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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 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
Analytical Estimation of the Performance of Marine Concrete with Mineral Admixture
Lee, Bang-Yeon ; Kwon, Seung-Jun ; Kang, Su-Tae ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 301~306
DOI : 10.14190/JRCR.2015.3.4.301
For the purpose of developing high performance marine concrete with improved crack resistance and durability, this analytical study aimed to estimate strength, hydration heat characteristics, and chloride attack resistance of concrete with mineral admixture. Ground granulated furnace slag and fly ash were considered for mineral admixture. The replacement of ground granulated furnace slag and fly ash considered in the analysis was in the range of 0~70% and 0~40 %, respectively. The analysis results indicated that both ground granulated furnace slag and fly ash decreased compressive strength, and the effect of adding ground granulated furnace slag on mitigation of hydration heat was limited whereas fly ash had an noticeable influence on it. It was also found that the replacement with ground granulated furnace slag enhanced the chloride attack resistance but fly ash deteriorated the resistance. From the analytical studies, It could be expected that a ternary blended cement composition with proper amount of ground granulated furnace slag and fly ash might be effective to control crack resistance as well as chloride attack resistance of marine concrete.
The Strength and Length Change Properties of Recycled Aggregate Concrete(RAC) by Compressive Strength Levels
Lee, Bong-Chun ; Lee, Jun ; Cho, Young-Keun ; Jung, Sang-Hwa ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 307~312
DOI : 10.14190/JRCR.2015.3.4.307
This paper addresses mechanical properties and length change performance of the recycled aggregate concretes(RAC) in which natural coarse was replaced by recycled coarse aggregate(RCA) by compressive strength levels(20, 35, 50 MPa). A total of 9 RAC were produced and classified into three series, each of which included three mixes designed with three compressive strength levels of 20 MPa, 35 MPa and 50 MPa and three RCA replacement ratios of 0, 50 and 100%. Physical/Mechanical properties of RAC were tested for slump test, compressive strength, and length change. The test results indicated that the workability of RC could be improved or same by RCA replacement ratios, when compared with that containing no RCA. This is probably because of the RCA shape improving the workability of RAC. Also, the test results showed that the compressive strength was decreased by 9~10% as the RCA replacement ratios increase. However, the length change ratio by the RCA replacement ratios increased regardless of compressive strength levels. At 20 MPa level, the length change ratio was 8~40% which was much higher than that of 4~17% at both 35 and 50 MPa levels. Therefore, it was considered that such admixture addition preventing dry shrinkage is required in order to improve the properties of the RAC at 20 MPa level.
Study on Semi-Dry Process Developement of BP's Sludge by Non-Heating Manufacture Method
Kim, Byeong-Ki ; Kim, Jae-Hwan ; Kang, Seok-Pyo ; Kang, Hye-Ju ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 313~319
DOI : 10.14190/JRCR.2015.3.4.313
This study relates to an investigation into semi-dry manufacturing process of BP sludge based on non-heating production method. In this study, we conducted a research into reduction of water content ratio which arose from mixture of BP by-products of high water content ratio(50% or higher) with industrial by-products to use such BP by-products as construction materials in large quantity. We measured the reduction rate of water content ratio at the feeding ratio of water content reduction agent(1:0.5) in BP by-products. The results showed that water content ratio was the lowest with 18.5% in the mixture of PA+CFA(1:0.5). Moreover, water content ratio ranged between approximately 9.2% and 11.4% at the age of 1 day to 2 days at the aging temperature of
, suggesting that the water content ratio was in the range within 10% which was a level suitable for use as construction material in this study. Meanwhile, we compared and evaluated the physical properties of non-heated BP by-products based on post-aging pulverization method. The results showed that there was no significant difference, depending on pulverization method. When production efficiency and economic feasibility were taken into consideration, it was found desirable to use fine particle pulverizer or pin mill enabling continuous production.
Suggestion for Concrete Strength Grade Using Ultrasonic Velocity for Tunnel Lining Concrete
Kang, Su-Tae ; Lee, Bang-Yeon ; Kwon, Seung-Jun ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 320~327
DOI : 10.14190/JRCR.2015.3.4.320
This study implicates a quality evaluation technique for lining concrete using the ultra-sonic technique and proposed a classification for quality evaluation. From the comparison of test results, an improved result comparable to the results by destructive test can be obtained by using averaged transmission velocity of velocities obtained at pure space and central space between two sensors of ultrasonic tester. It is also shown that strength evaluation by ultra-sonic method is not reliable and an evaluation according to the transmission velocities can be improved method for the strength evaluation of concrete.
Physical Properties of Light Weight Foamed Glass Using Waste Glass Powder and Fly Ash
Song, Hun ; Shin, Hyeon-Uk ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 328~334
DOI : 10.14190/JRCR.2015.3.4.328
Building insulation materials use for the purpose of energy saving. Insulation materials can be classified inorganic and organic insulation materials. Inorganic insulation is used for fire resistive performance parts and organic insulation is used for thermal performance parts. Meanwhile, organic insulation is due to toxic gas emission in fire. Inorganic insulation is too heavy and low thermal performance than organic materials. This study is focused on evaluation of the physical properties of inorganic foam material using industrial by-products such as waste glass powder and fly ash. From the test result, inorganic foam materials for the applicability of fire-resistance and insulation light-weight materials.
An Experimental Study on High Strength Concrete Using the LCD Waste Glass Powder
Kim, Byung-Chul ; Cha, Tae-Gweon ; Jang, Pan-Ki ; Kim, Chan-Woo ; Jang, Il-Young ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 335~341
DOI : 10.14190/JRCR.2015.3.4.335
Various display devices has been increasing also using waste LCD glass in accordance with the used developed, because circumstances that are most landfill or incineration, are needed research on recycling measure of the using waste LCD glass. Therefore, in this study, to try to assess the basic mechanical properties of concrete mixed with using waste LCD glass micropowder through the room mixed test. According to the study results, the more replacement rate increases, the characteristics of the concrete showed a tendency to decrease slightly. However, according to the small value, it is expected to improve the advanced experimental values by refining the grain size of the materials used to be processed into spheres.
Mechanical Properties of Lightweight Mortar in Accordance with the Particle Size and Replacement Ratio of the Wasted Tire Chip
Yang, Hun ; Lee, Yong ; Lee, Sang-Soo ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 342~347
DOI : 10.14190/JRCR.2015.3.4.342
This study is basic experiment which prevents indiscriminate reclamation and recycles the wasted tire in order to solve environmental pollution according to generation rate of the wasted tire from recently industrial development. By applying as the substitute material of the lightweight aggregate among the constructional materials in order to evaluate the lightness of the wasted tire chip and suggest the recycling plan of the wasted tire chip. The prior experiment did the replacement ratio of the wasted tire with 20%, 40%, 60%, 80%, 100%, etc. and made a study on the strength and density properties. Based on the prior experiment of wasted tire, the replacement ratio was fixed at 15, 20, 25%, particle size of wasted tire was fixed at 0.2, 0.8, 1~2, 3~5, 5~7(mm). As a result, it is supposed that the best replacement ratio and particle size are 15% and 1~2mm, respectively.
A Study on Property with Ratio of Water Mixture in Hydroponic Polyurethane Waterproofing Materials
Park, Jin-Sang ; Park, Wan-Goo ; Kim, Dong-Bum ; Lee, Min-Kyu ; Oh, Sang-Keun ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 348~354
DOI : 10.14190/JRCR.2015.3.4.348
Urethane waterproofing materials which currently being used most commonly in the Korean domestic market have high applicability and construct layers without forming any joints, but under the influence of low temperature and low humidity, as well as the thickness of the applied layer, the curing time of this material may become extended in construction sites. To resolve these issues, a proposed method of using water-hardening type of polyurethane waterproofing materials are being developed. However, there currently lacks any standards or evaluation methods on determining an optimal mixture ratio of water for the water-hardening polyurethane waterproofing materials. Therefore, workers and construction workers are relying on their hands-on-skills and experience to determine this ratio and are not able to obtain a consistent performance quality out of these materials. Therefore, for the establishment of a board applicability of the water-hardening polyurethane waterproofing methods in construction sites, this study objectively analyzes the changes in the performance of these materials depending on the changes of the water mixture ratio and attempts to procure the optimal ratio on the basis of forming a provisionary standard. The study prepares mixtures of varying ratio(no water added, 5, 10, 15, 20, 25, 30, 40 and 50) and conducts comparative analysis respective mixtures' performances and their changes in the physical properties in an objective manner and proposes a provisional optimal value that can serve as a data base that can be used as a reference for future studies.
Properties of Cementless Loess Mortar Using Eco-Friendly Hardening Agent
Jung, Yong-Wook ; Kim, Sung-Hyun ; Lee, Dong-Gyu ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 355~365
DOI : 10.14190/JRCR.2015.3.4.355
This study examined the fluidity and strength properties, water resistance, durability, and freeze-thaw of cementless loess mortar using an eco-friendly hardening agent. The experimental result indicates that 28 days compressive and flexural strength of the loess mortar was increased regardless of the weathered granite soil and loess mixture ratio as the replacement ratio of the hardening agent increases. The strengths were significantly increased until 14 days regardless of the hardening agent, while the effect on the strengths increasement was relatively low after 14 days. Thus, the strength development of loess mortar concrete was found to be faster than that of the normal concrete. In addition, when the hardening agent of 10% was used, the average flexural strength was 1.7MPa which is insufficient compared to the 28-day flexural strength of 4.5MPa for the paving concrete. However, the flexural strengths of the loess mortar concrete using the hardening agents of 20% and 30% were 4.0MPa and 5.3MPa, respectively. Thus, the hardening agent need to be at least 20% so that the loess mortar can be used for paving concrete. The experiment for water resistance shows that the repeated absorption and dry reduced mass regardless of the mixing ratio of the loess. The maximum length change also decreased with increasing the substitution rate loess mixture ratio and the hardening agent. The result of the freeze-thaw resistance test indicates that the relative dynamic modulus of elasticity at 300 cycle freeze-thaw with the hardening agents of 20% and 30% were 75% and 79%, relatively. Thus, the hardening agent of at least 20% is required to obtain the relative dynamic modulus of elasticity of 60% for the loess mortar.
Study on Performance of pH Reducing Agent Applied for Wet Process of Recycled Aggregate
Choi, Jung-Gu ; Lee, Gun-Cheol ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 366~373
DOI : 10.14190/JRCR.2015.3.4.366
Construction waste is recycled and used for the efficient and eco-friendly disposal of construction waste increasing due to reconstruction and redevelopment project and so on. There is recycled aggregate as a typical case. And this recycled aggregate shows strong alkalinity due to calcium hydroxide, and causes many environmental problems. Therefore, this is a study on reduction in the strong alkalinity of recycled aggregate by using sodium phosphate based ammonium in order to reduce the pH of recycled aggregate. Besides, a possibility that a pH reducing agent of recycled aggregate could be applied to a site was evaluated. As a result, it was possible to verify that pH decreased as the percentage of pH reducing agent increased. It is thought that the pH reducing agent can be applied to a site by methods such as immersion and spray using the pH reducing agent in the process of producing recycled aggregates.
Properties of Fire Resistant Finishing Mortar Using Fly Ash and Glass Forming Light Weight Aggregate
Song, Hun ;
Journal of the Korean Recycled Construction Resources Institute, volume 3, issue 4, 2015, Pages 374~381
DOI : 10.14190/JRCR.2015.3.4.374
This study is investigating the fire resistant finishing materials composed of fly ash and glass forming light weight aggregate has the high temperature thermal stability. High temperatures such as a fire, cementitious materials beget dehydration and micro crack of cement matrix. From the test result, developed fire resistant finishing materials showed good stability in high temperatures. These high temperature stability is caused by the ceramic binding and low thermal conductivity of glass forming light weight aggregate. Also, alkali activation reaction of fly ash and meta kaolin not showing the decomposition of calcium hydrates. Thus, this result indicates that it is possible to fire resistant finishing light weight mortars.