Publication detail

INFLUENCE OF POROSITY OF BASALT AGGREGATES ON FIRE RESISTANCE AND FREEZE-THAW DURABILITY OF FIBRE REINFORCED CONCRETE

NOVÁKOVÁ, I. THORHALLSSON, E. WALLEVIK, O. BODNÁROVÁ, L.

Original Title

INFLUENCE OF POROSITY OF BASALT AGGREGATES ON FIRE RESISTANCE AND FREEZE-THAW DURABILITY OF FIBRE REINFORCED CONCRETE

English Title

INFLUENCE OF POROSITY OF BASALT AGGREGATES ON FIRE RESISTANCE AND FREEZE-THAW DURABILITY OF FIBRE REINFORCED CONCRETE

Language

en

Original Abstract

The amount of pores and their size are the key parameters for enhancing fire resistance and freeze-thaw durability of concrete. Air content in fresh concrete and subsequent air voids in hardened concrete can be modified by applied type of aggregates and also by type and amount of added fibres. The target is to define the optimal amount of pores, which are beneficial for escape of water vapour from concrete structure on event of fire, and still preserve concrete from penetration of liquid water with potential content of chemicals into the concrete structure. In this study, basalt aggregates from Iceland (water absorption approx. 5%) and from Czech Republic (water absorption less than 1%) were used for preparation of test specimens. Basalt is evaluated as one kind of mineral in terms of its chemical and mineral composition, but characteristics of basalt aggregates used for production of concrete vary owing to their porosity. As dispersed fibre reinforcement, polypropylene fibres (PP-fibres) and basalt fibres were applied. Their impact on the air content in fresh concrete and the properties of hardened concrete was examined. It is well known that addition of PP-fibres improves fire resistance of concrete, but might slightly decrease compressive strength characteristic. Basalt fibres are also evaluated, so far little information are available about the behaviour of chopped basalt fibres applied as dispersed reinforcement in concrete and their influence on behaviour of concrete exposed to high temperatures, changes of strength characteristics and freeze-thaw durability.

English abstract

The amount of pores and their size are the key parameters for enhancing fire resistance and freeze-thaw durability of concrete. Air content in fresh concrete and subsequent air voids in hardened concrete can be modified by applied type of aggregates and also by type and amount of added fibres. The target is to define the optimal amount of pores, which are beneficial for escape of water vapour from concrete structure on event of fire, and still preserve concrete from penetration of liquid water with potential content of chemicals into the concrete structure. In this study, basalt aggregates from Iceland (water absorption approx. 5%) and from Czech Republic (water absorption less than 1%) were used for preparation of test specimens. Basalt is evaluated as one kind of mineral in terms of its chemical and mineral composition, but characteristics of basalt aggregates used for production of concrete vary owing to their porosity. As dispersed fibre reinforcement, polypropylene fibres (PP-fibres) and basalt fibres were applied. Their impact on the air content in fresh concrete and the properties of hardened concrete was examined. It is well known that addition of PP-fibres improves fire resistance of concrete, but might slightly decrease compressive strength characteristic. Basalt fibres are also evaluated, so far little information are available about the behaviour of chopped basalt fibres applied as dispersed reinforcement in concrete and their influence on behaviour of concrete exposed to high temperatures, changes of strength characteristics and freeze-thaw durability.

Keywords

basalt aggregates, porous system, chopped basalt fibres, fire resistance of concrete, freeze-thaw durability

Released

06.03.2017

Publisher

The Nordic Concrete Federation

Location

Eleventh High Performance concrete (11th HPC) and the Second Concrete Innovation Conference (2nd CIC), Tromso,Norway

Pages count

10

Documents

BibTex


@inproceedings{BUT131437,
  author="Iveta {Nováková} and Eythor {Thorhallsson} and Olafur {Wallevik} and Lenka {Bodnárová}",
  title="INFLUENCE OF POROSITY OF BASALT AGGREGATES ON FIRE RESISTANCE AND
FREEZE-THAW DURABILITY OF FIBRE REINFORCED CONCRETE",
  annote="The amount of pores and their size are the key parameters for enhancing fire resistance and freeze-thaw
durability of concrete. Air content in fresh concrete and subsequent air voids in hardened concrete can
be modified by applied type of aggregates and also by type and amount of added fibres. The target is
to define the optimal amount of pores, which are beneficial for escape of water vapour from concrete
structure on event of fire, and still preserve concrete from penetration of liquid water with potential
content of chemicals into the concrete structure.
In this study, basalt aggregates from Iceland (water absorption approx. 5%) and from Czech Republic
(water absorption less than 1%) were used for preparation of test specimens. Basalt is evaluated as one
kind of mineral in terms of its chemical and mineral composition, but characteristics of basalt aggregates
used for production of concrete vary owing to their porosity. As dispersed fibre reinforcement,
polypropylene fibres (PP-fibres) and basalt fibres were applied. Their impact on the air content in fresh
concrete and the properties of hardened concrete was examined. It is well known that addition
of PP-fibres improves fire resistance of concrete, but might slightly decrease compressive strength
characteristic. Basalt fibres are also evaluated, so far little information are available about the behaviour
of chopped basalt fibres applied as dispersed reinforcement in concrete and their influence on behaviour
of concrete exposed to high temperatures, changes of strength characteristics and freeze-thaw durability.",
  address="The Nordic Concrete Federation",
  chapter="131437",
  howpublished="electronic, physical medium",
  institution="The Nordic Concrete Federation",
  year="2017",
  month="march",
  publisher="The Nordic Concrete Federation"
}