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Strength Prediction of Non-Sintered Hwangto-Substituted Concrete Using the Ultrasonic Velocity Method.
Hajun Im1, Wonchang Kim1, Hyeonggil Choi2
1Department of Fire and Disaster Prevention, Semyung University, Jecheon 27136, Republic of Korea.
Materials (Basel, Switzerland)
|January 11, 2024
Summary
This study explores using non-sintered Hwangto (NSH) as a cement substitute in concrete. Optimal NSH concrete properties were identified, with 15% replacement showing minimal deviation from plain concrete, and a predictive model for compressive strength was developed.
Area of Science:
- Civil Engineering
- Materials Science
- Sustainable Construction
Background:
- Traditional concrete production has significant environmental impacts.
- Exploring alternative, locally sourced materials like non-sintered Hwangto (NSH) is crucial for sustainable construction.
- Understanding the mechanical properties of NSH-modified concrete is essential for its practical application.
Purpose of the Study:
- To investigate the properties of concrete incorporating non-sintered Hwangto (NSH) as a partial cement replacement.
- To determine the optimal cement replacement ratio of NSH for concrete mixtures.
- To develop a predictive model for the compressive strength of NSH concrete (NSHC).
Main Methods:
- Concrete mixtures were prepared with varying NSH replacement rates (0%, 15%, 30%, 45%) and water-to-binder ratios (0.41, 0.33, 0.28).
- Mechanical properties including unit weight, compressive strength, ultrasonic pulse velocity (UPV), and stress-strain behavior were evaluated.
- Microstructural analysis using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) was performed.
- Regression analysis was used to develop a compressive strength prediction model based on UPV.
Main Results:
- Increasing NSH replacement led to reductions in unit weight (5.35%), compressive strength (35.62%), and UPV (6.34%).
- The 15% NSH replacement rate exhibited the smallest deviation in properties compared to plain concrete.
- SEM revealed increased amorphous structures and pores with higher NSH content, while XRD showed increased kaolinite and mullite peaks.
- A compressive strength prediction model using an exponential function was developed with an average error of <10%.
Conclusions:
- Non-sintered Hwangto can be used as a partial cement substitute in concrete, with 15% replacement being optimal for maintaining mechanical properties.
- The microstructural changes due to NSH incorporation affect the concrete's strength and durability.
- The developed predictive model offers a reliable method for estimating NSH concrete compressive strength, particularly at lower strength ranges.
Keywords:
compressive strengthmechanical propertiesmicrostructural analysisnon-sintered Hwangtoprediction modelregression analysisultrasonic pulse velocityMore Related Videos
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