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32.5R-grade slow setting cement and preparation method thereof

A 3.35% mgo, slow-setting technology, applied in cement production, etc., can solve the problems of environmental pollution, industrial waste land occupation, etc., achieve long setting time, good workability, and reduce concrete cracking

Inactive Publication Date: 2019-03-12
山东永正水泥有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a 32.5R grade retarded cement and its preparation method, aiming to solve the problems of industrial waste occupying land and polluting the environment, and delaying the setting time of cement is beneficial to construction

Method used

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  • 32.5R-grade slow setting cement and preparation method thereof

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[0032] A preparation method of 32.5R grade retarded cement, comprising mixing and grinding the above Portland cement clinker, granulated blast furnace slag powder, fly ash, slag, desulfurized gypsum and stones. To produce 32.5R grade retarded cement. Preferably, the mixed mill powder 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.

[0033] When the above-mentioned 32.5R grade retarded cement is used for road laying, it can be convenient for construction, and the paved road has good performance.

Embodiment 1

[0036] A 32.5R grade retarded cement, the mass percentage of raw materials is composed of: 45% Portland cement clinker, 12% granulated blast furnace slag powder, 12% slag, 23% fly ash, 4% desulfurized gypsum and 4% pebbles. The components in Portland cement clinker include: 0.38% LOSS, 21.89% SiO 2 , 4.56%Al 2 o 3 , 3.18% Fe 2 o 3 , 66.14% CaO, 3.32% MgO, 0.5% SO 3 and 0.023% Cl - The balance is unavoidable impurities. Components in fly ash include: 9.8% LOSS, 39% SiO 2 , 37%Al 2 o 3 , 5.38% Fe 2 o 3 , 4.87% CaO, 0.53% MgO, 2.93% SO 3 , 0.02% Cl - The balance is unavoidable impurities. The components in desulfurized gypsum include: 2% SiO2 in terms of mass percentage 2 , 0.32%Al 2 o 3 , 0.42% Fe 2 o 3 , 31.82% CaO, 0.12% MgO, 43.2% SO 3 , 0.04% Cl - , The balance is unavoidable impurities. Granulated blast furnace slag slag powder includes: -0.67%% LOSS, 32.63% SiO 2 , 16.1%%Al 2 o 3 , 1.53% Fe 2 o 3 , 40.73% CaO, 8.43% MgO, 0.80% SO 3 , 0.026% Cl ...

Embodiment 2

[0039] A kind of 32.5R grade retarded cement, the mass percentage of its raw materials is composed of: 55% Portland cement clinker, 8% granulated blast furnace slag powder, 8% slag, 17% fly ash, 6% desulfurized gypsum and 6% pebbles. Among them, the components in Portland cement clinker include: 0.38% LOSS, 21.89% SiO 2 , 4.56%Al 2 o 3 , 3.18% Fe 2 o 3 , 66.14% CaO, 3.32% MgO, 0.5% SO 3 and 0.023% Cl - The balance is unavoidable impurities. Components in fly ash include: 9.8% LOSS, 38% SiO 2 , 38% Al 2 o 3 , 5.38% Fe 2 o 3 , 4.87% CaO, 0.53% MgO, 2.93% SO 3 , 0.02% Cl - The balance is unavoidable impurities. The components in desulfurized gypsum include: 2% SiO2 in terms of mass percentage 2 , 0.32% Al 2 o 3 , 0.42% Fe 2 o 3 , 31.82% CaO, 0.12% MgO, 43.2% SO 3 , 0.04% Cl - , The balance is unavoidable impurities. Granulated blast furnace slag slag powder includes: -0.7%% LOSS, 35% SiO 2 , 15.5%% Al 2 o 3 , 1.6% Fe 2 o 3 , 38% CaO, 9% MgO, 0.75% SO 3...

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Abstract

The invention relates to the technical field of cement preparation, and provides 32.5R-grade slow setting cement. The 32.5R-grade slow setting cement comprises raw materials in percentage by mass: 45%to 55% of portland cement clinker, 8% to 12% of granulated blast-furnace slag powder, 8% to 12% of furnace slags, 17% to 23% of fly ash, 4% to 6% of desulphurization gypsum and 4% to 6% of stones. The slow setting cement uses waste residues as the raw materials, implements resource recycling, avoids a case that the waste residues occupy the land to pollute the environment, and is high in strengthand long in setting time. The invention further provides a preparation method of the 32.5R-grade slow setting cement, which comprises: mixing each ingredient and grinding into powder. The method is simple and can prepare the 32.5R-strength-grade cement with long setting time. When the slow setting cement is laid on a road, the slow setting cement can be convenient for construction and the constructed road can have good performance.

Description

technical field [0001] The invention relates to the technical field of cement preparation, in particular to a 32.5R grade retarded cement and a preparation method thereof. Background technique [0002] At present, with the rapid development of high-grade highway traffic modernization, the development of cement concrete pavement has been placed in an important position in road construction. Due to the long time for road construction, mixing, paving, and compacting, it must be completed before the cement sets. Completed, the user needs to extend the cement setting time according to the site construction conditions. Generally, according to the construction requirements, the initial setting time of the cement should be greater than 4h and the final setting time should not be less than 6h. [0003] However, the setting time of the existing 32.5R grade cement is still not long enough, so that the cement is often solidified before the work such as road mixing, paving, and compactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/28C04B7/26
CPCC04B7/26C04B7/28Y02P40/10
Inventor 窦霆张青青
Owner 山东永正水泥有限公司
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