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WHITE CSA CEMENT - CALUMEX
1. April 3, 2017
The 6th International Drymix Mortar
Conference Nürnberg
2. agenda
INTRODUCTION
White cement , production , phase formation
ADJUST
calcium aluminate CAC , CSA WHITE ,ACA
calcium sulfate
SHRINKAGE DRY-MIX
problems and how to overcome them
CONCLUSION
closing
3. White Portlandcement
raw feed ; limestone + kaolin + sand
high energy consumption (~1600°C )
sintering
low impurity raw materials
clinker cooled quickly (water quenching)
decorative use
4. main phase composition
C3S alite
C2S belite
C3A tri calcium aluminate
CaSO4 calcium sulfate (≤ 5%)
(added at grinding stage )
6. replacement or part replacement of White Portlandcement
by source of high aluminum containing cement ;
reduce alkalinity
prevent efflorescence (lime bloom)
accelerate set
increase early strength
improve color consistency / sustainability
adjust
7. alumina cement
White calcium aluminate cement (CAC)
White calcium sulfo aluminate cement (CSA)
Amorphous calcium aluminate (ACA)
8. CAC WHITE
raw feed ; refined alumina+ limestone
refractory cement
sintering
calcination temperature ( ~1550° C.)
grinding clinker (blaine 4200-4600 g/cm2)
main phase composition CA +CA2
(monocalcium aluminate+calcium di-aluminate)
9. CSA WHITE
raw feed ; white bauxite + limestone + calcium sulphate
choice of high purity raw materials
sintering
tight control calcination (1250~1300° C.)
cooling of clinker
grinding clinker high fineness
(blaine 4800-5200 g/cm2)
main phase composition C4A3Š +C2S
(calcium aluminum sulfate hydroxide+belite)
10. ACA
raw feed ; bauxite + limestone
fused
calcination temperature ( ~1700° C.)
rapid cooling
grinding clinker (blaine 6000 g/cm2)
main phase composition C12A7 + CA
(mayenite+monocalcium aluminate)
11. calcium sulfate
a chemical reaction of aluminum , calcium and sulphate
ions forms calcium aluminum sulfate hydroxide , ettringite
crystals (Aft)
tetra calcium tri aluminate sulfate (C4A3Š)
3(CaO.Al2O3.3CaSO4.32H2O)
ettrinigite crystals;
needle-rod-, hexagonal, shaped
average size 1 ~ 7 μ
12. early ettringite formation
ternary cement matrix ;
compensation of shrinkage – expanding in volume
increase of initial strength – sulfate ions go in solution more rapid
than aluminate and silicate phase
accelerated drying - mobs up excess water ,32 water molecules
higher density - filling pores and cavities
amount and type of sulfate variable
22. tile grout
low porosity (low water absorption)
low alkali – (effluoresence , colour fading)
shrinkage compensation
early gelling allows fast and easy cleaning
rapid strength development
reduction of pigments
41. self leveling overlay
stable base color
easy to pigment
no effluoresence
rapid strength development
high abrasion resistance
shrinkage compensated
short walk-on time
42. CSA WHITE
CSA WHITE proofs to be a good cost effective alternative
acting as cementious binder it features;
lower temperature on hydration
stable white color
fast set
high early strength
no loss of strength in time
reduced shrinkage
elevated bond strength
rapid drying
reduced porosity
no free lime
low alkali
49. enviroment
CSA White cement “green binder label” having a ;
decreased amount of limestone reduces release of CO2
(CSA=3CaO·3Al2O3·CaSO4 (36.7%) opposed to OPC=3CaO·SiO2 (73.7%)
lower calcination temperature (~300 °C lower than OPC clinker)
clinker is more friable than other clinker lower grinding cost
possible use of industrial by-products
50. acknowledgements
I would like to express my thanks and gratitude to
Dr.Torsten Kowald and his team at the
Institut für Bau- und Werrkstoff chemie
University of Siegen
and my colleagues at Caltra Lab
for their research and assistance
51. thank you for your kind attention
You are happily invited to visit us at ECS
hall 7 booth 422
and at ECS CONFERENCE
Tomorrow afternoon at 13:30-14:00
“Choosing right Sulphate”