Impact of C–S–H seeds on cementitious hydration kinetics: New insights on porosity and microstructure

Faisal Qadri, Sudharsan R. Kumar, Nishant Garg

Research output: Contribution to journalArticlepeer-review


In the past decade, several studies have demonstrated C-S-H seeds to be a new series of concrete admixtures which can accelerate hydration kinetics and improve strength. However, data on microstructural changes in the presence of these seeds is limited. In this study, we systematically investigate the impact of a range of C-S-H seed dosages (0–3.5%). Broadly, on one hand, we find that increasing C-S-H seed dosage decreased the setting time and porosity. On the other hand, the addition of seeds increased the compressive strength via the precipitation of additional hydration products. Specifically, in 3-day-old mixtures, at the highest seed dosages (3.0–3.5%): a) porosity decreased from 15.5% to 10.9%, and b) compressive strength increased from 20.7 MPa (3004 psi) to 31.3 MPa (4532 psi). Finally, and most importantly, our laser profilometry experiments indicate that two key surface roughness parameters Spc (peak curvature) and Spd (peak density) strongly correlate to the mixes' open porosity, providing evidence for microstructural refinement.

Original languageEnglish (US)
Article number107763
JournalMaterials Today Communications
StatePublished - Mar 2024
Externally publishedYes


  • Accelerator
  • C-S-H seeds
  • Chemical admixture
  • Compressive strength
  • Open porosity

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Materials Chemistry


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