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International Concrete Abstracts Portal

Showing 1-5 of 56 Abstracts search results

Document: 

SP138-45

Date: 

September 1, 1993

Author(s):

K. Nakano, Y. Matsuzaki, H. Fukuyama, and M. Teshigawara

Publication:

Symposium Papers

Volume:

138

Abstract:

An experimental investigation was carried out to study and evaluate the flexural performance of concrete beams reinforced with continuous fiber bars (main reinforcing bars and prestressing tendons). Two series of flexural tests were conducted, and the primary variables were fiber material, tensile reinforcement ratio, concrete compressive strength, and bond condition in prestressing tendon. Through this experimental study, the following facts were clarified. The flexural performance of concrete beams reinforced with continuous fiber bars can be evaluated by conventional methods used in concrete beams reinforced with steel bars. The ductility capacity of reinforced concrete beams can be controlled by the compressive failure of concrete, and in prestressed concrete beams, can be controlled by changing unbonded length of prestressing tendon.

DOI:

10.14359/3955


Document: 

SP138-17

Date: 

September 1, 1993

Author(s):

Takashi Yamada, Kanji Yamada, and Kenji Kubomura

Publication:

Symposium Papers

Volume:

138

Abstract:

The potential of using pitch-based high-modulus carbon fiber was investigated as a reinforcement in cementitious composites for structurally reinforced concrete members. For this purpose, effects of carbon fiber mechanical properties on the mechanical properties of carbon fiber reinforced cementitious composites were studied through the three-point flexural test by using several pitch-based high-modulus carbon fiber rods of varying fiber moduli and strengths. For the specimens with a fiber volume fraction larger than the critical volume fraction, the flexural strength is found to exceed the mortar mix strength and is linearly proportional to the sum of all rod strengths, and the flexural modulus after matrix cracking is found to also be linearly proportional to the sum of all rod stiffnesses. 111-493

DOI:

10.14359/3860


Document: 

SP138-55

Date: 

September 1, 1993

Author(s):

H. Ichimasu

Publication:

Symposium Papers

Volume:

138

Abstract:

Part 1 of this study concluded that reinforcing bar stress intensity can be reduced, thereby confirming the possibility of strengthening. In Part 2, CFRP is bonded by various methods on the lower faces of reinforced concrete slabs. To determine bonding methods in detail, CFRP is studied with respect to the confirmation test and strengthening design methods. Strengthening design and measurement plans are then made for reinforced concrete slabs on an existing bridge. In strengthening design, the main reinforcing bars are strengthened with three to five layers. It is confirmed that the reinforcing bar tensile stress intensity is reduced around 120 to 130 MPa. CFRP may be used as a strengthening material for reinforced concrete slabs. Measurements will be conducted in 1993. Bending resistance will be confirmed directly during existing bridge strengthening operations.

DOI:

10.14359/4150


Document: 

SP138-34

Date: 

September 1, 1993

Author(s):

L.C. Bank and Z. Xi

Publication:

Symposium Papers

Volume:

138

Abstract:

An investigation of the behavior of concrete slabs reinforced with pultruded FRP (fiber-reinforced plastic) gratings is described. Data from tests on small-scale and full-scale slab specimens obtained from three different experimental programs, beginning in September of 1989, are reviewed. Particular attention is paid to the description of failure modes, crack patterns, flexural stiffness, and shear response of the slabs. Analytical methods, based on those developed for steel reinforced concrete slabs, used to obtain predictions of the ultimate strengths and the flexural stiffnesses of the slabs, are described. Comparisons between experimental data and theoretical predictions are presented.

DOI:

10.14359/10038


Document: 

SP138-10

Date: 

September 1, 1993

Author(s):

Janusz Kasperkjewicz and Hans W. Reinhardt

Publication:

Symposium Papers

Volume:

138

Abstract:

Several researchers have used aramid fibers as prestressing tendons and as chopped fibers in concrete because of their high strength and chemical resistance. In this investigation, an aramid fabric is used as bending reinforcement in concrete beams. Cracking, bending capacity, and ductility are determined experimentally. It is shown how effective aramid fabric can be if applied in several layers as tensile reinforcement.

DOI:

10.14359/3924


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