Expanded glass
| Expanded glass | |
|---|---|
| origin | |
| raw materials | Waste glass |
| Primary energy consumption (production) | 2.1 MJ / kg |
| Material properties | |
| Thermal conductivity λ | from 0.035 W / (m K) to 0.70 W / (m K) |
| Specific heat capacity c | 1000 J / (kg K) |
| Bulk density ρ | 30 to 1100 kg / m³ |
| Vapor diffusion resistance μ | 3 |
| commitment | |
| Areas of application | (see: Use ) |
Expanded glass (granulate) is a building material made from recycled waste glass that is used in the production of lightweight concrete , lightweight plaster, lightweight masonry mortar and in thermal insulation panels, thermal insulation fillings, plaster base panels, curtain wall systems and decorative paints. Expanded glass is foamed glass with small, gas-filled pores and can be produced in grain sizes of 0.04–16 mm. The granulate has a closed lattice structure. In contrast to the angular, broken foam glass (gravel) , which is produced in a similar process, but compressed under pressure, expanded glass (granulate) consists of spheres / round grains, which enable versatile processing. Fills made of expanded glass are very light and yet pressure-resistant, heat-insulating, alkali-resistant, non-flammable, have a high load-bearing capacity and are not attacked by rodents, pests and fungi.
Manufacturing
Expanded glass is produced from broken glass. For this purpose, glass fractions smaller than 8 mm are predominantly used, which appear energetically unfavorable for remelting for the production of recycling bottles and containers.
The waste glass used for production is first crushed in mills into glass powder, then mixed with binding and blowing agents and then granulated. At temperatures of 800 to 900 ° C in the rotary kiln, the granulate expands and fine gas pores form inside the grain. As soon as the expanded glass has cooled down, it is divided into different grain sizes using a sieving process.
properties
Expanded glass is very light, round and free of broken grains, highly heat-insulating, sound-absorbing, pressure-resistant, non-flammable, acid-resistant, pest-proof and easy to work with. In principle, recycling is possible by melting the expanded glass again.
use
Light surcharge z. B. in:
- Dry mortar and construction chemical products: plasters, adhesive and reinforcement mortars, tile adhesives
- Fills, thermal insulation fills
- Load-bearing and capillary-breaking perimeter insulation
- Lightweight concrete
- Panel systems, drywall panels, thermal insulation panels, plaster base panels, curtain wall systems
- Plastic applications
- Special applications such as decorative paints
literature
- Jürgen Gänßmantel (Ed.): Ecology and building repair. WTA publication series Volume 21, Munich 2000, AEDIFICATIO Verlag, ISBN 978-3-931681-39-5 .
- Christiane Sauer: Made Of… New materials for architecture and design. Die Gestalten Verlag , Berlin 2010, ISBN 978-3-89955-293-5 .
Web links
- Product information from the Bavarian Chamber of Architects on behalf of the Federal Ministry for Transport, Building and Urban Development (BMVBS)
- Online specialist lexicon and information for construction from the architecture magazine BauNetz
- Data from waermedaemmstoffe.com database
Individual evidence
- ↑ data from sustainability- building.de (see under energy consumption)
- ↑ Technical data from an expanded glass supplier.
- ↑ Data from waermedaemmstoffe.com .
- ↑ BMVBS ( Memento from May 27, 2014 in the Internet Archive ) Product information from the Bavarian Chamber of Architects on behalf of the Federal Ministry for Transport, Building and Urban Development
- ↑ BAUNETZ KNOWLEDGE
- ↑ Technical data Poraver®. Dennert Poraver GmbH, February 19, 2018, accessed on February 19, 2018 .