한국도로학회논문집 제20권 제6호 (p.163-168)

상온 재활용 아스팔트 혼합물용 유화 아스팔트 유화제 특성 분석

Characterization of Emulsified Asphalt Emulsifier for Cold Recycling Asphalt Mixture
키워드 :
emulsifier,Emulsion Asphalt,Cold Recycling Asphalt Mixture,Dynamic Immersion Test,Tensile Strength Ratio

목차

ABSTRACT
1. 서론
2. 국내외 동향
3. 유화제 평가
  3.1. 유화제 함량 평가
  3.2. 유화 아스팔트의 실내 역학특성 분석
4. 유화제 종류별 수분저항성능 평가
  4.1. 동적수침시험 평가
  4.2. 인장강도비(TSR) 평가
5. 결론
REFERENCES

초록

PURPOSES : The purpose of this study is to examine the manufacturing method for emulsified asphalt and its bond performance by analyzing the properties of the emulsifier used to produce cold recycled asphalt mixtures.
METHODS: In this study, four types of slow-setting cationic emulsifiers, a microsurfacing emulsifier, and six types of nonionic emulsifiers were used to manufacture emulsified asphalt. Because each emulsifier requires its own unique effective dose to provide the best performance, the optimum asphalt content for each effective dose was determined. Then, the optimum asphalt content for the emulsified asphalt mixture was determined by the tests to check its basic physical properties. By using the determined optimum content, asphalt mixtures were manufactured and dynamic immersion and tensile strength tests were conducted on the mixtures to analyze the influence of the emulsifier on the physical properties of the mixtures.
RESULTS : The dynamic immersion test results showed a coating ratio of 54-85%, which is considerably higher than that of using ordinary straight asphalt. The tensile strength test yielded noncompliant values less than 0.4 N/mm, which is the standard requirement for dry indirect tensile strength. The correlation analysis between the dynamic immersion and tensile strength ratio tests showed very high correlation of 0.78. The correlation between the emulsifier content and water resistance performance was low, between -0.55 and -0.24.
CONCLUSIONS : While the storage stability improves with increasing emulsifier, the effectiveness proportional to the increase is weaker as the emulsifier increases. The performance testing of asphalt residues before and after manufacturing the emulsified asphalt showed no significant change. It is proved that the emulsified asphalt maintains high coating resistance according to the dynamic immersion test results. In addition, according to the results of tensile strength ratio, cold recycled asphalt mixtures manufactured by the materials normally and commercially used are not compliant with the national standard specification; thus, additional effective materials will be needed for quality compliance. In conclusion, it is evident that the dynamic immersion and tensile strength ratio tests have good correlation, but the quantity of emulsifiers used is not related to the level of moisture resistance.