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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
A Fundamental Study for Development of Corrosion Inhibitor Repair Mortar
Jung, Jae-Eun ; Yang, Keun-Hyeok ; Go, Jeung-Wan ; Yun, In-Gu ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 93~99
DOI : 10.14190/JRCR.2014.2.2.093
The present study prepared 13 mixes to examine fundamental mixture proportions of corrosion inhibitor repair mortars. The mortar mixes were classified into three groups according to the selected test variables which are the substitution level of polymer for Group 1, ground granulated blast-furnace slag (GGBS) and fly ash (FA) for Group 2, and corrosion inhibitor for Group 3. Based on the test results, the optimum substitution levels of GGBS and FA could be recommended as 10% and 20%, respectively, though 1-day strength of mortar significantly decreased with their substitution. Furthermore, the appropriate substitution level of corrosion inhibitor was considered to be less than 1.5%. The flexural strength of mortar tested was higher than the predictions obtained from ACI 318-11 equation. The shrinkage strain of mortar was also conservative after an age of around 10 days compared with the predictions of ACI 209.
Study on the High Temperature Properties of Fireproof Mortar Using Various Types of Fine Aggregate
Lim, Seo-Hyung ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 100~106
DOI : 10.14190/JRCR.2014.2.2.100
High strength concrete has a structural advantage as well as superior usability and durability, so that its application in building is being steadily augmented. However, in the high temperature like in a fire, the high strength concrete has extreme danger named explosive spalling. It is known that the major cause of explosive spalling is water vapour pressure inside concrete. General solution for preventing concrete from spalling include applying fire protection coats to concrete in order to control the rising temperature of members in case of fire. The purpose of this study is to investigate the high temperature properties of fireproof mortar using organic fiber and various types of fine aggregate for fire protection covering material. The results showed that addition of perlite and polypropylene fiber to mortar modifies its pore structure and reduces its density. This causes the internal temperature to rise. As a results, it is found that a new fireproof mortar can be used in the fire protection covering material in high strength concrete.
Strength Development of the Concrete Incorporating Blast Furnace Slag and Recycled Aggregate as Alkali Activator
Kim, Jun-Ho ; Han, Min-Cheol ; Han, Cheon-Goo ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 107~114
DOI : 10.14190/JRCR.2014.2.2.107
The objective of this study is to evaluate the strength development of blast furnace slag concrete in response to the use of recycled aggregate as alkali activator. The influence of the amount of recycled aggregate was evaluated depending on different ratios of replacement for each RFA and RCA to NFA and NCA, respectively. The results indicated that as replacement of RFA and RCA increased, their strength exhibited to be increased. This was due to the fact that the latent hydraulic properties of blast furnace slag was activated by the alkali in recycled aggregates. However, in case of 365-days, it showed lower compressive strength than using NA(natural aggregates) which could be explained as the exhaustively use of alkali containing in RA. The specimens using RA showed about 90% of compressive strength comparing with specimens using NA.
Studies on the Performance of Self Healing of Plastic Cracks Using Natural Fibers in Concrete
Saraswathy, Velu ; Kwon, Seung-Jun ; Karthick, Subbiah ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 115~127
DOI : 10.14190/JRCR.2014.2.2.115
Addition of fibers in cement or cement concrete may be of current interest, but this is not a new idea or concept. Fibers of any material and shape play an important role in improving the strength and deformation characteristics of the cement matrix in which they are incorporated. The new concept and technology reveal that the engineering advantages of adding fibers in concrete may improve the fracture toughness, fatigue resistance, impact resistance, flexural strength, compressive strength, thermal crack resistance, rebound loss, and so on. The magnitude of the improvement depends upon both the amount and the type of fibers used. In this paper, locally available waste fibers such as coir fibers, sisal fibers and polypropylene fibers have incorporated in concrete with varying percentages and l/d ratio and their effect on compressive, split, flexural, bond and impact resistance have been reported.
Flexural Behavior of RC Beam Using High Volume Fly-Ash Cement
Ahn, Young-Sun ; Cha, Yeong-Dal ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 128~136
DOI : 10.14190/JRCR.2014.2.2.128
It is known that the best way to recycle fly ash is to use in concrete. It is impossible to bury in the ground this fly ash recently, so it is trying to use high volume fly ash concrete. Nevertheless, recent main research topics are focused in the part of material only. However, it is necessary to perform the researches about elasticity modulus, stress-strain relationship and structural behavior. Therefore, in this paper, 18 test members were manufactured with 3 test variables, namely fly ash replacement ratio 0, 35, 50%, concrete compressive strength 20, 40, 60MPa and 2 tensile steel ratio. 18 test members were tested for flexural behavior. From the test results, there were no differences between 35, 50% high volume fly ash cement concrete and ordinary concrete without fly ash (FA=0%). In order to evaluate the HVFAC flexural behavior, Analytical model was proposed and the computer program was developed. There were no differences between test results and analysis results. So, the proposed analytical model was reasonable.
The Optimal Mixing Design of the PHC Piles Utilizing the Air Cooled Blast Furnace Slag as Coarse Aggregate
Park, Yong-Kyu ; Kim, Hyun-Woo ; Kim, Seung-Il ; Hur, Kab-Soo ; Yoon, Ki-Won ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 137~144
DOI : 10.14190/JRCR.2014.2.2.137
The PHC pile utilizing the air-cooled blast-furnace slag as coarse aggregate was studied. This research was progressed with the range from the indoor mixing design evaluation into the actual goods production. The physical properties of the PHC pile are determined to satisfy through the appropriate mixing design adjustments. However, it should eliminate the aggregates including CaO and MgO in SG when it utilize in an AC (autoclave) type manufacturing process. It satisfied the bending moment, shear strength, and compressive strength of KS F 4306 except the surface states of the pile.
Evaluation of Quality Properties of Concrete according to Mixing Proportion of Finex Water Granulated Slag Fine Aggregate
Choi, Yun-Wang ; Cho, Bong-Suk ; Oh, Sung-Rok ; Park, Man-Seok ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 145~151
DOI : 10.14190/JRCR.2014.2.2.145
This paper evaluated the quality properties of Finex Water Granulated Slag fine aggregate as part of a study to recycle the Finex Water Granulated Slag generated in korea, and examined the availability as fine aggregate for concrete by comparing properties (properties of fresh concrete, mechanical properties of hardened concrete) of concrete using Finex Water Granulated Slag fine aggregate with properties of concrete using river sand as fine aggregate. From the results of this study, it was found that quality properties of concrete using finex water granulated slag as fine aggregate and concrete using river sand as fine aggregate are equivalent level.
Evaluation of Shrinkage of Heavyweight Magnetite Concrete with Fly Ash
Mun, Jae-Sung ; Yang, Keun-Hyeok ; Lee, Hyun-Ho ; Kim, Sang-Chel ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 152~157
DOI : 10.14190/JRCR.2014.2.2.152
The objective of this study is to examine the drying shinkage and autogenuous shrinkage strains of heavyweight magnetite concrete. As a main parameters, cement was partially replaced by fly ash (FA) from 5% to 35%. The measured shrinkage strains were compared with predictions obtained from CEB-FIP equations and Yang et al.'s model. Test results showed that the magnitite of the autogenous and total shrinkage strains of heavyweight concrete slightly increased as the amount of fly ash increases up to 15%, beyond which the strains tended to decrease. The CEB-FIP equations considerably underestimated the shrinkage behavior of heavyweight concrete, indicating that this trend was more notable with the age. On the other hand, Yang et al.'s model predicted accurately the shrinkage of heavyweight concrete.
Effects of Alkali-Activated Soil Stabilizer Binder Based on Recycling BP By-Products on Soil Improvement
Lee, Yeong-Won ; Kang, Suk-Pyo ; Kim, Jae-Hwan ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 158~165
DOI : 10.14190/JRCR.2014.2.2.158
The enormous quantity of 'Bayer-Process by-products' (BP by-products) discharged by industries producing alumina from bauxite represents an environmental and economical problem. As it is mainly composed of
, CaO and
, it is thought that using BP by-products as a construction material is an effective way to consume such a large quantity of alkaline waste. In this study, This study evaluates the effect of alkali-activated binder based on recycling BP by-products on soil improvement through the evaluation of slope stability and seepage flow numerical analysis. The results of analysis of ground slope safety at dry season and wet season meet standard (Ministry of Land, Infrastructure and Transport, 2006) Especially, when wet season, the ground used soil improving material meet standard, while the ground used soil-nailing method doesn't. Also, permeability coefficient of improved soil is smaller than that of natural soil and saturation depth of reinforced ground surface with improve soil is lower than that of natural soil.
Lightweight Properties of Matrix using Paper Ash according to Replacement Ratios of Fly Ash and Polysilicon Sludge
Park, Sun-Gyu ; Kim, Yun-Mi ; Lee, Sang-Soo ;
Journal of the Korean Recycled Construction Resources Institute, volume 2, issue 2, 2014, Pages 166~171
DOI : 10.14190/JRCR.2014.2.2.166
This experimental study considers manufacturing method of the non-portland cement matrix for the light-weight building materials using blast furnace slag, paper ash, fly ash and polysilicon sludge the industrial by-product. For the experiment, we used paper ash by means of the foaming agent and alkali activator to make non-portland cement light-weight matrix. Various specimens were prepared with different types and addition ratios of the alkali activator. Then, the properties of these specimens were investigated by compressive strength test, bulk specific gravity. As a results, it was judged that experiment results of non-portland cement matrix with specific waste resources and alkali activators were useful as basic data for mixtures design and evaluation properties of lightweight non-portland cement building material.