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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 4, Issue 2 - Jun 2016
Volume 4, Issue 1 - Mar 2016
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Evaluation on the Applicability of Recycled Fine Aggregate to Precast Concrete Products
Kim, Sang-Chel ; Park, Do-Kuk ; Yoog, Keun-Chang ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 1~9
DOI : 10.14190/JRCR.2016.4.1.001
While the amount of construction waste has not been changed much in discharge for last 10 years, the recycled resources refined from construction waste have been mainly applied to low-leveled one such as reclamation, back-fill, road base or subbase and so on. Thus this study addresses the applicability of recycled fine aggregate as a replaceable material in precast concrete. To evaluate the possibility, both of dry and wet processes were adopted as well as steam curing, widely used in the field for rapid producing. Most important experimental parameters were driven through preliminary experiments and were evaluated in terms of concrete properties. It is found from aggregate-replacement tests that all of consistency and strengths of concrete were decreased as the ratio of recycled fine aggregate increased, and the amount of decrease can be estimated using proposed equations. Though the recycled fine aggregate showed a decrease of concrete properties more or less, the applicability in large volume as a constituent of precast product was well noted from experimental results.
Service Life Evaluation of RC Column Exposed to Carbonation Considering Time-dependent Crack Pattern
Kwon, Seung-Jun ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 10~18
DOI : 10.14190/JRCR.2016.4.1.010
RC(Reinfored Concrete) structures exposed to carbonation in urban city have durability degradation with extended service life and cracks in concrete causes a local accelerated carbonation. In the present work, crack effect on carbonation depth is investigated and the service life of RC structure is evaluated considering cracks from early age and time-dependent cracks based on the previous field investigation. DFP(Durability Failure Probability), safety index, and the related service life are calculated considering the time to crack width reaches to maximum crack width(0.3mm). The results with time effect on crack width show lower DFP and longer service life, which seems to be reasonable compared with conservative results from crack effect from initial stage. Furthermore, crack effect is evaluated to be insignificant on DFP and service life. The technique with time-dependent crack effect on carbonation can be effectively used for RC structure containing cracking in use.
Bond Behavior of Concrete According to Replacement Ratio of Fly Ash and Compressive Strength of Concrete
Lee, Hyung-Jib ; Suh, Jeong-In ; Yoo, Sung-Won ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 19~24
DOI : 10.14190/JRCR.2016.4.1.019
Several researches on high volume fly ash concrete have been conducted to investigate its fundamental material properties such as slump, strength and durability and however, research on the structural behavior of bond strength is essential for the application of this high volume fly ash concrete to structural members because of the necessity of reinforcement. But the exact design code for application and researches on the bond behavior of high volume fly ash concrete lack yet. To achieve such a goal, this paper evaluates experimentally the bond behavior of high volume fly ash concretes by direct pull-out test and compares between the current test results and existing research results. By the test results, it is shown that the bond behavior of high volume fly ash concrete is similar to that of general concrete. And by the comparison between test and existing research, it is shown that bond stress of high volume fly ash concrete is underestimated, as the embedment length gets longer.
Compressive and Tensile Behavior of Polyetylene Fiber Reinforced Composite According to Silica Sand and Fly Ash
Kwon, Seung-Jun ; Kang, Su-Tae ; Choi, Jeong-Il ; Lee, Bang-Yeon ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 25~30
DOI : 10.14190/JRCR.2016.4.1.025
The purpose of this study is to investigate experimentally the effect of reinforcement of polyetylene fiber, inclusion of silica sand, and replacement of cement with fly ash on the compressive and tensile behavior of fiber reinforced composite. Five types of mixture proportions were determined and compressive strength and uniaxial tension tests were performed. Test results showed that strength, ductility, and control of cracking were improved by the reinforcement of fiber. Although the strength was improved by the inclusion of dried silica sand, the ductility was reduced and the crack width was increased. On the other hand, the increase of ductility, the decrease of crack width, and the decrease of strength were observed by the replacement of cement with fly ash.
Current Effective Recycling and Application Methods in Construction Waterproofing Industries
Park, Jin-Sang ; Kim, Sun-Do ; Park, Wan-Goo ; Kim, Dong-Bum ; Lee, Jong-Yong ; Oh, Sang-Keun ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 31~37
DOI : 10.14190/JRCR.2016.4.1.031
This paper intends to analyze the roles of regulations and certifications within the construction market that affect the effective recycling and application methods of construction waterproofing industries. Certifications, eco-labels, green certification patents, and new excellent technologies obtained in construction waterproofing industries are studied. In accordance to the study results, it was determined that, a total of 38 items obtained eco-labels with effective recycling as the theme, 10 items with green certifications, and 8 items with New Excellent Technologies. Regarding the types of effective recycled resources, most of them were concerned with composite-polymer(EVA, PVC, etc.) materials, waste tire powder, waste rubber, etc., which indicated that there is a clear limitation in the variety of the materials that are eligible for effective recycling in the construction waterproofing industries.
Effects of Diameter of Cylinder and the Number of Strand on the Bleeding of Cement Paste
Lee, Jung-Soo ; Koh, Kyung-Teak ; Ahn, Gi-Hong ; Kang, Su-Tae ; Kwon, Seung-Hee ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 38~46
DOI : 10.14190/JRCR.2016.4.1.038
In this study, the bleeding tests were performed to investigate the effects of cement paste(w/c
Effect of the Combination of Point Loads on the Design Flexural Capacity for Fiber Reinforced Concrete Floor Slab
Lee, Jong-Han ; Cho, Baik-Soon ; Kim, Jung-Sik ; Cho, Bum-Gu ; Ki, Han-Sik ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 47~54
DOI : 10.14190/JRCR.2016.4.1.047
In this study, the flexural capacity of fiber reinforced concrete floor slabs were evaluated using main design loads, racking and moving loads. Based on design standards and guidelines, the magnitude and loaded area of each load were determined, and its relationship was assessed. For the application of a single load, flexural capacity should be evaluated in the edge of a floor slab. In addition, the slab with thickness and concrete strength, greater than 180mm and 35MPa, respectively, sufficiently satisfied flexural capacity with a minimum of equivalent flexural strength ratio. The combination of racking loads required the largest equivalent flexural strength ratio to satisfy the flexural capacity of the floor slab. The combination of racking and moving loads showed equivalent flexural strength ratio smaller than the case of combination of racking loads, but larger than the application of single racking or moving loads. The results of this study indicated that the flexure of fiber reinforced concrete floor slabs should be designed using the combination of design loads.
A Study on Characteristics of Waste Mixed Soil in Landfill
Park, Tae-Soon ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 55~61
DOI : 10.14190/JRCR.2016.4.1.055
This paper presents the geotechnical characteristics of the soil mixed with various waste(waste soil) in the landfill. The physical and mechanical tests were conducted to find out the waste soil. The tests include the gradation, consistency tests, shear and compression and the consolidation tests using both the Rowe cell and the constant ration stress. The analyses of the test results show the waste soil belongs to the well graded sand(SW) in the laboratory and sand-gravel(SG) to fine sand(SF) in the field monitoring based on the unified classification soil system. The shear strength is increasing with increasing the shear displacement, however, the peak of the shear strength does not appear through the test and there is no distinct peak value of the strength obtained. The compression index(Cc) results in as increasing the amount of the sludge included and the compression index is proportional to the sludge included, which means more settlement is expected. The hydraulic conductivity of the waste soil ranges between
Experimental Study on the pH of Recycled Aggregate
Kim, Dae-Bong ; Kim, Jong-Hwan ; Park, Je-Chul ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 62~67
DOI : 10.14190/JRCR.2016.4.1.062
This study provides basic materials about setting pH standard of recycle aggregate by analysing pH change from elution time, type of solvent and ratio of solvent with existing experiment methods about recycle aggregate. Also it has purpose of evaluating impact of recycle aggregate outflow`s pH on actual environment by building a model that is similar to condition of recycling recycle aggregates. pH of recycle aggregates seemed to not change a lot by time with each experimental method. To evaluate degree of generation by recycle aggregates in natural state, natural water with distilled water seemed be useful to use as solvent. Also it was possible to confirm that there is a difference between actual pollution in natural state by only pH of recycle aggregates.
Mechanical Properties of an Open Graded Asphalt for Semi-rigid Pavement
Bang, Jin-Wook ; Kim, Yun-Yong ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 68~75
DOI : 10.14190/JRCR.2016.4.1.068
The present study evaluated the mechanical properties of open graded asphalt for semi-rigid pavements in order to determine the mixing proportion experimentally. A total twelve types of basic mixing proportions were set up and mechanical tests such as marshall stability, porosity, permeability, and cantabro loss were conducted based on Korean standards. From the tests results, it was found that the marshall stability in case of straight and modified asphalt increase up to the contents with 5.0% and 5.5% respectively. The porosity and permeability of asphalt tended to decrease as the asphalt contents increase, the coefficient of correlation between both were estimated 86%. The increase contents with asphalt range from 3.5% to 6.0% tended to decrease the cantabro loss and the modified asphalt enhanced the resistance of cantabro loss with range from 18.8% to 33.1% than straight asphalt under same asphalt contents. In comparison with test results and quality standards, it was concluded that the modified asphalt content of 4.5% is effective to adopt for open graded asphalt.
Compressive Strength Properties of Concrete Using High Early Strength Cement and Recycled Aggregate with Steam Curing Conditions
Kim, Yong-Jae ; Kim, Seung-Won ; Park, Cheol-Woo ; Sim, Jong-Sung ;
Journal of the Korean Recycled Construction Resources Institute, volume 4, issue 1, 2016, Pages 76~81
DOI : 10.14190/JRCR.2016.4.1.076
Recycled aggregate is a valuable resource in Korea in lack of natural aggregate. Government recognizes the importance and suggests various policies enhancing its use for higher value-added application. Most of recycled aggregate produced currently in Korea, however, is applied for low value-added uses such as embankment, reclamation, etc. Its higher valued application such as for structural concrete is very limited. Although domestic manufacturing technology of recycled aggregate is at the world level, recycled aggregate is not applied for structural concrete. Primary reasons for the limited use of the recycled aggregate include bonded mortar and cracks occurred during crushing and hence it is very difficult to predict and control the quality of recycled aggregate concrete. This research intended to grasp combined characteristics of recycled aggregate, high early strength cement, maximum temperature and time duration of steam curing and then, analyze the effects of factors. Also, it suggested the method to improve field applicability of recycled aggregate concrete.