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Comparison Of Fly Ash, Pva Fiber, Mgo And Shrinkage-Reducing Admixture On The Frost Resistance Of Face Slab Concrete Via Pore Structural And Fractal Analysis

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  • LEI WANG

    (College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, P. R. China†College of Urban Construction, Wuchang University of Technology, Wuhan, Hubei, P. R. China‡State Key Laboratory of Green Building Materials, Beijing, P. R. China)

  • FANXING GUO

    (College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, P. R. China)

  • HUAMEI YANG

    (��College of Urban Construction, Wuchang University of Technology, Wuhan, Hubei, P. R. China)

  • YAN WANG

    (College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi, P. R. China)

  • SHENGWEN TANG

    (�State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei, P. R. China)

Abstract

Face slab concrete suffers from serious frost damage in the cold regions in China. How to improve the frost resistance of face slab concrete in cold regions is one of the important issues in concrete-faced rockfill dam (CFRD) design and construction. The results in this paper indicate that the frost resistance of concrete can be improved by adding fly ash, fiber, MgO and shrinkage-reducing admixtures (SRAs), and their efficiencies are in the following sequence: (fly ash + fiber) > fiber > fly ash > MgO > SRA. The incorporation of 0.8kg/m3 polyvinyl alcohol (PVA) fiber and 20wt.% fly ash together enhances the compressive strength and tensile capacity of concrete by 6–7% at the late age, whereas the addition of 6wt.% MgO or 1wt.% SRA reduces the compressive strength and tensile capacity by about 4–10% at various ages. The Ds of concrete added with fly ash, fiber, MgO and SRA is within the range of 2.619–2.796. The frost resistance of concrete correlates linearly with the air void parameters, pore structures and Ds. The utilization of fly ash and/or PVA fiber refines and optimizes the pore structure, thus increasing Ds and improving the frost resistance. On the contrary, MgO and SRA in this study are less effective in refining the pores than PVA fiber and fly ash, thereby producing smaller Ds and relatively weaker frost resistance.

Suggested Citation

  • Lei Wang & Fanxing Guo & Huamei Yang & Yan Wang & Shengwen Tang, 2021. "Comparison Of Fly Ash, Pva Fiber, Mgo And Shrinkage-Reducing Admixture On The Frost Resistance Of Face Slab Concrete Via Pore Structural And Fractal Analysis," FRACTALS (fractals), World Scientific Publishing Co. Pte. Ltd., vol. 29(02), pages 1-18, March.
    • Handle: RePEc:wsi:fracta:v:29:y:2021:i:02:n:s0218348x21400028
    DOI: 10.1142/S0218348X21400028
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    Cited by:

    1. Noor Md. Sadiqul Hasan & Nur Mohammad Nazmus Shaurdho & Md. Habibur Rahman Sobuz & Md. Montaseer Meraz & Md. Abdul Basit & Suvash Chandra Paul & Md Jihad Miah, 2023. "Rheological, Mechanical, and Micro-Structural Property Assessment of Eco-Friendly Concrete Reinforced with Waste Areca Nut Husk Fiber," Sustainability, MDPI, vol. 15(19), pages 1-29, September.
    2. Muhammad Talha Amir & Sobia Riaz & Hawreen Ahmed & Syed Safdar Raza & Ahmed Ali A. Shohan & Saleh Alsulamy, 2023. "Synergistic Effect of Micro-Silica and Recycled Tyre Steel Fiber on the Properties of High-Performance Recycled Aggregate Concrete," Sustainability, MDPI, vol. 15(11), pages 1-16, May.
    3. Phermphorn Buathong & Thanakorn Chompoorat & Pornkasem Jongpradist & Xiaobin Chen & Pitthaya Jamsawang, 2023. "Effect of Palm Fiber Reinforcement on the Unconfined Compressive Performance of Cement-Treated Sand," Sustainability, MDPI, vol. 15(11), pages 1-16, May.

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