A type of one-way concrete composite slabs made by strain hardening cementitious composites (SHCC) deck combined with high tensile reinforcements was developed and evaluated by four-point slab bending test. The SHCC material was considered to have an high-ductile and strain hardening behavior in tension after cracking. From experimental comparisons with conventional reinforced concrete slab, the proposed SHCC and high tensile reinforced concrete composite slab showed more improved responses both in service and ultimate load capacities as well as in control of crack width and deflection.

최근 건설분야에서도 스마트(Smart)라는 개념을 도입한 재료 및 구조방식의 개발에 관한 관심이 고조되고 있다. 특히 기존 콘크리트와 같은 시멘트 복합체에 다양한 전도물질을 혼입하여 외력의 작용시 유발되는 변형을 시멘트 복합체의 저항변화로 평가하는 자기 감지형 건설재료 개발 연구가 활발히 진행되고 있다. 통상적으로 시멘트 복합체는 인장변형에 대한 저항능력이 낮기 때문에 주로 압축변형과 전기적인 저항특성의 상관성을 평가하는 연구 즉, 압축변형 감지능력을 갖는 시멘트 복합체 개발에 관한 연구가 대부분이었다. 본 연구에서는 직접인장하에서 0.5% 인장변형시까지 자기 감지능력을 갖는 변형 경화형 시멘트 복합체(SHCC)를 개발하고 또한 철근의 보강이 SHCC의 자기 감지능력에 끼치는 영향을 평가한다.

자연에서 볼 수 있는 디자인적 요소들이나 생물체의 특성들을 연구 및 모방을 통해 과제를 해결하는 것을 생체모방공학이라 이른다. 조개껍질의 주요성분은 시멘트계 재료와 유사하게 탄산칼슘으로 이루어져 있으나, 적층구조로 층상화된 구조로 이루어져 높은 인장강도 발현한다. 본 연구에서는 이러한 조개껍질의 형상을 생체모방하여, 고인성 시멘트 복합재료를 활용하여 적층으로 이루어진 휨부재를 제작하였으며, 휨시험을 통해 그 성능을 평가하였다.

본 연구에서는 표면 침투 및 코팅형 흡수방지재인 Polydimethylsiloxane(PDMS)을 고인성 섬유복합체(ECC)에 적용하여 적용성, 강도 평가 및 염화물이온 침투 저항성능에 대한 연구를 수행하였다. PDMS 적용 방법에 따른 침투깊이를 분석한 결과 모든 방법에서 KS F4930 의 기준을 만족하는 것을 확인하였다. 적용 방법 중, 침지 방법이 가장 우수한 침투깊이를 보였으나 현장적용성을 고려할 경우 스프레이 방법이 적용 가능한 것으로 확인되었다. ECC 배합에 따른 PDMS 침투깊이 실험 결과 배합강도가 감소할수록 침투깊이는 최대 70% 이상 증가하는 경향을 나타났다. 압축강도 시험 결과에서는 PDMS 침투 깊이가 큰 M4-A, M4-B 시험체의 압축강도는 PDMS를 적용하지 않은 M4 시험체와 비교하여 9.6%, 8.0% 압축강도가 감소하였다. 또한, 침투깊이가 작은 M1-A와 M1-B 시험체의 압축강도는 M1 시험체와 비교하여 4%, 2.2% 감소하여 PDMS 침투깊이가 클수록 강도감소율이 증가하였다. 염소이온침투 저항성능 평가 시험결과, PDMS의 침투깊이가 클수록 염소이온 침투 저항성능이 향상되는 것을 확인하였다.

This research is an application of SHCC (Strain harding Cementitious Composite) in concrete shear wall system in order to improve the structural performance of conventional shear walls. Based on experimental loading results, it was observed that the developed SHCC shear walls showed improved strength as well as enhancements in controlling of bending and shear cracks.

This research, concrete materials used SHCC(Strain harding Cementitious Composite) in RC(Reinforced Concrete) shear walls. We tried to identify the performance of developed shear wall. Specimens were only considered gravity load and designed and detailed in compliance to KCI-2012. Based on the loading experiment results, this study was found that the developed shear walls showed improved strength than RC shear wall in controlling bending and shear crack. The developed　shear wall with minimum shear reinforcement increased the more strength than RC wall with nominal shear reinforcement

This research was studied on seismically strengthened RC columns with Strain Hardening Cementitious Composites(SHCC). The seismic performance of the SHCC-RC composite columns in SDOF system was evaluated by the concepts of seismic performance-based design approaches; the Capacity Spectrum Method(CSM), the Direct Displacement Based Design(DDBM) and the Displacement Coefficient Method(DCM).

The research presents a reinforced concrete columns using Strain Hardening Cementitious composites (SHCC). For the columns, in order to predict seismic performances, several methods are evaluated in SDOF systems such as the Capacity Spectrum Method (CSM), the Direct Displacement Based Design (DDBM) and the Displacement Coefficient Method (DCM).

This paper presents a half-precast composite concrete slab using a strain-hardening cementitious composites (SHCC). The flexural characteristics of SHCC-RC Composite slab was evaluated with a conventional reinforced concrete slab and the composite slab was excellent in crack control to compare with the reinforced concrete slab.

This paper presents a half precast strain-hardening cementitious composites (SHCC) and reinforced steel truss deck in order to develop SHCC and reinforced concrete composite slabs. The developed half precast decks were evaluated for loading of construction stages and presented excellent flexural performances during construction stages.

In the research, there were seismically strengthened reinforced concrete composite columns by applying Strain Hardening Cementitious Composites(SHCC). The seismic performance of SHCC-RC composite columns were studied by the concepts of seismic performance-based design approaches as well as with experiments.

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.

This experimental study investigates the influence on the tensile behavior of strain-hardening cement composite (SHCC) with HR and SWP Shrinkage Reducing Admixture (SRA). SRA can also improve the tensile strength and multiple cracks of SHCC material used in this study.

This experimental study investigates the influence on the flexural behavior of strain-hardening cement composite (SHCC) with HR and SWP Shrinkage Reducing Admixture (SRA). SRA can also improve flexural strengths and flexural toughness.

This paper presents a reinforced concrete composite slab with a strain-hardening cementitious composites (SHCC). This slab system has merits in longer-span. minimizing the reinforcements as well as improving crack control. The field application in construction is suitable to apply the non-supporting formwork system in construction.

The purpose of this study is to evaluate the flexural performance of a SHCC (Strain Hardening Cementitious Composites) panel which was manufactured by steam curing method for precast slab system. From the bending test result, it was found that the SHCC panel showed approximately 7.32 MPa of maximum flexural strength, 58 mm of mid-span deflection appearing excellent strain hardening behavior and multiple micro cracks between bending moment section of the specimen.

This experimental study examines the test results on the flexural behavior of strain-hardening cement composite (SHCC) with two types of Shrinkage Reducing Admixture (SRA). An influence of SRA on the flexural behaviors of SHCC mixes was observed.

This experimental study evaluates of seismic performance on strain-hardening cement-based composite (SHCC). The objective of this study is to evaluate of cross-sectional reduction (1400×800×70 and 1120×520×40㎜) and design compressive strength level (45 and 50 MPa). The experimental results as cross-sectional reduction, peak loads are not significantly different. but energy area is decrease.

This paper is about flexural performance of shotcreting SHCC according to stages. The study results showed that shotcrete SHCC is possible to connection of reinforced concrete frame and retrofitted member.

This paper investigates The purpose of this research was to investigate the effects of expansive admixture on the tension stiffening performance and cracking process of SHCC with polyethylene(PE) fiber. Testing was carried out on four axially loaded tension tie specimens. Each specimen had a square cross-section dimension 100 × 100mm of and length of 1200mm. As a result, using an expansion admixture can improve a prestress and reduce an initial shrinkage crack.