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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 8 Abstracts search results
June 1, 1993
Addition of epoxy components to portland cement concrete before or during mixing is a special form of polymer modification of concrete. The polymerization of the epoxy components takes place subsequently in the concrete along with the cement hydration, resulting in a strong, durable polymer inside the hardened concrete. Therefore the process may be called post-mix polymerization. The purpose of the modification is to improve certain properties of a mortar or concrete in the fresh as well as hardened state, such as workability, flexural and compressive strengths, impermeability, etc. In this paper first the properties of the epoxy components and epoxy are discussed that are pertinent to the polymerization and concrete modification. Then the polymerization process is described along with the principles of epoxy modification of concrete. A brief description of mix design for epoxy modified concrete closes the paper.`
J. J. Fontana
Steel fiber reinforced polymer concretes were developed for utilization in large precast vaults. The data obtained indicate that polyester resin concrete reinforced with steel fibers will provide a ductile composite allowing structural engineers to design vaults capable of withstanding HS-20 loadings. Epoxy resin concretes exhibit higher flexural strengths; however, they do not carry loads beyond the yield point of the composite and are considered too brittle for this application. Several vaults were cast and have been placed in service.
M. Kawakami, H. Tokuda, M. Kagaya, and R. Nasu
Reinforced concrete pipe used as sewer pipe is required to have excellent durability, especially chemical resistance, in addition to high strength and good economy. A precast composite pipe, in which a reinforced concrete pipe is lined with polymer mortar as soon as centrifugal compaction and drainage have been completed, was developed and investigated. Chemical resistance of the polymer mortar exposed to acidic and alkaline water was studied first by immersion tests and manufacturing process of the composite pipe was introduced next. Subsequently, load tests were carried out and elastic behavior, cracking, and breakable strength of the pipes were investigated. Finally, a reasonable design method for the composite pipe is discussed and proposed.
J. M. Daly
Matching certain properties of polymer concrete overlays and repair materials more closely with those of concrete can produce better compatibility between the resin-based material and the cementitious substrate. The key parameters of polymer concretes that are significant to this end include the resin type and loading, shrinkage properties, coefficient of thermal expansion, and modulus of elasticity. The approach used most often has been to minimize the resin loading requirements. This approach, by itself, imposes certain limitations on the type of products that can be formulated. In the course of work to develop shrinkage-controlled polymer concrete utilizing an unsaturated polyester binder, it was discovered that the shrinkage control agent contributes in an important way to the thermal and elastic properties of the material. This paper describes how this finding was used to develop polymer concrete that is more compatible with portland cement concrete.
Editor: D. Gerry Walters
An ACI publication providing information on an assortment of polymer concrete-related topics. Polymers are gaining increasing use in concrete due to the fantastic properties that they can provide. Polymer concrete is used for repairs, bridge deck and floor overlays, precast products, and structural members. Other uses are continuously under development.
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