Français
1. Gypsum-based materials and lightweighting
1.1 Gypsum
Gypsum, also known as plaster stone or alabaster, is a sedimentary rock formed by chemical precipitation from the evaporation of calcium salts dissolved in salt lakes or seawater. Precipitation of part of the evaporites, made up of calcium, magnesium and potassium chlorides and sulfates, is common in nature and forms large areas where gypsum is mined or quarried.
This mineral consists mainly of calcium sulfate dihydrate (CaSO 4 (H 2 O) 2 ) and occurs in nature as various crystalline phases, of which selenite (with hexagonal crystals) and alabaster (polycrystalline formations) are the most common
The Ultimate Scientific and Technical Reference
This article is included in
Plastics and composites
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Gypsum-based materials and lightweighting
Example of lightweight plaster made from recycled polymers
Bibliography
Websites
Buildex Inc. Haydite Expanded-Shale Lightweight Aggregate http://www.buildex.com/haydite.html (page consulted on September 10, 2011)
Standards and norms
- Plasterboard – Definitions, requirements and test methods - NF EN 520 - 2009
- Test methods for masonry mortars – Part 19: Determination of water vapor permeability of hardened plaster mortars - NF EN 1015-19/A1 - 2005
- Testing methods for natural stone – Determination of real and apparent densities and open and total porosities - NF EN 1936 - 2007
- Building materials and products – Hygrothermal properties...
Patents
ROMÁN ALEMA (B.), TORRES ZACARÍAS (P.). – Mortero de yeso con vermiculita expandida y aditivado, y procedimiento para su obtencion. Patent (Spain). ES2331043 B1 (2010).
WHINFIELD and DICKSON. – Improvements Relating to the Manufacture of Highly Polymeric Substances, British Patent 578,079,1941. Polymeric Linear Terephthalic Esters, U.S. Patent 2,465,319 (1949).
GUTIÉRREZ-GONZÁLEZ...
The Ultimate Scientific and Technical Reference
