Compound coal ash for concrete

Abstract

The invention relates to compound coal ash for concrete. The compound coal ash for concrete is prepared according to the following steps: mixing basalt macadam with a grain size less than 50 millimeters and wet coal ash with a moisture content of 15 to 25 percent with hearth slag; drying the mixture; grinding the mixture into powder; and controlling the fineness being 45 microns and the residue on a square hole screen being less than 15 percent and the moisture content of the ground powder being less than 0.5 percent. The production process is simple; the cost is low; the industrial wastes, such as wet coal ash, hearth slag, and the like, are taken as raw materials; a part of cement in the concrete can be replaced by the obtained compound coal ash; the mechanical property and the durability of the concrete can be efficiently increased; the resource and energy source are saved; the industrialized production is boosted; and the environmental protection and the energy saving and emissionreduction are boosted.

Description

technical field

[0001] The invention belongs to the field of construction, and relates to a construction material, in particular to composite fly ash for concrete. Background technique

[0002] Concrete refers to using cementitious materials (such as cement), sand and stone as aggregates, mixed with water (with or without admixtures and admixtures) in a certain proportion, and obtained through stirring, molding and curing. One of the main civil engineering materials. In order to improve the workability of the concrete mixture or the performance of the hardened concrete, a finely ground mineral material-admixture is added to the concrete during mixing to replace part of the cement and reduce the amount of cement. The nature and quantity of the admixture , affecting the strength, deformation, heat of hydration, impermeability and color of concrete.

[0003] At present, concrete admixtures are mainly primary and secondary fly ash, granulated blast furnace slag powder, and ste...

Examples

Embodiment 1

[0013] The chemical compositions of basalt, wet-drained fly ash and bottom slag are shown in Table 1:

[0014] Table 1

[0015]

[0016] Take 65kg of basalt and crush it into crushed stones below 50mm, then add 10kg of furnace bottom slag to the basalt crushed stones and 25kg of wet-discharged fly ash with a moisture content of 18% in proportion, and then enter the ball mill system for grinding processing. The fineness is controlled at a 45 micron square hole sieve and the sieve residue is less than 15%. During the grinding process, the fluidized furnace is used to convey hot air to dry the incoming grinding materials. At the same time, it is necessary to ensure the normal storage and transportation of the outgoing grinding materials. The water content is less than 0.5%, and the composite fly ash for concrete is obtained.

Embodiment 2

[0018] The chemical composition of basalt, wet-discharging fly ash, and furnace bottom slag is the same as in Example 1.

[0019] Take 40kg of basalt and crush it into crushed stones below 50mm, then add 20kg of furnace bottom slag to the basalt crushed stones and 40kg of wet fly ash with a moisture content of 20% in proportion, and then enter the vertical roller mill system for grinding. The fineness of the grinding material is controlled at 45 micron square hole sieve and the sieve is less than 15%. During the grinding process, the boiling furnace is used to convey hot air to dry the grinding material. The moisture content of the ground material is less than 0.5%, and the composite fly ash for concrete is obtained.

Embodiment 3

[0021] The chemical compositions of basalt, wet-drained fly ash and bottom slag are shown in Table 2:

[0022] Table 2

[0023]

[0024] Take 40kg of basalt and crush it into crushed stones below 50mm, then add 27kg of furnace bottom slag to the basalt crushed stones and 33kg of wet fly ash with a moisture content of 22% in proportion, and then enter the vertical roller mill system for grinding. The fineness of the grinding material is controlled at 45 micron square hole sieve and the sieve is less than 15%. During the grinding process, the boiling furnace is used to convey hot air to dry the grinding material. The moisture content of the ground material is less than 0.5%, and the composite fly ash for concrete is obtained.

technical field

[0001] The invention belongs to the field of construction, and relates to a construction material, in particular to composite fly ash for concrete. Background technique

[0002] Concrete refers to using cementitious materials (such as cement), sand and stone as aggregates, mixed with water (with or without admixtures and admixtures) in a certain proportion, and obtained through stirring, molding and curing. One of the main civil engineering materials. In order to improve the workability of the concrete mixture or the performance of the hardened concrete, a finely ground mineral material-admixture is added to the concrete during mixing to replace part of the cement and reduce the amount of cement. The nature and quantity of the admixture , affecting the strength, deformation, heat of hydration, impermeability and color of concrete.

[0003] At present, concrete admixtures are mainly primary and secondary fly ash, granulated blast furnace slag powder, and ste...

Examples

Embodiment 1

[0013] The chemical compositions of basalt, wet-drained fly ash and bottom slag are shown in Table 1:

[0014] Table 1

[0015]

[0016] Take 65kg of basalt and crush it into crushed stones below 50mm, then add 10kg of furnace bottom slag to the basalt crushed stones and 25kg of wet-discharged fly ash with a moisture content of 18% in proportion, and then enter the ball mill system for grinding processing. The fineness is controlled at a 45 micron square hole sieve and the sieve residue is less than 15%. During the grinding process, the fluidized furnace is used to convey hot air to dry the incoming grinding materials. At the same time, it is necessary to ensure the normal storage and transportation of the outgoing grinding materials. The water content is less than 0.5%, and the composite fly ash for concrete is obtained.

Embodiment 2

[0018] The chemical composition of basalt, wet-discharging fly ash, and furnace bottom slag is the same as in Example 1.

[0019] Take 40kg of basalt and crush it into crushed stones below 50mm, then add 20kg of furnace bottom slag to the basalt crushed stones and 40kg of wet fly ash with a moisture content of 20% in proportion, and then enter the vertical roller mill system for grinding. The fineness of the grinding material is controlled at 45 micron square hole sieve and the sieve is less than 15%. During the grinding process, the boiling furnace is used to convey hot air to dry the grinding material. The moisture content of the ground material is less than 0.5%, and the composite fly ash for concrete is obtained.

Embodiment 3

[0021] The chemical compositions of basalt, wet-drained fly ash and bottom slag are shown in Table 2:

[0022] Table 2

[0023]

[0024] Take 40kg of basalt and crush it into crushed stones below 50mm, then add 27kg of furnace bottom slag to the basalt crushed stones and 33kg of wet fly ash with a moisture content of 22% in proportion, and then enter the vertical roller mill system for grinding. The fineness of the grinding material is controlled at 45 micron square hole sieve and the sieve is less than 15%. During the grinding process, the boiling furnace is used to convey hot air to dry the grinding material. The moisture content of the ground material is less than 0.5%, and the composite fly ash for concrete is obtained.

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