In this study, the drying shrinkage of concrete used for the reduction of expansive additive and shrinkage reducing agent committed to the concrete Mixing characteristics, compressive strength and drying shrinkage of examining my new honhwajaeryoin elements by putting in concrete Their characteristics were compared and analyzed. Experiments, SP was fixed jeryangeul equally expansive additive and shrinkage reducing agent in the formulation of the Injection rate increased with increasing fluidity, shrinkage reducing air flow rates increase the amount of air even if the input Increases with, and if the expansion of re-injection rates increase rather than decrease was found that the volume of air. I committed to the elements of the concrete, but an increase in inputs even if the air content of concrete or no liquidity Were confirmed to have no effect. In addition, the compressive strength test Shrinkage Reducing the dosage increases, Tended strength falls, inflation 5.0% of material inputs in the formulation was found to be the highest. Element material Concrete with Shrinkage Reducing committed a similar compressive strength falls with increasing dosage tended Unlike the small degree of shrinkage reducing agent was affected. Shrinkage characteristics include all three admixture With increasing dosage can reduce the drying shrinkage was observed that, if the shrinkage reducing agent, of the elements and almost Reducing the level of contraction was found to be. Therefore, the element first, if you commit to concrete admixtures to Characteristics of the concrete mix does not affect the lapse rate contract that can be used as a highly admixture is judged to be here.

라텍스 개질 콘크리트의 건축구조물 옥상 포장에 적용할 수 있는 기초연구로서, 포장면의 균열 저감을 위해 수축저감제의 혼입에 따른 모르타르의길이변화 성능을 평가하였다. 평가결과, 수축저감제를 혼입하지 않은 Plain에 비하여 수축저감제 혼입에 따라 모르타르 공시체의 길이변화율이 감소되는 것으로 나타났으며, 수축저감제 혼입량에 따른 변화량의 차이는 미소하였지만 균열저감 효과는 있는 것으로 확인되었다.

In recent years, in order to reduce self-weight of structural elements, the use of SCP(Steel Concrete Plate) is getting increased. Since SCP has complicated sectional shape and includes large amount of studs, the use of shrinkage reduction concrete is required. Therefore, in this study, to prevent the restrained shrinkage behavior by stud, the effects of using expansive agent (EA) and shrinkage reducing agent (SRA) was investigated.

This study presents the results of experimental research to investigate the drying shrinkage properties of mortar containing the fly-ash and glycol-ether shrinkage reducing agent. the drying shrinkage of mortar was measured according to KS F 2424. It was confirmed from test results that 10% fly-ash replacement and 1% shrinkage reducing agent is most effective to decrease the shrinkage of mortar

In recent years, in order to reduce self-weight of structural elements, the use of SCP(Steel Concrete Plate) is getting increased. Since SCP has complicated sectional shape and includes large amount of studs, the use of shrinkage reduction concrete is required. Therefore, in this study, to prevent the restrained shrinkage behavior by stud, the effects of using expansive agent (EA) and shrinkage reducing agent (SRA) was investigated.

This study presents the results of experimental research to investigate the drying shrinkage properties of mortar containing the fly-ash and glycol-ether shrinkage reducing agent. the drying shrinkage of mortar was measured according to KS F 2424. It was confirmed from test results that 10% fly-ash replacement and 1% shrinkage reducing agent is most effective to decrease the shrinkage of mortar.

이 연구의 목적은 개착식 전력구 콘크리트에 발생하는 부등건조수축에 의한 균열특성을 파악하고, 수축저감제 혼입에 따른 건조수 축균열특성을 분석하는데 있다. 따라서 이 연구에서는 전력구 박스형 콘크리트 구조물의 부등건조수축에 의한 균열특성을 파악하기 위하여 세 가지 주요영향인자를 고려한 수치해석과 수치해석을 한 결과와 실제 전력구 타설을 하여 측정한 차이를 확인해 보았다. 본 연구로부터 건조 수축 시험체에 대한 건조수축량을 산정에 대한 해석 기법을 개발하였으며, 실제 전력구 타설 실험을 통해 종방향 및 횡방향 균열발생 가능성을 입증 하였다. 전력구 실증시험체 건조수축량 수치해석 결과, 균열저감 콘크리트 배합의 경우 종방향 및 횡방향 응력에 있어 일반배합에 비해 40~50%정도의 현저한 감소를 보이며, 이에 따라 균열저감 콘크리트를 전력구에 적용하였을 경우 현저한 균열감소 효과를 보일 것으로 예측된다.

HPFRCC는 물-결합재비 (W/B)가 20%로 상당히 낮고 굵은 골재를 사용하지 않으며, 고분말 혼화재료를 혼입하기 때문에 자기수축이상당히 크게 발생하여 구조물 적용 시 균열저감대책이 필요하다. 따라서 이 연구에서는 HPFRCC의 수축을 효율적으로 저감시키기 위한 방법으로 수축저감제와 팽창재의 사용을 검토하기 위하여 이들의 단독 또는 병행 혼입률에 따른 역학적 특성과 구속 수축특성을 평가하였다. 구속수축 실험 중에서 링-테스트 (Ring-test)를 통하여 HPFRCC에 사용되는 시멘트에 대하여 중량비로 수축저감제 1%와 팽창재를 7.5%를 병행 사용하였을 경우 압축강도와 인장강도가 크게 저하되지 않으면서도 수축을 가장 효율적으로 저감시킬 수 있는 최적 배합임을도출하였고 수정된 건조수축 균열실험을 통하여 이를 검증하였다.

This study investigates the autogenous shrinkage of morta that contains shrinkage reducing agent (SRA) It is observed that the autogenous shrinkage of mortar was about 300με at 6 days after casting. The SRA reduces the autogenous shrinkage by an half, but unexpected expansion was observed between 1 and 2 days after casting.

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 research investigated the influence of adding SRA(Shrinkage reducing agent) on the direct tensile behavior of UHPFRC(Ultra high performance fiber reinforced concrete). The experimental test results revealed that the post cracking strength and strain capacity for the cement hydrated cement paste without at SRA were higher than that incorporate with 1% SRA.

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 study investigates the effect of emulsified refined cooking oil (ERCO) on the fundamental properties of cement paste, and their results are compared with that of shrinkage reducing admixture (SR). Results showed that ERCO decreased early strength, but retained the strength at the later age of 28 days, slightly higher than pure OPC