Sökning: "calcium carbonate"

Visar resultat 16 - 20 av 54 avhandlingar innehållade orden calcium carbonate.

  1. 16. Phase development, heat of hydration and expansion in a blended cement with b-hemihydrate and anhydrite as calcium sulfate

    Författare :Cecilie Evju; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dilatation; isothermal calorimetry; in-situ synchrotron powder diffraction; ettringite; calcium sulfate; Shrinkage compensating cement; expansive cement; Materiallära; Material technology; materialteknik;

    Sammanfattning : Expansive cements are utilised in special applications to improve properties such as cracking caused by drying shrinkage. Several types of expansive cements exist and the main hydration product responsible for the expansion is ettringite, [Ca3Al(OH)6]2(SO4)3·26H 2O. LÄS MER

  3. 17. Interfacial Adhesion Failure : Impact on print-coating surface defects

    Författare :Hajer Kamal Alm; Lars Wågberg; Göran Ström; Janet Preston; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ink-paper coating adhesion; offset printing; calcium carbonate pigments; polyacrylate; dispersant; print mottle; surface chemistry; hygroscopy of surfaces; coating structure; print quality; water interference mottle; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Sammanfattning : The aim of this work was to develop a solid knowledge on formulation effects controlling offset ink-paper coating adhesion and to identify key factors of the coating and printing process affecting it. Focus lay on comprehending the impact of pigment dispersant on ink-paper coating adhesion and ultimately on the print quality of offset prints. LÄS MER

  4. 18. On calcium-related problems in kraft pulping of Eucalyptus dunnii

    Författare :Vijaya Lakshmi Vegunta; Olena Sevastyanova; Helena Håkansson; KTH; []
    Nyckelord :Fiber- och polymervetenskap; Fibre and Polymer Science;

    Sammanfattning : Kraft pulping is the most widely used pulping process for producing chemical pulp today. It has been in use for more than 130 years. LÄS MER

  5. 19. Fuel conversion and ash formation interactions : a thermochemical study on lignocellulosic biomass

    Författare :Anna Strandberg; Markus Broström; Rainer Backman; Christoffer Boman; Maria Zevenhoven; Umeå universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Char conversion; pyrolysis; devolatilization; ash transformation; biomass; fuel characterization; fuel composition; ash composition; silicate formation; carbonate formation; thermogravimetric analysis; micro-tomography;

    Sammanfattning : Biomass is considered to be CO2 neutral, and to be able to reduce the dependency on fossil fuels the need for expanded and sustainable biomass feedstock is increasing. Ash-related problems are some of the most important aspects of this increasing use of new biomass assortments in thermal energy conversion systems. LÄS MER

  7. 20. Characterisation and Consolidation of Historical Lime Mortars in Cultural Heritage Buildings and Associated Structures in East Africa

    Författare :Athuman M. K. Ngoma; Jonas Holmgren; Jan Erik Lindqvist; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; East Africa; Stone Town; historical building; mortar; deterioration; consolidation; calcium hydroxide solution; Building engineering; Byggnadsteknik;

    Sammanfattning : For the period of several centuries, the influence of several distinct cultures produced rich and diverse cultural heritage that we see today in East Africa countries. The most tangible remains of these heritages are stone built buildings and structures including, palaces, mosques, residential houses and tombs. LÄS MER