Detail publikačního výsledku
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
English 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
Peer-reviewed article not indexed in WoS or Scopus
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.
English 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.
Key words in English
Expansive additive, Hydration, Ettringite, Monosulphate, Calorimetry, Dilatometry.
Authors
OPRAVIL, T.; PTÁČEK, P.; ŠOUKAL, F.; HAVLICA, J.; BRANDŠTETR, J.; OPRAVILOVÁ, L.
RIV year
2013
Released
18.10.2012
Publisher
Springer Netherlands
Location
Maďarská republika
ISBN
1388-6150
Periodical
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume
2012
Number
10
State
Hungary
Pages from
1
Pages to
6
Pages count
6
Full text in the Digital Library
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"
}