Multifunctional Precast Elements Made of Low Density Foam Concrete and UHPC

Author(s): B. Middendorf, A.Wetzel and C. Umbach
Paper category: Proceedings
Book title: 1st International Conference on UHPC Materials and Structures
Editor(s): Caijun Shi and Dehui Wang
ISBN: 978-2-35158-164-3
e-ISBN: 978-2-35158-165-O
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 2-7
Total Pages: 6
Language: English

Abstract: Heat insulation is important for house constructions and plays a key role in the European Energy Saving Ordinance, called EnEV. Therefore, low thermal conductivity of used building materials is required. A mineral based solution with low thermal conductivity is low-density air hardened foam concrete. Precast sandwich-elements made of ultra-high performance concrete (UHPC) as outer and inner shell material and air hardened foam concrete is subject of development and investigations. These multifunctional precast elements are intended to be used as wall elements for house constructions. For the optimisation of the foam concrete in terms of heat insulation and compressive strength, the general concept of UHPC with optimized packing density of the fines (<125 μm) was combined with the aeration of UHPC using aluminium powder or paste. Due to the packing density optimisation and the use of silica fume as reactive powder an autoclave hardening process is not necessary to gain a reliable strength. Parts of the quartz aggregates were replaced by
lightweight aggregates in order to increase the heat insulation. Therefore, perlite in grain sizes from 40 μm to 3 mm were used gaining a well density / strength ratio.

Online publication: 2016
Publication type : full_text
Public price (Euros): 0.00