Publication detail

CRACK FORMATION RISK REDUCTION OF HPC/HSC BY SUITABLE CHOICE OF THE PLASTICIZER

ZACH, J., ŠŤASTNÍK, S.

Original Title

CRACK FORMATION RISK REDUCTION OF HPC/HSC BY SUITABLE CHOICE OF THE PLASTICIZER

English Title

CRACK FORMATION RISK REDUCTION OF HPC/HSC BY SUITABLE CHOICE OF THE PLASTICIZER

Type

conference paper

Language

Czech

Original Abstract

Development of HPC/HSC is focused on properties improvement by porosity reduction. Low porosity means lower permeability and low permeability guarantee mechanical properties and better durability. At practical production of these types of concrete the aim of the mix designers is to lower W/C ratio, which could be primarily achieved by superplasticizers. Concrete with low W/C ratio - achieved by the use of super plasticizers - tend to early age cracking in higher rate. These cracks decrease final performance of the concrete – mechanical properties, durability etc. One of the reasons of the early age crack formation and subsequent decrease of concrete performance is due to thermal expansivity. Thermal expansivity of HPC/HSC is higher then of other types of concrete due to higher amount of binder (generally CEM I 42,5 R or 52,5R) with higher and faster hydration heat development. Reactive kinetics highly depends on additives. It is possible to remarkably influence the hydration kinetics and thus risk of early age cracking.

English abstract

Development of HPC/HSC is focused on properties improvement by porosity reduction. Low porosity means lower permeability and low permeability guarantee mechanical properties and better durability. At practical production of these types of concrete the aim of the mix designers is to lower W/C ratio, which could be primarily achieved by superplasticizers. Concrete with low W/C ratio - achieved by the use of super plasticizers - tend to early age cracking in higher rate. These cracks decrease final performance of the concrete – mechanical properties, durability etc. One of the reasons of the early age crack formation and subsequent decrease of concrete performance is due to thermal expansivity. Thermal expansivity of HPC/HSC is higher then of other types of concrete due to higher amount of binder (generally CEM I 42,5 R or 52,5R) with higher and faster hydration heat development. Reactive kinetics highly depends on additives. It is possible to remarkably influence the hydration kinetics and thus risk of early age cracking.

Key words in English

Cement, Hydration heat

Authors

ZACH, J., ŠŤASTNÍK, S.

RIV year

2003

Released

1. 1. 2003

Publisher

Skurkon

Location

Praha

ISBN

80-86604-08-X

Book

2. mezinárodní sympósium FC a HPC

Pages from

100

Pages to

109

Pages count

10

BibTex

@inproceedings{BUT8628,
  author="Jiří {Zach} and Stanislav {Šťastník}",
  title="CRACK FORMATION RISK REDUCTION OF HPC/HSC BY SUITABLE CHOICE OF THE PLASTICIZER",
  booktitle="2. mezinárodní sympósium FC a HPC",
  year="2003",
  pages="10",
  publisher="Skurkon",
  address="Praha",
  isbn="80-86604-08-X"
}