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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Recycled Construction Resources Institute
Journal Basic Information
Journal DOI :
Korean Recycled Construction Resource Institute
Editor in Chief :
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
Physical Properties of Mineral Hydrate Insulation Used Desulfurization Gypsum
Park, Jae-Wan ; La, Yun-Ho ; Chu, Yong-Sik ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 291~296
DOI : 10.14190/JRCR.2014.2.4.291
For the purpose of energy consumption and green-house gas reduction from building, new insulation materials with improved thermal property have been developed and used. Among new insulation materials, mineral hydrate which compensates for the defects of existing materials is using as a prominent insulation material. The fabrication method of mineral hydrate is similar to that of ALC for building structure but mineral hydrate is only used for insulation. The raw materials that make up of mineral hydrate are cement, lime and anhydrite. Especially anhydrite is all dependant on imports. In this study, Desulfurization Gypsum(DG), by-product of oil plant, was used for replacing for imported anhydrite and waste recycling. DG substituted all of anhydrite and a part of lime. Mineral hydrate used DG had analogous thermal and physical properties, compared to existing mineral hydrate.
Durability Enhancement in Nano-Silica Admixed Reinforced Mortar
Saraswathy, Velu ; Karthick, Subbiah ; Kwon, Seung-Jun ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 297~306
DOI : 10.14190/JRCR.2014.2.4.297
Recently nano-materials are gaining more importance in the construction industry due to its enhanced energy efficiency, durability, economy, and sustainability. Nano-silica addition to cement based materials can control the degradation of the fundamental calcium-silicate-hydrate reaction of concrete caused by calcium leaching in water as well as block water penetration and therefore lead to improvements in durability. In this paper, the influence of synthesized nano silica from locally available rice husk on the mechanical properties and corrosion resistant properties of OPC (Ordinary Portland Cement) has been studied by conducting various experimental investigations. Micro structural properties have been assessed by conducting Scanning Electron Microscopy, Thermo gravimetry and Differential Thermal Analysis, X-Ray Diffraction analysis, and FTIR studies. The experimental results revealed that NS reacted with calcium hydroxide crystals in the cement paste and produces Calcium Silicate Hydrate gel which enhanced the strength and acts as a filler which filled the nano pores present in concrete. Hence the strength and corrosion resistant properties were enhanced than the control.
A Study on the Temporal Correlation of Long-term Exposure Test and Accelerated Corrosion Test of Rebar
Lee, Min-Woo ; Park, Sang-Soon ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 307~313
DOI : 10.14190/JRCR.2014.2.4.307
Recent interest in the increased structural performance and durability evaluation of this concrete structure in a salt damage environment is increasing. The most secure and reliable method of accelerated corrosion test is a method to carry out the rebar corrosion monitoring can be exposed directly to the marine test site exposure. However, long-term exposure testinghas the disadvantage that a long period is necessary. So, a lot of research on RC of salt damage environment have beenpromoted as alternatives to replace this. However, accelerated corrosion test, in the short term only is appropriate and is but an accelerated test method to evaluate the critical chlorine concentration, there is a difficult problem that you still get the answer. It is one of the correlation problems accelerated test correspond to a certain period of exposure environment. Therefore, in this study, to clarify the differences rebar corrosion beginning, through the actual corrosion accelerated test in corrosion time and laboratory test chamber of the structure of the marine environment results in both environments, it is an object of correlation coefficient derived.
Image and Phase Analysis of Low Carbon Type Recycled Cement Using Waste Concrete Powder
Song, Hun ; Shin, Hyeon-Uk ; Lee, Jong-Kyu ; Chu, Yong-Sik ; Park, Dong-Chan ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 314~320
DOI : 10.14190/JRCR.2014.2.4.314
Although the cement industry serves as the cornerstone of the construction industry by supplying one of its fundamental materials, it confronts new environmental challenges due to the problem of the
generated from raw materials and fuel used in the cement manufacturing process. Also, concrete structures can be decomposed and reused as construction materials. Simply in terms of the cyclic processing of
, recycling waste concrete to manufacture recycled aggregate or recycling waste concrete powder, which is the material for cement can be considered optimally environment-friendly practices. This study contributes to the aim of manufacturing high value added materials that exploits the chemical properties of the waste concrete powder. From the research results, waste concrete powder is feasible to use to produce low carbon type recycled cement.
Relation Between Water Content Ratio and Fire Performance of Class 1 Structural Light Weight Aggregate Concrete
Song, Hun ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 321~327
DOI : 10.14190/JRCR.2014.2.4.321
Structural light weight aggregate concrete are made with both coarse and fine light weight aggregates, but it is common with the high strength concrete to replace all or part with normal weight sand be called class 1 structural light weight aggregate concrete. Fire resistance of structural light weight aggregate concrete are determined by properties of high water content ratio and explosive spalling. Especially, structural light weight aggregate concrete is occurred serious fire performance deterioration by explosive spalling stem from thermal stress and water vapor pressure. This study is concerned with experimentally investigating fire resistance of class 1 structural light weight concrete. From the test result, class 1 structural light weight concrete is happened explosive spalling. The decrease of cross section caused by explosive spalling made sharp increasing gradient of inner temperature.
Properties of Portland Cement Clinker Using Polysilicon Sludge
Lee, Seung-Heun ; Lee, Se-Jin ; Woo, Yang-Yee ; Park, Jeoung-Soo ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 328~334
DOI : 10.14190/JRCR.2014.2.4.328
This study reviewed the usability of sludge, a material that is additionally created when polysilicon (a solar light material) is produced, as the raw material for cement clinker. It was evaluated that when cement clinker is produced, the chloric component of polysilicon acted as a mineralizer in the firing process. In addition, the physical features of the produced cement were measured. The setting time of the produced cement was reduced as the amount of content of polysilicon sludge increased. Such results were drawn because the chloric component acted as hydration accelerator and enhanced the dissolution of calcium hydroxide that was formed by hydration of
. Furthermore, for such reason, on the day 1, the compression strength of mortar increased as the content of polysilicon sludge increased. In day 3, 7, and 28, the tendency in which the compression strength increasing up to 5% of the amount of added polysilicon sludge was shown. It is because when clinker was produced, the chloric component increased the amount of
mineral created, thus enhancing the compression strength after day 3.
An Experimental Study on the Quality of Concrete with Municipal Solid Waste Incineration Ash
Kim, Jae-Woo ; Choi, Jae-Jin ; Moon, Dae-Joong ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 335~344
DOI : 10.14190/JRCR.2014.2.4.335
The Quality of municipal solid waste incineration ash (incineration ash) was analyzed for the purpose of the reusing for concrete material. The folwability and strength properties of concrete mixed with incinerator ash were investigated. CaO component was included more than 50% in chemical component of incinerator ash, mean size of 50% accumulated particle distribution of incinerator ash was about
. Particle shape of incinerator ash (
) was massed the round shape with fine particle, particle shape of incinerator ash (
) was piled up the sheet shape according to manufacture procedure. The Quality of concrete was effected by use of incinerator ash. When the incinerator Ash (
) was used, slum of concrete was increased and dosage of high range water reducing agent was reduced. However, strength development of concrete was decreased. Dosage of high range water reducing agent was increased by combined use of incinerator ash (
) and diatomite powder, but strength development of concrete was improved. Ratio of compressive strength and tensile strength was in the range 85%~105% of CEB-FIP model code.
The Experimental Study on the Fluidity Properties of Mortar Using Basalt Fiber and High Volume Fly Ash
Choi, Yun-Wang ; Oh, Sung-Rok ; Park, Man-Seok ; Choi, Byung-Keol ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 345~353
DOI : 10.14190/JRCR.2014.2.4.345
This study was evaluated influence of fluidity properties according to basalt fiber and high volume fly ash in the mortar level, as part of a basic study for development of fiber reinforced concrete using basalt fiber and high volume fly ash. In the first step, it was evaluated that fluidity properties of mortar according to replacement ratio 6 level of fly ash(10, 20, 30, 40, 50 and 60mass%) and fluidity properties of mortar according to content 5 levels of SP(1.3, 1.5, 1.7, 1.9 and 2.1%) and content 5 levels of VA(0.2, 0.4, 0.6, 0.8 and 1.0%) for dispersion of the basalt fiber, in the second step, it was evaluated that fluidity properties of mortar using High-volume fly ash (50mass%) on 3 levels of basalt fiber length (6, 20 and 30mm). Results of assessment, if after a fiber mixed, it showed that viscosity agent is more effective to improve the fluidity and fiber dispersion than superplasticizer, high volume fly ash (50%) applying the mixing, due to three properties of fly ash, showed that the improved fiber dispersibility and flow improvement.
Evaluation on Fatigue Performance in Compression of Normaland Light-weight Concrete Mixtures with High Volume SCM
Mun, Jae-Sung ; Yang, Keun-Hyeok ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 354~359
DOI : 10.14190/JRCR.2014.2.4.354
The objective of this study is to examine the fatigue behavior in compression of normal-weight and lightweight concrete mixtures with high volume supplementary cementitious material(SCM). The selected binder composition was 30% ordinary portland cement, 20% fly-ash, and 50% ground granulated blast-furnace slag. The targeted compressive strength of concrete was 40 MPa. For the cyclic loading, the constant maximum stress level varied to be 75%, 80%, and 90% of the static uniaxial compressive strength, whereas the constant minimum stress level was fixed at 10% of the static strength. The test results showed that fatigue life of high volume SCM lightweight concrete was lower than the companion normalweight concrete. The value of the fatigue strain at the maximum stress level intersected the descending branch of the monotonic stress-strain curve after approximately 90% of the fatigue life.
Effect of Types and Replacement Ratio of Alkali Activator on Compressive Strength of Ground Granulated Blast Furnace Slag Mortar
Kim, Rae-Hwan ; Kim, Gyu-Yong ; Kim, Jong-Hee ; Lee, Bo-Kyeong ; Cho, Bong-Suk ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 4, 2014, Pages 360~366
DOI : 10.14190/JRCR.2014.2.4.360
In this study, effect of types and replacement ratio of alkali activator on compressive strength of ground granulated blast furnace slag mortar has been reviewed. Types of alkali activator are NaOH,
, and KOH. Replacement ratio of alkali activator is 7.5, 10, 12.5, and 15%, respectively. As results, under high temperature curing condition, 1 day compressive strength development with NaOH and KOH was higher than that of
. Regardless of types of alkali activator, compressive strength increased with increasing pH. This can be explained by the fact that impermeable film on the surface of slag which is generated when slag contacts water has been destroyed by alkali activator, and this promotes hydration reaction. Also, 1 day age compressive strength of specimen with high temperature curing was higher than that of specimen with standard curing. 28 days age compressive strength of specimen with high temperature curing was less than or equal to that of specimen with standard curing.