Al-Qadisiyah Journal for Engineering Sciences

Physical properties of cementitious composite material with Iraqi bentonite as partial cement replacement under elevated temperatures

Document Type : Research Paper

Authors

Bashar H. Ismael 1, 2
Sheelan Mahmoud Hama 3
Mustafa Mohammed Aljumaily 4
Abeer W Alshami 4
Saif Alzabeebee 5

1 Civil Engineering Department, Al-Maarif University College, Ramadi, Anbar, Iraq

2 Department of Engineering Affairs, University of Fallujah, Iraq

3 Department of Civil Engineering, University Of Anbar, Ramadi, Anbar, Iraq

4 Department of Civil Engineering, Al-Maarif University College, Ramadi, Iraq

5 Department of Roads and Transport Engineering, University of Al-Qadisiyah, Iraq

10.30772/qjes.2024.149089.1209
Abstract
The impact of higher temperatures on the qualities of normal-strength mortar containing Iraqi bentonite powder (BP) as a partial substation of cement was examined in the present research. The bentonite concrete was made by replacing cement with bentonite in weight ratio of 5 and 10%. A strength test (compressive strength) was performed, and the durability performance (mass loss) and absorption were performed and discussed. The results showed that samples containing bentonite outperformed the control mix regarding heat endurance. The flowability of the mixture decreased by 15% and 25% for 5% and 10%BP, respectively. Bentonite-containing concrete had a lower compressive strength than the control mix at ambient temperature and at 300 o C by 22.8% and 38.9, respectively for 5%BP and 10.5% and 24.8%, respectively for 10%BP. But at 600 o C, the compressive strength of mixes containing BP is higher than that of the control mix by 33% and 49.5% for 5% and 10%BP, and it had good resistance to water absorption at all temperature levels. A somewhat significant color change was noted for mortar compositions with higher BP ratios. A color change was observed from gray to pink for samples containing BP.

Keywords

Bentonite, Cement replacement, Compressive strength, Elevated temperature
Mass loss, Natural pozzolanic
Slump flow
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Al-Qadisiyah Journal for Engineering Sciences
Volume 18, Issue 1
Winter 2025
Pages 20-26

  • Receive Date 19 July 2023
  • Revise Date 02 May 2024
  • Accept Date 13 December 2024

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