Cement Hydration Dynamics in Supplementary Cementitious Materials
Summary
Cement hydration in blends containing supplementary cementitious materials involves a complex sequence of chemical and physical processes that govern early-age strength development, microstructural evolution and long-term durability. Upon mixing with water, Portland cement phases dissolve to release calcium, silicate and aluminate ions, while supplementary materials such as fly ash, slag or silica fume undergo slower pozzolanic reactions that consume portlandite and form additional calcium silicate hydrate networks. The interplay between dissolution, nucleation and crystal growth, phase boundary interactions and diffusion controls the rate of heat release and the progression of the reaction degree. By tailoring the proportions and fineness of SCMs, it is possible to moderate peak hydration temperatures in mass structures, improve pore refinement and enhance resistance to chemical attack. These dynamics underpin the development of low-carbon concretes that reuse industrial by-products, reduce greenhouse-gas emissions and deliver high performance across diverse climates and construction scales. A detailed understanding of the underlying kinetics and phase assemblages is therefore essential to optimise mix design, predict temperature evolution in large pours and ensure long-term serviceability in sustainable infrastructure.
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Cement Hydration Dynamics in Supplementary Cementitious Materials publication trend
The graph below shows the total number of articles in cement hydration dynamics in supplementary cementitious materials across all publications each year (not limited to Nature Index journals).
Technical terms
Supplementary cementitious materials (SCMs): Industrial by-products such as fly ash, slag or silica fume that react with calcium hydroxide to form additional cementitious phases, improving durability and reducing carbon footprint.
Hydration kinetics: The study of rates and mechanisms by which cementitious materials dissolve, precipitate new phases and evolve heat during the transformation from paste to hardened solid.
Pozzolanic reaction: A secondary chemical process in which amorphous silica or alumina in SCMs reacts with portlandite (calcium hydroxide) to produce calcium silicate hydrate, refining pore structure and enhancing long-term strength.
Calcium silicate hydrate (C-S-H): The principal binding gel formed during cement hydration, responsible for strength and microstructural cohesion, whose morphology and distribution are key to mechanical performance and durability.
References
- Mechanical and Thermal Properties of Sustainable Low-Heat High-Performance Concrete. Sustainability (2023).
- The Effects of Curing Temperature on CH-Based Fly Ash Composites. Materials (2023).
- Property Analysis of Slag Composite Concrete Using a Kinetic–Thermodynamic Hydration Model. Applied Sciences (2021).
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