한국도로학회논문집 제22권 제1호 (p.77-86)

콘크리트 도로시설물용 보수재료로서 유무기계 하이브리드 모르타르의 내화학성 평가

Resistance to Chemical Attack of Combined Organic and Inorganic Hybrid Mortars as Repair Materials for Concrete Road Facilities
키워드 :
Combined Organic and Inorganic Hybrid Mortar,Repair Materials,Concrete Road Facilities,Chemical attack,Microstructure

목차

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

초록

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.