formed concrete has good working performance, excellent mechanical properties, compressive strength that meets the standards, excellent durability, and significantly improved resistance to freeze-thaw cycles. Using circulating fluidized bed slag as a concrete raw material can achieve dual environmental and economic benefits, reduce environmental pressure, and save processing costs.

[0029] The present invention also proposes a method for preparing lightweight aggregate concrete using circulating fluidized bed slag, comprising the following steps:

[0030] S1: collecting and optimizing circulating fluidized bed slag;

[0031] The circulating fluidized bed slag particles are introduced into a screening device to screen out large particles of the circulating fluidized bed slag particles;

[0032] S2: Circulating fluidized bed slag, cement, fly ash, air entraining agent, water and water reducing agent are measured according to the following proportions:

[0033] 18 parts of cement, 10 parts of fly ash, 100 parts of circulating fluidized bed slag, 0.5 parts of pumping agent, 0.9 parts of air entraining agent, 28 parts of mixing water;

[0034] The cement is P.O42.5 ordinary Portland cement, and the fly ash is Class F I fly ash. The addition of cement and fly ash can ensure the strength and durability of concrete. The circulating fluidized bed slag has the advantages of light bulk density and good thermal insulation. In addition, it also has certain strength.

[0035] The addition of pumping agent and air entraining agent can effectively reduce the water-cement ratio and bulk density of concrete, thereby improving the fluidity and pumpability of concrete, making it less likely for pipes to be blocked during concrete pumping, thereby improving the efficiency of concrete pumping and construction efficiency.

[0036] The raw materials are transported into a double-shaft forced mixer for mixing and stirring to form a uniform concrete mixture;

[0037] S3: Take samples from the mixed concrete for sample preparation, and conduct compression test and dry density test to ensure that the concrete quality meets the design requirements;

[0038] S4: Load the concrete mixture into the concrete transport tank truck, transport it to the construction site, and carry out pouring, molding and curing.

[0039] Example 2: The present invention proposes a method for preparing lightweight aggregate concrete using circulating fluidized bed slag, wherein the weight ratio is as follows:

[0040] 20 parts of cement, 12 parts of fly ash, 110 parts of circulating fluidized bed slag, 0.6 parts of pumping agent, 1 part of air entraining agent, and 30 parts of mixing water.

[0041] The circulating fluidized bed slag particles are composed of quartz, anhydrite, chromite and glass, and the size of the circulating fluidized bed slag particles is less than 5 mm.

[0042] Air entraining agent -III High efficiency air entraining agent for concrete.

[0043] The water reducer is PCA.Ⅰ type high performance slow setting water reducer.

[0044] The present invention also proposes a method for preparing lightweight aggregate concrete using circulating fluidized bed slag, comprising the following steps:

[0045] S1: collecting and optimizing circulating fluidized bed slag;

[0046] The circulating fluidized bed slag particles are introduced into a screening device to screen out large particles of the circulating fluidized bed slag particles;

[0047] S2: Circulating fluidized bed slag, cement, fly ash, air entraining agent, water and water reducing agent are measured according to the following proportions:

[0048] 20 parts of cement, 12 parts of fly ash, 110 parts of circulating fluidized bed slag, 0.6 parts of pumping agent, 1 part of air entraining agent, 30 parts of mixing water;

[0049] The cement is P.O42.5 ordinary Portland cement, and the fly ash is Class F I fly ash. The addition of cement and fly ash can ensure the strength and durability of concrete. The circulating fluidized bed slag has the advantages of light bulk density and good thermal insulation. In addition, it also has certain strength.

[0050] The addition of pumping agent and air entraining agent can effectively reduce the water-cement ratio and bulk density of concrete, thereby improving the fluidity and pumpability of concrete, making it less likely for pipes to be blocked during concrete pumping, thereby improving the efficiency of concrete pumping and construction efficiency.

[0051] The raw materials are transported into a double-shaft forced mixer for mixing and stirring to form a uniform concrete mixture;

[0052] S3: Take samples from the mixed concrete for sample preparation, and conduct compression test and dry density test to ensure that the quality of the concrete meets the design requirements;

[0053] S4: Load the concrete mixture into the concrete transport tank truck, transport it to the construction site, and carry out pouring, molding and curing.

[0054] The concrete prepared according to Examples 1 and 2 was tested for performance, and the results are shown in the following table:

[0055]

[0056] 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 lightweight aggregate concrete using circulating fluidized bed slag, characterized in that: The raw materials are formulated as follows according to weight parts: 18-20 parts of cement, 10-12 parts of fly ash, 100-110 parts of circulating fluidized bed slag, 0.5-0.6 parts of pumping agent, 0.9-1 parts of air entraining agent, and 28-30 parts of mixing water.

2. The method for preparing lightweight aggregate concrete using circulating fluidized bed slag according to claim 1, characterized in that: The circulating fluidized bed slag particles are composed of quartz, anhydrite, chromite, mica and vitreous body, and the size of the circulating fluidized bed slag particles is less than 5 mm.

3. The method for preparing lightweight aggregate concrete using circulating fluidized bed slag according to claim 1, characterized in that: The air entraining agent is Highly efficient air entraining agent for concrete.

4. The method for preparing lightweight aggregate concrete using circulating fluidized bed slag according to claim 1, characterized in that: The water reducer is a PCA.Ⅰ type high performance slow setting water reducer.

5. A method for preparing lightweight aggregate concrete using circulating fluidized bed slag according to any one of claims 1 to 4, characterized in that: The steps include: S1: collecting and optimizing circulating fluidized bed slag; The circulating fluidized bed slag particles are introduced into a screening device to screen out large particles of the circulating fluidized bed slag particles; S2: Circulating fluidized bed slag, cement, fly ash, air entraining agent, water and water reducing agent are measured according to the following proportions: 18-20 parts of cement, 10-12 parts of fly ash, 100-110 parts of circulating fluidized bed slag, 0.5-0.6 parts of pumping agent, 0.9-1 parts of air entraining agent, 28-30 parts of mixing water; The cement is P.O42.5 ordinary Portland cement, and the fly ash is Class F I fly ash. The addition of cement and fly ash can ensure the strength and durability of concrete. The circulating fluidized bed slag has the advantages of light bulk density and good thermal insulation. The addition of pumping agent and air entraining agent can effectively reduce the water-cement ratio and bulk density of concrete, thereby improving the fluidity and pumpability of concrete, making it less likely for pipes to be blocked during concrete pumping, thereby improving the efficiency of concrete pumping and construction efficiency. The raw materials are transported into a double-shaft forced mixer for mixing and stirring to form a uniform concrete mixture; S3: Take samples from the mixed concrete for sample preparation, and conduct compression test and dry density test to ensure that the concrete quality meets the design requirements; S4: Load the concrete mixture into the concrete transport tank truck, transport it to the construction site, and carry out pouring, molding and curing.

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