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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 10 Abstracts search results
Document:
SP278
Date:
March 1, 2011
Author(s):
Editor: Mahmoud Reda Taha / Sponsored by Committee 548
Publication:
Symposium Papers
Volume:
278
Abstract:
This CD-ROM contains nine papers sponsored by ACI Committee 548. The extended use of polymers in concrete has grown significantly in the last two decades. This is demonstrated from the common use of epoxy to repair cracks, to the use of polymer concrete overlays to protect bridge decks. The papers provide insight into the current state of research and development for the use of polymers in concrete and new trends that will shape the frontiers of the polymer concrete industry in the near future. Note: The individual papers are also available. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP-278
DOI:
10.14359/51682357
SP278-07
D.W. Fowler and D.P. Whitney
Thin polymer concrete overlays (TPCOs) consist of a polymer binder and aggregates with a thickness of 1 inch (25 mm) or less. They have been widely used for providing long-lasting wearing surfaces for bridge decks. Their advantages include adding little dead load; very fast cure; shallow depths that eliminate raising approach slabs and permitting the transition from overlaid lane to non-overlaid lane during construction; excellent bond to concrete; very low permeability; and excellent skid resistance. Over 2200 have been installed in the U.S. and Canada, and they have become a recognized method for extending the lives of bridges. The state of practice has become well established. Evaluation of the substrate, repair of the substrate, and surface preparation are essential to having a sound surface for applying the TPCOs. The three types of overlays normally used are multiple layer, slurry and premixed. Epoxies are the most widely used resins although methacrylates and polyester styrenes are used for some applications. Resin application rates and aggregate gradings and application rates are also quite important.
10.14359/51682506
SP278-08
E.M. Soliman, U.F. Kandil and M.M. Reda Taha
This research examines the significance of using carbon nanotubes (CNTs) on the mechanical characteristics and microstructural features of latex modified mortar (LMM). CNTs have been introduced recently as a new nanoscale material with excellent mechanical properties. This work examines the ability of various CNTs’ contents to alter the mechanical properties of latex modified mortars. Compression and tension tests were performed on LMM specimens with and without CNTs at 7 and 28 days of age. The experimental investigations showed that CNTs can enhance the strength and deformation characteristics of LMM. Microstructural investigations showed CNTs to be well dispersed and bonded to the polymer latex matrix. It is concluded that CNTs can be a useful alternative to enhance the mechanical characteristics of polymer modified cement composites.
10.14359/51682507
SP278-09
M.M. Sprinkel
Hydraulic cement concrete overlays made with latex-modified concrete (LMC) and silica fume concrete (SFC) are typically used to extend the life of bridge decks because the overlays reduce the infiltration of water and chloride ions. Rapid concrete overlays can be used to reduce lane closure time and associated traffic congestion and road user costs. LMC prepared with very early hardening cement (LMC-VE) has been used as a rapid overlay for bridge decks in Virginia since 1997. This paper compares the performance of LMC-VE overlays to that of conventional LMC and SFC overlays. Results indicate that LMC-VE overlays are performing as well or better than LMC and SFC overlays. LMC-VE has become a standard overlay for situations in which lane closures cause major traffic congestion. The higher cost of materials for LMC-VE overlays can be off set by lower costs for traffic control. Including user cost savings make LMC-VE overlays even more cost effective.
10.14359/51682508
SP278-05
M.A. Alhassan and S.M. Ashur
It is generally accepted that the latex-modified concrete (LMC) overlay is a superior protection system for bridge decks. The incorporated latex acts as a plasticizing agent providing good workability even for low water/cement ratios. When exposed to air, the latex polymerizes forming a membrane around the hydration products resulting in a lower permeability and inherent flexibility to resist freeze and thaw cycles. Nevertheless, the latex imposes constructability limitations that dramatically increase the initial installation cost of the LMC overlay. The latex starts to polymerize within 15-30 minutes dictating the need for mobile mixers to install the LMC overlay. The cost of the latex adds to the cost of the LMC especially when the oil price increases. This paper presents and discusses the effect of different types and combinations of macro and micro synthetic fibers on the major performance characteristics and constructability of the fibrous LMC overlay.
10.14359/51682504
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