Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
International Journal of Concrete Structures and Materials
Journal Basic Information
Journal DOI :
Korea Concrete Institute
Editor in Chief :
Volume & Issues
Volume 4, Issue 2 - Dec 2010
Volume 4, Issue 1 - Jun 2010
Selecting the target year
Enhanced Classical Tafel Diagram Model for Corrosion of Steel in Chloride Contaminated Concrete and the Experimental Non-Linear Effect of Temperature
Hussain, Raja Rizwan ;
International Journal of Concrete Structures and Materials, volume 4, issue 2, 2010, Pages 71~75
DOI : 10.4334/IJCSM.2010.4.2.71
The chloride ion attack on the passive iron oxide layer of reinforcement steel embedded in concrete under variable temperature environment is influenced by several parameters and some of them still need to be further investigated in more detail. Different school of thoughts exist between past researchers and the data is limited in the high temperature and high chloride concentration range which is necessary with regards to setting boundary conditions for enhancement of tafel diagram model presented in this research. The objective of this paper is to investigate the detrimental coupled effects of chloride and temperature on corrosion of reinforced concrete structures in the high range by incorporating classical Tafel diagram chloride induced corrosion model and laboratory controlled experimental non-linear effect of temperature on corrosion of rebar embedded in concrete.
Flexural Test for a Monolithic Holed Web Prestressed Concrete (HWPC) Girder
Han, Man-Yop ; Jin, Kyung-Suk ; Choi, Sok-Hwan ;
International Journal of Concrete Structures and Materials, volume 4, issue 2, 2010, Pages 77~87
DOI : 10.4334/IJCSM.2010.4.2.77
Prestressed concrete (PSC) I-type girders have been used for span length around up to 40 m in domestic region. PSC girders are very cost effective girder type and extending their lengths more than 50 m will bring large benefit in cost. A new design method was proposed by combining two notable design concept in order to extend the applicable span length in this study. First of all, several numbers of openings was introduced in the girder web, and half of the anchorage devices were moved into the openings. In this way, large compressive stress developed at end zone was reduced, and the portion of design load coming from self-weight was reduced as well. Secondly, prestressing force was introduced in the girder not once at the initial stage, but through multiple loading stages. A full scale girder with the length of 50 m with the girder depth of 2 m was fabricated, and a flexural test was conducted in order to verify the performance of newly developed girder. Test results showed that the new holed web design concept can provide a way to design girders longer than 50 meters with the girder height of 2 m.
Critical Compressive Strain of Concrete under a Long-Term Deformation Effect Part I. Experiments
Nghia, Tran Tuan ; Chu, In-Yeop ; Kim, Jin-Keun ;
International Journal of Concrete Structures and Materials, volume 4, issue 2, 2010, Pages 89~96
DOI : 10.4334/IJCSM.2010.4.2.89
This paper focuses on the effect of creep on the critical compressive strain (CCS) of concrete. The strain of concrete corresponding to the peak compressive stress is crucial in the selection of the ultimate yield strength of the reinforcing bar used in reinforced concrete columns. Among the various influencing factors, such as the creep, shrinkage, loading rate and confinement, the effect of creep and shrinkage is the most significant. So far, investigations into how these factors can affect the CCS of concrete have been rare. Therefore, to investigate the effect of creep and shrinkage on CCS, an experimental (part I) and a parametric study (part II) were conducted, as presented in these papers (part I considers creep effect, part II considers effect of creep and shrinkage). In part I, experiments pertaining to the loading age, loading rate, loading duration and loading and creep levels were conducted to study the effect of these variables on the CCS of concrete. It was found that the effects of the loading rate, loading age, and level and duration on the CCS of concrete were negligible. However, it is very important to consider the effect of creep.
Rheological, Mechanical and Structural Performances of Crushed Limestone Sand Concrete
Akrout, Khaoula ; Mounanga, Pierre ; Ltifi, Mounir ; Jamaa, Nejib Ben ;
International Journal of Concrete Structures and Materials, volume 4, issue 2, 2010, Pages 97~104
DOI : 10.4334/IJCSM.2010.4.2.97
The crushed limestone sand is an abundant material in Tunisia, which induces many environmental problems. Indeed, available stocks of siliceous sand drastically decrease because of its massive use in hydraulic concrete. Some recent research works, carried out in Tunisia, concluded that crushed limestone sand may be used in concrete manufacture instead of siliceous sand traditionally used. In this context, an experimental study was achieved in order to quantify the influence of a partial or total substitution of siliceous sand by crushed limestone sand on hydraulic concrete performances. Preliminary chemical and physical tests on crushed sand indicated that it presented the minimum requirement for its use as aggregate in hydraulic concrete. 79 concretes were then prepared with siliceous sand, crushed limestone sand and a mix of the two sands. Their slump value and compressive strengths were measured on plain concretes. Complementary structural tests on reinforced concrete beam were also performed. The results proved that crushed limestone sand concretes showed workability and mechanical performances closed to those of siliceous sand concretes.
Chloride Diffusion in Mortars - Effect of the Use of Limestone Sand Part I: Migration Test
Akrout, Khaoula ; Ltifi, Mounir ; Ouezdou, Mongi Ben ;
International Journal of Concrete Structures and Materials, volume 4, issue 2, 2010, Pages 105~108
DOI : 10.4334/IJCSM.2010.4.2.105
In order to determine the effect of the use of limestone sand on chloride ion ingress in mortar, specimens were cast with two different sands: siliceous sand (used as reference) and limestone crushed sand (used for this study). To compare and assess the resistance of this mortar to chloride penetration, two different diffusions tests were employed: slow migration and rapid migration (AASHTO test). In this study, calculation of the effective diffusion coefficient is proposed using a model based on Nernst. Planck equation. The diffusion coefficients from each sample were compared. The results for all tests show that the diffusion coefficients for siliceous sand mortar are larger than those obtained with limestone sand. It appears also that the diffusion coefficient varies as a function of the W/C ratio.
Chloride Diffusion in Mortars - Effect of the Use of Limestone Sand Part II: Immersion Test
Akrout, Khaoula ; Ltifi, Mounir ; Ouezdou, Mongi Ben ;
International Journal of Concrete Structures and Materials, volume 4, issue 2, 2010, Pages 109~112
DOI : 10.4334/IJCSM.2010.4.2.109
Part I of this study was devoted to the electrical accelerated chloride diffusion in mortars. In this second part, natural chloride diffusion has been investigated for four types of mortars under exposure to a 0.5 mol/L NaCl solution for a period of up to 35 days. Two different types of sand were used for the production of test samples: siliceous sand (used as a reference) and limestone sand (used in this study). The effect of water to cement ratio and exposure time on the diffusion coefficients of mortars was also investigated. In this study, the total and free chloride content and penetration depth of mortar were measured after immersion, and Fick's second law of diffusion was fitted to the experimental data to determine the diffusion coefficient. Their results show that the use of crushed limestone sand in mortar had a positive effect on the chloride resistance. The apparent diffusion coefficient in all specimens was smaller than that in siliceous sand mortar. However, the chloride penetration of these mortars was increased as exposure time progressed.
Experimental Study of Steel Fiber Concrete Slabs Part I: Behavior under Uniformly Distributed Loads
Ellouze, Ali ; Ouezdou, Mongi Ben ; Karray, Mohammed Ali ;
International Journal of Concrete Structures and Materials, volume 4, issue 2, 2010, Pages 113~118
DOI : 10.4334/IJCSM.2010.4.2.113
This article aims to study the effects of adding steel fibers to concrete on the mechanical behavior of steel fiber concrete (SFC) slabs. After formulating the SFC, an experimental work was, first, conducted on
mm cylindrical specimens and
mm prisms. Then, this study was carried out on 20 rectangular
mm small slabs submitted to a distributed load. Two types of fibers with hooked ends were used: long fibers (LF) of a length of 50 mm and short fibers (SF) of a length of 35 mm. The studied parameters are compressive and tensile strengths and Young's modulus. Plain concrete (PC) small slabs were also prepared to be compared to the SFC specimens. The results showed that the compressive strength of SFC increased up to 25% while the splitting tests showed an improvement of the SFC reaching 45%. Tests on SFC small slabs also showed that a smaller deflection is obtained with respect to PC, which indicates an improvement in strength (up to 100%), in ductility and in resistance to cracking. The LF gives a better improvement in strength than the SF for a 70%
of steel proportioning.
Effect of Fineness Modulus of Reactive Aggregate on Alkali Silica Reaction
Jun, Ssang-Sun ; Jin, Chi-Sub ;
International Journal of Concrete Structures and Materials, volume 4, issue 2, 2010, Pages 119~125
DOI : 10.4334/IJCSM.2010.4.2.119
In this study, the effects of the fineness modulus of reactive aggregate on ASR expansion and ASR products have been investigated. The reactive aggregate used was metamorphic aggregate originated from Korea. ASR tests were conducted according to accelerated mortar bar test. The morphology and chemical composition of products formed in mortar bars, 5 years after the mortar bar test had been performed, were studied by scanning electron microscopy equipped with energy dispersive spectroscopy. Test results indicated that ASR expansion of mortar bars decrease in linear proportion to the fineness modulus of reactive aggregate. SEM images indicated that mortar bars showed reactive products formed in cement paste, within air voids and within cracks through particles except for the mortar bar with the fineness modulus of 3.25. The EDS analysis of the reactive products showed presence of silica, calcium and sodium, typical of ASR product composition.