Detail publikace

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.

Originální název

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

Anglický název

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

Jazyk

en

Originální abstrakt

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.

Anglický abstrakt

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.

Dokumenty

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",
  annote="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.",
  address="Springer Netherlands",
  chapter="95629",
  institution="Springer Netherlands",
  number="10",
  volume="2012",
  year="2012",
  month="october",
  pages="1--6",
  publisher="Springer Netherlands",
  type="journal article - other"
}