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42.5-grade delayed coagulation cement and preparation method and application thereof

A retarding and cement technology, which is applied in the field of 42.5 grade retarded cement and its preparation, can solve the problem that the setting time of cement is not long enough, and achieve the effect of increasing strength, increasing retarding time, and long setting time

Active Publication Date: 2019-04-12
山东永正水泥有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a 42.5-grade retarded cement and a preparation method thereof, aiming to provide a 42.5-grade cement and improve the problem that the existing cement setting time is not long enough

Method used

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  • 42.5-grade delayed coagulation cement and preparation method and application thereof

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[0026] A preparation method of grade 42.5 retarded cement, comprising mixing and grinding the above Portland cement clinker, granulated blast furnace slag powder, fly ash, desulfurized gypsum and retarded grinding aid. To produce 42.5 grade retarded cement. Preferably, the mixed grinding has a specific surface area of ​​340-400m 2 / kg of powder. Then it is transported to the cement silo by the hoist for storage. The pavement paved with cement in this fineness range is not prone to cracks.

[0027] When the above-mentioned 42.5 grade retarded cement is used for paving roads, it is convenient for construction, and the performance of paved roads is good.

[0028] In the present invention, the chemical composition of the selected raw materials is as follows: the components in the Portland cement clinker include by mass percentage: the components in the Portland cement clinker include: 0.38% LOSS , 21.89% SiO2 2 , 4.56%Al 2 o 3 , 3.18% Fe 2 o 3 , 66.14% CaO, 3.32% MgO, 0.5...

Embodiment 1

[0031] A 42.5 grade retarded cement, the raw materials of which include main ingredients and liquid retarded grinding aids, the main ingredients are composed of 73% Portland cement clinker, 13.5% granulated blast furnace slag powder, 5.5% Fly ash, 8% desulfurized gypsum, sodium gluconate account for 0.07% of the total mass of the main ingredients, and liquid retarding grinding aid accounts for 0.08% of the mass of the main ingredients.

[0032] A kind of preparation method of 42.5 grade retarded cement, get above-mentioned portland cement clinker 730kg, granulated blast furnace slag slag powder 135kg, fly ash 550kg, desulfurization gypsum 80kg and sodium gluconate 0.7kg, place in cement mill Grinding to obtain a specific surface area of ​​340-400m 2 / kg of powder is 42.5 grade retarded cement.

Embodiment 2

[0034] A 42.5-grade retarded cement, the raw materials of which include main ingredients and liquid retarded grinding aids, the main ingredients are composed of 81% Portland cement clinker, 9.5% granulated blast furnace slag powder, 4% Fly ash, 5.5% desulfurized gypsum, and sodium gluconate account for 0.12% of the mass of the main ingredients.

[0035]A kind of preparation method of 42.5 grade retarded cement, get above-mentioned portland cement clinker 810kg, granulated blast furnace slag slag powder 95kg, fly ash 40kg, desulfurization gypsum 55kg and sodium gluconate 1.2kg, place in cement mill inner powder Grinding to obtain a specific surface area of ​​340-400m 2 / kg of powder is 42.5 grade retarded cement.

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Abstract

The invention relates to the technical field of cement preparation, and provides 42.5-grade delayed coagulation cement, which comprises, by mass, the following raw materials: main materials: 73-81% ofsilicate cement clinker, 9.5-13.5% of granulated blast furnace slag powder, 4-6% of fly ash, 5-8% of desulfurized gypsum; and sodium gluconate: wherein sodium gluconate accounts for 0.07-0.12% of themass of the main materials. The preparation method comprises the following steps of: mixing and grinding the silicate cement clinker, the granulated blast furnace slag powder, the fly ash, the desulfurized gypsum and a delayed coagulation and grinding aid. The strength of the 42.5-grade delayed coagulation cement accords with that of the 42.5-grade delayed coagulation cement, the coagulation timeis long, and the road construction is facilitated.

Description

technical field [0001] The invention relates to the technical field of cement preparation, in particular to a 42.5 grade retarded cement and its preparation method and application. Background technique [0002] Cement, powdery hydraulic inorganic gelling material. Add water and stir to form a slurry, which can harden in the air or better harden in water, and can firmly bond sand, stone and other materials together. It can be said to be an indispensable and important material in the construction field. [0003] In road construction, due to the long time for road construction mixing, paving, and compaction, it must be completed before the cement setting time arrives. The user requires that the cement setting time need to be extended according to the site construction conditions. The coagulation time should be greater than 4h and the final coagulation time should not be less than 6h. [0004] But the setting time of the existing 42.5 grade retarded cement is still not long en...

Claims

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Application Information

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IPC IPC(8): C04B7/26
CPCC04B7/26Y02P40/10
Inventor 窦霆张青青
Owner 山东永正水泥有限公司
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