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Prediction of microstructural evolution in fly ash-modified cementitious system: A computational study

Yadeta Andualem E., Goyal Pradeep K., Sarkar Raju

Materials Science Poland

2023

Vol. 41, No. 4

68--77

The intricate interaction between supplementary cementitious materials (SCMs) and cementitious systems profoundly influences the performance and sustainability of cementitious composites. This study explores the microstructural evolution of fly ash (FA)-modified cement paste by employing a three-dimensional cement hydration and microstructure development (CEMHYD3D) modeling package. Through comprehensive simulations, the influence of varying FA content on hydration phase evolution and pore structure within the cementitious system is revealed. As the proportion of FA within the cementitious mixtures increases, there is a substantial enhancement in the rate of hydration. Notably, the incorporation of FA introduces a significant augmentation in the hydration rate, a phenomenon with potential implications for the long-term performance of FA-modified cementitious materials. The prediction results also highlight that increasing FA substitution in cement leads to finer and more interconnected pore networks due to the pozzolanic reaction. These perceptions hold significant implications for optimizing cementitious mixes and advancing sustainable construction practices. The model-predicted results have been validated with experiments, and they are successful in predicting the microstructural evolution in FA-modified cement paste. In summary, the prediction model bridges the theoretical and practical implementation gaps by providing a thorough understanding of the microstructural evolution of FA-modified cement paste. Furthermore, it provides invaluable guidance for tailoring FA-blended cement compositions, thus promoting their enhanced performance and sustainability in the realm of cementitious materials.

Influence of ultrafine ground fly ash on the microstructure and properties of cementitious materials

Sanytsky M., Rusyn B., Halbiniak J., Szymańska J.

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

2013

nr 2(12)

96--102

The influence of the process of mechanical activation in electromagnetic mill on the properties of fly ash are shown. The effect of ultrafine fly ash and chemical admixtures of polyfunctional action on the properties of cementitious materials was investigated. It was observed that combination of such complex chemical admixtures and ultrafine fly ash provides the reaching of technological, technical and economical effects in сoncretes. The using of fly ash ultrafine particles gives the possibility of manipulation and control of properties of cementitious materials and design of High Performance Concretes new generation on their base.

Przeprowadzono badania wpływu ultradrobnego popiołu lotnego i domieszek chemicznych na właściwości materiałow cementowych. Stwierdzono, że kombinacja domieszek chemicznych i najdrobniejszych cząsteczek popiołow lotnych w betonie zapewnia osiągnięcie doskonałych efektow technicznych i ekonomicznych. Stosowanie bardzo drobno mielonych cząsteczek popiołu daje możliwości modyfikacji i kontroli właściwości materiałów cementowych oraz możliwość projektowania na ich podstawie wysokowartościowych betonow nowej generacji.