INFLUENCE OF NATURAL LIGHTWEIGHT AGGREGATES ON THE PROPERTIES OF CONCRETE

Year 2017, Özel Sayı 2, 9 - 16, 23.11.2017

Cenk Karakurt , Uğur Özen

Abstract

As a result of the developing technology, the
construction industry has also gone to a great interest to discover new
materials. A lot of literature research has been done for the lightweight aggregates
used in the construction industry. In this study, different types of
lightweight aggregates are used for porous lightweight concrete production. For
this reason, 8-15 mm pumice and expanded perlite were obtained from Ankara
region, 4-8 mm pumice was supplied from Manisa Salihli, volcanic tuff aggregate
was obtained from Antalya and expanded clay was supplied from Holland. Before
lightweight concrete production, aggregates were separated into adequate
particle classes by sieve analysis in diameter with 4-8 mm, 8-11.2 mm and
11.2-15 mm. The expanded clay had a size of 0-4 mm and was separated into 0-1
mm and 1-4 mm sizes. The fresh concrete properties are determined by slump and
flow table tests. Hardened composite properties are evaluated by unit weight,
ultrasound pulse velocity, and compressive strength tests on 15x15x15 cm cubic
specimens. According to test results structural lightweight concrete can be
produced with those aggregates. Expanded clay and perlite reduced the
workability of the fresh concrete. Volcanic tuff and pumice provided to reach
compressive strength values over 25 MPa.

Keywords

concrete, natural lightweight aggregates

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