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Study on Improving the Properties of Alkali-Activated Materials by Using Corncob Ash
Zhonghao Li1, Xinyan Wang1, Shu Wang1
1College of Civil Engineering & Architecture, Qingdao Agricultural University, Shandong, Qingdao 266109, China.
ACS Omega
|May 5, 2025
Summary
Corncob ash (CA) enhances alkali-activated mortar (AAM) properties, improving mechanical strength and reducing shrinkage. This agricultural byproduct offers a sustainable biomaterial for green construction, reducing carbon emissions.
Area of Science:
- Materials Science
- Civil Engineering
- Sustainable Construction
Background:
- Agricultural byproducts like corncob ash (CA) are underutilized.
- Alkali-activated materials (AAM) offer a sustainable alternative to traditional cement.
- Investigating CA's impact on AAM is crucial for developing eco-friendly building materials.
Purpose of the Study:
- To evaluate the effects of incorporating corncob ash (CA) into alkali-activated materials (AAM).
- To analyze changes in mechanical properties, shrinkage, setting time, and microstructure.
- To assess the potential of CA as a biomaterial for sustainable construction.
Main Methods:
- Corncob ash (CA) was blended with alkali-activated mortar (AAM).
- Mechanical properties (compressive and flexural strength) were tested.
- Linear shrinkage and setting times were measured.
- Microstructural analysis was performed.
Main Results:
- CA incorporation significantly improved mechanical strength, reaching 60.1 MPa (compressive) and 8.9 MPa (flexural) at 28 days.
- AAM with CA showed reduced linear shrinkage by 14.5% and 13.4% at 56 and 60 days.
- Setting times were influenced by CA content and alkali concentration.
- CA's porous structure and carbon sequestration capacity contribute to reduced emissions.
Conclusions:
- Corncob ash (CA) is a viable biomaterial for enhancing alkali-activated materials (AAM).
- CA improves mechanical performance and durability while reducing shrinkage.
- The use of CA in AAM presents a sustainable pathway for green building construction with reduced carbon footprint.
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