Effectiveness of Nano-Engineering-Infused Repair Mortars in Restoring Structural Integrity of Concrete Exposed to High Temperatures

DOI

10.2991/978-94-6239-693-7_30How to use a DOI?

Keywords

Nano mortars; strength recovery; bond performance; durability

Abstract

This study evaluates the effectiveness of nano enriched repair mortars in restoring the mechanical and durability performance of concrete exposed to elevated temperatures. Concrete structures subjected to fire or thermal loading experience significant strength loss, deterioration of bonding zones, and increased permeability, which complicate post fire rehabilitation and long-term service performance. An experimental program was carried out in which concrete specimens were cast and cured under controlled conditions, then heated to 200, 400, and 600 degrees Celsius to simulate thermal damage. After natural cooling, the specimens were repaired using a 20-millimeter-thick mortar containing 1 percent nano silica, followed by curing and testing. The evaluation included compressive strength tests on cube specimens, split tensile strength tests on cylindrical specimens, and durability assessment through pull off bond strength, water absorption, and sorptivity. Compressive strength increased from 28.5 to 33.4 MPa at 200 degrees Celsius, from 19.7 to 28.1 MPa at 400 degrees Celsius, and from 11.3 to 17.6 MPa at 600 degrees Celsius after repair. Split tensile strength improved from 0.95 to 1.65 MPa at 600 degrees Celsius. Pull off bond strength reached 1.72 MPa at 200 degrees Celsius and 0.86 MPa at 600 degrees Celsius. Water absorption ranged from 4.2 percent to 7.9 percent, and sorptivity increased from 0.18 to 0.31 with rising temperature. The results confirm that nano enriched repair mortars can substantially recover strength and durability in heat damaged concrete, providing quantitative evidence for their application in post fire structural rehabilitation.

Copyright

© 2026 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - T. Shanthala
AU  - D. Neeraja
PY  - 2026
DA  - 2026/06/16
TI  - Effectiveness of Nano-Engineering-Infused Repair Mortars in Restoring Structural Integrity of Concrete Exposed to High Temperatures
BT  - Proceedings of the International Conference on Intelligent Systems for a Sustainable Future (ISSF 2026)
PB  - Atlantis Press
SP  - 295
EP  - 303
SN  - 2589-4919
UR  - https://doi.org/10.2991/978-94-6239-693-7_30
DO  - 10.2991/978-94-6239-693-7_30
ID  - Shanthala2026
ER  -