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A kind of hydraulic cement clinker and its preparation method, hydraulic cement and its application

A cement clinker and hydraulic technology, which is applied in the field of hydraulic cement and its application, hydraulic cement clinker and its preparation, can solve the problems that affect the normal use of marine engineering, slow strength development, long maintenance time, etc., and achieve long-term The effect of stable strength development, high early strength and slow hydration rate

Active Publication Date: 2020-09-04
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary Portland cement or concrete repair materials have a long maintenance time and slow strength development. Ocean engineering structures such as port facilities need to be restored to use as soon as possible after damage. Using traditional concrete for repair will affect the normal use of ocean engineering and will be affected by sulfuric acid. salt corrosion

Method used

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  • A kind of hydraulic cement clinker and its preparation method, hydraulic cement and its application
  • A kind of hydraulic cement clinker and its preparation method, hydraulic cement and its application
  • A kind of hydraulic cement clinker and its preparation method, hydraulic cement and its application

Examples

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preparation example Construction

[0033] The present invention provides the preparation method of hydraulic cement clinker described in above-mentioned technical scheme, comprises the following steps:

[0034] Calcium oxide, phosphorus pentoxide and aluminum oxide are mixed to obtain a mixture; in terms of weight percentage, the mixture includes 30% to 60% of calcium oxide, 10% to 35% of phosphorus pentoxide and aluminum oxide Aluminum 30%~60%;

[0035] The mixture is calcined to obtain hydraulic cement clinker.

[0036]The present invention mixes calcium oxide, phosphorus pentoxide and aluminum oxide to obtain a mixture. In the present invention, the mixture includes 30%-60% of calcium oxide, 10%-35% of phosphorus pentoxide and 30%-60% of aluminum oxide by weight percentage. The present invention adopts the mixture with the above percentage content in order to obtain the hydraulic cement clinker with the above mineral composition. The present invention has no special requirements on the mixing method, and ...

Embodiment 1

[0050] According to the raw material ratio in Table 1, weigh calcium nitrate tetrahydrate, aluminum nitrate nonahydrate and phosphoric acid respectively, add them into deionized water to form a mixed solution, heat the mixed solution to 85°C, and keep stirring until the water evaporates to form a gel;

[0051] The gel was placed in a corundum crucible, heated to 850°C in a resistance furnace, kept for 3 hours, cooled to room temperature naturally, pulverized with a pulverizer, and passed through a 200-mesh molecular sieve to obtain calcium oxide, phosphorus pentoxide and three Precursor composed of alumina;

[0052] Use a mold to press the precursor into a cylindrical blank with a thickness of 10mm and a diameter of 40mm under a pressure of 100MPa;

[0053] Place the cylindrical billet in a resistance furnace, raise the furnace temperature from room temperature to 1537°C at a heating rate of 16°C / min, keep it warm for 2 hours, quickly take out the calcined cylindrical billet, ...

Embodiment 2～5

[0055] The hydraulic cement clinker was prepared according to the method of Example 1, and the raw materials used and the calcination temperature are shown in Table 1.

[0056] Raw material ratio and calcination temperature value in table 1 embodiment 1~5

[0057]

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Abstract

The invention provides hydraulic cement clinker, which is prepared from the following mineral components by weight percent: 30-95% of calcium aluminophosphate, 1-50% of calcium aluminate, 1-50% of calcium phosphate and 0.1-10% of vitreous body, wherein the molecular formula of calcium aluminophosphate is Ca8Al12P2O31. The compressive strength of the hydraulic cement clinker provided by the invention reaches 60.1-86.7MPa in one day, reaches 66.9-103.9MPa in three days, reaches 82.1-115.4MPa in 28 days, and reaches 96.9-133.8MPa in 90 days, so that the hydraulic cement clinker has the characteristics of being high in early strength and stable in long-term strength development. The invention also provides hydraulic cement; the hydraulic cement also has the characteristics of being high in early strength and stable in long-term strength development, thus being suitable for load bearing, reinforcing and protecting of ocean engineering.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a hydraulic cement clinker and a preparation method thereof, a hydraulic cement and an application thereof. Background technique [0002] Seawater corrosion-resistant cement is needed to develop the marine economy for the construction of marine engineering and coastal energy infrastructure, as well as the reinforcement and protection of damaged marine engineering. [0003] In the marine environment, the chloride ion in seawater has a small radius, strong electronegativity, and high diffusion and penetration capabilities. It is easy to invade into reinforced concrete and reach the surface of the steel bar. When it accumulates to a certain concentration, it will destroy the passivation of the steel bar surface. On the one hand, the corrosion products expand and generate stress at the concrete-steel interface, resulting in concrete cracking and damage; on the other hand, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B12/02C04B7/44
CPCC04B7/44C04B12/025
Inventor 丁铸王晓东张宁刘飚徐沐睿田炳瑶洪鑫李玉玉李定发
Owner SHENZHEN UNIV
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