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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 48 Abstracts search results
Document:
SP200-41
Date:
June 1, 2001
Author(s):
S. Tanwongsval, M. Maalej and P. Paramasivam
Publication:
Symposium Papers
Volume:
200
Abstract:
In recent years, increasing efforts have been geared toward enhancing the axial load-carrying capacity of wall-like (i.e. high aspect ratio) RC columns commonly used in building estates in Singapore. Although it has been proven through experimental results that composite fiber wraps are effective in strengthening round and square columns by providing passive confinement pressure to the core concrete, wall-like columns experience less effect from confinement, which is limited to the comers. In addition, published research work on wall-like column strengthening did not consider the effects of sustained loading during the application of the FRP. Consequently, the present study explores an alternative strengthening scheme that employs other materials in addition to composite sheets and will investigate the effects of sustained loading on the strengthening efficiency.
DOI:
10.14359/10608
SP200-42
S. K. Mandal and M. A. Mansur
Unlike circular columns, jacketing of oblong or wall-type columns produces only marginal improvement in strength and ductility because of inadequate confinement and premature debonding of the wrap. Some possible ways to overcome this problem, at least partially, are to round the corners, to add a semi-circular segment at each of its shorter sides or to produce an elliptical shape enclosing the oblong column. A total of 13 specimens of these cross sectional shapes were tested in direct compression to assess the enhancement afforded by external fiber wraps. It has been found that the modification of a rectangular section by including a semi-circular segment on each of its shorter side or transforming the section to an ellipse before applying fiber wrap leads to a substantial improvement in strength as well as ductility. Of the two fibers used, the glass fiber composite proved to be more cost effective in terms of strength and ductility enhancement.
10.14359/10609
SP200-43
S. Swaddiwudhipong and D. Jiang
The paper presents an experimental study on the performance of steel-reinforced concrete (SRC) joints under reversal cyclic loads. Five composite joint specimens comprising built-up steel-reinforced concrete column connecting to reinforced concrete (RC) beams were tested to failure. Three modes of failure were observed. They are (1) bending failure in beam. (2) bending-shear failure in beam and (3) shear failure in beam and joint. Test results indicated that energy absorption capacity of the SRC joint depends on the modes of failure as well as the levels of axial load imposed on the column. The latter also influence the shear capacity of the joint.
10.14359/10610
SP200-44
P. Stroeven, Z. Shui, C. Qian, and Y. Cheng
This paper deals with trial testing on concrete reinforced by different combinations of carbon-steel, polypropylene-steel or steel-steel hybrid fibres in the low volume content range to ensure high electrical resistivity of the fibre concrete. Optimum reinforcement composition is obtained for (compression, splitting tension, and flexural) strength testing conditions and for post-peak behaviour. The effect of various measures adopted to promote uniform fibre distribution are assessed by impedance measurements. During the testing program, fibre distribution is checked by microscopy and SEM.
10.14359/10611
SP200-45
J. M. Khatib and D. J. Ellis
The properties of concrete containing foundry sand as a partial replacement of fine aggregate were investigated. Three types of sand used in foundries were considered, the white fine sand without the addition of clay and coal, the foundry sand before casting (blended), and the foundry sand after casting (spent). The standard sand (Class M) was partially replaced by (O%, 25%, 50%, 75% and 100%) these types of sand. Thirteen concrete mixtures were employed to conduct this study. Concrete strength up to 90 days and length change (drying shrinkage and expansion) up to 60 days were determined. As the replacement level of standard sand with sand used in foundries increased, the strength of concrete decreased. Concrete containing white sand showed somewhat similar strength to those containing spent sand at all replacement levels. The presence of high percentage of blended sand in the concrete mixture caused a reduction in strength as compared with concrete incorporating white sand or spent sand. The increase in strength was not observed at low replacement levels (less than 50%). The length change of concrete increased -as the replacement level of standard sand with the three types of sand increased. Drying shrinkage values were higher in concrete containing spent sand and lower in concrete containing white sand. Expansion was generally lower in concrete containing white sand as compared with the other two types (blended and spent) at a low sand replacement level of 25%; and, different trend was obtained at higher levels.
10.14359/10612
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