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High-alkalinity and high-strength sulphoaluminate cement

A technology of sulfoaluminate cement and sulfoaluminate clinker, applied in cement production and other directions, can solve the problems of steel corrosion, low alkalinity, slow hydration speed, etc. The effect of service life

Active Publication Date: 2019-04-02
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is well known that C 2 The hydration rate of S is slow, and it is difficult to provide more hydroxides for the system in the early stage of service, which will lead to low alkalinity of the sulfoaluminate cement reinforced concrete system, insufficient protection for steel bars, and prone to steel bar corrosion problems

Method used

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  • High-alkalinity and high-strength sulphoaluminate cement
  • High-alkalinity and high-strength sulphoaluminate cement
  • High-alkalinity and high-strength sulphoaluminate cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1- Embodiment 3 and comparative example 1- comparative example 3

[0061] Prepare the sample of sulphoaluminate clinker according to the formula listed in Table 1 below, and measure the alkalinity of the sulphoaluminate clinker hydration system according to GB20472-2006. The test results are shown in Table 1, and the ratio in the table For weight percent wt%.

[0062] Formulation and properties of table 1 sulfoaluminate clinker

[0063]

[0064]

[0065] It can be seen from the data listed in the above table 1 that when the C of the sulfoaluminate clinker 2 S includes 30% α' type C 2 S, the alkalinity of the sulfoaluminate clinker hydration system increases, and its pH value increases by 0.7, see the data of Example 1 and Comparative Example 1.

[0066] It can be seen from the data listed in the above table 1 that when the C of the sulfoaluminate clinker 2 S includes 53.3% of α'-type C 2 When S, the alkalinity of the sulfoaluminate clinker hydration system increases, and its pH value increases by 1.1, see the data of Example 2 and C...

Embodiment 4- Embodiment 7 and comparative example 4- comparative example 7

[0070] Select the formula of the above-mentioned sulphoaluminate clinker with the highest alkalinity in the early stage, that is, the sulphoaluminate cement of Example 2, and prepare samples of sulphoaluminate cement according to the formula listed in Table 2 below, according to the standard GB20472-2006 Measure the alkalinity of the hydration system of the sulphoaluminate cement, measure the compressive strength of the sulphoaluminate cement according to the standard GB / T 17671-1999, the test results are shown in Table 2, and the ratio in the table is weight percent wt%.

[0071] Formulation and properties of table 2 sulphoaluminate cement

[0072]

[0073] As can be seen from the data listed in the above table 2, in comparative example 4-comparative example 7, potassium hydroxide is not added, only anhydrite, silica-alumina material (such as slag powder and / or phosphorus slag powder) and / or Or siliceous materials (such as silica fume powder and / or nano-silica), which can...

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Abstract

The invention provides high-alkalinity and high-strength sulphoaluminate cement which includes, by mass, 30-90% of a sulphoaluminate clinker, 0.1-5% of KOH, 4.9-55% of a component A and 5-30% of gypsum, wherein the component A is a Si / Al material and / or a silicon material. The sulphoaluminate clinker includes, by mass, 30-60% of C2S (comprising 30-60% of alpha'-type C2S and 40-70% of beta-type C2S), 5-30% of C4AF, 1-5% of 2C2S.CaSO4, and 28-64% of a component B which is a mixture of CaSO4 and a substance described as the specification. The cement is used for marine engineering construction; during early stage, high alkalinity is supplied to prevent corrosion of steel bars; and during later stage, high strength is supplied to prolong the service life. The cement has excellent comprehensiveperformance and is more practical.

Description

technical field [0001] The invention relates to the field of marine building materials, in particular to a high-alkalinity and high-strength sulphoaluminate cement, which is especially suitable for marine engineering. Background technique [0002] Sulphoaluminate cement is a kind of cementitious material with fast strength and excellent characteristics of hourly service. It is often used in the rapid construction of marine projects. In view of the increasingly important marine strategy, sulphoaluminate cement will have broad applications in my country in the future . [0003] Although sulfoaluminate cement has the above-mentioned advantages, it also has certain disadvantages, among which the following two disadvantages hinder its application in marine engineering to a certain extent: [0004] 1. If sulfoaluminate cement is used in reinforced concrete, after adding water for hydration, the main source of pH increase in the hydration system is the C in the cement. 2 Hydration...

Claims

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Application Information

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IPC IPC(8): C04B7/32
CPCC04B7/32Y02P40/10
Inventor 张洪滔张文生汪智勇
Owner CHINA BUILDING MATERIALS ACAD
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