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Low-heat Portland cement with high early strength and preparation method and application thereof

A Portland cement, early strength technology, applied in the field of building materials, can solve problems such as restricting the application of high-speed rail projects and insufficient early strength, and achieve good resistance to chloride ion and sulfate corrosion, medium corrosion resistance. the effect of strength

Inactive Publication Date: 2019-09-06
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of its mineral composition, the existing low-heat Portland cement has insufficient early strength, which restricts its application in high-speed rail engineering

Method used

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  • Low-heat Portland cement with high early strength and preparation method and application thereof
  • Low-heat Portland cement with high early strength and preparation method and application thereof
  • Low-heat Portland cement with high early strength and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0045] The present invention also proposes a method for preparing low-heat Portland cement with high early strength, which comprises the following steps:

[0046] 1) Using low-heat Portland cement clinker as the base material, slag and silica fume as the mixed material, graphene oxide as the modifier, and mixing with gypsum to obtain the mixture;

[0047] 2) Grind the above mixture together until the specific surface area is 300m 2 / kg~350m 2 / kg, to get low-heat portland cement with high early strength.

[0048] The invention also proposes the application of a low-heat Portland cement with high early strength in high-speed rail projects.

Embodiment 1

[0052] 1) Preparation of low-heat Portland cement raw meal:

[0053] The ingredients are prepared according to the following mass parts: 70 parts of limestone, 15 parts of clay, 5 parts of shale, and 10 parts of iron powder. Mix all components evenly and grind them to 150-200 mesh to obtain low-heat Portland cement raw meal. ;

[0054] 2) Preparation of low-heat Portland cement clinker:

[0055] The prepared low-heat Portland cement raw meal is calcined in a new cement dry process kiln system to obtain low-heat Portland cement clinker; the composition of the prepared clinker is shown in Table 2;

[0056] 3) Preparation of low-heat Portland cement with high early strength:

[0057] Take 95 parts of the calcined low-heat Portland cement clinker, 0.03 parts of graphene oxide, and 5 parts of gypsum, mix them evenly, and grind them until the specific surface area is 320m 2 / kg~350m 2 / kg, made into low-heat portland cement products with high early strength.

[0058] Performanc...

Embodiment 2-6

[0060] The preparation steps are the same as in Example 1.

[0061] Among them, the batching (in parts by mass) of the low-heat Portland cement raw meal is shown in Table 1; the composition (in parts by mass) of the prepared low-heat Portland cement clinker is shown in Table 2; the early strength is high The batching (in parts by mass) of the low heat portland cement is as shown in table 3;

[0062] The properties of the low-heat portland cements with high early strength prepared in each example were tested by conventional detection methods in this field, and the results are shown in Table 4.

[0063] The batching of each embodiment low-heat Portland cement raw meal of table 1

[0064] limestone clay shale iron powder Example 1 70 15 5 10 Example 2 80 10 6 4 Example 3 80 10 6 4 Example 4 85 5 7 3 Example 5 73 13 6 8 Example 6 76 12 6 6

[0065] The composition of the low heat portland cement clinker p...

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Abstract

The invention provides a low-heat Portland cement with high early strength and a preparation method and application thereof. The cement comprises, by mass, 80-95 parts of low-heat Portland cement clinker, 0-15 parts of mineral slag, 0-15 parts of silica fume, 0.03-0.05 part of graphene oxide and 5 parts of gypsum; the low-heat Portland cement clinker comprises, by mass, 30-45 parts of C3S, 37-47 parts of C2S, 1-5 parts of C3A and 10-15 parts C4AF. Through the addition of the mineral slag and the silica fume as admixtures of the low-heat cement and through the addition of graphene oxide as a modifier, the intrusion of erosive media can be effectively suppressed and the occurrence of initial erosion damage can be delayed, so that the early strength performance of the low-heat cement is improved while low hydration heat and high crack resistance are maintained; the low-heat Portland cement has the advantages of good crack resistance, good resistance to chloride ion and sulfate erosion andthe like, and therefore is more suitable for practical use.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a low-heat Portland cement with high early strength and a preparation method and application thereof. Background technique [0002] With the deepening of my country's participation in economic globalization and regional economic integration, the development of high-speed rail has become the focus of my country's economic development. High-speed rail plays an important supporting role in the development of circular economy: it shortens the travel time of passengers and produces huge social benefits; it plays a role in promoting and balancing the economic development of areas along the line; it promotes the economic development and land development of cities along the line; the increase in the number of enterprises along the line makes National tax and local tax increase accordingly; save energy and reduce environmental pollution. [0003] As my country's ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/21C04B7/26
CPCC04B7/21C04B7/26Y02P40/10
Inventor 王敏刘云黄文高显束张坤悦王晶文寨军王显斌
Owner CHINA BUILDING MATERIALS ACAD
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