Abstract
Abstract This paper is the work of working group 3 of the RILEM Technical Committee on Hydration and Microstructure of Concrete with SCM (TC 238-SCM). The pore solution is an essential but often overlooked part of hydrated cements. The composition of the cement pore solution reflects the ongoing hydration processes and determines which solid phases are stable and may precipitate, and which phases are unstable and may dissolve. The study of the cement pore solution therefore contributes to the understanding of the mechanisms as well as of the kinetics of cement hydration. This paper reviews the impact of supplementary cementitious materials (SCMs) on the pore solution composition of blended cements. In a first part, the extraction and analysis methods of cement pore solutions are reviewed, leading to a set of practical guidelines and recommendations. In a second part, an extensive literature survey is used to document the effect of the addition of SCMs (blast furnace slag, fly ash and silica fume) on the pore solution. Finally, in a third part the collected literature data are compared to thermodynamic simulations. The performance and current limitations of thermodynamic modelling of blended cement hydration are demonstrated and discussed in view of future progress.
Highlights
This paper aims to contribute to the understanding of the reaction mechanisms and kinetics of supplementary cementitious materials (SCMs) in combination with Portland cement (PC) by reviewing their impact on the liquid phase of cement paste
Practical guidelines are given for the extraction and the chemical analysis of the cement pore solution
Reported experimental data on pore solution composition are collected in a database and variations in composition over time and between systems are statistically evaluated and described
Summary
This paper aims to contribute to the understanding of the reaction mechanisms and kinetics of supplementary cementitious materials (SCMs) in combination with Portland cement (PC) by reviewing their impact on the liquid phase of cement paste. An extensive literature survey was carried out and information on chemical composition of the components, the mixture proportions of the pastes and the concentrations of hydroxide ions, sodium, potassium, calcium, sulfate, silicon and aluminium in the pore solution [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42] were summarised in a database available as electronic supplementary source. This paper is not dealing with durability but with the reaction mechanisms of SCMs. The publications mentioned above were not included in the database because the information on pore solution composition is limited to alkalinity
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
