Publication detail

The synthesis and characterisation of an expansive additive for M-type cements. Part II. Investigation of shrinkage compensation effect during early stages of hydration process

OPRAVIL, T. PTÁČEK, P. ŠOUKAL, F. HAVLICA, J. BRANDŠTETR, J. OPRAVILOVÁ, L.

Original Title

The synthesis and characterisation of an expansive additive for M-type cements. Part II. Investigation of shrinkage compensation effect during early stages of hydration process

Type

journal article - other

Language

English

Original Abstract

The expansion effect of laboratory-prepared expansive additives for M-type expansive cement was investigated at the early stage of hydration by the multicell isoperibolic calorimeter and volumetric technique based on Archimedes principle. The relative volume changes and heat released during hydration are strongly affected by the content of lime in the expansive additive due to the influence of CaO on the kinetics and mechanism of formation of ettringite. The increasing content of lime favours the formation of monosulphate and its later transformation to ettringite generating expansion stress. The effect of expansive additive on the behaviour of mortar samples was measured as linear elongation of test blocks using Graf-Kaufman dilatometer. Lower or higher content of lime in expansion additive slightly decreases the 7th-day compressive and flexural strength of samples while this effect is negligible for expansive additive with nominal composition of ettringite.

Keywords

Expansive additive, Hydration, Ettringite, Monosulphate, Calorimetry, Dilatometry.

Authors

OPRAVIL, T.; PTÁČEK, P.; ŠOUKAL, F.; HAVLICA, J.; BRANDŠTETR, J.; OPRAVILOVÁ, L.

RIV year

2012

Released

18. 10. 2012

Publisher

Springer Netherlands

Location

Maďarská republika

ISBN

1388-6150

Periodical

Journal of Thermal Analysis and Calorimetry

Year of study

2012

Number

10

State

Hungary

Pages from

1

Pages to

6

Pages count

6

BibTex

@article{BUT95629,
  author="Tomáš {Opravil} and Petr {Ptáček} and František {Šoukal} and Jaromír {Havlica} and Jiří {Brandštetr} and Lenka {Opravilová}",
  title="The synthesis and characterisation of an expansive additive for M-type cements. Part II. Investigation of shrinkage compensation effect during early stages of hydration process",
  journal="Journal of Thermal Analysis and Calorimetry",
  year="2012",
  volume="2012",
  number="10",
  pages="1--6",
  issn="1388-6150"
}