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19. Nov 2020 | Application Areas

Progress and challenges in self-healing cementitious materials

A review reports on the latest developments in cement research related to the synthesis of cement and concrete materials with autogenous healing and/or self-healing capability.

A concrete bridge as symbol.

Self-healing cementitious materials are a research area that has attracted a great deal of attention. Image source: Free-Photos - Pixabay (symbol image).

Concrete is a very common material consisting of a mixture of aggregates (sand, gravel, crashed rock) and paste (cement, water and additives). The paste component, made up mainly of cement and water, degrades with time. Despite this shortcoming, research toward the next-generation cement and concrete materials has intensified in the past 10–15 years.

Self-healing cementitious materials, in particular, are a research area that has attracted a great deal of attention. A number of novel formulations have demonstrated an increase in mechanical and chemical stability with respect to conventional Portland cement, through the addition of inorganic, organic, and even biological additives. A new review reports on the recent developments in cement research related to its synthesis and concrete materials with autogenous healing and/or self-healing capability.

Performance of each cementitious material

These include geopolymers, engineered cementitious materials, bacterial cement composites, microencapsulated self-healing materials, self-healing assisted by shape-memory alloys, and polymer–cement composites. The work describes the performance of each cementitious material and the mechanism responsible for healing, including a section on atomistic simulations and modeling of cementitious materials.

A detailed understanding of various cement technologies with autogenous healing and self-healing properties, including their strengths and weaknesses, is critical to determine the areas where new development is needed to enable novel, energy-efficient, and environmentally responsible cement and concrete solutions. To this end, molecular simulations can play a significant role and have already demonstrated promise in achieving an atomic level view of interactions between cementitious materials and other add-on compounds, such as carbon nanotubes or polymers for enhanced reinforcement or autonomous healing properties.

The review can be found in Journal of Materials Science volume 56, 2021.

EC Library Waterbased Acrylates for Decorative Coatings

Books

Waterbased Acrylates for Decorative Coatings

Aqueous polyacrylates, as binders, dispersing resins and thickening polymers, are nowadays impossible to do without as raw materials in the paints and coatings industry. Since their introduction in the 1950s and 60s, straight acrylic and styrene acrylic dispersions have established themselves as environment-friendly, high-performace alternatives to the solvent-borne, air-drying alkyd resin binders used principally before. The particularly wide performance spectrum and high level of variability of the polyacrylates has enabled the propagation and consistent ongoing development of this product class as binders for coating materials. This book gives an overall view of the preparation and properties of aqueous acrylic dispersions and also the special features pertaining to their use in the architectural coatings sector. Following a general introduction to dispersions and emulsion paints manufacture at the beginning of the book, specialized chapters give a deeper insight into the diverse products such as primers, masonry paints, interior paints, plasters, wood coatings and gloss emulsion paints. The book presents an picture of the preparation of acrylic binders and the formulation of architectural paints. It is aimed both at students and newcomers to the paints and coatings field as well as at experienced dispersion users and practitioners in the paints and coatings industry.

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