# Study on Seepage Effect of Roadway Based on Polyformaldehyde(POM) Fiber Concrete
## 1 Introduction  
Among the widely used materials in civil engineering, concrete is valued for its durability, tensile strength, and versatility [1, 2]. Being moldable in different forms and sizes, it can find a wide variety of structural applications ranging from buildings and bridges to roadways [3, 4, 5]. In all its forms, plain concrete is, however, marred by intrinsic flaws, which have an adverse effect on its durability in the long term [6, 7]. In this regard, it is distinguished by its tensile weakness, making it susceptible to tensile cracking, poor crack resistance, and excessive permeability, which can lead to the seepage of water and reduced durability in adverse weather conditions [8, 9]. To mitigate such adversity due to the seepage of water, particularly in roadways and seepage areas, different methods have been proposed. Some of these methods include usinggeo-synthetic materials, drainage systems, and waterproofing membranes [10; 11; 12]. While such methods can reduce the seepage of water, each of these methods contains a drawback in relation to durability. Waterproofing membranes can degrade, geo-synthetic materials may not be locally compatible, and drainage systems may be obstructed [13; 14; 15]. Such drawbacks take us toward a more sustainable and effective solution for making roadways more resistant in such adverse circumstances. To this end, the use of polymeric materials, such as polyformaldehyde fibers, is highly advantageous in relation to traditional methods. The fibers provide a stronger and flexible solution by reinforcing concrete for the prevention of water infiltration, enhancing its functionality in the long term, and making it compatible with various environmental factors [16]. Our solution is not only addressing short-term issues of the seepage of water, but it is also advantageous in making road infrastructure more sustainable and longer-lasting. For the further enhanced functionality of concrete, various fibers have been added to concrete to improve its mechanical properties and durability [17]. The fibers used in concrete production, depending on the type of material, are usually classified as metal fibers, polymer fibers, ceramic fibers, or natural fibers, with each reinforcing fiber having its own advantages and disadvantages [18; 19]. The mechanical properties of fiber concrete have been studied, and steel, polypropylene, sisal, and polyformaldehydehyde (POM) fibers have been of interest due to their capability in enhancing concrete durability and mechanical properties. In a study, for example, steel fibers were analyzed for their contribution toward enhancing the mechanical properties of M30-grade concrete in terms of compressive and flexural strengths, using various contents of fibers. This study showed enhanced strengths, where fibers of 1% yielded a maximum compressive strength and 0.75% for flexural strength, emphasizing fibers' capability in enhancing concrete performance [20]. Several similar studies have been conducted on synthetic and natural fibers in concrete, such as polypropylene and sisal fibers. Sisal fibers showed a 6% increase in compressive strength and a 4% increase in tensile strength due to their hygroscopic nature, while polypropylene fibers showed similar properties relative to a reference concrete. Sisal fibers, although lowering workability compared to polypropylene, showed a more environmental-friendly alternative, balancing between workability and strength [21]. Additionally, in 2023, [PERSON] et al. conducted research on the durability of concrete influenced by polyformaldehyde (POM) fibers. The outcomes showed that polyformaldehyde fibers enhanced compressive strength, enhanced splitting tensile strength, narrowed down pore diameter, and lowered porosity, making concrete compactness greater and contributing toward enhanced impermeability, sulfate corrosion, and frost resistance, which make polyformaldehyde fiber a material of interest for durability [22]. [PERSON] et al.