PURPOSES: This study aims to evaluate the resistance to chemical attack of combined organic and inorganic hybrid mortars as the repair materials (i.e., HRM mortar) used for concrete road facilities through a comparison with mortars made from cement repair materials (i.e., IRM mortar).
METHODS: Inorganic materials used as a binder and two mineral fillers were adopted to produce HRM mortars. The ratio of the main resin versus the hardener was fixed at 2:1. For comparison, IRM mortars made of cement repair materials were also manufactured. The mortars were exposed to chemical solutions, such as NaCl, MgSO4, Na2SO4, and H2SO4, with the same concentration of 5% after 7 days of curing. The compressive strength, compressive strength loss, mass ratio, and relative bulk density of the mortar samples exposed to the chemical solutions were measured at predetermined periods. In addition, a scanning electron microscope observation was performed to evaluate the microstructures and the products formed by the chemical reaction of the mortar samples.
RESULTS : As a result, the resistance to chemical attack of the HRM mortars was found to be much better than that of the IRM mortars, regardless of the types of attacking sources. This finding implies that HRM is a highly promising and versatile material because of its excellent resistance to chemical attack.
CONCLUSIONS: The application of the combined organic and inorganic hybrid mortars is a possible option for repair of concrete road facilities exposed to aggressive environments.

ABSTRACT
1. 연구배경 및 목적
2. 실험개요
    2.1. 사용재료
    2.2. 배합 및 시험체 제작
    2.3. 시험용액 및 노출조건
    2.4. 실험방법
3. 실험결과 및 고찰
    3.1. 압축강도 변화
    3.2. 질량 변화
    3.3. 밀도 변화
    3.4. 미세구조 분석
4. 결론 및 요약
REFERENCES

• 이승태(군산대학교 토목공학과) | Lee Seung-Tae (Department of Civil Engineering, Kunsan National University) 교신저자