Pavements have historically been used for mobility, but their usage in cities is steadily increasing owing to social and cultural development. Urban development is rapidly accelerating, primarily because of the concentration of the urban population. Additionally, the effects of the urban heat island are intensifying owing to global warming. One of the main factors contributing to this phenomenon is the increase in impermeable layers, such as asphalt and concrete pavements, in city centers. Various technological developments have been conducted to reduce the effects of urban heat islands. This study developed a moisture-retaining asphalt that absorbs moisture by incorporating a highly super-absorbent polymer (SAP) into a porous asphalt mixture, with the aim of alleviating the urban-heat-island effect. The porous asphalt mixture was designed accordingly. When the mixing design was completed, tests for the tensile strength ratio (TSR), asphalt wheel tracking, and indoor water permeability were conducted on the porous asphalt. Moreover, Hamburg wheel tracking and dynamic water acupuncture tests were performed to evaluate the compatibility of SAP moisture-retaining asphalt, and the results were as follows: Depending on the type and content of SAP, we confirmed that the TSR and permeability coefficient decreased as the amount of SAP increased, resulting in a decrease in durability. In addition, thermal characteristics and simulations showed that the SAP asphalt mixture would have a heat island reduction effect. In this paper, guidelines for the blending design of SAP moisture-retaining asphalt are presented with the aim of alleviating the urban heat island phenomenon by ensuring durability while simultaneously reducing surface temperatures.

ABSTRACT
Introductuon
OBJECTIVES
MIX DESIGN AND CHARACTERIZATIONOF SAP ASPHALT MIXTURE
Metarials
    Evaluation of SAP Asphalt Properties by Typeand Content
    Moisture-retaining Asphalt Mix Design accordingto SAP Retention Capacity
THERMAL PROPERTIES OF MOISTURERETAININGASPHALT MIXTURE
    Change in Surface Temperature after Sprayingaccording to SAP Type and Content
    Simulation of Moisture-retaining Asphalt Pavement
CONCLUSIONS
REFERENCES

• Dae-Seong Jang(Dept. of Civil Engineering, Jeonbuk National University) | 장대성
• Chi-Su Lim(Dept. of Civil Engineering, Jeonbuk National University) | 임치수
• Jae-Jun Lee(Dept. of Civil Engineering, Jeonbuk National University) | 이재준
• Cheolmin Baek(Dept. of Highway&Transportation, Korea Institute of Civil Engineering and Building Technology) | 백철민 Corresponding author