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International Concrete Abstracts Portal

Showing 1-3 of 3 Abstracts search results

Document: 

15-450

Date: 

May 1, 2017

Author(s):

H. Celik Ozyildirim, Evelina Khakimova, Harikrishnan Nair, and Gail M. Moruza

Publication:

Materials Journal

Volume:

114

Issue:

3

Abstract:

Cracks in concrete, high permeability, or leaking bridge joints facilitate the penetration of chloride solutions, resulting in extensive corrosion damage. Joints can be eliminated by constructing continuous decks or closure pours, and infiltration through concrete can be minimized by using low-permeability concrete and fiberreinforced concrete (FRC) that controls cracks. This study investigated low-permeability FRCs with polyvinyl alcohol (PVA), polypropylene (PP), or steel (S) fibers to control cracking in closure pours. Large volumes of suitable fibers used in FRC enable high residual strengths and deflection hardening behavior. Generally, in these concretes, multiple tight cracks (less than 0.004 in. [0.1 mm] wide) occur, which resist the ingress of harmful solutions. In two bridges on I-64 near Covington, VA, closure pours with FRCs were placed. The initial results indicate, in general, no or tight cracking in FRCs with PVA, PP, or S fibers. Deflection hardening did not occur in all mixtures; however, the tight cracks observed were attributed to the addition of fibers and the presence of primary reinforcement.

DOI:

10.14359/51689561

Document: 

91-M52

Date: 

September 1, 1994

Author(s):

ACI Committee 325

Publication:

Materials Journal

Volume:

91

Issue:

5

Abstract:

This report covers the present state of the art for roller compacted concrete pavements. It contains information on applications, material properties, mix proportioning, *design, construction, and quality control procedures. Roller compacted concrete use for pavements is relatively recent and the technology is still evolving. The pavement consists of a relatively stiff mixture of aggregate, cementitious materials, and water; that is compacted by rollers and hardened into concrete.

DOI:

10.14359/9760

Document: 

91-M13

Date: 

March 1, 1994

Author(s):

G.F. Kheder, R. S. Al Rawi, and J. K. Al Dhahi

Publication:

Materials Journal

Volume:

91

Issue:

2

Abstract:

The present work studies the problem of cracking due to volume change of base-restrained reinforced concrete walls. The cracking behavior of some 61 full-size walls and 14 experimental walls was investigated. The observed primary and secondary crack spacings and widths were compared with the values obtained using recently developed formulas and previous formulas developed by other researchers. A good agreement was found between the observed values and those predicted using the developed formulas. On the practical side, the results clearly showed that crack spacing and, consequently, the crack width, increased with the increase of the wall height and, therefore, a higher percentage of reinforcement or closer joints is required for their control. Furthermore, crack width was not uniform with the wall height, but varied according to the change of restraint associated with cracking and, therefore, the percentage of reinforcement may be varied with the wall height to obtain approximately uniform crack widths. This may lead to savings in reinforcement cost.

DOI:

10.14359/4566

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