CRACKS IN LATEX-MODIFIED CONCRETE OVERLAYS--HOW THEY GET THERE, HOW SERIOUS THEY ARE, AND WHAT TO DO ABOUT THEM
The cause, effect, and prevention of cracks in latex-modified concrete (LMC) overlays were investigated. The types of cracks that occur in concrete, whether the concrete is LMC or conventional, are divided into two categories: internally caused and externally caused. Internally caused cracks are plastic and shrinkage cracks. As in any quality concrete, LMC is subject to both of these if good construction practices are not followed. In addition, because LMC has a low water content, it has little bleed water available to evaporate and thus should be protected during placement if extreme drying conditions exist. Externally caused cracks include cracks caused by physical tearing, and flexural, reflective, and thermal cracks. All of these processes can be minimized or avoided by following proper construction practices. If cracking occurs in an LMC overlay, it is necessary first to determine the extent of the cracking before deciding on the remedy. Cracks that are shallow, 1/8 in. deep or less, do not affect the permeability performance of the overlay. Deeper cracks, however, should be sealed. Laboratory studies of crack-sealing techniques indicate that the low-viscosity sealers are capable of filling most cracks and are recommended when full-depth penetration is required.
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Availability:
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Supplemental Notes:
- This paper appears in Transportation Research Record No. 1301, Factors Affecting Properties and Performance of Pavements and Bridges 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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Authors:
- Kuhlmann, L
- Publication Date: 1991
Media Info
- Features: Figures; References; Tables;
- Pagination: p. 17-21
- Monograph Title: Factors affecting properties and performance of pavements and bridges, 1991
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Serial:
- Transportation Research Record
- Issue Number: 1301
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Bridge decks; Cracking; Fatigue (Mechanics); Flexural strength; Latex modified concrete; Overlays (Pavements); Parking garages; Reflection cracking; Sealing compounds; Shrinkage; Tearing; Thermal stresses
- Uncontrolled Terms: Crack sealing; Flexural fatigue
- Old TRIS Terms: Shrinkage cracks; Thermal fracture
- Subject Areas: Bridges and other structures; Design; Highways; Materials; Terminals and Facilities; I24: Design of Bridges and Retaining Walls; I32: Concrete;
Filing Info
- Accession Number: 00616317
- Record Type: Publication
- ISBN: 0309051053
- Files: TRIS, TRB, ATRI
- Created Date: Oct 31 1991 12:00AM