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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Concrete Structures and Materials
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Journal DOI :
Korea Concrete Institute
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Volume & Issues
Volume 3, Issue 2 - Dec 2009
Volume 3, Issue 1 - Jun 2009
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Predicting Model for Pore Structure of Concrete Including Interface Transition Zone between Aggregate and Cement Paste
Pang, Gi-Sung ; Chae, Sung-Tae ; Chang, Sung-Pil ;
International Journal of Concrete Structures and Materials, volume 3, issue 2, 2009, Pages 81~90
DOI : 10.4334/IJCSM.2009.3.2.081
This paper proposes a semi analytical model to describe the pore structure of concrete by a set of simple equations. The relationship between the porosity and the microstructure of concrete has been considered when constructing the analytical model. The microstructure includes the interface transition zone (ITZ) between aggregates and cement paste. The predicting model of porosity was developed with considering the ITZ for various mixing of mortar and concrete. The proposed model is validated by the rapid experimental programs. Although the proposed model is semi-analytical and relatively simple, this model could be reasonably utilized for the durability design and adapted for predicting the service life of concrete structures.
Effects of Crushed RAP on Free and Restrained Shrinkage of Mortars
Topcu, Ilker Bekir ; Isikdag, Burak ;
International Journal of Concrete Structures and Materials, volume 3, issue 2, 2009, Pages 91~95
DOI : 10.4334/IJCSM.2009.3.2.091
Reclaimed asphalt pavement (RAP) is abundant substitute for natural aggregate in many areas. It is obtained by crushing of old road pavements in milling machine during rehabilitation and reconstruction process. In this study, reclaimed asphalt pavement mortars (RAPM) have been produced with different cement dosages and replacement ratios. The destructive and nondestructive tests have been conducted on specimens to determine physical and mechanical properties of RAPM. The free and restrained shrinkage tests on RAPM have been conducted to predict fractural behavior of mortars. The aim of the shrinkage tests was to delay crack formation and improve strain capacity of mortars before cracking. The results showed that RAPM exhibits lower elasticity modulus; however the tensile capacity was improved for deformation before cracking.
Improvement of Strength and Chemical Resistance of Silicate Polymer Concrete
Figovsky, Oleg ; Beilin, Dmitry ;
International Journal of Concrete Structures and Materials, volume 3, issue 2, 2009, Pages 97~101
DOI : 10.4334/IJCSM.2009.3.2.097
It has been known that acid-resistant concretes on the liquid glass basis have high porosity (up to 18
20%), low strength and insufficient water resistance. Therefore they can not be used as materials for load-bearing structural elements. Significant increasing of silicate matrix strength and density was carried out by incorporation of special liquid organic alkali-soluble silicate additives, which block of superficial pores and reduces concrete shrinkage deformation. It was demonstrated that introduction of tetrafurfuryloxisilane additive sharply increases strength, durability and shock resistance of silicate polymer concrete in aggressive media. This effect is attributable to hardening of contacts between silicate binder gel globes and modification of alkaline component owing to "inoculation" of the furan radical. The optimal concrete composition with the increased strength, chemical resistance in the aggressive environments, density and crack resistance was obtained.
Reliability-based Approach to Optimal Economic Estimation of Concrete Cover Thickness under Carbonation Environment
Do, Jeong-Yun ; Kim, Doo-Kie ; Song, Hun ; Jo, Young-Kug ;
International Journal of Concrete Structures and Materials, volume 3, issue 2, 2009, Pages 103~110
DOI : 10.4334/IJCSM.2009.3.2.103
Concrete carbonation is a cause of problems in concrete structures, so it needs to be estimated. And concrete cover is designed to protect structures from this damaging. Usually the cover thickness is considered based on the limit states design codes in which the important target is the reliability safety index. However, it is not clear that whether the safety index determined is optimal or not with respect to the cost. The codes are mainly proceeded quantitatively (i.e. making a safe structure) while the economic aspects are only considered qualitatively. So the reliability-based design considering life cycle cost (LCC) is called for, and here the focus is on the advanced analysis solution to optimize the reliability safety regarding LCC.
Fire Resistance Performance of FRP Rebar Reinforced Concrete Columns
Wang, Hui ; Zha, Xiaoxiong ; Ye, Jianqiao ;
International Journal of Concrete Structures and Materials, volume 3, issue 2, 2009, Pages 111~117
DOI : 10.4334/IJCSM.2009.3.2.111
Concrete columns reinforced with Fibre Reinforced Polymer (FRP) rebar have been increasingly used in civil engineering applications, while the research on fire resistance of such structural members is still very limited. In this paper, attempts are made to predict temperature distribution and mechanical performance of FRP rebar reinforced concrete columns in fire. The effect of concrete cover and section size on fire resistance time is studied by the finite element method. Based on a parametric study, a simple empirical formula to predict fire resistance time is proposed for possible adoption in fire resistance design.
High Performance Fiber Reinforced Cement Composites with Innovative Slip Hardending Twisted Steel Fibers
Kim, Dong-Joo ; Naaman, Antoine E. ; El-Tawil, Sherif ;
International Journal of Concrete Structures and Materials, volume 3, issue 2, 2009, Pages 119~126
DOI : 10.4334/IJCSM.2009.3.2.119
This paper provides a brief summary of the performance of an innovative slip hardening twisted steel fiber in comparison with other fibers including straight steel smooth fiber, high strength steel hooked fiber, SPECTRA (high molecular weight polyethylene) fiber and PVA fiber. First the pull-out of a single fiber is compared under static loading conditions, and slip rate-sensitivity is evaluated. The unique large slip capacity of T-fiber during pullout is based on its untwisting fiber pullout mechanism, which leads to high equivalent bond strength and composites with high ductility. Due to this large slip capacity a smaller amount of T-fibers is needed to obtain strain hardening tensile behavior of fiber reinforced cementitious composites. Second, the performance of different composites using T-fibers and other fibers subjected to tensile and flexural loadings is described and compared. Third, strain rate effect on the behavior of composites reinforced with different types and amounts of fibers is presented to clarify the potential application of HPFRCC for seismic, impact and blast loadings.
Effective Bond Length of FRP Sheets Externally Bonded to Concrete
Ben Ouezdou, Mongi ; Belarbi, Abdeldjelil ; Bae, Sang-Wook ;
International Journal of Concrete Structures and Materials, volume 3, issue 2, 2009, Pages 127~131
DOI : 10.4334/IJCSM.2009.3.2.127
Strengthening and repair of concrete structures using externally bonded fiber reinforced polymer (FRP) composite sheets has been popular around the world during the last two decades. However, premature failure due to debonding of the FRP is one of the important issues still to be resolved. Numerous research studies have dealt with the debonding problem in terms of Effective Bond Length (EBL), however, determination of this length has not yet been completely assessed. This paper summarizes previous works on the EBL and proposes a new relationship of the EBL with the FRP stiffness based on the existing experimental data collected in this study.