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PhD Defense by Sonja Haastrup

Sonja Haastrup, Department of Chemistry and Bioscience will defend her thesis on: "Impact of micro silica on the properties of the porous calcium silicate products"

Time

09.05.2018 kl. 13.00 - 09.05.2018 kl. 16.00

Description

TITLE:

"Impact of micro silica on the properties of the porous calcium silicate products"

ABSTRACT:

Skamol A/S produces calcium silicate for thermal insulation systems. The two key raw materials used in the production of calcium silicate are quicklime (QL) and micro silica (MS). QL is obtained by calcination of limestone, whereas MS is a by-product from the silicon and silicon-alloy production. QL and MS react in water to form a C-S-H gel (from cement notation, C=CaO, S=SiO2 and H=H2O), after reaction the C-S-H gel is pressed to boards and autoclaved. In the autoclave the C-S-H gel crystallizes. The raw materials highly influence the calcium silicate product properties. MS from different production sites is found to highly influence the calcium silicate product properties. To obtain a steady production, with uniform product properties, it is of interest to obtain a better understanding of how MS influence the calcium silicate product properties.

In this work we find, that different MS types result in different calcium silicate product properties. This is due to difference in reaction rate. The reaction rate is found to be dependent of both impurities present in the MS and the MS particle size. Iron is found to influence the C-S-H gel formation and the crystallization in the autoclave. Processing conditions are also found to be very important for a well crystallized product. 

SUPERVISOR:

  • Professor Yuanzheng Yue, AAU
  • Jørgen Mikkelsen, Skamol

Co-supervisor:

  • Associate Professor Donghong Yu, AAU

ASSESSMENT COMMITTEE:

  • Associate professor Morten L Christensen, Department of Chemistry and Bioscience, AAU
  • Professor Thor Grande, Norges teknisk-naturvitenskapelige universitet, Norway
  • Doctor Hong Peng, Research Scientist, Elkem Materials, Norway

AFTER THE DEFENSE A SMALL RECEPTION WILL BE HELD AT FREDRIK BAJERS VEJ 7H. 

Price

Free

Host

Department of Chemistry and Bioscience, AAU, Section of Chemistry

Address

Fredrik Bajers Vej 7H, 9220 Aalborg Ø, room number: 1.102-6

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