한국도로학회논문집 제20권 제6호 (p.163-168)

상온 재활용 아스팔트 혼합물의 초기 상온양생 강도 발현을 위한 무기질 재료 반응특성 분석

Analysis on inorganic material reactivity for initial strength development of cold recycled asphalt mixture at room temperature
키워드 :
Cold Recycled Asphalt Mixture,Inorganic material,Energy Dispersive X-ray System,Emulsion Reactivity test,Initial strength

목차

ABSTRACT
1. 서론
2. 재료 및 배합설계
  2.1. 선정한 유화아스팔트 및 순환골재 재료특성
3. 상온 재활용 혼합물 평가를 위한 배합설계
4. 초기강도 발현을 위한 무기질 합성 첨가비율결정
5. 무기질 재료 비율에 따른 초기양생 및 완전양생 강도 비교
6. 결론
REFERENCES

초록

PURPOSES: The object of this study is to select appropriate inorganic materials, and find the best mixing formula to secure fast curing time and enough initial strength, and then to evaluate the durability of the asphalt mixtures according to the degree of addition of the compound manufactured by the determined blending ratio.
METHODS : The breaking time and reactivity between seven kinds of inorganic minerals, and the selected recycled aggregate and emulsified asphalt were compared to determine the best initial curing strength for the mixtures. Then, three inorganic materials were chosen as the materials that provide good breaking time and reactivity, and the best mixing formula for the three materials was determined. The chemical composition of the compound manufactured using the mixing formula was analyzed by energy dispersive x-ray system method. Finally, indirect tensile strength (ITS) test was performed (for two days) at room temperature to determine the proper amount of additives that will provide the best initial strength.
RESULTS: From the results of the reactivity test, the best mixing formula (A:C:G = 60:30:10) for the three selected inorganic materials with short braking time and high reactivity was determined. The four types of cold reclaimed asphalt mixtures for ITS testing were manufactured by adding the inorganic material compounds at 0%, 3%, 5%, and 7%, and the ITS values were measured after two curing days. The ITS values at 5% and 7% were 0.308 MPa and 0.415 MPa, respectively. The results of quality control tests (Marshall stability, porosity, flow value, etc.) at 5% and 7% satisfied the specification criterion for the cold recycled asphalt mixtures.
CONCLUSIONS : The selected inorganic materials (A, C, and G) and the best mixing formula (A:C:G = 60:30:10) accelerated the reaction with emulsified asphalt and shortened the curing time. Depending on the inorganic material used, the breaking time and reactivity can be directly related or unrelated. This is because of the chemical compositions of recycled aggregates, infiltrated foreign matter, and chemical reactions between the inorganic materials and other materials. Therefore, it is important to select the proper materials and the best mixing formula when evaluating the characteristics of the practically used materials such as recycled aggregates, inorganic materials, and emulsified asphalt.