Carbon sequestration and performance enhancement of lime mortar modified with natural additives for sustainable construction

Authors

  • Nisha Sankar Department of Civil Engineering, SRM Institute of Science and Technology, College of Engineering and Technology, Kattankulathur, Chengalpattu District, Tamilnadu, India Author https://orcid.org/0009-0004-3531-0081
  • Ravi Ramadoss Department of Civil Engineering, SRM Institute of Science and Technology, College of Engineering and Technology, Kattankulathur, Chengalpattu District, Tamilnadu, India Author https://orcid.org/0000-0002-5380-370X

DOI:

https://doi.org/10.62638/ZasMat1941

Abstract

This study investigated the potential of lime mortar modified with starchy extract and Terminaliachebula to enhance carbon capture and utilization (CCU) for sustainable construction applications. The modified mortars were evaluated using compressive strength testing, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and BET pore structure analysis to assess mechanical performance, carbonation behavior, and microstructural evolution.Results showed that starchy extract-modified mortar improved carbonation by 39.7% and mechanical performance by 15.2% due to enhanced pore refinement and moisture retention, reducing pore volume to 0.068 cc/g compared with the reference mortar (0.075 cc/g). Chebula-modified mortar exhibited the lowest pore volume (0.061 cc/g), indicating a denser microstructure formed through tannin-Ca²⁺ interactions, promoting cohesion, water retention, and formation of amorphous calcium carbonate (ACC). The combined additive mortar exhibited the highest pore volume (0.080 cc/g), creating an optimized pore network that enhanced CO₂ diffusion and maintained matrix stability, resulting in 35% higher compressive strength and 3.46% greater CCU efficiency than the reference mortar.Microstructural analysis confirmed enhanced calcite formation in starchy extract mortar, ACC-rich matrices in Chebula mortar, and balanced crystalline-amorphous carbonate phases in the combined system. The findings demonstrate that natural organic additives significantly improve carbonation, carbon sequestration, and mechanical performance of lime mortar for sustainable non-load-bearing construction applications.

Keywords:

Lime mortar, carbon sequestration, carbon capture and utilization (CCU), sustainable material

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25-08-2026

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