Will Modified Cementitious Materials Change the Way We Build Infrastructure?

The modified cement-based materials are often specially designed to repair the specific cracked regions of concrete structures. Since these are meant for partial crack repair and not for constructing the main concrete structure, they are designed to offer a stronger bonding with the separated crack surfaces to reinstate the structural integrity. Therefore, the overall performance of modified cement-based materials, including mechanical properties, is generally superior to that of conventional cement-based materials in order to maintain the performance of the repaired substrate. Given their enhanced mechanical performance, can modified cement-based materials replace conventional cement-based materials?

Conventional cement-based materials are available in different strength grades. From the perspective of the fundamental mechanics of concrete, a concrete substance with higher strength generally possesses lower ductility and greater brittleness. For large-scale concrete structures that rely on ductility to withstand environmental and mechanical loading, such high-strength concrete is not an appropriate material for the primary structural body. Hence, it is first necessary to define what is meant by "modified cement-based materials."

Modified cement-based materials used for repairing cracked concrete are generally not mixed with materials that are difficult to disperse uniformly, such as nanoparticles or fibers, because the repair process requires good workability and flowability of the repair mortar. As a result, repair-oriented modified cement-based materials are typically unable to simultaneously improve both strength and ductility and therefore not suitable for replacing conventional cement-based materials for the construction of infrastructure.

However, if the term "modified cement-based materials" refers instead to cement-based materials incorporating nanoparticles, fibers, or formulations specifically modified for 3D printing, then they have the potential to transform the way infrastructure is constructed. More broadly, such advanced cement-based materials could fundamentally change construction methods for a wide range of concrete-based buildings and infrastructure.

Learn more about Nextus Innovations Laboratory, Research Support, Project Consultancy