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Dynamic properties of mortar with oyster shell sand replacement
Yanling Lin1,2,3, Yuzhe Ren2,3, Tiange Ge2,3
1School of Construction Engineering, Jiangsu Open University, No.399 North Jiangdong Road, Nanjing, China.
Scientific Reports
|November 18, 2024
Summary
Using waste oyster shells as a partial replacement for sand in mortar initially improves strength and energy absorption. However, exceeding 20% oyster shell sand (OSS) significantly reduces mortar
Area of Science:
- Civil Engineering
- Materials Science
- Sustainable Construction
Background:
- Construction demands for natural sand cause ecological damage.
- Waste oyster shells offer a sustainable alternative aggregate.
- Dynamic properties of oyster shell sand (OSS) mortar are under-researched.
Purpose of the Study:
- Investigate the dynamic mechanical properties of mortar using crushed oyster shell sand (OSS) as a fine aggregate replacement.
- Determine the optimal replacement ratio for enhanced performance.
- Establish predictive models for dynamic properties.
Main Methods:
- Split Hopkinson Pressure Bar (SHPB) tests were conducted.
- Mortar samples with varying OSS replacement ratios (0-100%) were tested.
- Dynamic properties like peak stress and elastic modulus were analyzed under different pressures.
Main Results:
- Peak stress and elastic modulus increased up to 20% OSS replacement due to a filling effect.
- Higher OSS ratios (>20%) led to decreased strength and elastic modulus because of porosity.
- Energy absorption and impact resistance declined with increased OSS content.
Conclusions:
- A 20% replacement of natural sand with OSS shows potential for improving mortar's dynamic properties.
- Excessive OSS content negatively impacts mortar's mechanical integrity and impact resistance.
- This research provides a basis for using OSS in construction, considering its dynamic performance limitations.
Keywords:
Absorbed energyElastic modulusOyster shell sandPeak stressSplit Hopkinson pressure bar (SHPB) testsStrength contribution rate.More Related Videos
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