Cementitious Composites and Mechanical Properties of Fly Ash Cenospheres
Summary
Cementitious composites enriched with fly ash cenospheres represent a class of lightweight, sustainable construction materials in which hollow aluminosilicate microspheres derived from coal combustion by-products are incorporated into a cement matrix. These cenospheres reduce overall density, enhance thermal insulation and acoustic damping, and can improve durability through refined pore structure. Mechanically, the inclusion of cenospheres tends to lower compressive and flexural strength relative to dense aggregates, but appropriate proportions can yield strengths suitable for non-structural and semi-structural elements. Microstructural analysis reveals that cenospheres act as stress-redistribution sites and influence hydration kinetics, often promoting a more uniform capillary network. Hygrothermal performance is altered: water absorption and sorption increase with cenosphere content, while thermal conductivity decreases markedly, offering energy-efficient solutions for building envelopes. Challenges remain in balancing strength loss against density reductions and in optimising the interfacial transition zone to mitigate microcracking. Globally, these composites address fly ash disposal issues and support circular-economy goals by valorising industrial waste for lightweight concrete, insulating panels and specialised foams.
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Cementitious Composites and Mechanical Properties of Fly Ash Cenospheres publication trend
The graph below shows the total number of articles in cementitious composites and mechanical properties of fly ash cenospheres across all publications each year (not limited to Nature Index journals).
Technical terms
Cenosphere: Hollow, aluminosilicate microsphere recovered from coal fly ash, valued for low density and high strength.
Cementitious composite: A material system formed by a hydraulic binder (cement) combined with supplementary fillers to achieve targeted properties.
Compressive strength: The maximum axial load per unit area a material can sustain under crushing.
Porosity: The fraction of void spaces within a solid, influencing fluid transport and mechanical behaviour.
Thermal conductivity: The ability of a material to conduct heat, expressed in watts per metre-kelvin (W/mK).
References
- Hygrothermal and strength properties of cement mortars containing cenospheres. Cement and Concrete Research (2023).
- Sustainable application of cenospheres in cementitious materials – Overview of performance. Developments in the Built Environment (2020).
- The Effect of Fly Ash Microspheres on the Pore Structure of Concrete. Minerals (2020).
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