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Refractory materials
Young’s modulus in dry mortar
7. June 2017
13,400 m² expanded glass acoustic ceiling for the Louvre Abu Dhabi
17. January 2019

Refractory materials with Poraver®

Improved thermal insulating properties and processing 


For economical production with high-temperature processes, it is necessary to minimise energy loss within the scope of energy management by means of suitable insulation measures. Poraver® expanded glass granules are characterised by their low density, high strength, round grain shape and thermal insulation properties. Poraver® is worldwide established as a lightweight aggregate for dry mortar, lightweight concrete, panels, insulating fills and special applications.

Applications

Poraver® is an excellent lightweight aggregate and filler for a wide variety of refractory products and can be used similar to vermiculite or expanded shale respectively clay (ESCS - Expanded Shale, Clay and Slate). 

Unshaped (monolithic) products

  • Heat resistant lightweight concrete

  • Insulating mortar

  • Backfills

  • Gunning mixes

  • Ramming mixes

  • Insulating fills

Shaped products  

  • Moulded parts from refractory lightweight concrete

  • Insulating concrete parts

  • Insulating panels

Poraver® Advantages

  • 7 different grain sizes from 0.04 mm to 4 mm allow the composition of a sieve line with a dense structure

  • The density can be specifically adjusted by selecting different grain sizes and very good thermal insulation properties can be achieved

  • The spherical shape, low weight and high compressive strength of the Poraver® grain make it easy and safe to process the mixes

  • Compared to many other lightweight fillers, Poraver® offers low water absorption, which reduces the water requirement of the mixture and therefore achieves high strength

  • Poraver® offers a constant material quality and chemical composition - ensuring consistent quality of the finished products

Trials

In the following trials Poraver® was tested in hydraulically hardening, unshaped (monolithic) and insulating refractory lightweight concretes. The material properties were tested on a pourable mixture for a firing at 1,000 °C.

Conclusion

The measurements on the tested system clearly show that the technological properties of the product are within the desired range even after the firing at 1,000° C. The flexural strength of the mortar, after firing, corresponds almost to the value of the initial test and the compressive strength is approximately 1/3 lower than before the test. The remaining longitudinal shrinkage of the system of -0.8 % is within the acceptable range.

Guide formulation for lightweight refractory concrete as PDF

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