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Bookmark or Share- Spall Repair of Horizontal Concrete SurfacesFollow the steps outlined below: Surface preparation. Step 1—Sound the concrete surfaces to locate delaminated areas. This may be done as described in ASTM D4580-03(2007), “Standard Practice for Measuring Delamination in Concrete Bridge Decks by Sounding.”. Step 2—Mark the perimeter of the repair area.
- Specification Guidelines for Surface Preparation of Concrete Prior to ...noise, dust, and flying debris. Also, breakers should be operated at less than 45 degrees from the vertical. Removal near the repair boundaries must be completed with spade bits, as gouge bits can damage sound concrete. High-pressure water jets: This type of system (Fig. 2) employs a small jet of water driven at high velocities,
- Guide for Conducting a Visual Inspection of Concrete in ServiceCrack—a complete or incomplete separation, of either concrete or masonry, into two or more parts produced by breaking or fracturing. Cracking of concrete should be reported based on crack widths and the type of crack. 2.1.1 Crack widths—Examples of cracks of varying widths are shown in Fig. 2.1.1(a) and (b).
- Parking Structure Failure and Incidents - American Concrete Institutetee construction. On May 1, 2015, part of a three-level structure at the Watergate complex in Washington, DC, USA, collapsed. The 50-year-old complex was undergoing a major renovation, and a landscaping contractor had piled soil and debris on the top deck. The deck collapsed, taking the lower floors with it. Two people were injured, one ...
- Improving the abrasion resistance of concrete - American Concrete InstituteTo reduce the rate of damage, however, use of a low w/cm and hard, strong aggregates with the largest practical size is recommended. High-strength silica fume concrete has exhibited excellent abrasion resistance under adverse exposure conditions (ACI 210.1R). References: SP-1 (02); ACI 201.2R-16; ACI 302.1R-15; ACI 210R-93; ASTM C418; ASTM C779 ...
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