Abstract
Abstract This work was conducted to evaluate the hardening phenomenon of pastes formulated with Portland cements blended with limestone filler (CPIIF), ground blast furnace slag (CPIIE) or pozzolan (CPIIZ). Vicat test, isothermal conduction calorimetry and oscillatory rheometry were the methods used to monitor this transition. The results of Vicat test indicates the faster setting time of pozzolan cement, but no information before this time was obtained. Using isothermal calorimetry was possible to monitor the related changes to the chemical reactions since the first contact with water, and using rheometry, the rate and force of cement particles agglomeration. The main purpose of this work was not extensively explain the results of these three methods, but show that they are complementary to better explain the transition from fluid-to-solid behavior in function of different kind of mineral addition.
Highlights
IntroductionThe utilization and acceptation of blended Portland cements with granulated blast furnace slag, natural or artificial pozzolan and limestone filler as a supplementary cementitious materials (SCMs) is a common practice worldwide and is growing up [1] with the aim of to reduce the CO2 release due to the cement production
This work was conducted to evaluate the hardening phenomenon of pastes formulated with Portland cements blended with limestone filler (CPIIF), ground blast furnace slag (CPIIE) or pozzolan (CPIIZ)
The utilization and acceptation of blended Portland cements with granulated blast furnace slag, natural or artificial pozzolan and limestone filler as a supplementary cementitious materials (SCMs) is a common practice worldwide and is growing up [1] with the aim of to reduce the CO2 release due to the cement production
Summary
The utilization and acceptation of blended Portland cements with granulated blast furnace slag, natural or artificial pozzolan and limestone filler as a supplementary cementitious materials (SCMs) is a common practice worldwide and is growing up [1] with the aim of to reduce the CO2 release due to the cement production. This does not mean that changes are not occurring This is an important gap of the Vicat test, because the comprehension of physico-chemical transformations during the very early age is essential in many processes of cement compositions, mainly due to the wide options of SCMs used nowadays. A more detailed assessment of main events associated to consolidation since the very early age is necessary, which are not perceptible by Vicat test These phenomena may be accompanied by using oscillatory rheometry to monitor the kinetic of consolidation, and isothermal conduction calorimetry for early hydration reactions. In both cases, there is a continuously monitoring of hardening since the first contact of water-cement. Follow is presented a brief explanation of each technique used in this work to facilitate the comprehension of discussions
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