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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Recycled Construction Resources Institute
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Journal DOI :
Korean Recycled Construction Resource Institute
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Volume & Issues
Volume 3, Issue 4 - Dec 2015
Volume 3, Issue 3 - Sep 2015
Volume 3, Issue 2 - Jun 2015
Volume 3, Issue 1 - Mar 2015
Selecting the target year
Thermal and Mechanical Properties of Alumina Cementitious Composite Materials
Yang, In-Hwan ; Lee, Jung-Hwan ; Choi, Young-Cheol ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 199~205
DOI : 10.14190/JRCR.2015.3.3.199
The mechanical and thermal properties of high temperature aluminate cementitious thermal storage materials were investigated in this paper. Alumina cement was used as basic binder and the effect of the replacement of fly ash, silica fume, calcium sulfo-aluminate and graphite for alumina cement was investigated. Experiments were performed to measure mechanical properties including compressive strength before and after thermal cycling, and split tensile strength, and to measure thermal properties including thermal conductivity and specific heat. Test results show that the residual compressive strengths of mixtures with alumina cement only, or alumina cement and silica fume were greater than those of the others. Additionally, the specific heat of mixture with graphite was largest in all the mixtures used in the study. The results of this study could be used to provide realistic information for material properties in thermal energy storage concrete in the future.
An Evaluation of Elasticity Modulus and Tensile Strength of Ultra High Performance Concrete
Ryu, Gum-Sung ; Yoo, Sung-Won ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 206~211
DOI : 10.14190/JRCR.2015.3.3.206
Recently, for UHPC (Ulta High Performance Concrete) which is researched actively, as the tensile strength is absolutely influenced on the content of steel fiber, in this paper, experiments of compressive strength, elasticity modulus and tensile strength were performed according to compressive strength and content of steel fiber as variables. By the test results, compressive strength, elasticity modulus and tensile strength are proportioned and have a good correlation and according to content of steel fiber, compressive and tensile strength are also proportioned and have a good correlation. In case of elasticity modulus, the difference between test and present design code is not large, so it is possible to adapt to present design code. On the other hand, in case of tensile strength, as there is no specification of present design code, new prediction equation is proposed by using nonlinear regression analysis and the proposed equation have a good correlation to test results.
A Fundamental Study on Induction Technology of Separation Behavior Using Two-sided Adhesion of Joint of Composites Waterproofing System
Park, Jin-Sang ; Lee, Tae-Yang ; Kim, Dong-Bum ; Park, Wan-Goo ; Heo, Neung-Hoe ; Oh, Sang-Keun ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 212~219
DOI : 10.14190/JRCR.2015.3.3.212
This study focuses evaluating the efficiency and performance evaluation of composite type sheet-membrane waterproofing method that utilizes a separation behavior inducement system designed to resolve the chronic problems of disintegration and damage of overlap areas of waterproofing layers. As the result of the test, the tensile strength value was at 13.8N/mm and elongation rate at 587% for the separation behavior inducement type specimen, and the compared specimens had 14.2N/mm for tensile strength and 335% for elongation rate. For the separation behavior adhesion method specimen, when tensile stress or displacement occurred, the Zero-Span tension occurrence did not follow, which resulted in that the bottom sheet layer and the top membrane layer did not simultaneously becoming damaged. When undergoing the top and bottom layers were separated through separation behavior due to lack of flexibility, the bottom layer began to damage at the primary stage, and with the allowed boundary the upper membrane layer began to display flexibility and showed continuous displaced resulting in secondary phase damaging.
Effect of Silica Fume Types on the Mechanical Properties of Ultra-High Performance Concrete
Park, Chun-Jin ; Koh, Kyung-Teak ; Ahn, Gi-Hong ; Han, Min-Cheol ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 220~227
DOI : 10.14190/JRCR.2015.3.3.220
Ultra high performance concrete (UHPC) uses large quantities of steel fiber, silica fume, filler and superplasticizer for a low water-to-binder ratio (W/B). Despite of exceptional mechanical performances, UHPC exhibits increased viscosity due to the adoption of silica fume and its fabrication cost is costlier than ordinary concrete because of the use of large quantities of expensive materials. Following, this study evaluates the mechanical properties of 180MPa-UHPC using zirconium silica fume (Zr) instead of silica fume with respect to the quantity and type of superplasticizer (SP) and the size of filler. The results reveal that the Zr-UHPC using W/B of 20%, 100% of Zr, amount of SP-L of 2 to 3% and
-filler with steel fiber in 1.5 vol.% can develop better fluidity than the traditional mix composition using silica fume and secure a compressive strength higher than 180 MPa. In addition, the proposed mix composition is shown to enable a reduction of the fabrication cost by 33% compared to traditional UHPC.
Influence of Painting Materials based on Wasted Oil and Applying Timing on Carbonation and Chloride Resistances of High Volume SCM Concrete
Han, Cheon-Goo ; Choi, Young-Doo ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 228~236
DOI : 10.14190/JRCR.2015.3.3.228
In this research, the influence of painting materials and applying timing on carbonation and chloride resistances of high volume SCMs concrete was evaluated. As a durability improving method, comparative tests were conducted with painting materials of ERCO (emulsified refined cooking oil), RCO (refined cooking oil), WR (water repellent agent), and ERCO + WR and with painting timings of right after demolding, and 28 days after the wet curing. From the experiment results, in the case of carbonation and chloride resistance, the carbonation depth and chloride penetration depth were decreased when the painting materials were applied in 28 days of wet curing. Additionally, for painting materials, with the order of ERCO, RCO, ERCO+WR, and WR, the carbonation and chloride penentration was delayed. Hence it is considered that ERCO shows the most favorable performance of resistance against carbonation and chloride penetration.
Isothermal Conduction Calorimetry Analysis of Alkali Activated Slag Binder
Choi, Young-Cheol ; Cho, Hyun-Woo ; Oh, Sung-Woo ; Moon, Gyu-Don ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 237~243
DOI : 10.14190/JRCR.2015.3.3.237
In this research, isothermal conduction calorimetry analysis has been conducted to investigate the reactivity of alkali activated slag binders. In order to secure the reactivity and workability of alkali activated slag binders, experiences with various types and concentrations of alkali activators were performed. Isothermal conduction calorimetry were measured with different alkali activators and mass ratio of
to binders as variables, and sodium tripolyphosphate (
) and hydrated sodium borate (
) were used to control setting time. As a results, alkali activated slag binders required alkali activators with 4 to 5 percent of concentration to accelerate the formation of calcium silicate hydrate(C-S-H) by alkali-activation, and overall heat generation rate delayed as accumulated heat decreased due to the high
contents. Moreover, the use of hydrated sodium borate as setting retarder causes elongated setting time due to delaying heat generation, so it can be considered that setting retarder played an important role in delaying total heat generation rate.
Fundamental Characteristics of Concrete According to Fineness Modulus and Replacement Ratio of Crushed Sand
Yun, Yong-Ho ; Choi, Jong-Oh ; Lee, Dong-Gyu ; Jung, Yong-Wook ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 244~251
DOI : 10.14190/JRCR.2015.3.3.244
The paper evaluates the effect of the physical property, fineness modulus (FM) and replacement ratio of crushed sand on the characteristics of concrete. This is intended to use crushed sand from Daegu-Kyungbuk region as the fine aggregate of concrete. The experimental result indicates that the replacement ratio of crushed sand needs to be less than 50% to satisfy the mixed gradation of both natural and crushed sand when their FMs are 2.0 and 3.2, respectively. The slump of concrete with crushed sand increased as the replacement ratio of crushed sand increased, while the workability of concrete with the replacement ratio of more than 75% was significantly reduced. The air content and bleeding rate of concrete was reduced as the replacement ratio increased. Furthermore, due to the enhancement of the concrete adhesive regardless of the FM of crushed sand, compressive strength of concrete tended to improve as the replacement ratio increased.
Engineering Performance of Extruded Fly Ash Cement Panel with Bottom Ash
Lee, Myeong-Jin ; Kim, Jin-Man ; Han, Dong-Yeop ; Choi, Duck-Jin ; Lee, Keun-Woo ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 252~260
DOI : 10.14190/JRCR.2015.3.3.252
The aim of this research is providing the fundamental data for treating and recycling the byproducts by using the wet processed bottom ash as a fine aggregate replacement for cement-based extruded panel. Although the cement-based extruded panel was used mainly as a cladding component with its high strength and outstanding durability, it was hardly spread because of low economic feasibility due to the high cost of additives or fibers which were used to achieve 14 MPa of flexural strength as a cladding material. As a solution of this drawback, by the previous research, it was possible to replace cement by fly ash up to 80 % by decreasing quality criteria with restricting the application to indoor purpose. In this research, based on the previous research, by using the bottom ash as a replacement of fly ash, improvement of shape retention performance is tried. As a result of the experiment on evaluating the optimum content and PSD of bottom ash, as the fineness modulus and content of bottom ash was increased, the extruding performance was decreased and penetration resistance was increased. Additionally, the optimum content and the maximum particle size was found as 20 %, and 0.3 mm, respectively.
Strength Development and Durability of High-Strength High-Volume GGBFS Concrete
Kim, Joo-Hyung ; Jeong, Ji-Yong ; Jang, Seung-Yup ; Jung, Sang-Hwa ; Kim, Sung-Il ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 261~267
DOI : 10.14190/JRCR.2015.3.3.261
To develop high-strength high-volume ground granulated blast-furnace slag (GGBFS) concrete, this study investigated the characteristics of strength development and durability of concrete with the water-to-binder ratio of 23% and the GGBFS replacement ratio of up to 65%. The results show that the compressive strength of GGBFS blended concrete is lower than that of ordinary Portland cement (OPC) concrete up to 3-day age, but the becomes higher after 7-day age. Together with strength increase, the pore structure becomes tighter, and thus the resistance to chloride ion penetration increases. Therefore, the GGBFS blended concrete has high resistance to freezing and thawing without additional air-entraining, and high resistance to carbonation despite low amount of calcium hydroxide (
). On the other hand, if silica fume (SF) is blended with GGBFS, the strength becomes lower than that of the concrete blended with GGBFS only, and the resistance to chloride ion penetration deceases. Therefore, it needs further studies on the reaction of SF in high-strength high-volume GGBFS concrete.
The Experimental Study on Mixing and Quality Properties of Quaternary Component Blended High Fluidity Concrete with CO
Jo, Jun-Hee ; Kim, Yong-Jic ; Oh, Sung-Rok ; Choi, Yun-Wang ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 268~276
DOI : 10.14190/JRCR.2015.3.3.268
In this study,
reduction type quaternary component high fluidity concrete was produced with more than 80% reduction in cement quantity to increase the use of industrial byproducts and enhance construction performance, thereby reducing
emissions. Furthermore, the quality properties, and
reduction performance of this concrete were evaluated. As a result of the quality evaluation of quaternary component blended high fluidity concrete with
reduction, the target performance could be achieved with a 80% or more reduction of cement quantity by mixing a large amount of industrial byproducts. The required performance level was obtained even though the flow, dynamic, and durability characteristics decreased a little compared to conventional mix. In addition, to analyze the
reduction performance of quaternary component blended high fluidity concrete with
reduction, the life cycle assessment (LCA) of the concrete was performed and the results showed that compared to the conventional mix, the carbon emissions decreased by 62.2% and the manufacturing cost by 24.5%.
Utilizability of Waste Concrete Powder as a Material for Soil Pavement
Kim, Yong-Jic ; Choi, Yun-Wang ; Kim, Young-Jin ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 3, 2015, Pages 277~282
DOI : 10.14190/JRCR.2015.3.3.277
This study is conducted to utilize waste concrete powder (WCP) made as a by-product manufacturing high quality recycled aggregate. The blaine fineness of the used waste concrete powder was
. As the main characteristic of waste concrete powder, it showed an angular type similar to cement, but hydrated products were attached on the surface of particles. In addition, the size of the particles of waste concrete powder was larger than OPC and in terms of chemical components it had higher
contents. For using WCP in soil cement-based pavement, the qualities, physical and chemical properties, of WCP should be researched. In the first step, the specified compressive strength of mortar for two types of clay sand soil and clay soil respectively was experimented to be 15 MPa and then optimum mixing ratio of chemical solidification agent were decided in the range of 1.5 - 3.0% in the replacement with cement weight content. In the second step, based on the prior experimental results, recycling possibility of WCP in soil cement-based pavement was studied. In the result of experiment the mixing ratio of WCP were 5, 10, 15 and 20% in the replacement with soil weight and the compressive strength of mortar was somewhat decreased according to the increase of the mixing ratio of WCP.