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When atmospheric carbon dioxide (CO 2), or carbonate ions (HCO − 3, CO 2− 3 dissolved in water) diffuse into concrete from its external surface, they react with calcium hydroxide (portlandite, Ca(OH) 2) and the pH of the concrete pore water progressively decreases from 13.5 – 12.5 to 8.5 (pH of water in equilibrium with calcite).
Velocity of sound in water; c in distilled water at 25 °C : 1498 m/s c at other temperatures [8]: 1403 m/s at 0 °C 1427 m/s at 5 °C 1447 m/s at 10 °C 1481 m/s at 20 °C
The District encompasses approximately 10,000 square miles (30,000 km 2) in all or part of 16 counties in west-central Florida including Charlotte, Citrus, DeSoto, Hardee, Hernando, Highlands, Hillsborough, Lake, Levy, Manatee, Marion, Pasco, Pinellas, Polk, Sarasota, and Sumter counties, serving a population of more than 5.5 million people.
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The water diffusion time is thus proportional to the square of its transport distance. As a consequence, the water saturation degree inside thick concrete structures often remains higher than 80%, a level sufficient to provide enough water to the system and to maintain the alkali-silica reaction on going.
A fairly well-defined reaction front can often be observed in thin sections; ahead of the front the concrete is normal, or near normal. Behind the reaction front, the composition and the microstructure of concrete are modified. These changes may vary in type or severity but commonly include: Extensive cracking; Expansion
Sarasota County is a county located in Southwest Florida. At the 2020 US census, the population was 434,006. [2] Its county seat is Sarasota [3] and its largest city is North Port. Sarasota County is part of the North Port–Bradenton–Sarasota, FL metropolitan statistical area. The county includes barriers islands with beaches and beach ...
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