Recently, a great social damage has been caused by the sargassum homeri, which has flowed from China in the Jeju and Namhae coasts. In this study, biopolymer was prepared by using sargassum homeri and applied to bridge pavement concrete. The performance of chloride ion penetration resistance of the bridge pavement concrete made of biopolymer was evaluated. As a result, excellent penetration resistance performance was shown.

최근 남해안과 제주도 연안에는 5,000톤 이상의 괭생이 모자반이 유입되어 양식장과 조업에 큰 피해를 주고 있으며, 환경훼손 등 사회적 문제로 부각되고 있다. 괭생이 모자반에 존재하는 알긴산은 주로 의약품, 식품 등으로 활용되는 천연 고분자 물질이다. 하지만, 대량으로 활용할 수 있는 수요처가 확보되지 않아 본 연구에서는 괭생이 모자반을 활용한 바이오 폴리머를 구조물 보수용 폴리머 모르타르에 활용하기 위한 연구를 수행하였다. 응결특성 평가 시험에서는 바이오 폴리머가 12% 혼입된 L0BP12 배합은 합성폴리머만 혼입된 L12BP0 배합보다 종결시간이 최대 20%증가하는 것을 확인하였다. 흡수율 시험에서는 LOBP12 배합이 초속경 시멘트 배합인 Plain-URHC보다 0.36% 감소하는 것으로 나타나 바이오 폴리머 혼입으로 모르타르의 수밀성이 증가하는 것을 확인하였다. 압축 및 휨강도 시험에서는 바이오 폴리머의 혼입이 증가할수록 강도가 감소하는 경향을 나타내었고, KS F 4042 기준을 만족하는 최대 바이오 폴리머의 혼입률은 12%로 결정되었다. 또한, 재령 4시간 기준 부착강도는 Plain-URHC시험체 보다 모두 향상되었으며, 1 MPa 이상을 확보하여 바이오 폴리머의 혼입이 모르타르의 부착강도를 향상 시킬 수 있는 것을 확인하였다.

Resently, sargassum honeri, which has flown into the Korean coast, has become a serious problem due to the serious damage to domestic aquaculture and fishery. The purpose of this study is to utilize sargassum honeri containing alginic acid as a natural polymer material in cement mortar for repairing structures. The experimental results show that the flow of mortar tends to decrease as the incorporation rate of biopolymer increases.

In this study, the setting times of mortar using the biopolymer in seaweed was evaluated by penetration resistance. The evaluation was based on the method presented in KS F 2436. Test results show that the biopolymer was used instead of the synthetic polymer, the termination time was delayed.

In this study, presents the mechanical bond strength properties of mortar using bio polymer in seaweed. The evaluation was based on the method presented in KS F 2762. It was confirmed that the resistance performance all levels of biopolymer using mortar excellent performance with bond strength over 1.0 MPa as defined in KS F 4042 『Polymer-cement mortar for Concrete Structures』.

In this study, cement mortar (KS F4041) used for surface of floor was evaluated for durability of abrasion according to the mixing ratio of polymer. From the experimental results, it was confirmed that as the polymer content increases, the durability of abrasion properties increase.

In this study, dry shrinkage was evaluated by adding limestone powder according to the substitution ratio to Engineered Cementitious Composite. The test method was carried out by KS F 2424, and it was confirmed that the drying shrinkage tends to increase slightly as the substitution ratio of the limestone fine powder increases.

최근 유통·물류 산업의 발달로 산업용 창고 바닥의 중요성a이 점점 높아지고 있다. 본 연구에서는 기존의 바닥재료로 사용되어 온 일반 시멘트계 모르타르가 가지고 있는 유동성의 한계 및 긴 양생 시간 등의 단점을 보완할 수 있는 속경성 폴리머 모르타르 바닥소재를 개발하 였다. 속경성 확보를 위해 초속경 시멘트를 결합재로 사용하였고, VAE 폴리머 분말수지를 5%~20% 혼입 범위로 설정한 4종류의 배합과 혼입 하지 않은 Proto배합에 대한 기초물성을 유동성실험, 압축강도실험, 휨강도실험, 부착강도실험 및 마모실험을 통해 평가하였다. 유동성 실험 결과를 통해 고성능 감수제량를 조절함으로써 플로우 250 mm 이상의 고유동 특성을 확보할 수 있었다. VAE 폴리머 혼입은 압축강도 감소에 영향을 미치는 것으로 나타났지만 휨강도는 Proto배합에 비해 우수하게 증진시킬 수 있어 압축강도/휨강도비를 증가시키는 것으로 평가되었 다. 또한 최소 2.6배 이상의 부착강도 향상과 4배 이상의 마모저항성을 확보할 수 있었다. 역학적 실험을 통해 VAE 폴리머 최적 혼입률을 10% 로 결정하였고, 현장적용 및 모니터링을 수행한 결과 VAE 폴리머를 혼입하지 않은 바닥재에 비해 오염도, 충격에 의한 저항, 부착성능 등이 우 수한 것으로 나타났다.

From the test results, it was found that the compressive strength and the resistance of chloride ion penetration were evaluated the slag content of the concrete for bridge pavement. Compressive strength test results showed that initial strength was decreased as slag replacement ratio increased. The chlorine ion penetration performance increased with increasing strength.

In this study, cement mortar (KS F 4042) used for repairing concrete structures was evaluated for compressive strength and bond strength according to the mixing ratio of polymer. From the experimental results, it was confirmed that as the polymer content increases, the bond strength properties increase, but the compressive strength decreases slightly at a certain rate.

From the test results, it was found that the compressive strength and the resistance of chloride ion penetration were evaluated the slag content of the concrete for bridge pavement. Compressive strength test results showed that initial strength was decreased as slag replacement ratio increased. The chlorine ion penetration performance increased with increasing strength.

In this study, cement mortar (KS F 4042) used for repairing concrete structures was evaluated for compressive strength and bond strength according to the mixing ratio of polymer. From the experimental results, it was confirmed that as the polymer content increases, the bond strength properties increase, but the compressive strength decreases slightly at a certain rate.