The Effect of Heat Curing on the Early-Strength Development of Low-Carbon Concrete

Anna Antonova*, Ekaterina Illarionova, Fahim Al-Neshawy, Jouni Punkki

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

Abstract

The production of cement clinker requires the heating of raw materials up to a temperature of 1450 ℃, making it the third largest industrial energy consumer, generating 6–7% of global CO2 emissions. The fastest alternative for reducing the environmental impact of the cement industry is the partial replacement of cement clinker with supplementary cementitious materials (SCM). Due to the high price of silica fume and the sharp decrease in fly ash, ground granulated blast furnace slag seems the most promising SCM for the latter purpose. However, the high level of cement clinker substitution with slag can delay the setting and hardening time of low-carbon concrete. In the scope of this study, heating cables are applied to investigate the effect of heat treatment on the early-strength development of low-carbon concrete. The heating cables are used to supply enough energy to the slag grains and activate their hydration. The amount of heating energy, starting time and duration of heating are tested to accelerate the hardening time of cement with 40–70% of slag to the same level as cement with around 20% of slag (CEMII/B), which is the most used in Finland. Also, the optimum curing process with the least demand for electricity is estimated. The heating system was developed to uniformly distribute the defined amount of heat inside the cast samples. The experimental methods applied to evaluate the development of compressive strength included tracking of the ultrasound pulse velocity, rebound hammer and continuous temperature measurement.

Original languageEnglish
Title of host publicationInternational RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures. SynerCrete 2023
PublisherSpringer
Pages809-819
Number of pages11
Volume2
ISBN (Electronic)978-3-031-33187-9
ISBN (Print)978-3-031-33186-2
DOIs
Publication statusPublished - 2023
MoE publication typeA3 Book section, Chapters in research books
EventInternational RILEM Confrerence on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures - Milos Island, Greece
Duration: 15 Jun 202316 Jun 2023

Publication series

NameRILEM Bookseries
Volume44
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852

Conference

ConferenceInternational RILEM Confrerence on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures
Abbreviated titleSynerCrete
Country/TerritoryGreece
CityMilos Island
Period15/06/202316/06/2023

Keywords

  • blast furnace slag
  • early strength development
  • heat treatment
  • Low carbon concrete

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