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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 1, Issue 3 - Dec 2013
Volume 1, Issue 2 - Sep 2013
Volume 1, Issue 1 - Jun 2013
Selecting the target year
Experimental Evaluation on Occurrence Possibility of Pollutants from Aggregates
Park, Jeong-Ho ; Seong, Jin-Uk ; Park, Je-Chul ;
Journal of the Korean Recycled Construction Resources Institute, volume 1, issue 1, 2013, Pages 1~7
DOI : 10.14190/JRCR.2013.1.1.001
This study was on leaching test(KSLT, TCLP) of the aggregate for the products(RA-1) and for the site(RA-2) to evaluate the characteristics of contaminants and the possibility of contamination arising from the aggregate. On the basis pH, conductivity and heavy metal contents in the aggregate, RA-1 indicated higher than RA-2. As a result of the leaching test, the pollutants were eluted from the aggregate increased as the particle size of the aggregate was smaller. The pH in the aggregate had a strong alkali by a pH value of 9.0~12.3, the conductivity was higher in less than 10mm RA-1 due to the leaching of dissolved inorganic ions. The heavy metals satisfied the leaching standards of KSLT and less 10% was eluted from the aggregate. As a result of evaluating water pollution possibility of the aggregate, the pH displayed in items with a very high possibility of contamination, conductivity and turbidity did in item with a low possibility of contamination and on the other hand the heavy metals did in item with a very low possibility of contamination.
Evaluation of Performance Based Design Method of Concrete Structures for Various Climate Changes
Kim, Tae-Kyun ; Shim, Hyun-Bo ; Ahn, Tae-Song ; Kim, Jang-Ho Jay ;
Journal of the Korean Recycled Construction Resources Institute, volume 1, issue 1, 2013, Pages 8~16
DOI : 10.14190/JRCR.2013.1.1.008
Currently, global warming has advanced by the usage of fossil fuels such as coal and petroleum. and the atmosphere temperature in the world of 100 years(1906~2005) has been risen
, IPCC announced that the global warming effect of last decade was nearly doubled compared to the changes(
/10year) in the past 100 years. Moreover, due to the global warming, heat wave, heavy snow, heavy rain, super typhoon, were caused and are increasing to happen in the world continuously causing damages and destruction of social infrastructures, where concrete structures are suffering deterioration by long-term extreme climate changes. to solve these problems, the new construction technology and codes are necessary. In this study, to solve these problems, experiments on a variety of cases considering the temperature and humidity, the main factors of climate factors, were performed, and the cases are decided by temperature and humidity. The specimens were tested in compressive strength test and split tensile test by the curing age(3,7,28 days) morever, performance based design(PBD) method was applied by using the satisfaction curve developed from the experiment date. PBD is the design method that gathers the current experimental analysis and past experimental analysis and develops the material properties required for the structure, and carries out the design of concrete mix, and it is recently studied actively worldwide. Also, it is the ultimate goal of PBD to design and perform on structures have sufficient performance during usage and to provide the problem solving for various situations, Also, it can achieve maximum effect in terms of functionality and economy.
Application of PCM Technology to Concrete II : Effects of SSMA(Sulfonated Styrene-Maleic Anhydride) on the Properties of the 1-Dodecanol Micro-Capsule
Shin, Se-Soon ; Jung, Jae-Yun ; Lim, Myung-Kwan ; Choi, Dong-Uk ; Kim, Young-Ho ;
Journal of the Korean Recycled Construction Resources Institute, volume 1, issue 1, 2013, Pages 17~25
DOI : 10.14190/JRCR.2013.1.1.017
Thermal storage technology used for indoor heating and cooling to maintain a constant temperature for a long period of time has an advantage of raising energy use efficiency. This, the phase changing material, which utilizes heat storage properties of the substances, capsulizes substances that melt at a constant temperature. This is applied to construction materials to block or save energy due to heat storage and heat protection during the process in which substances melt or freeze according to the indoor or outdoor temperature. The micro-encapsulation method is used to create thermal storage from phase changing material. This method can be broadly classified in 3 ways: chemical method, physical and chemical method and physical and mechanical method. In the physical and chemical method, a wet process using the micro-encapsulation process utilized. This process emulsifies the core material in a solvent then coats the monomer polymer on the wall of the emulsion to harden it. In this process, a surfactant is utilized to enhance the performance of the emulsion of the core material and the coating of the wall monomer. The performance of the micro-encapsulation, especially the coating thickness of the wall material and the uniformity of the coating, is largely dependent on the characteristics of the surfactant. This research compares the performance of the micro-capsules and heat storage for product according to molecular mass and concentration of the surfactant, SSMA (sulfonated styrene-maleic anhydride), when it comes to micro-encapsulation through interfacial polymerization, in which Dodecan-1 is transformed to melamin resin, a heat storage material using phase changing properties. In addition, the thickness of the micro-encapsulation wall material and residual melamine were reduced by adjusting the concentration of melamin resin microcapsules.
Evaluation of Chloride Penetration in Concrete with Ground Granulated Blast Furnace Slag considering Fineness and Replacement Ratio
Lee, Hyun-Ho ; Kwon, Seung-Jun ;
Journal of the Korean Recycled Construction Resources Institute, volume 1, issue 1, 2013, Pages 26~34
DOI : 10.14190/JRCR.2013.1.1.026
Durability performance in RC structures varies significantly with changes in cover depth and mix proportions. GGBFS (Ground Granulated Blast Furnace Slag) is very effective mineral admixture and widely used for an improved resistance to chloride attack. In this paper, characteristics such as porosity, compressive strength, and diffusion coefficient are evaluated in GGBFS concrete with 30~70% of replacement ratio and
of fineness. Through the tests, more dense pore structure, higher compressive strength, and lower diffusion coefficient are obtained in GGBFS concrete, which are evaluated to be more dependent on replacement ratio than fineness. With increasing curing period from 3 to 91 days, porosity decreases to 77.47% and strength increases to 373% in GGBFS concrete. Chloride diffusion coefficient in GGBFS concrete decreases to 64.4% compared with that in OPC concrete, which shows significant improvement of durability performance.
Strength Development and Durability of Geopolymer Mortar Using the Combined Fly ash and Blast-Furnace Slag
Ryu, Gum-Sung ; Koh, Kyung-Taek ; Lee, Jang-Hwa ;
Journal of the Korean Recycled Construction Resources Institute, volume 1, issue 1, 2013, Pages 35~41
DOI : 10.14190/JRCR.2013.1.1.035
In this study, we investigated the strength development and durability of geopolymer mortar using blast furnace slag only, and admixed with blast-furnace slag and fly ash as cementious materials in oder to develop cementless geopolymer concrete. In order to compare with the geopolymer mortar, the normal mortar using ordinary portland cement was also test. In view of the results, we found out that strength development, the resistance to freezing-thawing of the geopolymer mortar have better than the mortar using ordinary portland cement. Especially, using the combined with blast furnace slag and fly ash develop high strength of above 60 MPa, and improve the resistance of freezing-thawing of approximately 20%, but promote the velocity of carbonation of 2.2~3.5 times.
A Case Study on CO
Uptake of Concrete owing to Carbonation
Yang, Keun-Hyeok ; Kim, Sang-Chel ;
Journal of the Korean Recycled Construction Resources Institute, volume 1, issue 1, 2013, Pages 42~48
DOI : 10.14190/JRCR.2013.1.1.042
The present study assessed the amount of
uptake owing to concrete carbonation through a case study for an apartment building with a principal wall system and an office building with Rahmen system under different exposed environments during use phase and recycling application. The
uptake assessment owing to concrete carbonation followed the procedure established by Yang et al. As input data necessary for the case study, actual surveys conducted in 2012 in Korea, which included data about the climate environments,
concentration, lifecycle inventory database, life expectancy of structures, and recycling activity scenario, were used. From the comparisons with the
emissions from concrete production, the
uptake during the lifetime of structures was estimated to be 5.5~5.7% and that during recycling activity after demolition was 10~12%; as a result, the amount of
uptake owing to concrete carbonation can be estimated to be 15.5~17% of the
emissions from concrete production, which roughly corresponds to 18-21% of the
emissions from cement production as well.
Evaluation of Domestic CCPs(Coal Combustion Products) Quality by API Test Method
Yoo, Sung-Won ; Yu, Kyung-Geun ; Cho, Young-Keun ;
Journal of the Korean Recycled Construction Resources Institute, volume 1, issue 1, 2013, Pages 49~57
DOI : 10.14190/JRCR.2013.1.1.049
Recently, recycling of industrial by-products and CO2 reduction have been important issues in the world. In this reason, applications and reuse of Fly ash as a binder for concrete, which is generated in thermoelectric power plant, have been one of the effective recycle methods. In order for Fly ash to be applied to concrete, Korean Standard(KS) has selected and managed quality such as
, fineness, specific gravity, ignition loss and activity index. However, there is a limits for activity index, whose test period required is at least 28 days or 91 days. Activity index is the critical indication standard to determine mechanical strength of concrete that contained Fly ash. To complement the disadvantage of test method, this research provided "API test method", which quickly measure Pozzolanic reaction of Fly ash can be considered as a alternative of activity index. Then, the adaptable API test method need to be investigated through comparative analysis with the test result of API, activity index and K-value. The test method can make evaluation of Fly ash quality faster and more accurate. As a result, most Fly ash produced in Korea has not been satisfied in the KS quality standard except water content and specific gravity, and especially fluidized bed boiler ash has its characteristics. Also, API, activity index and K-value have superior interrelationship. The interrelationship between API and activity index and K-value gets increased as the material age gets higher, so API test can be considered as very useful test method for Pozzolanic reaction evaluation of Fly ash.
A Study on the Quality Properties of Alkali-activated cement free Mortar using Industrial by-products
Kwon, Yong-Hun ; Kwon, Yeong-Ho ; Lee, Dong-Gyu ;
Journal of the Korean Recycled Construction Resources Institute, volume 1, issue 1, 2013, Pages 58~66
DOI : 10.14190/JRCR.2013.1.1.058
This study investigated quality properties of alkali activated cement free mortar using industrial by-product such as cement kiln dust(CKD), silica fume(SF) and quartz sand powder(SP) to compare with previous research about blast furnace slag(BS) and fly ash(FA). The results were as following. All materials were effective to increase compressive strength, however they showed different tendency on flowability. CKD and SP increased flowability, but on the other hand SF did not because it's blain was great difference with other materials. Flowability and compressive strength were related with grading distributions of binders because CKD, SP and SF which had small particle size filled up BS and FA. Application of industrial by-products with various grading distributions could be effective for the high early strength and flowability of alkali activated cement free mortar using BS.
A Study on the Quality Properties of Exposed High Fluidity Concrete using Fly Ash and Limestone Powder
Choi, Yun-Wang ; Oh, Sung-Rok ; Kim, Ji-Hoon ; Kim, Kyung-Hwan ;
Journal of the Korean Recycled Construction Resources Institute, volume 1, issue 1, 2013, Pages 67~75
DOI : 10.14190/JRCR.2013.1.1.067
Recently, the interest is increasing about the exposed concrete, accordingly, exposed concrete is expanding the use. However, concrete structures is difficult to apply the general concrete for exposed concrete, due to complex section and compact reinforcement, increasingly. Therefore, in this paper, for application of high fluidity concrete as exposed concrete, exposed high fluidity concrete using fly ash and lime stone powder was manufactured and observed quality property(fluidity properties, mechanical properties and Surface Properties) of exposed high fluidity concrete. The experiments are based on the OPC and LSP10, was evaluated Impact on the quality of concrete according to mixing ratio of FA(0, 10, 15 and 20). As a result, fluidity properties, mechanical properties and Surface Properties of exposed high fluidity concrete were satisfied to requirement conditions, fluidity and surface finishability was improved depending on mix of fly ash and limestone powder. Through this, we utilize of basic research data for development of high fluidity concrete for exposed concrete.