Chloride ion penetration in bridge deck concrete — Texas

Seven concrete mixtures typically used in Texas bridge decks were evaluated for chloride permeability using the ponding test. The primary experimental variables were the curing duration, type and percentage of supplemental cementitious materials, type of coarse aggregate, duration of ponding, and the surface preparation of ponded concrete specimens. The results of this investigation indicated

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PDF Crack and Concrete Bridge Deck Sealant Performance

Crack and Concrete Bridge Deck Sealant Performance What Was the Need? Sound bridge maintenance practices prolong the useful life of a bridge and increase the time between major refurbishments such as redecking. A major source of deterioration of prestressed concrete bridges is corrosion of the steel reinforcement caused by the infiltration of corrosive substances, typically chloride ions

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Bridge Deck Overlays using Ultra-High Performance Concrete

Nov 14,  · This study investigated the use of a locally produced ultra-high performance concrete (UHPC) as an alternative to typical overlay materials. Several bond strength tests including slant-shear, splitting tension, and direct tension tests were performed to assess the bond strength between UHPC and normal strength concrete (NSC) substrate with varying surface textures.

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Eurocode 2: Design of concrete structures EN1992-1-1

22 February 14 Concrete stress - strain relations (3.1.5 and 3.1.7) f cd ε c2 σ c 0 ε cu2 ε c f ck For section analysis “Parabola-rectangle” c3 ε 0 cu3 f cd ε σ c ε c f ck “Bi-linear” f cm 0,4 f cm ε c1 σ c ε

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PDF Evaluation of Keyway Grout Test Methods for Precast

Typical precast concrete box beam bridge deck section with asphaltic or concrete wear course after significant traffic exposure. prestressed concrete box beam con­ struction. Sometimes, the grout in the keyway allows leakage that is discov­ ered during inspection of the under­ side of the precast concrete elements. This is indicated by a white efflores­ cence adjacent to the grouted keyway

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CTLGroup Project No. 057122

Russell et al. 2006) is that the primary durability test run was chloride permeability. Further, the specified strengths for the bridge deck concrete ranged from 4000 to 6000 psi, except for bridges constructed in Georgia, Nebraska, and one in Texas. Although this is lower than the

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STRUCTURE magazine | Improved Bridge Deck Performance with

Typical results of the in-place concrete temperature and the measured restraint stress development for bridge decks placed under fall conditions are shown in Figure 2.The results from the rigid-cracking frame provide a relative index of cracking sensitivity, with a mixture with increased cracking time being an indication of improved cracking performance in the field.

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Performance-Related Specifications for Concrete Bridge

to the performance of flexible and rigid pavement structures. In the early and mid-1980s, the FHWA, the reinforced bridge deck or slab. The research effort described in Volume 2 of this report was divided in two the evaluation of the resistance of concrete to chloride permeability were used: rapid chloride permeability test, chloride

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Chicago Building Bridge to the Future - Cement

28-day compressive strength of the concrete to avoid creating an overly rigid structure. "Excessively high Chicago Building Bridge to the Future After the high-performance concrete deck is placed, a 57-mm (2.25-in.) thick, Chloride permeability (28 days) <2,000 coulombs AASHTO T 277 (ASTM C 1202)

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Items where Subject is "Structural Engineering" - KFUPM

Aug 06,  · Loss of punching capacity of bridge deck slabs from crack damage. Correlations between depth of water penetration, chloride permeability, and coefficient of chloride diffusion in plain, silica fume, and fly ash cement concretes. (1989) Use of latex modified concrete as a bridge deck overlay. Masters thesis, KFUPM.

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Electrokinetic nanoparticle treatment for corrosion

Aug 30,  · ASTM G109 specimens were used in this work as these simulate the configuration of the bridge deck and subjected to elevated chloride levels. Nanoparticles which were 24 nm in size were driven directly through the concrete matrix and to the reinforcement using an electric field. The intent was to use the nanoparticles as pore blocking agents that could prevent chlorides from re-entering and

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Investigation on Moisture Damage Prevention of a Spherical

on the bridge deck pavement as tack coat [20]. Rhee et al. delineated the relationship between the deterioration status of the concrete bridge deck and the asphalt concrete overlay, waterproof layer, cover thickness of rebar, corrosion of rebar, and chloride contents in the concrete. The results

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Internally-cured concrete being cast in a bridge deck

Internally-cured concrete being cast in a bridge deck, Monroe County, Indiana. 508: The photograph shows internally cured concrete being cast in a bridge deck months, the internally cured concrete was 20% stronger than the conventional concrete. Rapid chloride permeability testing (ASTM C1202) showed that the internally cured

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Low Permeability of Concrete for Bridge Deck Overlay

Low Permeability of Concrete for Bridge Deck Overlay. The penetration of chloride ions from deicing salts into the portland cement concrete of bridge decks can cause corrosion and serious damage to the reinforcing steel. Concrete properties which prevent chloride penetration into the bridge deck and provide a good structural and economic wearing surface are desirable. A variety of mix designs

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Sealants, Treatments and Deicing Salt Practices to Limit

0.03 percent chloride to weight of concrete = initiation of corrosion - 0.08 percent chloride to weight of concrete = accelerated corrosion - 0.18 percent chloride to weight of concrete = major section loss of steel (1) Two undesirable conditions emerge when reinforcing steel corrodes. First, the corrosion

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Rapid Chloride Permeability Tester - Sun LabTek

Corrosion of reinforcing steel due to chloride ingress is one of the most common environmental attacks that lead to the deterioration of concrete structures. Concrete contains flying ash or silica fumes are less permeability are less permeable to deleterious elements and thus are more durable than conventional concretes.

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PDF Final Report - TrueTech Bridge

Bridges, Concrete, Bridge deck, Stay-in-place metal forms, SIPMF, Permanent metal deck forms, Ground penetrating radar, GPR 544 An experimental study was conducted to determine if the use of stay-in-place metal forms (SIPMF) resulted in reduced bridge deck concrete quality over the life of the bridge compared to bridge decks formed conventionally without SIPMF. A corollary problem addressed

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PDF Structural Concrete Deck Protection Systems

Chloride-ion induced corrosion of reinforcing steel is the most destructive cause of the early deterioration of concrete bridge components, requiring costly maintenance and rehabilitation. A significant portion of this cost is related to the deterioration of reinforced concrete decks which are subjected to heavy loadings, harsh weather conditions, and regular winter use of anti-icing and

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PDF Development, Characterization and Applications of a Non

were proposed and a UHPC joint consisting of two pre-cast bridge deck elements was developed and tested at full scale. It was shown that a 6 " (150 mm) joint made of the developed UHPC was sufficient to successfully transfer loading between the decks. 17. Key Words Ultra-high performance concrete, non-proprietary, durability, strength, bond, joints, precast concrete, bridge, freeze-thaw 18

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PDF) Deterioration and restoration of concrete jetties

In a concrete jetty, the chloride ions migrate through the concrete to reach the reinforcing steel level. The rate at which this occurs is dependent on several factors, including the concrete cover and permeability, drainage, wetting and drying cycles, temperature, degree of cracking, and effectiveness of other protective methods.

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Concrete Terminology » T | Giatec Scientific Inc

Aug 23,  · T & G—see tongue and groove.. table, flow—a flat, circular jigging device used in making flow tests for consistency of cement paste, mortar, or concrete.(See also flow, [2]).. tacky—the sticky condition of an adhesive prior to hardening.. talc—a mineral with a greasy or soapy feel, very soft, having the composition Mg 3 Si 4 O 10 (OH) 2. (See also cement, masonry and Mohs scale.)

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Restoration of concrete decks - WHITMORE DAVID W

providing the electrically conductive anode so as to consist solely of a rigid sheet of a consumable steel material having an upper surface and a substantially planar lower surface which is placed onto the upper surface of the concrete deck with the electrolyte therebetween such that the ions are withdrawn from the concrete into the electrolyte;

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Ndt in Civil Engineering :The Case of Concrete Bridge Decks

In North America, the most serious form of deterioration in concrete bridge decks is the corrosion of steel rebars caused by the excessive use of chloride deicing salts during winter for the maintenance of the structures. As the reinforcement steel corrodes, it expands and creates a cracks or surface fracture plane in the concrete at, or just above, the level of the reinforcement (Fig. 2). The

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PDF OneTouch 4.0 Scanned Documents

AÄSHIO T277 Rapid Chloride Permeability test show a 10 times impermeability and 25 times resistivity improvement with the use of 1 2 percent silica fume. The Time—to Corrosion FYWA/NCHR.P 244 Slab Test is a scaled Cbwn steel rein— forced deck, from which macrocell corrosion current, AC resis— tance, half cell potential and chloride absorption is measured. Zero corrosion current vas

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CHAPTER FOUR - BRIDGE DECK PROTECTIVE SYSTEMS | Concrete

Silica Fume Concrete Overlays Three silica fume concrete overlays were placed on bridge decks in Virginia between 1987 and 1991 to evaluate the properties of silica fume concrete overlays and to deter- mine the minimum amount of silica fume needed to reduce the permeability of the decks to chloride ion penetration (Ozyildirim 1992). The study concluded that the addition of 7% silica fume with

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Krystol T1 & T2 Waterproofing System

equivalent to 51 m (167 ft.) of head pressure. Water permeability of concrete treated with Krystol T1 & T2 was reduced 75% compared to the equivalent plain concrete. Metro Testing Laboratories Ltd., CHLORIDE PERMEABILITY A 10% calcium chloride solution was allowed to pond on the surface of the Krystol T1 & T2 treated samples for 90 days. After

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