In the quest for sustainable construction materials, a groundbreaking study led by Kofi Mawuli Djokoto from the Advance Material Science Division has unveiled promising advancements in calcined clay pozzolan cement, a lower-carbon alternative to traditional cement. Published in the journal ‘Advances in Materials Science and Engineering’ (which translates to ‘Advances in Materials Science and Engineering’ in English), this research could significantly impact the energy sector by offering a more eco-friendly and durable building material.
The study focuses on the use of synthesized calcium silicate hydrate (CSH), produced via the sol-gel method, to enhance the performance of calcined clay pozzolan cement. Djokoto and his team characterized the CSH using x-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy, ensuring a comprehensive understanding of its properties. The synthesized CSH was then used as a minor admixture, ranging from 1 to 3 wt.% of calcined clay Portland cement, with 30% of the Portland cement substituted with calcined clay.
The results were striking. The CSH admixture significantly improved compressive strength, particularly at a 3% dosage, which showed the highest strength at 28 days. “This optimum mix achieved a 12.6% reduction in CO2 emissions compared with reference samples,” Djokoto noted, highlighting the environmental benefits of the innovation. While increased CSH reduced flowability, it markedly enhanced durability by lowering water absorption by up to 34% at 3 days and improving the pore structure, as evidenced by reduced sorptivity.
The implications for the energy sector are substantial. As the construction industry seeks to reduce its carbon footprint, the adoption of calcined clay cement enhanced with CSH could become a game-changer. “The synthesized CSH enhanced early strength development and durability, making calcined clay cement a more viable and sustainable option,” Djokoto explained. This advancement not only promises to lower emissions but also to improve the longevity and performance of construction materials, ultimately benefiting the energy sector by reducing the need for frequent repairs and replacements.
The study’s findings suggest that future developments in the field could focus on optimizing the synthesis and application of CSH in various cementitious materials. As the construction industry continues to evolve, the integration of such innovative materials could pave the way for more sustainable and efficient building practices. Djokoto’s research, published in ‘Advances in Materials Science and Engineering,’ serves as a beacon of progress, inspiring further exploration and application of these cutting-edge materials.