Latex-modified Concrete Overlay Containing Type K Cement

Latex-modified Concrete Overlay Containing Type K Cement
Author: Michael M. Sprinkel
Publisher:
Total Pages: 21
Release: 2005
Genre: Concrete bridges
ISBN:

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Hydraulic cement concrete overlays are usually placed on bridges to reduce the infiltration of water and chloride ions and to improve skid resistance, ride quality, and surface appearance. Constructed in accordance with prescription specifications, some overlays have performed well for more than 30 years whereas others have cracked and delaminated before the overlay was opened to traffic. Shrinkage of the concrete is the most common cause of cracking in overlays. The use of Type K (expansive) cement should increase the probability that concrete overlays with minimal cracks will be constructed. This report describes the Virginia Department of Transportation's first experience with the use of Type K cement for the construction of a latex-modified concrete overlay. One lane of the overlay was constructed with traditional Type I/II cement, and the other lane with Type K cement. With the exception of the cement, the requirements for the overlays were the same. The evaluation of the overlays included measurements for slump, temperature, air content, compressive strength, permeability to chloride ion, shrinkage, and bond strength. As expected, the shrinkage of the concrete containing Type K cement was much less than that of the concrete containing Type I/II cement. Other properties were similar. The use of Type K cement is estimated to increase the cost of the concrete approximately 2.6 percent, or about $1/yd2 for an overlay 1.5 in thick. This is much less than the cost to seal the shrinkage cracks in an overlay: $10/yd2. Greater savings can also come from the longer service life of a crack-free overlay. To gain more experience, the Virginia Department of Transportation should construct additional latex-modified concrete overlays using Type K cement.

Latex-modified Concretes and Mortars

Latex-modified Concretes and Mortars
Author: V. Ramakrishnan
Publisher: Transportation Research Board
Total Pages: 76
Release: 1992
Genre: Technology & Engineering
ISBN: 9780309053037

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This synthesis wil be of interest to materials engineers, construction engineers, maintenance engineers, pavement contractors and others interested in the use of latex-modified mortars (LMM) and concretes ( LMC). Information is provided on material properties of various LMM and LMC, as well as current construction practices used for LMM and LMC. Potential applications for LMM and LMC are also included. The use of innovative modified portland cement mortars and concretes for construction and maintenance applications is growing. This report of the Transportation Research Board describes the current state of the practice with respect to the use of latex-modified portland cement concretes and mortars. The extent of use of each material (including case histories), based on results of surveys of state highway agencies and a review of the literature, is summarized.

Polymer-modified Hydraulic-cement Mixtures

Polymer-modified Hydraulic-cement Mixtures
Author: Louis A. Kuhlmann
Publisher: ASTM International
Total Pages: 162
Release: 1993
Genre: Latex
ISBN: 0803114907

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A dozen papers from a June 1992 symposium in Louisville, Kentucky review the current use of organic polymers dispersed in water and formulated to add to portland cement. One sets out the status of ASTM's forthcoming specification and test methods. Others discuss such aspects as solid grade acrylic c

Overview of Latex Modified Concrete Overlays

Overview of Latex Modified Concrete Overlays
Author: Michael M. Sprinkel
Publisher:
Total Pages: 38
Release: 1984
Genre: Bridges
ISBN:

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Twelve bridges with latex modified concrete (LMC) overlays ranging in age from new to 13 years were studied and their general condition found to be good. The half-cell and chloride data were inconclusive because background data were not available for the older overlays, but the data should be useful some 5 to i0 years from now if similar data are collected at that time for comparison. The shear strength of the bond between the LMC overlays and the base concretes was about the same or greater than that of the base concrete, which indicates that good bonds were achieved and have been maintained. The permeability to chloride ions based on the rapid permeability test was an average of 773 coulombs (very low) for a 1.25 in. thick LMC overlay and 4,590 coulombs (high) for the base concretes. The inverse of the ratio of the logarithm of the permeability of the LMC overlay to that of the base concrete was 1.27, which provides a very conservative indication of the relative benefits to be obtained from the LMC overlay as compared to an A4 concrete overlay. The three sets of cost assumptions developed indicate that an LMC overlay costs 6% to 31% more than an A4 concrete overlay. Considering that the benefit-to-cost ratio ranged from 0.97 to 1.20, it was concluded that for bridges in which the low permeability provided by the LMC overlay is needed, the benefits usually obtained are worth the extra cost when compared to that of an A4 concrete overlay.

Styrene-butadiene Latex Modifiers for Bridge Deck Overlay Concrete

Styrene-butadiene Latex Modifiers for Bridge Deck Overlay Concrete
Author: Kenneth C. Clear
Publisher:
Total Pages: 134
Release: 1978
Genre: Bridges, Concrete
ISBN:

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Styrene-butadiene (S/B) latex modified concrete overlays are being used to protect new bridge decks from rapid deicer-borne chloride intrusion and also in bridge deck rehabilitation efforts. The purposes of this research were to evaluate several commercially-available S/B latex modifiers for bridge deck overlay concrete; and to develop chemical specifications for the material, a prequalification program to permit evaluation of other S/B latex modifiers which become available, and a certification program to insure the user receives a prequalified product. The chemical and physical properties of the latex emulsions were studied (percent solids, percent butadiene, particle size, surface tension, viscosity, etc.) and the material from each manufacturer was finger printed using infrared spectroscopy. The physical properties of concrete made with each material were also determined (workability, strength-compressive, flexural and bond, freeze-thaw and scaling resistance, and chloride permeability).