“Masonry mortar physico-mechanical properties” refers to measurable behaviors that govern how mortars transfer loads, resist cracking, and perform over time in masonry assemblies. Although the term is used in building engineering rather than clinical medicine, the underlying scientific framework is analogous to biomedical material science: formulation determines microstructure, microstructure determines mechanical response, and both ultimately influence long-term functional outcomes.
At the physico level, mortar performance begins with fresh-state properties (workability, water demand, setting behavior) and continues into hardened-state transport mechanisms (porosity, pore-size distribution, permeability to water and gases). These features control moisture migration, capillary absorption, freeze–thaw susceptibility, and the likelihood of salt crystallization. In masonry, mortar sits at interfaces between units, so its ability to wet, bond, and accommodate small deformations influences stress redistribution and reduces the risk of debonding.
At the mechanical level, the key outcomes include compressive strength, flexural (or tensile) resistance, adhesion to masonry units, elastic modulus, and fracture-related metrics. Compressive strength reflects the mortar’s capacity to bear in-plane compressive stresses, while tensile and flexural performance govern crack initiation and propagation under bending, thermal cycling, and lateral loading. Elastic modulus affects stiffness compatibility with bricks or blocks; poor compatibility can concentrate strains and accelerate damage.
A central determinant of these properties is the aggregate phase. Recycled aggregates—typically derived from crushed construction and demolition waste—introduce greater surface roughness and residual attached particles (such as old mortar). These can increase water absorption and modify the interfacial transition zone (ITZ) between cementitious matrix and aggregate. The ITZ is critical: it often becomes the weakest microstructural link controlling early cracking, higher permeability, and reduced strength if not properly managed. However, recycled aggregates can also contribute to densification through particle packing effects and can promote mechanical interlocking at the ITZ.
Natural fibers are incorporated to address tensile behavior and crack control. Fiber reinforcement aims to improve post-cracking toughness by bridging microcracks, limiting crack width, and promoting energy dissipation during fracture. The mechanism depends on fiber geometry, tensile strength, aspect ratio, and bond characteristics with the cementitious matrix. In practice, fibers can reduce brittleness and increase ductility, but they also complicate mixing: excessive fiber content may increase voids and reduce compressive strength by disrupting paste continuity. Therefore, optimization seeks a balance—enough fiber to improve fracture resistance without compromising matrix integrity.
The “optimization” of masonry mortar using recycled aggregates and natural fibers typically involves adjusting multiple formulation variables: water-to-binder ratio, aggregate grading and pre-treatment, fiber type (e.g., plant-based fibers), fiber length and dosage, admixtures, and curing regime. Lowering the water-to-binder ratio generally reduces porosity and improves strength, but workability must be preserved using plasticizers or carefully tuned mixing. Pre-saturating recycled aggregates may mitigate water steals into the matrix, improving effective water availability for cement hydration. Admixtures can also enhance dispersion, reduce segregation, and refine pore structure.
Experimental characterization usually includes physico-mechanical tests such as compressive strength (e.g., cube or prism testing), flexural strength (three- or four-point bending), direct tensile or splitting tensile where appropriate, and adhesion-related tests depending on masonry unit type. Microstructural assessments—often via scanning electron microscopy, mercury intrusion porosimetry, or related techniques—support interpretation by linking measured properties to ITZ morphology and pore-size distribution. Durability-relevant measures may include water absorption, sorptivity, and permeability proxies, which are essential because strength alone cannot predict long-term masonry resilience.
The practical clinical-relevant analogy for interpretation is “structure–function coupling.” If the mortar’s pore network is too connected, moisture ingress accelerates chemical degradation and increases the risk of corrosion in embedded reinforcement (where present) or deterioration of masonry interfaces. Conversely, overly stiff or low-toughness mortars may be mechanically incompatible, creating a propensity for brittle cracking. Fiber addition can increase fracture energy and delay crack coalescence, potentially improving the safety margin under service loads.
In synthesis, optimizing recycled-aggregate mortar with natural fibers is an engineered approach to improve both performance dimensions: strengthening through improved hydration efficiency and densified microstructure, and toughening through fiber-bridging and controlled crack development. The resulting mortar seeks sustainable material use while maintaining adequate mechanical capacity and moisture-related durability for masonry applications.
Source: Applsci (Applied Sciences) post referencing the MDPI paper on optimizing masonry mortar using recycled aggregates and natural fibers.
Applied Sciences MDPI: Read paper “Optimizing Masonry Mortar: Experimental Insights into Physico-Mechanical Properties Using Recycled Aggregates and Natural Fibers” from our EBM Prof. Dr. Paulo Santos (University of Coimbra, Portugal). See more at. #breaking
— @Applsci May 1, 2026
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