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  11. Experimental Study On The Coupling Of Freeze-thaw Cycle And Chloride Corrosion Of Alkali Slag Cementitious Materials

Experimental Study on the Coupling of Freeze-Thaw Cycle and Chloride Corrosion of Alkali Slag Cementitious Materials

Jing Zhu1, Zhiming Li1, Ying Huang2

  • 1College of Civil Engineering and Architecture, Harbin University of Science and Technology, Harbin 150080, China.

Polymers
|June 13, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Alkali-activated-slag cementitious material (AASCM) modified with recycled rubber, coal ash, and straw fiber shows improved resistance to freeze-thaw and chloride corrosion. These enhancements are crucial for cold region construction applications.

Area of Science:

  • Materials Science
  • Civil Engineering
  • Sustainable Construction

Background:

  • Alkali-activated-slag cementitious material (AASCM) offers environmental and mechanical benefits but suffers from cracking and poor frost resistance.
  • Cold region construction demands materials with enhanced durability against freeze-thaw cycles and corrosive environments.

Purpose of the Study:

  • To investigate modifications of AASCM for improved performance in cold climates.
  • To evaluate the resistance of modified AASCM to coupled freeze-thaw cycles and chloride ion corrosion.

Main Methods:

  • Coupled freeze-thaw cycle and chloride ion corrosion tests were performed on AASCM specimens.
  • Specimens incorporated recycled rubber, coal ash, and straw fiber.
  • Mass loss, compressive strength, and morphological changes were analyzed.
Keywords:
alkali-activated-slag cementitious materialchloride corrosioncoupling testfreeze-thaw cycle

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Main Results:

  • AASCM with recycled rubber and coal ash showed <5% mass loss and <25% strength loss after 100 freeze-thaw cycles.
  • AASCM with recycled rubber, coal ash, and straw fiber exhibited <25% mass loss after 100 coupled freeze-thaw and chloride tests.
  • Microscopic analysis confirmed a dense C-A-S-H gel structure, indicating material stability.

Conclusions:

  • Recycled rubber enhances AASCM flexibility and frost resistance by mitigating crack propagation.
  • Straw fibers further inhibit crack growth, while coal ash promotes C-A-S-H gel formation, boosting mechanical properties.
  • Modified AASCM demonstrates significant potential for durable construction in cold and corrosive environments.
recycled rubber