During the COVID-19 pandemic, it is essential to adhere to health protocols, one of which includes the use of a disposable mask for personal protection. However, the widespread use of single-use masks has resulted in a new problem, which is the accumulation of mask waste. Therefore, it is necessary to find a solution to reduce the amount of mask waste. One innovative solution to this problem is the utilization of masks in the infrastructure sector. Masks made of polypropylene are advantageous as they act as a good binder. By incorporating an appropriate percentage of mask waste, it is possible to produce bitumen with good parameters. This study aims to evaluate the stability and flow parameters of bitumen mixtures by substituting bitumen with 3-ply disposable mask waste. Experimental testing was conducted by replacing bitumen with mask waste at percentages of 0.5%, 0.75%, 1%, 1.5%, and 2%. The hot mix method was used to mix asphalt with the waste masks at a temperature of 150oC. Sensitivity analysis was performed to determine the impact of the percentage of mask waste on the stability and flow assessment parameters using the Marshall Test. The results of this study indicate that an increase in the percentage of mask waste leads to a sensitive response in the stability and flow values. The optimum percentage of mask waste for the mixture was found to be 1.50%, resulting in stability and flow values of 1020.36 kg and 4 mm, respectively.

The increasing population is definitely in line with the rising demand for housing. One area with many residents is Tangerang Regency, Banten with a population growth rate of 5,85% per year. PT. Summarecon Agung Tbk. becomes one of the developers of an integrated area in Tangerang Regency in fulfilling housing’s need. However, the wider the development of an area, it is parallel with the changes in land cover that significantly impact surface runoff. Therefore, this study aims to determine the surface runoff in the Summarecon Serpong area. The research method used is the Secondary Data Analysis (SDA) approach which requires several data; rainfall, land cover, and soil type. These data were then processed using Frequency Analysis to obtain design rainfall and continued to the SCS-CN Method to obtain surface runoff with the return period at 2 years, 5 years, 10 years, 20 years, and 100 years. The land cover in the Summarecon Serpong area was dominated by buildings, with the Hydrologic Soil Groups (KHT) in the form of Groups C and D. The calculation of the Composite Curve Number (CNk) value based on land cover and Hydrologic Soil Groups were 88,89, while the calculation of direct runoff using the SCS CN Method with a return period of 2 years, 5 years, 10 years, 20 years, and 100 years respectively were 77 mm, 121 mm, 154 mm, 188 mm, and 275 mm. The lowest surface runoff occurred on land cover in the form of green open land with Hydrologic Soil Group C, and the highest surface runoff occurred on land cover in the form of water bodies. This analysis indicates that focusing on the green open land in the Summarecon Serpong area can reduce surface runoff while increasing infiltration to maintain the sustainability hydrologic system.