Chapter 2: Lightweight Gypsum: Methods of Preparation and Use
A. Vimmrová, PhD
Department of Building Materials and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Prague, Czech Republic
Part of the book: Gypsum: Sources, Uses and Properties
The paper deals with the methods of preparation and utilization of gypsum based lightweight materials. Indirect method means the lightening by the lightweight fillers. Lightweight fillers suitable for gypsum (inorganic, organic, waste) are described. In directly lightened materials the pores are incorporated directly into the gypsum paste either by direct gas releasing chemical reaction between the components or mechanically by the help of surface active agents. Reactions suitable for chemical lightening of gypsum are described. Surface active agents can be added directly into the gypsum slurry and the mixture is mixed at high speed or foam is prepared in advance in special device and added into the gypsum slurry. Types of surface active substances are listed. Bulk density, compressive strength and thermal conductivity of materials prepared by the different methods are summarized in tables. The advantages and disadvantages of particular methods are given. Potential utilization of gypsum lightweight materials is suggested.
Keywords: lightweight gypsum, lightening methods, lightweight fillers, foaming, SAA
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