Journal article
Durability Properties of Ultra-High Performance Lightweight Concrete (UHPLC) with Expanded Glass

Publication Details
Umbach, C.; Wetzel, A.; Middendorf, B.
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It is important to ensure the durability and safety of structures. In
the case of newly developed materials that are outside the current
rules, it is important to investigate all aspects of structural safety.
The material studied in the following is a structural lightweight
concrete with an ultra-high-performance matrix and expanded glass as a
lightweight aggregate. The material, with a compressive strength of
60–100 MPa and a bulk density of 1.5–1.9 kg/dm3, showed high
capillary porosities of 12 vol% (ultra-high-performance concretes (UHPC)
< 5 vol%). Since the capillary porosity basically enables transport
processes into the concrete, the material had to be examined more
closely from the aspect of durability. Freeze-thaw resistance (68 g/m2) and chemical attack with sulfate at pH 3.5 for 12 weeks (16 g/m2) showed no increase in concrete corrosion. Targeted carbonation (0.53 mm/year0.5) and chloride penetration resistance (6.0 × e−13 to 12.6 × e−13 m2/s)
also showed good results against reinforcement corrosion. The results
show that most of the measured capillary pores resulted from the
lightweight aggregate and were not all present as a pore system. Thus,
the durability was only slightly affected and the concrete can be
compared to an UHPC. Only the abrasion resistance showed an increased
value (22,000 mm3/5000 mm2), which, however, only matters if the material is used as a screed

Last updated on 2021-07-10 at 09:31