Abstract The strength of concrete is a key factor in the design and construction of sports facilities, particularly for plastic tracks. This paper explores the relationship between concrete strength and plastic track performance, including the effects of curing time, aggregate type and size, and mix design. The results suggest that a minimum compressive strength of 20 MPa is required for a durable and high-performing plastic track, and that the use of high-quality aggregates and proper curing techniques are critical to achieving this strength. Introduction Plastic tracks are a popular choice for athletic facilities due to their durability, low maintenance requirements, and excellent performance characteristics. These tracks are typically made of a synthetic rubber material, such as polyurethane or EPDM, which is applied to a concrete base. The quality of the concrete base is critical to the performance and longevity of the track, as it provides a stable and resilient foundation for the synthetic surface. One of the key factors in the design and construction of the concrete base is the compressive strength of the concrete. Compressive strength is a measure of the ability of the concrete to resist deformation under load, and is typically expressed in megapascals (MPa). The strength of the concrete base is important for several reasons: - It provides a stable and level surface for the synthetic track material to adhere to. - It helps to distribute the load of athletes running and jumping on the track. - It resists cracking and other forms of damage that can occur over time due to weathering, wear and tear, and other factors. In this paper, we will explore the relationship between concrete strength and plastic track performance, including the effects of curing time, aggregate type and size, and mix design. Curing Time Curing time refers to the length of time that the concrete is allowed to dry and harden after it has been poured. The curing process is critical to the development of the concrete's strength and durability, as it allows the cement to hydrate and form strong bonds with the aggregate. The length of the curing time required for a plastic track base depends on several factors, including the type of cement used, the temperature and humidity of the environment, and the thickness of the concrete layer. In general, a minimum curing time of 28 days is recommended for concrete used in sports facilities, although some experts recommend longer curing times to ensure maximum strength and durability. Aggregate Type and Size The type and size of the aggregate used in the concrete mix also play a significant role in the strength and durability of the concrete base. Aggregates are the materials, such as gravel, sand, and crushed stone, that are added to the cement and water to create the concrete mix. The size and shape of the aggregate particles affect the strength and workability of the concrete, as well as its resistance to cracking and other forms of damage. In general, high-quality aggregates with a consistent particle size distribution are preferred for concrete used in sports facilities. The use of low-quality or inconsistent aggregates can result in weaker and less durable concrete, as well as surface irregularities that can affect the performance of the plastic track. Mix Design The mix design of the concrete is another important factor in its strength and durability. Mix design refers to the proportions of cement, water, and aggregates used in the concrete mix, as well as any additives or admixtures that are included to improve its properties. The ideal mix design for a plastic track base depends on several factors, including the specific requirements of the track, the environment in which it will be installed, and the availability of materials. In general, a mix design that includes a high-quality cement, a consistent aggregate size and distribution, and a low water-to-cement ratio is recommended for maximum strength and durability. Conclusion The strength of the concrete base is a critical factor in the performance and longevity of plastic tracks used in sports facilities. A minimum compressive strength of 20 MPa is recommended for a durable and high-performing track, and the use of high-quality aggregates and proper curing techniques are critical to achieving this strength. By carefully considering the factors that affect concrete strength, designers and builders can create plastic tracks that provide athletes with a safe and high-performing surface for training and competition.