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Hydraulic binder based on sulfoaluminous clinker and on portland clinker

A technology of portland and calcium sulfoaluminate is applied in the field of preparing hydraulic binders, which can solve the problems of not meeting standard requirements and failing to achieve performance, and achieve the effect of high short-term mechanical strength

Inactive Publication Date: 2011-11-23
LAFARGE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Clinker with a low content of tricalcium silicate produces a cement with short-term mechanical strength that does not meet the standard requirements and cannot achieve the properties required by today's modern concrete applications

Method used

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  • Hydraulic binder based on sulfoaluminous clinker and on portland clinker
  • Hydraulic binder based on sulfoaluminous clinker and on portland clinker
  • Hydraulic binder based on sulfoaluminous clinker and on portland clinker

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preparation example Construction

[0142] Another aspect of the present invention is to provide a process for the preparation of a composition according to the present invention comprising the step of contacting Portland clinker or Portland cement with BCSAF clinker. The process for the preparation of this composition according to the invention may optionally comprise a milling and / or homogenisation step.

[0143] The dicalcium silicate-calcium sulfoaluminate-ferrite clinker (BCSAF) of the composition according to the invention can be obtained according to the method described in the patent application WO 2006 / 018569, or the BCSAF clinker can be obtained with the patent application WO 2006 / 018569 The BCSAF clinker described in 2006 / 018569 is the same.

[0144] The BCSAF clinker of the composition according to the invention can be prepared according to other methods, in particular in the following manner:

[0145] a) Preparation of a raw meal comprising a raw material or a mixture of raw materials capable of pr...

Embodiment

[0188] Material:

[0189] -Portland Cement (hereinafter referred to as OPC):

[0190] - BCSAF clinker obtained from limestone, kaolin, calcium sulphate, iron oxide, the chemical composition of which is given in Table 1 below and expressed in % by mass relative to the total mass of the composition:

[0191] Table 1

[0192]

[0193] Preparation of BCSAF clinker:

[0194] Preparation of raw materials:

[0195] Raw materials were previously ground separately to demonstrate the following characteristics:

[0196] - 0% refus at 200 microns

[0197] - Maximum amount of 10% sieve coarse material at 100 microns.

[0198] Weighing, mixing and homogenizing raw materials :

[0199] The starting materials for step a) of the process according to the invention are prepared. Weighing is carried out according to the proportions defined in Table 2 below and expressed in % by mass relative to the total mass of the raw meal:

[0200] Table 2

[0201]

[0202] After weighin...

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Abstract

The subject of the present invention is a composition comprising at least one Portland clinker and one belite-calcium-sulfoaluminous-ferrite (BCSAF) clinker.

Description

technical field [0001] The present invention relates to a composition comprising at least sulphoaluminate clinker and Portland clinker, its preparation method and its use for the preparation of a hydraulic binder. Background technique [0002] The vast majority of modern concrete is made from hydraulic cement, usually obtained from clinker. Portland clinker is produced by heating a fine and homogeneous mixture comprising, for example, limestone, clay, silica and iron ore in a rotary kiln to temperatures typically above 1350°C. After firing the mixture, the clinker is in the form of nodules which, after cooling, are ground with calcium sulphate and other mineral additions to form Portland cement. In order to obtain clinker with tricalcium silicate as its main mineral phase, a very high content of limestone in the mixture of raw materials introduced into the kiln is necessary. Tricalcium silicate is an impure form of calcium trisilicate, Ca 3 SiO 5 , whose conventional not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B28/06C04B28/02
CPCC04B28/065C04B28/14C04B7/02C04B14/304C04B14/305C04B22/064C04B22/142C04B22/143C04B7/323
Inventor G·瓦伦塔C·孔帕雷V·莫兰E·加特内
Owner LAFARGE SA