간행물
한국구조물진단유지관리공학회 학술발표대회 논문집
- 발행기관 한국구조물진단유지관리공학회
- 자료유형 학술대회
- 간기 반년간
- 수록기간 2012 ~ 2019
- 주제분류 공학 > 안전공학 공학 분류의 다른 간행물
- 십진분류KDC 531DDC 624
권호리스트/논문검색
2015 한국구조물진단유지관리공학회 봄 학술발표회 및 포럼 (2015년 4월) 262건
6분과. 재료 및 내구성
181.
2015.04
서비스 종료(열람 제한)
This study is a basic studies for estimating the temperature history of the concrete after a fire. In this study measured the carbonation depth after fire resistance tests. As a result, according to the existing fire damage diagnostic methods, carbonation depth must be than 5cm. However, the actual measured carbonation depth was 1.5 ~ 3.3cm.
182.
2015.04
서비스 종료(열람 제한)
The purpose of this study is to examine whether cementitious powder separated from waste concrete can be used as the alternative raw material for limestone and reducing the usage of natural resource (limestone) and CO2emission based on recycling cementitious powder from waste concrete.
Therefore, to reduce waste and CO2 emission in the cement industry and develop recycled cement, mix design was deducted by multi-objective optimization.
183.
2015.04
서비스 종료(열람 제한)
Analyzing the change of concrete pore structure due to carbonation and, also, considering the decrease of chloride binding capacity and the release of combined chloride ions, we established a comprehesive theoretical model which can reflect the influence of carbonation on chloride transport.
184.
2015.04
서비스 종료(열람 제한)
Recently, the use of high strength concrete is increasing in order to increase of high-rise building. High strength concrete has properties that are weak in fire. In severe case, buildings have risk of collapse owing to occur spalling. For these reasons, the authors think it is required to conduct various study about thermal and mechanical properties of high strength concrete in fire. This study analyze thermal and mechanical properties of high strength concrete at elevated temperature to use composite fibers mixed method which is one of method to prevent spalling.
185.
2015.04
서비스 종료(열람 제한)
Concrete subjected to dynamic loading shows local failure and it can be suppressed by improvement of flexural toughness with reinforced of fiber. Since bonding properties of fiber with matrix, specific surface area and numbers of fiber are different by fiber reinforcement type, mechanical properties of fiber reinforced concrete and improvement of impact resistance performance need to be considered. In this study, improvement mechanical properties by dynamic lodaing have been evaluated according to SF, PA fiber.
186.
2015.04
서비스 종료(열람 제한)
Concrete with blast furnace slag (BFS) shows varied strength development properties different from normal concrete. Therefore, a precise prediction of compressive strength using a full maturity model is desired. The purpose of this study is to predict the compressive strength of concrete with BFS by calculating the apparent activation energy (Ea) and rate constant (kT) for each BFS replacement ratio. The method of Carino Model is used in this study for predicting compressive strength of concrete with BFS.
187.
2015.04
서비스 종료(열람 제한)
In this study, fresh state properties and mechanical properties of low slump modified sulfur concrete have been evaluated in order to utilize the test results as baseline data for usability analysis of modified sulfur concrete which can be applied to slip-form method. As results, holding time of slump test was delayed under 5.0% of modified sulfur addition ratio. Also, compressive strength, and tensile strength of modified sulfur concrete were equivalent with that of plain concrete.
188.
2015.04
서비스 종료(열람 제한)
Currently, a technique to subdivide the process refining is introduced, can be divided into the steel slag. In this study, Free-CaO in the electric arc furnace slag by the ethylene glycol method for the quantitative analysis for the expansion to proceed with construction materials.
189.
2015.04
서비스 종료(열람 제한)
Waste glass powder is efficient materials as a Supplementary Cement Materials(SCM). Recently, A number of waste glass have been occurred in glass-industry as by-products. However, almost previous research were deal with bottles, glass containers. Therefore, X-ray diffraction and thermogravimetric analysis was carried out to evaluate pozzolan reaction of various waste glass samples. Pozzolan reaction of Waste Glass Sludge(WGS) was more faster than the other waste glass samples, especially in early stage.
190.
2015.04
서비스 종료(열람 제한)
Based on literature reviews, it was found that the dynamic increase factor, which is defined as the ratio of the dynamic strength to the static strength, is clearly dependent on specimen size, types, and experimental methods. It is expected that the proposed dynamic increase factor is significantly useful for numerical analysis of concrete behavior subjected to blast or impact.
191.
2015.04
서비스 종료(열람 제한)
In this study, we evaluate the chloride ion permeability of steel fiber rein-forced concrete. NT Build 492 experiment was used for the evalation. During the cast of SFRC, compaction works were done in same level. As a result, the chlorine ion permeability of the steel fiber rein-forced concrete is affected by Water-cement ratio. Effect of pores in the SFRC on permeability is dominant. In conclusion, it is important to get better quality of during cast in accordance with the addition of steel fiber ratio.
192.
2015.04
서비스 종료(열람 제한)
Industrial by-products in combination with FA, BS was excellent compressive strength, chloride penetration resistance by OPC 60(W/C 60%) based on the comparative analysis. The most effective periods were BS 28 days and FA 56 days.
193.
2015.04
서비스 종료(열람 제한)
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.
194.
2015.04
서비스 종료(열람 제한)
Shock wave caused by the high-velocity impact causing the tensile strain and stress on the rear side. When the tensile strain and stress exceeds the tensile strength of the concrete, crack and fracture were occurred. The strain on the rear side was reduced due to Improvement of the tensile strength by fiber reinforcement and increasing the specimen thickness.
195.
2015.04
서비스 종료(열람 제한)
In this paper, evaluation of compressive strength development of concrete cured by microwave heating system is introduced. For this evaluation, core strength tests were conducted. Test results show that the development was accelerated by microwave heating system. And two parameters in a equation for predicting initial strength development were presented when using this system.
196.
2015.04
서비스 종료(열람 제한)
197.
2015.04
서비스 종료(열람 제한)
Permeability is not a function of porosity alone, it depends on the porosity, pore size and distribution, and tortuosity of pore channels in concrete. There has been considerable interest in the relationship between microstructure and transport in cementitious materials, however, it is very rare to deal with the experimental study on the gas permeability coefficient of concrete. In this study, Yoon’s test was introduced. As the experiment result of gas permeability for carbonated concrete, gas permeability coefficient was successfully obtained and this was obvious for concrete with high w/c ratio
198.
2015.04
서비스 종료(열람 제한)
In this paper, the length change of mortar substituted the crushed heavy weight waste glass as fine aggregate are evaluated. From the results, when waste glass substitution ratio increase, ASR expansion increase. However, the dry shrinkage decrease. So, the length change of mortar are significantly affected by waste glass substitution ratio.
199.
2015.04
서비스 종료(열람 제한)
본 연구는 PSC그라우트에 초단유리섬유를 첨가하거나 치환하였을 때, PSC구조물용 그라우트가 가지는 적합성에 대하여 연구하였다. 초단유리섬유를 첨가하였을 때 유하속도가 증가하여 작업성이 떨어진다. 또한 블리딩이 발생하지 않았으며 압축강도가 증진되는 것을 확인할 수 있었다. 치환할 때 유하속도가 감소했으나 블리딩이 발생하였고, 압축강도가 증진되었다. 따라서 수화반응을 일으키지 않는 초단유리섬유로 인하여 유동성이 증가하고 압축강도가 증진되었다.
200.
2015.04
서비스 종료(열람 제한)
Ultra high strength concrete was introduced into architectural members. The current ultra high strength concrete can achieve compressive strengths up to 200 MPa and tensile strengths up to 20 MPa. In this study, the flexural and shear strengths in precast structural beams using ultra high strength concrete are evaluated and compared with reinforced concrete beams. This paper also provide a design flexural strength formula for the developed members.
