Try Drying It!
Case studies in the dissemination of tray-drying technology
Shows how improving on the traditional techniques of drying by sun and air can provide income-generating activities for groups in the developing world. Examples from Peru, Colombia and Bangladesh; with detailed technical appendices.
Published: 1991
Pages: 72
eBook: 9781780443683
Paperback: 9781853390395
| Why use gypsum plaster? l | |||
|---|---|---|---|
| Gypsum or gypsum plaster? 2 | |||
| Gypsum plaster — a well proven technology 2 | |||
| The use of gypsum plaster 3 | |||
| Manufacture 5 | |||
| 1. Raw gypsum 5 | |||
| A) Types of raw gypsum | |||
| B) Sources | |||
| 2. Gypsum plaster 7 | |||
| A) The chemistry of plaster | |||
| B) Types of plaster | |||
| 3. Tests and standards 11 | |||
| A) Recognizing gypsum | |||
| B) Testing gypsum plaster | |||
| 4. Production technologies 18 | |||
| A) Extraction | |||
| B) Preparing gypsum | |||
| C) Calcining (heating) | |||
| 5. Economics of production 30 | |||
| A) Production inputs | |||
| B) Cost comparison with Portland cement | |||
| C) Choice of technology | |||
| Use in building 35 | |||
| 1. Wet' uses 35 | |||
| A) Plastering | |||
| B) Plaster mortars | |||
| C) Plaster concrete | |||
| D) Decoration | |||
| 2. Prefabricated elements 38 | |||
| A) Plasterboard | |||
| B) Reinforced gypsum plaster | |||
| C) Earth blocks stabilized with gypsum plaster | |||
| D) Plaster blocks | |||
| Glossary 43 | |||
| Selected bibliography 45 | |||
| Contact addresses 47 | |||
| Case studies | |||
| Case study 1: Field testing retarders 15 | |||
| Case study 2: U.K. — manual crusher 20 | |||
| Case study 3: Cape Verde Islands — flat-plate kiln 25 | |||
| Case study 4: Mauritania — open-pan kiln 26 | |||
| Case study 5: Iran — structural plaster 37 | |||
| Case study 6: Ecuador — plaster ceiling panels 39 | |||
| Case study 7: Turkey — stabilized block 40 | |||
| Case study 8: Cape Verde Islands — wall block 41 |
Barrie Axtell
Barrie Axtell worked in the UK food industry for over 10 years, in 1981, he joined ITDG to start its agroprocessing programme and then became a private consultant providing technical consultancy inputs to agencies such as FAO, ILO, UNIFEM and ITDG.
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