Experimental evaluation on engineering properties and microstructure of the high-performance fiber-reinforced mortar with low polypropylene fiber content

  • Vu Viet Hung

    Campus in Ho Chi Minh City, University of Transport and Communications, No. 450 - 451 Le Van Viet Street, Tang Nhon Phu A Ward, Thu Duc, Ho Chi Minh City, Vietnam
  • Nguyen Tuan Cuong

    Campus in Ho Chi Minh City, University of Transport and Communications, No. 450 - 451 Le Van Viet Street, Tang Nhon Phu A Ward, Thu Duc, Ho Chi Minh City, Vietnam
  • Nguyen Huu Duy

    Campus in Ho Chi Minh City, University of Transport and Communications, No. 450 - 451 Le Van Viet Street, Tang Nhon Phu A Ward, Thu Duc, Ho Chi Minh City, Vietnam
  • Ngo Nguyen Ngoc Tho

    Graduate student, School of Graduate, Can Tho University, Campus II, 3/2 St., Ninh Kieu Dist., Can Tho City, Vietnam
  • Huynh Trong Phuoc

    Department of Civil Engineering, College of Engineering Technology, Can Tho University, Campus II, 3/2 St., Ninh Kieu Dist., Can Tho City, Vietnam
Email: htphuoc@ctu.edu.vn
Từ khóa: high-performance fiber-reinforced mortar, engineered cementitious composite, drying shrinkage, mechanical strength, microstructure.

Tóm tắt

Recently, high-performance fiber-reinforced mortar/concrete (HPFRM) has been researched and developed in many fields such as repair, maintenance, and new construction of infrastructure works due to its high strain capacity and tight crack width characteristics. Optimizing the design of mixture proportions and structures using HPFRM is still a complex mechanical and physical process, depending on the design principles, specific site conditions, and their local materials. This study aims to develop an HPFRM with low polypropylene fiber content by using locally available ingredients in Southern Vietnam to address the deficiencies commonly observed in traditional cement grout mortars. Three mixture proportions were prepared with different water-to-binder (w/b) ratios of 0.2, 0.25, and 0.3. Then, the performance of HPFRM was evaluated in both fresh and hardened stages. Additionally, the microstructural characteristics of each mix design were also assessed through scanning electron microscope observation. The experimental results showed that the optimum w/b of 0.25 and a fixed dosage of 0.6% polypropylene fiber produced positive impacts on the rheological, mechanical properties, and also ductility of the high-performance mortar. It was concluded that HPFRMs are promising for cost-effective and sustainable cement mortars.

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