Influence of aggressive exposure on the degradation of nano-silica admixed cementitious mortar integrated with phase change materials

Article


Snehal, K., Das, B. B. and Barbhuiya, S. 2022. Influence of aggressive exposure on the degradation of nano-silica admixed cementitious mortar integrated with phase change materials. Construction and Building Materials. 335 (Art. 127467). https://doi.org/10.1016/j.conbuildmat.2022.127467
AuthorsSnehal, K., Das, B. B. and Barbhuiya, S.
Abstract

The objective of the present study is to evaluate the stability of cementitious mortar incorporated with phase change material (PCM, n-octadecane) at aggressive exposure conditions such as acid (1% H₂SO₄), alkali (5% Na₂SO₄) and chloride (5% NaCl). Thermogravimetric analysis (TGA) was performed to characterize and quantify the amount of deleterious compounds such as ettringite (Ca₆Al₂(SO₄)₃(OH)₁₂·26H₂O, AFt), gypsum (CaSO₄·2H₂O Gy) and Freidel’s salt (Ca₂Al(OH)6(Cl, OH)·2H₂O, Fs) formed due to the action of SO₄²⁻ (acidic and alkaline media) and Cl⁻ (chloride media) ions at the continuous exposure period of 180 days. Mass loss associated to the thermal degradation of n-octadecane PCM (CH₃(CH₂)₁₆CH₃) at various exposure solutions was also calculated at the temperature boundary of 250–300 °C. This study also highlights the introduction of optimized nano-silica dosage (3%) into the PCM based cementitious mortar to counteract the undesirable facets of PCMs on cementitious system.

Results revealed that incorporation of PCM in cementitious mortar augmented the amount of AFt, Gy (at acid and alkali exposure solution) and Fs (at chloride exposure solution) formation, responsible for the amplified rate of deterioration. It is important to be noted that after long term exposure of 180 days no traces of PCM was observed in PCM based cementitious mortar mixes, which signifies the mixes no longer holds the capacity to store energy. However, co-occurrence of nano-silica (3%) in PCM based cementitious mixes curtailed the negative impact of PCM on cementitious mortars exposed to aggressive conditions significantly. Further, differential thermogravimetric (DTG) curve shows an additional endothermic peak at 250–300 °C for 3% nano-silica modified PCM based cementitious mixes even after exposure to aggressive ions that implies the ability of the mix to sustain the thermal efficiency characteristics of PCMs.

JournalConstruction and Building Materials
Journal citation335 (Art. 127467)
ISSN0950-0618
Year2022
PublisherElsevier
Accepted author manuscript
License
File Access Level
Anyone
Digital Object Identifier (DOI)https://doi.org/10.1016/j.conbuildmat.2022.127467
Publication dates
Online20 Apr 2022
Publication process dates
Accepted09 Apr 2022
Deposited22 Apr 2022
Copyright holder© 2022 Elsevier
Permalink -

https://repository.uel.ac.uk/item/8q862

Download files


Accepted author manuscript
SK-BBD-SB- (PCM Aggressive Exposure).pdf
License: CC BY-NC-ND 4.0
File access level: Anyone

  • 69
    total views
  • 12
    total downloads
  • 0
    views this month
  • 1
    downloads this month

Export as

Related outputs

Artificial Intelligence in Concrete Mix Design: Advances, Applications and Challenges
Barbhuiya, S. and Sharif, S. 2023. Artificial Intelligence in Concrete Mix Design: Advances, Applications and Challenges. 3ICT 2023: International Conference on Innovation and Intelligence for Informatics, Computing, and Technologies. University of Bahrain, Bahrain 20 - 21 Nov 2023 IEEE.
Life Cycle Assessment of construction materials: Methodologies, applications and future directions for sustainable decision-making
Barbhuiya, S. and Das, B. B. 2023. Life Cycle Assessment of construction materials: Methodologies, applications and future directions for sustainable decision-making. Case Studies in Construction Materials. 19 (Art. e02326). https://doi.org/10.1016/j.cscm.2023.e02326
A comprehensive review towards sustainable approaches on the processing and treatment of construction and demolition waste
Trivedi, S. S., Snehal, K., Das, B. B. and Barbhuiya, S. 2023. A comprehensive review towards sustainable approaches on the processing and treatment of construction and demolition waste. Construction and Building Materials. 393 (Art. 132125). https://doi.org/10.1016/j.conbuildmat.2023.132125
Strength and Microstructure of Geopolymer Based on Fly Ash and Metakaolin
Barbhuiya, S. and Pang, E. 2022. Strength and Microstructure of Geopolymer Based on Fly Ash and Metakaolin. Materials. 15 (Art. 3732). https://doi.org/10.3390/ma15103732
A comprehensive review on the use of hemp in concrete
Barbhuiya, S. and Bhusan Das, B. 2022. A comprehensive review on the use of hemp in concrete. Construction and Building Materials. 341 (Art. 127857). https://doi.org/10.1016/j.conbuildmat.2022.127857