AlSaffar, D., Al-Shathr, B., Abed, S. (2023). Dynamic Characterization Assessment and Optimization of Reactive Powder Underwater Concrete. , 41(11), 1414-1431. doi: 10.30684/etj.2023.143193.1566
Doha M. AlSaffar; Basil S. Al-Shathr; Suhair K. Abed. "Dynamic Characterization Assessment and Optimization of Reactive Powder Underwater Concrete". , 41, 11, 2023, 1414-1431. doi: 10.30684/etj.2023.143193.1566
AlSaffar, D., Al-Shathr, B., Abed, S. (2023). 'Dynamic Characterization Assessment and Optimization of Reactive Powder Underwater Concrete', , 41(11), pp. 1414-1431. doi: 10.30684/etj.2023.143193.1566
AlSaffar, D., Al-Shathr, B., Abed, S. Dynamic Characterization Assessment and Optimization of Reactive Powder Underwater Concrete. , 2023; 41(11): 1414-1431. doi: 10.30684/etj.2023.143193.1566

Dynamic Characterization Assessment and Optimization of Reactive Powder Underwater Concrete

Engineering and Technology Journal
Volume 41, Issue 11, November 2023, Pages 1414-1431    PDF (1.79 M)
Document Type: Research Paper
DOI: 10.30684/etj.2023.143193.1566
Authors
Doha M. AlSaffar* 1; Basil S. Al-Shathr2; Suhair K. Abed3
1Civil Engineering Dept., Al- Iraqia University, Baghdad, 10053, Iraq.
2Civil Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.
3Ministry of Construction, Housing, Municipalities and Public Works, Building Research directorate, Baghdad, 10011, Iraq.
Abstract
This study investigates the dynamic properties of Reactive Powder Underwater Concrete (RPUWC), a novel composite integrating attributes of Reactive Powder Concrete and underwater cast concrete. The study focuses on assessing the impact resistance, dynamic modulus of elasticity, rigidity, and Poisson's ratio. The influence of micro steel fibers (MS) at different volume fractions (1%, 1.25%, and 1.5%) and different anti-washout admixture (AWA) dosages (0.5 %, 0.7%, and 0.9%) are examined. The findings indicate that increasing the MS content improves crack resistance and energy absorption, resulting in a substantial 155.6% enhancement in the first crack resistance when using 1.5% MS. Additionally, ultimate resistance improves by 158%. Furthermore, there are significant increases in the dynamic and modulus of rigidity as the MS percentage rises. The impact of AWA is rather limited, with a reduction in the dynamic modulus of 18.3% for 0.7% AWA and 30% for 0.9% AWA. Likewise, the modulus of rigidity decreases by 13% for 0.7% AWA and 23.9% for 0.9% AWA. Moreover, strong positive correlations between non-destructive testing (NDT) and ASTM C 215 equations are observed. This investigation addresses a significant knowledge gap, shedding light on optimizing underwater structures' performance by comprehending their dynamic response under varied MS and AWA ratios.

Highlights
  • AWA promotes fiber distribution within the concrete mix
  • AWA molecules' bonding could promot fiber's impact on dynamics characterization.
  • Increasing microsteel fiber (MS) content from 1% to 1.5% significantly enhances impact resistance
Keywords
Dynamic modulus of elasticity Impact resistance Underwater construction Non; dispersive concrete Anti; washout admixture
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