본 연구에서는 플라이애시가 90 %만큼 다량치환된 모르타르에 알칼리 활성화를 통한 강도증진을 동일한 양생온도 조건 에서 양생방법 및 유지시간 변화에 따라 비교 분석하고자 하였다. 연구 결과로 플래이애시를 90 % 치환한 경우, 소생재 도 포 후 40℃로 24시간 기중양생시 가장 높은 압축강도를 발휘하였지만, OPC의 압축강도까지 발휘하는 것은 어려울 것으로 분석되었다.

본 논문에서는 혼합골재 종류 변화 및 CGS 치환율에 따른 콘크리트의 내구성 특성을 분석하였다. 실험결과 CGS 치환율이 증가할수록 AE공기량의 영향으로 내동해성은 저하, 조직치밀화의 영향으로 탄산화는 지연되는 것으로 나타났다.

본 연구에서는 선별파쇄 골재 등 부순 골재에 포함된 토분함유량 규정치를 정하는 연구의 일환으로써 골재 토분이 모르타르의 기초적 특성에 미치는 영향을 분석하였다. 토분함유량이 증가할수록 유동성과 휨강도는 감소하고, 공기량은 증가하며 압축강도는 1 % 전후에서 증가하는 경향도 나타났으나 전반적으로 감소하였다.

본 연구에서는 플라이애시가 다량치환된 모르타르에 알칼리 활성화를 통한 강도증진을 양생온도 및 양생방법 변화에 따라 비교 분석하였다. 연구 결과로 플라이애시를 60 % 과다치환한 경우 소생재 도포 후 40℃의 온도로 48시간 기중양생을 실시한다면 OPC의 28일 압축강도에 근접하게 발휘되는 것이 얻어졌다.

본 연구에서는 외기온 영하조건에서 노출시간 변화별 콘크리트의 초기동해 피해를 입는 온도이력을 확인하고, 실험연구결과 –10℃인 외기조건에서 200 mm 두께의 슬래브는 18시간까지는 외기온에 노출되어도 콘크리트의 수화열에 의해 초기동해 피해가 발생하지 않는 것을 알 수 있었다.

본 연구에서는 Durometer A타입으로 응결시간에 확실하게 차이를 나타낼 수 있는 플라이애시(이하 FA) 치환 콘크리트에서 프록터 관입저항 시험치와 경도치를 비교 분석하고자 하였다. 연구결과로 프록터 관입저항 시험치와 Durometer A타입의 경도치는 곡선의 형태로 높은 상관관계를 나타내었다. 표면 마감작업에 대하여 Durometer A타입의 경도치로 약 25 HD는 초결, 약 35 HD는 종결로 관리한다면 표면 마감작업시간 판정에 효과적일 것으로 사료된다.

본 논문에서는 건물 외장벽돌의 박락사고와 관련하여 박락의 응력 원인 및 방지대책 등에 고찰 및 제안하였다. 즉, 설계자는 건축물 시공전 설계도면 및 시방서를 철저히 검토하여 건조수축 및 온도 변화에 따른 팽창수축 등 거동에 무리가 없는지, 또한 연결철물도 단단히 고정되게 되어있는지를 검토하고, 시공과정에서 시공 및 감리자는 철저히 확인 및 감독할 필요가 있는 것이다.

This study was conducted to compensate for the decrease in intensity due to the decrease in temperature and proposed temperature correction strength T28, using the Fractional function model.

As a result of this study, the testor penetration resistance and the hardness of the durometer are considered highly correlated and are thought to be effective when using the durometer to determine the setting time in the field structure.

This study was conducted to propose a strength correction factor to compensate the strength delay at designed age caused by the temperature drop in low temperature condition. Strength correction factors due to temperature drop T28 were provided using the constant function model.

In this study, the mechanical properties of concrete incorporating blast furnace slag with 60 % were analyzed according to CBS-Dust replacement rate. Results indicate that replacement of more than 10 % of CBS-Dust have a positive effect on reducing waste disposal costs and strength improvement

In this study, as series of studies to provide how to apply coal gasification slag(CGS) as one of byproducts for high strength concrete, from a newly introduced power generation method in Korea, the possibility of using a mixed aggregate with 25 percent of CGS as a concrete residual were investigated. The results indicated that the compressive strength of concrete using CGS at early age was lower than that using CS, but compressive strength at 28 days showed similar levels of strength enhancement.

This study was conducted to improve the economy, quality, and load of Soil paving concrete by using waste materials such as Oystery and Dolomitic to solve strength reduction and durability reduction caused by hardening agents in Korea. According to the results of the study, for the curing expenses, the Fine part agreement (FC) and the Furnace slag power lower (BS) are 5:5, It was possible to verify that the best results were obtained in terms of the quality of cement mortar when the natural organic lime and dolomitic lime were mixed at a ratio of 5:5.

In this study, a series of studies is intended to elicit the improvement of the quality of Admixture Substitute Concrete using oil refined for petrochemical work (ERCO). In other words, ERCO is used to analyze the basic properties of Admixture Substitute Concrete by pre-adding the AE liquid solution on its products. As an experimental variable, the method of adding ERCO was added after mixing it with concrete. In addition, the mixing ratio was planned to be 2 levels of 0, 0.5 %, and the total volume of the AEs injection quantity is 5 % that combines 0, 1, 2, and 3 % of the mixed ERCO mass of concrete. As a result, as the pre-injection of AE was increased, the characteristics of the concrete showed that the slump, and air contents were not improved, and the pre-adopting effects of AE agent were also significantly increased in the concrete.

In this study, the correlation with a proctor penetration resistance tester is analyzed for the purpose of judging the setting time of concrete by the convenient portability of the durometer which is a rubber hardness meter.The result of this study showed a high correlation between the value of the tilt of the durometer and the measured value of the proctor penetration resistance tester.

This study is a basic review of the use of CGS generated in IGCC as a fine aggregate for concrete, and a basic feature of cement mortar was considered. The analysis shows that CGS and CS mix ratio is best when the CGS is mixed at about 0~50 % On the basis of workability and strength improvement effects. This is expected to contribute to the strength, workability, and quality improvement of concrete given the optimal mixing of CGS.

In this study, concrete slab with insulation and non-insulated formwork was used to monitor and control its strength using a wireless sensor network with equivalent age method. As a result, the temperature and compressive strength of the structures were monitored without any problems, which revealed a good management tool.

In this study examined the strength of wall concrete using insulated molds and non-insulated forms by monitoring the strength of the structure using a wireless sensor network by maturity method. It was confirmed that the temperature and compressive strength of the structures are monitored in real time, along with effective strength control.

In this study, the purpose of the study is to determine the depth of damage caused by early frost damage in concrete slab structures under the conditions of external temperature during winter. In other words, we intend to analyze the depth variation of the early frost damage as the thickness of the concrete slab member changes under the condition of the 3-component binder frequently used in practice. As a result, the thinner the component, the significantly reduced the overall temperature of the concrete. In addition, the thinner the component thickness, the higher the delay in increasing the brightness of the core collected from the concrete member, and the greater the effect on the depth of the early frost damage was on the thinner the component thickness.

In this study, fundamental properties and change with time of cement mortar accompanied with change of solid content ratio of PC type superplasticizer were analyzed. As a result, it was clarified that the flow and air content decreased as the solid content ratio decreased, and the compressive strength increased slightly.