In this research, We carried out compressive, chloride ion penetration and scaling, freezing-thawing test. These test will evaluate the durability of Waste Glass Powder(WG) and Sludge(WGS) concrete. In result, the compressive strength of containing WG, WGS increased rather than OPC in age 90 days. Also, resistance of chloride ion penetration and scaling, freezing-thawing confirmed excellent rather than OPC.

This study is the study of the chlorine ion penetration resistance of the study of the natural durability enhancement materials that can reduce cracking of the concrete. The durability enhancement materials of natural were substituted 10%, 20%, 30% of cement, the results were confirmed excellent chlorine ion penetration resistance as the more increasing the natural durability enhancement.

A portable device which calculate and analysis the SOC structure data. This device can be used to estimate the building prior to install the sensing system. This sensing tools can help the system engineers to analyze the large SOC structure’s responses.

건축물의 대표적인 구조는 철근콘크리트조와 철골조를 들 수 있으며, 이때 철골조는 화재발생시 철골이 고온에 노출되면 내력저하 현상이 발생하여 내화피복을 의무화하고 있다. 내화피복재는 내화뿜칠재와 내화도료로 크게 분류되며, 국내의 고층 건축물에서는 주로 내화뿜칠재를 사용하고 있으며, 국가에서 운영하는 내화구조인정제도에 의해 내화뿜칠재의 내화성능에 대한 인정 취득 후 사용하도록 하고 있다. 그러나, 내화구조 인정제도는 제품의 초기성능 평가에 중점을 두고 있어 내화뿜칠재의 장기적인 내구성에 대한 검토가 요구되어 왔으며, 미국의 세계무역센터 붕괴 최종보고서에서도 내구성 검토를 언급함에 따라 미국, 유럽 등에서는 2000년대 중반부터 내화뿜칠재에 대한 내구성 평가방법을 제정 및 사용하고 있는 반면 국내에서는 적절한 대응이 이루어지지 못하고 있는 실정이다. 이에 본 연구에서는 국내에서 내화뿜칠재의 90%이상이 업무용시설의 천장내에 시공되는 등 주로 옥내에서 사용되는 점에 착안하여 다양한 조건의 내구성 평가방법에 앞서 국내의 옥내 환경조건에 대응한 내화뿜칠재의 촉진내구성 평가방법을 정립하여 내화뿜칠재의 내구성 평가 및 기술개발에 활용함으로써 내구성 관련 기술을 향상시키는데 기여하고자 한다.

Environmental problems caused by the occurrence of carbon dioxide are recognized as a critical issue throughout the world. As a result, a measure for the use of cement and improvement of its quality must be sought out. In order to reduce the occurrence of carbon dioxide during the manufacturing process of cement, this study creates an alkali-activated slag cement that utilizes ground granulated blast furnace slag, an industrial by-product, and substitutes metakaolin as an alternative for silica fume to improve the process of manufacturing high-strength concrete and its quality. The study discerns the mechanical characteristics by measuring the flexibility and compressive strength through the mortar matrix and discerns the durability by conducting an acid resistance test and chloride ion penetration resistance test. Also, the study discerns the hydration products through an XRD test. Based on the results of such tests, it is anticipated that it may be used as a secondary product for concrete or buildings that require superior long-term strength and durability compared to regular Portland cement. However, as no clear results were found in this study regarding the substitution of metakaolin, it displayed mixed results in comparison to previous studies. Nevertheless, it is expected that metakaolin will become a more superior admixture if its issues are improved through continuous research studies.

본 고는 동절기 이후 무근 콘크리트의 상부에서 쉽게 발생하는 스케일링 현상에 주목하여 무근 콘크리트의 동해 발생원인을 고찰하고, 이에 대한 내구성을 향상시키기 위한 방안을 기존문헌조사를 통하여 1) 강도향상, 2) 진공배수공법 적용, 3) 흡수방지재 시공의 방법을 선정하였다. 그 후 각 방법의 동결융해저항성 향상 평가를 정량적으로 평가하기위하여 동결융해 시험을 통한 상대동탄성계수를 측정하였다. 그 결과 1), 2)번의 경우 동탄성계수가 약 15% 향상, 3)의 경우 강도에 따라 7~13%향상됨을 실험적으로 확인하였다. 따라서 상기의 방법 모두 무근 콘크리트의 동결융해 저항성 향상에 유효한 방법으로 판단되며, 이를 통해 무근콘크리트의 빈번히 발생하는 품질저하 및 이로인한 유지보수비용 절감을 도모할 수 있을 것으로 사료된다.

고속철 PSC 교량 마찰받침의 내구성 평가를 위하여 해당국내 기준의 미비로 DIN EN 1337-2 과 CUAP 기준을 적용하여 마찰판의 5000 m 이동거리에 대한 마찰 시험을 수행하였다. 적용온도와 이동속도에 따라 마찰계수를 계측하고 기준에서 요구된 상한 한계와 비교하여 고속 주행으로 발생하는 증가된 이동거리에 대한 적합한 내구성 평가기준과 실험방법을 개발하고자한다.

The purpose of this paper is to establish specifications and to make database for the construction of sea pools. Sea pools are faced with sea water including salts, so it will be used that high strength concrete, reinforced high strength and urethane for its construction. 3D-analysis by SAP2000 software is required for designing of sea pools in order to confirm its degradation of the concrete durability. This results show that the strength of concrete of 40MPa is the most suitable and 3m wave is more advantageous than that of 4m.

The objective of this paper is to investigate the effect of spreading time of waste cooking oil (WCO) on durability of high volume blast furnace slag concrete. Carbonation and resistance to chloride attack were measured according to spreading time of WCO. WCO was spreaded on the surface of the concrete with different curing condition after demolding. Blast furnace slag with 60% was incorporated into concrete with 45% of W/B. Test results indicated that carbonation and penetration resistance of chloride attack had favorable results with the condition of 28days water curing and spreading WCO.

The purpose of this study is to examine and quantify the effect of chloride content on surface electrical resistivity measurement of concrete. It was obvious that chloride content had influenced the resistivity of concrete and the relationship showed a linear function. That is, concrete with chloride ions had a comparatively lower resistivity. Decreasing rate of resistivity of concrete was clear at early time, however, after 50 days resistivity was constant irrespective of chloride concentration. Conclusively, this paper suggested the quantitive solution to depict the electrical resistivity of concrete with chloride content.

This study aims at evaluation of compressive strengths and coefficients of chloride ion diffusion in concrete specimens using plain, chemical admixture PNH deveoped for anti-chloride corrosion, commercially available product of B company and blast furnace of granuate slag(BSF). It is found throughout experiments that most cases of compressive strengths are almost similar except using BSF, but the PNH has the highest resistance against chloride attack.s

Durability and structural safety of steel structure are severely affected by corrosion caused by deicer material as well as by airborne chlorides in the marine environment. In this study, based on analysis of current status it is suggested that deterioration and durability reduction by the environmental factor such as chlorides should be more reasonably taken into consideration for the accurate inspection and condition evaluation of steel structures.

본 연구에서는 콘크리트 구조물의 강도 향상을 위하여 혼입하고 있는 메타카올린의 내구성능 향상 효과를 규명하기 위하여 염화물이온 확산계수 및 단열온도상승량을 측정하였다. 그 결과, 메타카올린의 혼입으로 인하여 염화물이온 확산계수가 작아짐이 확인되었으며 플라이 애쉬의 첨가를 통하여 유동성의 저하를 억제할 수 있었다. 따라서 염분침투저항성을 확보하면서 물결합재비를 크게 하는 것이 가능하므로 메타카올린의 혼입으로 발생되는 단열온도상승량을 억제할 수 있어 콘크리트의 내구성능이 향상될 수 있음을 확인하였다.

서울지역 28개 지하구조물에 대한 정밀안전진단 결과를 활용하여 제안된 균열집중구간 및 탄산화 기반 한계상태함수를 산정하여 우선적인 보수구간을 선별하고자 하였다. 상태평가를 위해 분할된 503개 쉬트에 대한 균열밀도는 로그정규분포, 탄산화 및 피복은 정규분포의 현장조사 결과를 얻었다. 각 구간별 실시한 강도, 초음파속도, CO2농도, 철근부식도, 염화물함유량 등을 고려할 수 있도록 환경지수를 도입하여 합리적인 보수 우선순위를 제안하고자 하였다.

Traditional ancient tomb is blocked from outside air by the original role of the structure. However, recently at the structure has been excavated and robbed, it is in a state of being opened. It is not easy to prevent durability reduction of structure member according to the opened state. To this end, This study perforns the behavior characteristics evaluation according to durability reduction of traditional ancient tomb.

산업부산물인 폐유황의 재활용을 목적으로 개질 처리된 유황을 대상으로 콘크리트용 혼화재료로서의 개질 처리된 유황 액체와 분말을 콘크리트에 0%, 5%, 10%, 15% 외할 첨가하여 개질유황 액체와 분말의 첨가별 물리적 특성 및 내구성능을 평가한 결과를 고찰하였다.

The durability of Latex modified concrete(LMC) is increased when compared with conventional pavement concrete. But LMC have a several problems. In odrer to improve the problem of LMC, Remicon latex modified concrete(Remicon LMC) was developed. In this study, the durability of Remcion LMC containing extra admixture was compared with latex ratio. From the results, when latex and admixture was mixed in concrete, the micro-pores are decreased. And, the durability of Remicon LMC is increased comparing to conventional concrete.

To evaluate the durability characteristics of low permeable concrete using ground granulated blast-furnace slag with fineness 4,650 cm2/g, carbonation depth was measured. From the test results, persisting period of that was calculated. And it was found that carbonation depth of concrete was proceed 29.5 mm for 100 years.

This study investigated the durability of Green SHCC. The accelerated carbonation and electrical indication of ability to resist chloride ion penetration tests were performed. The test results compared to general concrete showed that the carbonation resistance and chloride ion penetration resistance of Green SHCC presents equivalent level of performance.