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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 1-10 of 18 Abstracts search results
June 17, 2003
J. Liu and C. Vipulanandan
Deteriorating sewer facilities require rapid in-situ rehabilitation and using coating as a corrosion protection is one method currently being adopted. Hence, applicability and performance of coatings under dry and wet conditions must be investigated. Performance of a polymer concrete coating was evaluated using a combination of full scale and laboratory tests. The polyester based polymer concrete coating had a density of 1.75 g/cm3 (109 lb/ft3) and a hardness in the range of 38 to 45 (Barcol hardness). Full-scale test on coating applicability and performance on concrete substrate was performed under a hydrostatic pressure of over 103 kPa (15 psi) of water, simulating the groundwater condition. Coated concrete cylinders and clay bricks with holidays (pinholes) were used to study the chemical resistance under acidic environments to represent the worst sewer and accelerated test conditions (ASTM G 20). Bonding strength between the coating and the concrete and clay brick substrates were determined using the modified ASTM D 4541 and ASTM C 321 tests. Performance of the polymer concrete coating material was studied for over 3 years and the results are analyzed to determine the performance of the polymer concrete coating.
G. J. Fallis
In recent years, sulphur concrete has proven to be capable of withstanding attack by some of the most aggressive chemicals used in industry. This fast setting, acid and salt resistant concrete is well suited for use in the mineral processing and fertilizer production industries. This paper briefly describes the properties, production, application and performance of this new construction material, with references to actual commercial installations and reviews the long term durability of these projects in harsh chemical environments.
M. M. Reda Taha
Strengthening and rehabilitation of reinforced concrete structures using externally bonded Fibre Reinforced Polymers (FRP) strips has become a well-established technique with a large research database. Epoxy-modified mortar (EMM) has been used in the industry for more than three decades for various strengthening and rehabilitation purposes. Epoxy modified mortar without a hardener has recently been investigated. The new EMM without a hardener includes polymerlcement ratios as low as 20 percent compared to the 40-60 percent that is usually required to provide suitable mechanical properties of conventional EMM. The new EMM utilizes the cement hydrates to polymerize the epoxy resin in the cement matrix in the absence of a hardener through ring-opening polymerization. The use of ring-opening polymerization provides EMM (without a hardener) with an interesting ability to grow through any developed crack and to repair itself, thus showing enhanced fracture toughness with age. The new self-repair epoxy mortar (SREM) has shown better mechanical performance than the conventional EMM with the same polymer/cement ratio. The objective of this work is to discuss the potential use of SREM to bond FRP laminates to existing concrete substrates in rehabilitation and strengthening applications. A multi-phase research programme examining the different strength, fracture and durability criteria of the SREM-FRP composite is proposed here. Fracture mechanics principles in conjunction with microstmctural investigations will explain and maximize the material ability to self-repair.
A. O. Kaeding and R. Prusinski
The use of polymer concrete (PC) curtain wall panels was started in the U.S. and other countries in the late 1950’s. Panel finish was typically an exposed aggregate with stone size and color selected to meet architectural requirements. Uninsulated panels were 5/8 to 1-in. thick and insulated sandwich panels were 2 to 4-in. thick. Unsaturated polyester with styrene monomer was used as the PC binder. The original developer and manufacturer of curtain wall panels performed extensive testing on the products and the PC used in production. Compressive strength, flexural strength, modulus of elasticity, tensile strength, freeze-thaw resistance, thermal transmittance, and resistance to weathering, coefficient of thermal expansion and flammability were all investigated. Full-scale load testing confirmed the strength and wind load resistance of the panels. Attachment and erection details were developed and tested. Panels with these properties have been performing successfully for the past 40 years. Unpublished results of this testing, the associated details and recommended specifications are presented in this paper. Properties determined in the tests reported are pertinent to other structural applications as well and expand the knowledge base for polymer concrete structures.
G. W. DePuy and F. E. Dimmick, Sr.
Polymer concrete (PC) overlays are often an effective way to repair or protect concrete surfaces exposed to hostile service conditions. The various applications of PC overlays include industrial floors exposed to abrasion and chemical spillage, concrete spillways and water conveyance structures exposed to abrasion erosion and freeze-thaw attack, and bridge decks exposed to severe weather conditions, deicing salts, and heavy traffic. Three general types of PC overlays are used premixed PC, multiple-layers PC, and slurry PC. Polymer binders include methacrylate monomer systems, and epoxy, polyester, and vinyl ester resins systems. Applications of PC overlays and progress in the development of standards are discussed.
D. A. Schmidt
Acrylic polymers are widely recognized for their excellent UV durability and water resistance properties. When acrylic polymers are used as modifiers in Portland cement formulations, those polymer properties translate into excellent long-term outdoor durability and wet adhesion durability in the modified concrete. A number of lab prepared series of acrylic polymer modified portland cement formulations have been placed in outdoor exposure and tested periodically for the durability of various properties. Some of these experimental series have been on exposure for as long as 30 years. The results of these studies indicate that acrylic polymers are the ideal cement modifiers with respect to outdoor durability and wet adhesion durability.
A novel and innovative use of polymer concrete to precast a dome is described. The finished dome meets architectural criteria for the project and is lightweight and durable, making field installation easier and faster. The project demonstrates the versatility of architectural precast polymer concrete.
D. W. Fowler
Concrete-polymer materials that include polymer-impregnated concrete (PIC), polymer concrete (PC) and polymer-modified concrete (PMC), have been developed within the past 50 years. PIC, which started out with great promise, has essentially disappeared from the scene. PC has been widely used for repairs, floor and bridge overlays, and precast components, but has not achieved the volume of use that had been projected. PMC has been widely used for overlays and repairs, including spray-on applications. There are many potential applications for the future related to materials processing and applications, which will ensure these materials will continue to be important in the construction field.
R. C. Prusinski and C. Bodea
The earliest use of polymers in concrete may date back to ancient Egypt. Modern day use of polymer concrete for architectural precast products began in 1957 with precast polymer concrete curtain wall panels. Applications may be found nearly worldwide.
A. O. Kaeding
A cast in place reinforced concrete building built in 1913 was repaired in 1975 using polymer impregnation, epoxy crack injection and epoxy grouting. The project is an example of using polymer impregnation to restore severely deteriorated, under-strength concrete. Original plans were to extend the useful life of the building by 15 years. This paper briefly reports that the building has been in service for 28 years since the restoration and is being replaced this year because it is no longer large enough. The building remains serviceable and there has been discussions of historic preservation after the new facility is completed.
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