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Journal of Polymer & Composites Original Research

Influence of Supplementary Cementitious Materials on Chemical Shrinkage in Cement

  1. Akash Gehlot Department of Civil Engineering, Malaviya National Institute of Technology, Jaipur
  2. Pawan Kalla Department of Civil Engineering, Malaviya National Institute of Technology, Jaipur

Abstract

Chemical shrinkage is the volume reduction observed in cement during early hydration due to chemical reactions, which critically influences the internal stresses, cracking tendencies, and durability of cementitious system. Present study is focused on effect of supplementary cementitious material (SCM) on chemical shrinkage. Dilatometry method is used to assess the impacts of SCMs on chemical shrinkage, in this this study. The research incorporates experiments with laboratory-synthesized cement and three SCMs—fly ash, GGBS, and silica fume in various proportions. The experiments monitored the progression of chemical shrinkage in cement paste and drying shrinkage in mortar mixes over time, maintaining a water-to-cementitious materials ratio of 0.40. Shrinkage measurements were conducted using volumetric method. For their ability to provide reliable data on the material's volume changes during hydration, this method was chosen. In addition to physical measurements, the study also employed Fourier Transform Infrared Spectroscopy (FTIR) to analyse the microstructural changes within the cement mixes. The findings validated results of dilatometry in measuring chemical shrinkage. The study revealed that the addition of silica fume tends to increase shrinkage strains, whereas higher amounts of fly ash and GGBS reduces the magnitude of chemical shrinkage across all cement types tested. This trend was consistent with the literature and underscores the potential of SCMs to modify the physical properties of cement. The FTIR analyses further gave better understanding of the different phases present during the hydration process, which offers deeper insights into how these changes affect the overall behaviour of the material.

Keywords

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