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A platform for research: civil engineering, architecture and urbanism
BELITE CALCIUM ALUMINATE AS AN ADDITIVE
The present invention relates to the use of a belite calcium aluminate obtainable in a method comprising the following steps: a) providing a starting material that has a molar Ca/(Si+Al+Fe) ratio from 1.0 to 3.5 and a molar Al/Si ratio from 100 to 0.1, b) mixing the raw materials, c) hydrothermal treating of the starting material mixture produced in step b) in an autoclave at a temperature from 100 to 300 °C and a residence time from 0.1 to 24 h, wherein the water/solids ratio is 0.1 to 100, d) tempering the intermediate product obtained in step c) at 350 to 600 °C, wherein the heating rate is 10-6000 °C/min and the residence time is 0.01 - 600 min as an accelerator for Portland cement. The present invention also relates to a method for accelerating the early stiffening/setting and/or the hardening of binders containing Portland cement by addition of the belite calcium aluminate, and to binders containing Portland cement and the accelerator.
BELITE CALCIUM ALUMINATE AS AN ADDITIVE
The present invention relates to the use of a belite calcium aluminate obtainable in a method comprising the following steps: a) providing a starting material that has a molar Ca/(Si+Al+Fe) ratio from 1.0 to 3.5 and a molar Al/Si ratio from 100 to 0.1, b) mixing the raw materials, c) hydrothermal treating of the starting material mixture produced in step b) in an autoclave at a temperature from 100 to 300 °C and a residence time from 0.1 to 24 h, wherein the water/solids ratio is 0.1 to 100, d) tempering the intermediate product obtained in step c) at 350 to 600 °C, wherein the heating rate is 10-6000 °C/min and the residence time is 0.01 - 600 min as an accelerator for Portland cement. The present invention also relates to a method for accelerating the early stiffening/setting and/or the hardening of binders containing Portland cement by addition of the belite calcium aluminate, and to binders containing Portland cement and the accelerator.
BELITE CALCIUM ALUMINATE AS AN ADDITIVE
ALUMINATE DE CALCIUM-BELITE COMME ADDITIF
SCHMITT DIRK (author) / BEN HAHA MOHSEN (author) / ITUL ANCA (author) / SPENCER NICOLAS (author)
2018-02-20
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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