International Concrete Abstracts Portal

Due to increasing volumes of fly ash production each year, new utilization areas must be found. A new application had been developed at Bogazici University. Fly ash with various weight percentages of rubber tire chips were mixed and compacted at a water content wet side of optimum. Sealed single ring infiltrometer and falling head permeability tests were conducted on these specimens with water and gasoline as the permeants. Unconfined compression and split tensile strength tests were conducted to evaluate the mechanical behavior of the proposed liner material. When gasoline was permeated through rubber-fly ash specimens, a decrease was observed in the permeability as compared to that measured during water permeation. This decrease is due to the physical characteristic of rubber, expansion upon contact with gasoline. The expanded rubber holds some portion of the gasoline in itself, while sealing the voids and blocking the passageways for further leakage. For the above-mentioned technique, patent protection has been applied. This technique has a good application in the field because the liability for the underground petroleum storage tanks will decrease considerably when this technique is used.

Three reactive aggregates from New Brunswick, Canada, a greywacke, a gneiss, and a meta-volcanic rock were evaluated for their potential alkali reactivity (AAR) in concrete mixtures incorporating 420 kg/m 3 of cementitious materials. The concrete mixtures consisted of the control made with CSA Type 10 low- and high-alkali cements and mixtures incorporating ASTM Class F fly ash at 20, 30, and 56 percent replacement levels of the high-alkali cement. The susceptibility of the concretes to AAR was evaluated by casting test prisms and subjecting these to various accelerated curing conditions in the laboratory. For comparison purposes, mortar bars were also made and tested according to the ASTM C 1260-94 Accelerated Mortar Bar Test procedure. The AAR concrete prism tests performed in this study have shown that none of the test prisms cast from concrete mixtures incorporating 20, 30, and 56 percent fly ash showed significant expansion after two years of testing at 38 C and relative humidity >95 percent. These results were in good accordance with those obtained in the accelerated mortar bar test. Some alkaline immersion tests results would indicate, however, that concrete incorporating 20 percent fly ash might not offer adequate protection against potential deleterious expansions with highly reactive aggregates.

Presents the results of a joint project between CANMET, Ottawa, Canada, and NORCHEM Concrete Products, Inc., Hauppauge, New York, on the performance of concretes incorporating various forms of silica fume. Eleven different product forms of silica fume were used in four series of concrete with water-cementitious materials ratio of 0.40, 0.35, 0.30, and 0.22. Test specimens from the above concretes were subjected to varying curing conditions and were tested for compressive and flexural strengths, drying shrinkage, and rapid chloride permeability. It was found that, in general, the performance of the silica fume concretes in terms of mechanical properties was comparable, regardless of the silica fume product form used and the SiO 2 content of the fumes. The Rapid Chloride Permeability values, in coulombs at 41 days, a measure of the resistance of concrete to the penetration of chloride ions (AASHTO T277) for all the silica fume concretes tested except those made with silica fume blended cements, ranged from 94 to 346 coulombs, indicating very low permeability of the concretes. The values for concretes made with the blended silica fume cements were slightly higher.

Presents the results of a study to investigate the effectiveness of ground granulated blast furnace slag, fly ash, and silica fume in controlling chloride penetration into concrete of high water-binder (w/b) ratio. To simulate field conditions, the tests were carried out on 1000 x 500 x 150 mm reinforced concrete slabs. to understand the basic roles of mineral admixtures in controlling chloride penetration, the cement was replaced, mass for mass, by 65 percent slag, 30 percent fly ash, and 10 percent silica fume without either modifying the water-binder ratio or using a water-reducer or superplasticizer. A constant and high water-binder ratio was deliberately used for all the concrete mixtures; the results are compared, where appropriate, with mixtures of lower w/b. the effects on workability, compressive strength, and chloride penetration were then evaluated, the latter two properties over a period of 18 months through cyclic exposure to four percent sodium chloride solution. Irrespective of their effects on workability and compressive strength, all the cement replacement materials reduced both the depth of penetration and the chloride concentration at a given depth from the concrete surface. Silica fume was the most effective and fly ash the least. Even at a very high w/b of 0.75, slag concrete showed a consistently lower chloride concentration for all exposure levels up to 50 cycles, and at all depths from the concrete surface compared to that of portland cement concrete. Both the type of supplementary cementing material and the period of exposure influenced chloride penetration, but the water-binder ratio also had a significant effect at all ages.

Thin concrete overlays are widely used for protection against corrosion during the rehabilitation of concrete bridge decks. These overlays protect the reinforcing steel from the ingress of chlorides from deicing salts or the marine environment. The Virginia Department of Transportation (VDOT) has successfully used thin concrete overlays containing silica fume (minimum thickness 1-1/4 in. [32 mm]) to provide a high resistance to the penetration of chlorides into the concrete. Silica fume concrete (SFC) overlays are now an acceptable alternative to other rehabilitation procedures. In the development of SFC overlays, certain problems were encountered at different phases of production and construction, including proportioning, mixing, bonding, consolidation, and curing. These problems and their solutions are discussed in this paper, and recommendations are made for minimizing problems in future installations.