Synergistic effect of cement mortar types and encapsulated healing agents on crack healing in sustained notched concrete beams subjected to flexural loads
Rasha A. El-Sadany, Hossam El-Din M. Sallam, Mohamed A. R. Elmahdy
TL;DR
This study explores how different cement mortars and healing agents can help concrete beams repair cracks on their own when under stress.
Contribution
The study introduces a systematic evaluation of pozzolanic materials and encapsulated healing agents for autonomous crack healing in concrete beams.
Findings
Silica fume (SF) achieved 87.5% crack sealing and 20% load recovery due to enhanced pozzolanic activity.
Microstructural analysis confirmed SF's role in matrix densification and interfacial refinement.
Marble powder (MP) acted mainly as an inert filler with limited healing contribution.
Abstract
Reinforced concrete structures have a critical durability challenge due to crack formation, facilitating moisture penetration, steel corrosion, and progressive structural deterioration. To address these challenges, this work systematically investigates the synergistic effects of pozzolanic materials in cement mortar and encapsulated healing agents on the autonomous repair capability of sustainable concrete notched beams under flexural loading. In this work, an experimental program consisting of three types of cement mortar with dimensions of 50 × 50 × 220 mm, it was performed using advanced material systems involving pozzolanic additives (silica fume (SF), marble powder (MP) and an encapsulated system incorporating expansive minerals (MgO, CaO, and bentonite) in macro-capsules with a thickness of 0.45 mm, a length of 50 mm, and inner diameters of 6.15 mm and 11.4 mm for the inner and…
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Taxonomy
TopicsMicrobial Applications in Construction Materials · Concrete and Cement Materials Research · Concrete Corrosion and Durability