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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Recycled Construction Resources Institute
Journal Basic Information
Journal DOI :
Korean Recycled Construction Resource Institute
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Volume & Issues
Volume 2, Issue 4 - Dec 2014
Volume 2, Issue 3 - Sep 2014
Volume 2, Issue 2 - Jun 2014
Volume 2, Issue 1 - Mar 2014
Selecting the target year
Bottom Ash on the Application for Use as Fine Aggregate of Concrete
Kim, Seong-Soo ; Lee, Jeong-Bae ; Park, Seung-Ho ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 173~179
DOI : 10.14190/JRCR.2014.2.3.173
This is an experimental study for recycling coal ash left over from coal use as a potential fine aggregate in concrete. Coal ash is generally divided into either fly ash or bottom ash. Fly ash has been utilized as a substitution material for cement in concrete mixes. On the other hand, bottom ash has the problem of low recycling rates, and thus it has been primarily reclaimed. This study partially substituted fine concrete aggregates with bottom ash to increase its application rate and therefore its recycling rate; its suitability for this purpose was confirmed. The concrete`s workability dropped noticeably with increasing bottom ash content when a fixed water-cement ratio of concrete mix was used. Thus, concrete mixes with higher ratio levels are required. To address this problem, concrete was mixed using a polycarboxylate high-range water reducing agent. The fluidity and air entrainment immediately after mixing the concrete and 1 h after mixing were measured, thereby replicating the time concrete is placed in the field when produced either in a ready-mixed concrete or in a batch plant. As a result of this research, the workability and air entrainment were maintained 1 h after mixing for a concrete mixture with approximately 30% of its fine concrete aggregates substituted with the bottom ash. A slight drop in compression strength was seen; however, this confirmed that potential of using bottom ash as a fine aggregate in concrete.
Mechanical Properties of High Strength Concrete with High Volume Mineral Admixture
Baek, Chul-Woo ; Park, Cho-Bum ; Choi, Sung-Woo ; Jo, Hyun-Tae ; Ryu, Deuk-Hyun ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 180~187
DOI : 10.14190/JRCR.2014.2.3.180
The purpose of this study is to evaluate on the mechanical properties of High Volume Mineral Admixture(HVMA) high strength concrete to reduce the amount use of Ordinary Potland Cement, to discover the optimized HVMA binder and to test HVMA concrete based on the change of W/B and curing temperature. The results were shown as follows: The HVMA binder using the mixture of combined heat power plant fly ash and anhydrous gypsum known as inorganic activators with the mixture of blast furnace slag and fly ash was optimized. The mixture of HVMA high strength concrete at 26% of W/B ratio had a good result on flow characteristic and mechanical properties. High strength HVMA concrete over 50MPa is possibly manufactured over curing temperature
A Study on the Rheology Properties for Development of Sprayed High Performance Fiber Reinforced Cementitious Composites for Protection and Blast Resistant
Choi, Yun-Wang ; Choi, Byung-Keol ; Park, Man-Seok ; Sung, Don ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 188~195
DOI : 10.14190/JRCR.2014.2.3.188
This paper was evaluated the rheology properties according to each step of paste, mortar and HPFRCC as a part of the basic study to development of sprayed high performance fiber reinforced cementitious composites(HPFRCC) for protection and blast resistant. Rheology test results in step of paste, in case of GGBFs and FA, it showed that the plastic viscosity and yield stress reduced gradually according to the increase of mixing rate, and in case of SF, the plastic viscosity and yield stress increased radically starting from the mixing rate of 10%. Rheology test results in step of mortar, type of aggregates, it showed that particle shape and grading of aggregate is influence on plastic viscosity and yield stress, and change of volume ratio is influence on plastic viscosity than yield stress. Fluidity and rheology test results in step of HPFRCC, if after a fiber mixed, it showed that viscosity agent is more effective to improve the fluidity and fiber dispersion than superplasticizer.
Optimum Mix Proportions of In-fill Slurry for High Performance Steel Fiber Reinforced Cementitious Composite
Kim, Seung-Won ; Park, Cheol-Woo ; Kim, Seong-Wook ; Cho, Hyun-Myung ; Jeon, Sang-Pyo ; Ju, Min-Kwan ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 196~201
DOI : 10.14190/JRCR.2014.2.3.196
As political circumstances in oversea countries and Korea varies, the risk of vulnerability from unexpected extreme loading conditions, such as explosions or extreme impacts, also increased. In addition, construction companies in Korea recently have taken chances of overseas expansion to countries where their domestic situations are not in rest. Therefore, the resistance of construction materials for blast or impact loading become taking more consideration from engineering field. This study is a part of the research to develop a high performance fiber reinforced cementitious composite materials with high volume steel fibers and primary purpose of this study is to find an optimum mix proportions of in-fill slurry. In order to accomplish the tasks this study performed experimental investigations on the slurry for consistency, compressive strength, flowability, J-penetration, bleeding and rheology properties as well as mechanical properties, compressive and flexural strength, with respect to different mix proportions.
An Evaluation of Basic Mechanical Performance for High Volume Fly Ash Concrete
Yoo, Sung-Won ; Kwon, Seung-Jun ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 202~208
DOI : 10.14190/JRCR.2014.2.3.202
For evaluating basic structural behavior of HVFA (High Volume Fly Ash) concrete, several tests are performed considering different ratios of fly ash replacement and structural evaluation regarding compressive strength, elasticity modulus, stress-strain relationship, and bond strength is also performed. Test results show that elasticity modulus of HVFA concrete has close relationships with compressive strength and fly ash replacement ratio. The ultimate strain shows slight difference from domestic design code. On the other hand, there are no differences between general concrete and HVFA concrete for elasticity modulus and bond strength.
Ultrasonic Pulses Characteristics in Lightweight Fine Aggregate Concrete under Various Load Histories
Yoo, Kyung-Suk ; Kim, Jee-Sang ; Kim, Ik-Beam ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 209~216
DOI : 10.14190/JRCR.2014.2.3.209
One of the widely used NDT(Non-destructive techniques) is the ultrasonic pulse velocity (USPV) method, which determines the travel time of the ultrasonic pulse through the tested materials and most studies were focused on the results expressed in time domain. However, the signal of ultrasonic pulse in time domain can be transformed into frequency domain, through Fast fourier transform(FFT) to give more useful informations. This paper shows a comparison of changes in the pulse velocity and frequency domain signals of concrete for various load histories using lightweight fine aggregates. The strength prediction equation for normal concrete using USPV cannot be used to estimate lightweight fine aggregate concrete strength. The signals in frequency domain of ultrasonic pulse of lightweight fine aggregate concrete does not show any significant difference comparing with those of normal concrete. The increases in stress levels of concrete change the pulse velocities and maximum frequencies, however the apparent relationship between themselves can not be found in this experiment.
Study on Hydration Heat Analysis of Pier Foundation-Column Using Low Heat Concrete
Jeon, Joong-Kyu ; Kim, Sun-Gil ; Jeon, Chan-Ki ; Kim, Ki-Hyung ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 217~224
DOI : 10.14190/JRCR.2014.2.3.217
This study carried out to evaluate the hydration heat analysis and fundamental characteristics such as air content, slump and compressive strength for field application of low heat concrete with premixed cement. The results of experiment show that low heat concrete with premixed cement have sufficient performances on the workability and compressive strength. In addition, hydration heat analysis shows that low heat concrete with premixed cement make sure of target thermal cracking index. Therefore, it is desirable to apply the low heat concrete with premixed cement on pier foundation-column.
The Mechanical Properties of Recycled Plastic Fiber-Reinforced Concrete
Yang, In-Hwan ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 225~232
DOI : 10.14190/JRCR.2014.2.3.225
This paper concerns the mechanical properties of recycled plastic fiber-reinforced concrete. It presents experimental research results of recycled fiber-reinforced concrete with fiber volume fractions of 0, 0.5, 1.0, 1.5, and 2%. Experiments were performed to measure mechanical properties such as compressive strength, elastic modulus, tensile strength, and length changes. The results show that both compressive strength and elastic modulus decreased as fiber volume fraction increased. In addition, the experimental results show that recycled fiber-reinforced concrete is in favor of split tensile strength, flexural tensile strength, characteristic regarding crack mouth opening displacement, and length changes. The results of this study can be used to provide realistic information for modeling of mechanical properties in recycled plastic fiber-reinforced concrete in the future.
Thermal Cracking Control of Mass Concrete by Vertical Pipe Cooling Method
Seo, Tae-Seok ; Lim, Chang-Keun ; Cho, Yun-Gu ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 233~238
DOI : 10.14190/JRCR.2014.2.3.233
In case of the slender mass concrete like attached wall, retaining wall and bridge tower, the low heat cement and the control joint are mainly used for thermal cracking control. However, even if these cracking control methods are considered, it is impossible to control thermal cracks perfectly, because the external restraint is largely in these mass concrete. Because these cracks occurring in slender mass concrete members almost penetrate concrete member, the special cracking control is demanded in these mass concretes. The vertical pipe cooling method improving existing pipe cooling method was developed for the active thermal cracking control of slender mass concrete, and applied at the field attached wall. In results, the maximum temperature dropped more than
by vertical pipe cooling method, and the cracks decreased about more than 50%.
Effect of Anhydrite on the Mechanical and Durability Properties of High Volume Slag Concrete
Moon, Gyu-Don ; Kim, Joo-Hyung ; Cho, Young-Keun ; Choi, Young-Cheol ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 239~246
DOI : 10.14190/JRCR.2014.2.3.239
High volume slag concrete is attracting new attention and are thought to have promising potential for industrial applications, partly due to the climate debate, but especially due to their very low heat of hydration and their good durability in chemically aggressive environments. However, High volume slag concretes tend to have slower strength development especially. In this study, the effect of anhydrite (
) on the mechanical and durability performance of high volume slag concrete were investigated. The main variables were anhydrite contents (0, 4, 6, 8, 10%). Test results show that 4~8% anhydrite concrete have improved engineering properties (hydration, compressive strength, shrinkage, creep, carbonation) as control concrete at early ages.
Evaluation of Flow and Engineering Properties of High-Volume Supplementary Cementitious Materials Lightweight Foam-Soil Concrete
Shim, Sang-Woo ; Yang, Keun-Hyeok ; Lee, Kyung-Ho ; Yun, In-Gu ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 247~254
DOI : 10.14190/JRCR.2014.2.3.247
The present study prepared lightweight foam-soil concrete mixtures classified into three groups. Considering the sustainablility, workability, and compressive strength development of such concrete, high-volume supplementary cementitious materials (SCMs) were used as follows: 20% cement, 15% fly ash, and 65% ground granulated blast-furnace slag. As main test parameters selected for achieving the compressive strength of 1MPa and dry density of
, the unit solid content (dredged soil and binder) ranged between 900 and
, and soil-to-binder ratio varied between 3.0 and 7.0. Test results revealed that the flow of the lightweight foam-soil concrete tended to decrease with the increase of unit soil content. The compressive strength of such concrete increased with the increase with the unit binder content, whereas it decreased as soil-to-binder ratio increased, indicating that the compressive strength can be formulated as a function of its dry density and soil-to-binder ratio.
Analysis of the Cause of Waterleakage in Residential Apartment Underground Parking Ground and the Review of the Repare Methods
Oh, Sang-Keun ; Choi, Sung-Min ; Song, Je-Young ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 255~264
DOI : 10.14190/JRCR.2014.2.3.255
This study analyzes the cause and the repairing method of water leak by parts of basement parking lot which is recorded to have a high defect frequency in apartment buildings. It has been assessed that the cause of water leakage on the first floor upper substrate is due to such factors as landscaping and weights. During construction or through other cases, it has been determined that cracks were produced in the apartment structure because the structure was weak and exposed to the effects of the substrate movement. The base floor and underground external walls are areas that are exposed to water pressure (uplife pressure), thus in normal cases the rear surface repair of the structure using sythetic rubberized polymer gel should be considered as an effective method. However, in cases where application of waterproofing layer is required in the structure due to high water pressure, using asystolic cement milk grout to form the waterproofing layer and applying water-swelling acrylic material into the cracked areas is considered to be highly effective.
Durability Evaluation of Concrete Using Fine Sand of Nakdong-River
Kwon, Soon-Oh ; Bae, Su-Ho ; Lee, Hyun-Jin ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 3, 2014, Pages 265~271
DOI : 10.14190/JRCR.2014.2.3.265
It is strongly needed to investigate the fine sand as an alternative fine aggregate of well-graded river sand because the fine sand which is being enormously distributed in the midstream and downstream of Nakdong-River in Korea has a poor grading but good quality as a fine aggregate for concrete. Thus, the purpose of this experimental research is to evaluate the durability of concrete using the fine sand to utilize it actively as a fine aggregate. For this purpose, the concrete specimens using different fine sand were made for the specified concrete strength of 35MPa, and then their durability such as the resistance to freezing and thawing and carbonation, and drying shrinkage were evaluated. It was observed from the test results that the resistance to freezing and thawing and carbonation of concrete using the fine sand was similar to that of concrete using reference sand, but the drying shrinkage of concrete using the fine sand with small fineness was comparatively lager than that of concrete using reference sand.