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Polypropylene fiber is a synthetic material widely used in the construction industry for reinforcing concrete and other building materials. It is a thermoplastic polymer made from the polymerization of propylene, a byproduct of petroleum refining. Polypropylene fibers are lightweight, durable, and resistant to a variety of chemicals, making them ideal for construction applications.
### Key Features and Benefits:
1. **High Strength and Durability:** Polypropylene fibers enhance the tensile strength and durability of concrete, reducing the likelihood of cracking and improving the overall structural integrity.
2. **Chemical Resistance:** These fibers are resistant to most acids, alkalis, and chemicals, making them suitable for use in environments where exposure to corrosive substances is a concern.
3. **Lightweight:** The fibers are lightweight, which helps in reducing the overall weight of the construction materials without compromising strength.
4. **Water Resistance:** Polypropylene fibers are hydrophobic, meaning they do not absorb water. This property helps in preventing water ingress and damage in concrete structures.
5. **Thermal Stability:** They exhibit good thermal stability, which means they can withstand high temperatures without degrading.
6. **Ease of Use:** Polypropylene fibers can be easily mixed with concrete or other materials, making them convenient for a variety of construction applications.
7. **Cost-Effective:** Compared to other fiber reinforcement options, polypropylene fibers are relatively inexpensive, offering a cost-effective solution for enhancing material performance.
### Applications:
- **Concrete Reinforcement:** Used in slabs, pavements, bridges, and other concrete structures to minimize cracking and improve durability.
- **Plaster and Mortar:** Added to plaster and mortar mixes to enhance tensile strength and reduce shrinkage.
- **Shotcrete:** Employed in tunnel linings and other applications where spray-applied concrete is used.
- **Industrial Flooring:** Enhances the impact and abrasion resistance of industrial floors.
- **Geotextiles:** Utilized in erosion control, road construction, and soil stabilization projects.
Polypropylene fibers in construction provide an effective way to enhance the performance of materials, making them a popular choice for a wide range of projects.

1. Introduction Polypropylene fibre (PPF) is a kind of linear polymersynthetic fibre obtained from propylene polymerization. Ithas some advantages such as lightweight, high strength, high toughness, and corrosion resistance. ,e PPF is widely used in the chemical industry, energy, clothing, environmental protection, and construction [1–6]. In the construction industry, concrete has the disadvantages of low tensile strength, weak deformation resistance, and poor crack resistance. ,e microcracks are easily produced from the outside to the inside, which increases the permeability of concrete. Water or other harmful ions easily enter the interior of the concrete and accelerate the deterioration of concrete [7]. When PPF is added to concrete, the threedimensional random distribution network structure can be formed in concrete, which effectively inhibits microcrack generation and development [8–11]. As a result, the PPF can prevent water and other harmful ions from entering into concrete.,e durability of concrete can be improved by adding PPF[4, 12–14]. Due to its excellent properties, PPF can be used in architectural engineering, pavement engineering, and hydraulic engineering [7, 15–17]. In architectural engineering, the foundation construction of a high-rise building needs to be poured mass concrete at one time. ,e mass concrete is easy to produce thermal cracks at an early age[18, 19]. ,e PPF can effectively reduce the temperature cracks of the concrete [20]. Moreover, the resist-permeability of the concrete can be enhanced by adding PPFs due to fewer through cracks in the concrete [12, 21]. In pavement engineering, pavement often bears the impact load of vehicles, which requires good toughness and crack resistance, especially pavement with large traffic volumes or heavy loading traffic [22, 23]. ,e PPF-reinforced concrete has better toughness than plain concrete [24, 25]. When PPF is used in concrete, the toughness of pavement can be significantly strengthened [7]. Meanwhile, fewer creaks reemerged under the impact load of vehicles, indicating that the durability of pavement is enhanced by using PPFs in concrete [26, 27]. Hydraulic engineering, such as the bridge.