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Retarded portland cement and preparation method thereof

A technology of Portland cement and retarded silicate, applied in the field of building materials, can solve the problems of poor corrosion resistance and heat resistance of cement materials, collapse damage, use restrictions, etc., achieve convenient operation, reduce hydration heat, etc. , the effect of reducing the loss rate of flexural and compressive strength

Active Publication Date: 2020-01-17
四川省宁南县白鹤滩水泥有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the material composition and internal pore structure of the cement itself, the corrosion resistance and heat resistance of the cement material are poor. The use of engineering and other aspects of thermal requirements is obviously restricted, and accidents that are likely to cause premature failure and collapse damage occur from time to time, and cause huge losses

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  • Retarded portland cement and preparation method thereof
  • Retarded portland cement and preparation method thereof
  • Retarded portland cement and preparation method thereof

Examples

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preparation example Construction

[0033] A preparation method of Portland cement clinker, comprising: combining at least one calcareous raw material, at least one clay raw material and at least one iron raw material, and grinding to prepare raw meal; combining the above raw meal and at least one mineral raw material The cement clinker is obtained by sintering at high temperature, and after cooling, the cement clinker is obtained by secondary grinding; the flexural and compressive strength loss rate of the cement clinker in the continuous 360d soaking environment is less than 5%. The preparation method can improve the scorchability of the raw meal in a high temperature environment, sinter to form a clinker with a polycrystalline configuration, and the clinker has continuous strength development, low late strength loss rate, good corrosion resistance and good wear resistance. and other significant advantages, improving the compressive performance of Portland cement.

[0034] In a preferred embodiment, the calcar...

Embodiment 1

[0051] A preparation method of Portland cement clinker, comprising the following specific steps:

[0052] (1) Mix 66 parts of limestone (chemical composition as shown in Table 1), 15 parts of quartz sandstone (chemical composition as shown in Table 2) and 11 parts of iron ore (chemical composition as shown in Table 3), and grind to a fineness of 0.08mm. Less than 5%, raw meal is prepared;

[0053] (2) Take the above-mentioned raw meal and the mineralizer that accounts for 0.075% of the raw meal weight, sinter at a high temperature of 1450° C. for 90 minutes, and after rapid cooling, secondary grinding to a fineness of 0.15 mm and a sieve residue of less than 5% to obtain silicate In the cement clinker, the above-mentioned mineralizer is expanded vermiculite and barium titanate, and its weight ratio is 1:0.75.

[0054] Table 2 Chemical composition of quartz sandstone (wt%)

[0055] Element silica Alumina Iron oxide Calcium Oxide Magnesium oxide Potassium...

Embodiment 2

[0061] A preparation method of retarded Portland cement, comprising the following specific steps:

[0062] (1) Mix 76 parts of limestone (chemical composition as shown in Table 1), 18 parts of quartz sandstone (chemical composition as shown in Table 2) and 13 parts of iron ore (chemical composition as shown in Table 3), and grind to a fineness of 0.08mm. Less than 5%, raw meal is prepared;

[0063] (2) Take the above-mentioned raw meal and the mineralizer that accounts for 0.06% of the weight of the raw meal, sinter at a high temperature of 1450° C. for 75 minutes, and after rapid cooling, regrind to a fineness of 0.15 mm and the sieve residue is less than 5% to obtain silicate Cement clinker, above-mentioned mineralizer is expanded vermiculite and barium titanate, and its weight ratio is 1:0.8;

[0064] (3) Mix 68% of the above-mentioned cement clinker, 21% of nano-silica aerogel, and 11% of gypsum by weight percentage, and grind to a fineness of 0.08mm and a sieve residue o...

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Abstract

The invention provides a retarded portland cement preparation method, and belongs to the field of building materials. The preparation method comprises: combining a calcareous raw material, a clayey raw material and an iron raw material, and grinding to prepare a raw material; combining the raw material and a mineralizer, sintering at a high temperature, cooling, and carrying out secondary grindingto obtain a cement clinker; and combining the cement clinker, a cementing material and gypsum, and grinding to obtain the retarded portland cement. According to the invention, with the preparation method, the hydration induction period time of the cement can be prolonged, the hydration heat can be reduced, the temperature peak occurrence time can be delayed, the chloride ions can be solidified, the chloride ion diffusion coefficient can be reduced, the chloride ion erosion resistance and the durability of the cement are improved, the strength of the obtained cement at the age of 28 days exceeds 65 MPa, and the corrosion resistance and the heat resistance are excellent; and the obtained cement clinker can continuously provide strength development, the loss rate of the flexural strength andthe compressive strength in a continuous soaking environment is lower than 5%, the volume shrinkage rate of cement is reduced, the erosion depth of sulfate ions is low, and the corrosion resistance of the cement is improved.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a retarded Portland cement and a preparation method thereof. Background technique [0002] Cement and concrete are the most widely used building materials and there is a continuous demand for them in the construction of houses, bridges, etc. in the context of an increasing population, and the huge usage constitutes 8-10% of the total carbon emissions in the world. Cement is a binder that cures and hardens to hold other materials together. The most important cement is used as a combination of mortar and aggregate to form concrete, a strong building material. Practical production requires concrete to have significant advantages, namely 1) strength development that accelerates or decelerates growth at various curing temperatures based on demand; 2) enhanced overall mechanical strength (high load capacity); 3) higher lifespan - No corrosive side reactions. [0003] Ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/02C04B7/22C04B7/36C04B7/44C04B7/43C04B7/04
CPCC04B7/02C04B7/04C04B7/22C04B7/36C04B7/425C04B7/427C04B7/44
Inventor 孙小培周正明
Owner 四川省宁南县白鹤滩水泥有限责任公司