EVALUATION OF DISRUPTION OF CONCRETE CAUSED BY EXPOSURE TO HIGH TEMPERATURES BY INITIAL SURFACE ABSORPTION TEST

EVALUATION OF DISRUPTION OF CONCRETE CAUSED BY EXPOSURE TO HIGH TEMPERATURES BY INITIAL SURFACE ABSORPTION TEST

Peer-reviewed article not indexed in WoS or Scopus

If a concrete structure is exposed to high temperature, inner structure of concrete degrades. Level of permeability of the surface layer is important for evaporation of water vapor from the whole bulk of the structure. If permeability of the surface layer is low, explosive spalling can occur and steel reinforcement can be uncovered. One of methods of measuring permeability of the surface layer of concrete is the Initial Surface Absorption Test (ISAT). The paper states results of experimental determination of permeability of the surface layer of concrete before and after thermal load. Tested concretes contained basalt aggregate and lightweight expanded clay aggregate. Results of the measurements showed that structure of surface layer in case of concrete with lightweight expanded clay aggregate is less porous than the structure of concrete with basalt aggregates. Damages caused by exposer to high temperature were recorded on both tested mixtures but concrete with lightweight expanded clay aggregate resists better.

If a concrete structure is exposed to high temperature, inner structure of concrete degrades. Level of permeability of the surface layer is important for evaporation of water vapor from the whole bulk of the structure. If permeability of the surface layer is low, explosive spalling can occur and steel reinforcement can be uncovered. One of methods of measuring permeability of the surface layer of concrete is the Initial Surface Absorption Test (ISAT). The paper states results of experimental determination of permeability of the surface layer of concrete before and after thermal load. Tested concretes contained basalt aggregate and lightweight expanded clay aggregate. Results of the measurements showed that structure of surface layer in case of concrete with lightweight expanded clay aggregate is less porous than the structure of concrete with basalt aggregates. Damages caused by exposer to high temperature were recorded on both tested mixtures but concrete with lightweight expanded clay aggregate resists better.

Initial Surface Absorption Test (ISAT), high temperatures, lightweight expanded clay aggregate, basalt aggregate, normative heat curve ISO 834, fire risk

Initial Surface Absorption Test (ISAT), high temperatures, lightweight expanded clay aggregate, basalt aggregate, normative heat curve ISO 834, fire risk

NOVÁKOVÁ, I.; BODNÁROVÁ, L.; STAVAŘ, T.; HELA, R.

2016

01.08.2015

Asian Research Publishing Network

ARPN Journal of Engineering and Applied Sciences

1819-6608

ARPN Journal of Engineering and Applied Sciences

10

15

Islamic Republic of Pakistan

6299

6304

6

jeas_0815_2405