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Additives for a hydraulic binder based on a belite-calcium-sulphoaluminate-ferrite clinker

A technology of sulfoaluminate and ferrite, applied in cement production, sustainable waste treatment, solid waste management, etc., can solve the problems of low hydraulic hardness of limestone, achieve the effect of reducing the amount of clinker and high long-term mechanical strength

Inactive Publication Date: 2012-05-30
LAFARGE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, limestone has the disadvantage of having lower hydraulicity and also slows down the change in mechanical strength of the BCSAF cement after setting

Method used

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  • Additives for a hydraulic binder based on a belite-calcium-sulphoaluminate-ferrite clinker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0211] Material:

[0212] Obtain described BCSAF clinker by limestone, kaolin, calcium sulfate, iron oxide, its chemical composition is given in the following table 1, and expressed with respect to the mass percent of total mass:

[0213] Table 1

[0214]

[0215] Preparation of BCSAF clinker:

[0216] Preparation of raw materials: The raw materials were previously milled individually to verify the following properties:

[0217] -0% refus at 200μm

[0218] - Up to 10% oversize at 100 μm.

[0219] Weighing, mixing and homogenization of raw materials: The raw meal according to step a) of the process of the invention is prepared. Weighing is carried out according to the proportions defined in Table 2 below and expressed in mass percent relative to the total mass of the raw meal:

[0220] Table 2

[0221] ％

limestone

Kaolin

Bauxite

Anhydrite

iron oxide

BCSAF raw meal

61.36

24.80

3.35

5.47

5.02

[0...

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Abstract

The subject of the present invention is a composition comprising at least, in % expressed by weight relative to the total weight of composition, from 0.01 to 3% of polycarboxylic acid or one of the salts of said polycarboxylic acid comprising from 2 to 4 carboxyl groups per molecule; and from 97 to 99.99% of a Belite-Calcium-Sulphoaluminate-Ferrite clinker (BCSAF clinker).

Description

technical field [0001] The present invention relates to a composition comprising belite-calcium-sulfoaluminate-ferrite clinker (BCSAF clinker) and at least one polycarboxylic acid or a salt thereof, its use for the production of hydraulic binders , Use of a cement comprising said clinker and a polycarboxylic acid or a salt thereof for increasing the mechanical strength of a hydraulic binder. Background technique [0002] BCSAF clinkers are clinkers with low or no alite content, which is one of the mineralogical phases of conventional Portland-type clinkers. Alite is calcium trisilicate (Ca 3 SiO 5 ), whose traditional symbol is C 3 S. [0003] For the remainder of the specification of the present invention, unless expressly stated otherwise, the following abbreviated symbols will be used to designate the mineralogical composition of cement: [0004] -C stands for CaO (lime), [0005] -A is for Al 2 o 3 (bauxite), [0006] -F stands for Fe 2 o 3 , [0007] -S stan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B28/02C04B28/06C04B7/345C04B28/14
CPCC04B7/323C04B28/065C04B2111/00206C04B28/025C04B7/3453C04B28/14C04B2111/00215C04B28/04C04B40/0039C04B2201/50C04B24/04C04B18/025C04B22/002C04B14/00Y02P40/10Y02W30/91C04B22/064C04B22/066C04B22/147C04B24/06C04B24/122C04B14/28C04B18/08C04B18/142
Inventor G·瓦伦塔E·加特内V·莫兰
Owner LAFARGE SA
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