Sulfoaluminate-Portland cement composite system additive, fast-hardening early-strength concrete and preparation method of concrete

A technology of portland cement and sulfoaluminate, applied in the direction of organic chemistry, can solve the problems that it is difficult to show good adaptability of the binary composite system, so as to enhance the high plastic retention effect, avoid the freezing of water at low temperature, increase the Effect of Calcium Solubility and System Alkalinity
CN105884239AActive Publication Date: 2016-08-24HUBEI UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUBEI UNIV
Publication Date
2016-08-24

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Abstract

The invention provides a sulfoaluminate-Portland cement composite system additive and prepared sulfoaluminate-Portland cement-based fast-hardening early-strength concrete. The sulfoaluminate-Portland cement composite system additive is prepared from components in percentage by mass as follows: 70%-78% of a water reducing agent, 1.2%-2.5% of an early-strength agent, 18%-25% of a retarder and 2%-4% of an anti-freezing agent. The sulfoaluminate-Portland cement composite system additive can significantly improve the initial flow performance of the sulfoaluminate-Portland cement-based concrete, delay the setting time of a cement composite system, reduce the slump loss and effectively resolve the contradiction between liquidity and early strength and has composite effects of water reduction, delayed coagulation, early strength and the like, and a related preparation method is simple and suitable for popularization and application.
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Description

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to a sulphoaluminate-portland cement composite system admixture, rapid-hardening and early-strength concrete and a preparation method thereof. Background technique

[0002] Ordinary sulphoaluminate cement (SAC) clinker is calcined at 1300-1400°C with proper composition of limestone, bauxite and gypsum as raw materials. The main mineral of clinker is C 4 A 3 S and C 2 S, and a small amount of free gypsum and iron phase. C 4 A 3 S minerals make sulfoaluminate cement have excellent characteristics such as early strength, high strength, impermeability, frost resistance, corrosion resistance and low alkalinity, and at the same time C 4 A 3 The hydration activity of S is very high, and a large amount of ettringite (AFt), C-S-H and aluminum hydroxide (AH 3 ) gel, so that the cement can obtain higher early strength, and the 1d and 3d strength can reach 60-70% of the 28d ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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