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2. Concrete sealer - Wikipedia

   en.wikipedia.org/wiki/Concrete_sealer

   In past decades attempts to protect concrete have included sealers ranging from wax to linseed oil. Today, high quality concrete sealers can block up to 99% of surface moisture. There are two main sealer categories: topical sealers (coatings) and penetrating sealers (reactive).

3. Sealant - Wikipedia

   en.wikipedia.org/wiki/Sealant

   Sealant is a substance used to block the passage of fluids through openings in materials, [1] a type of mechanical seal. In building construction sealant is sometimes synonymous with caulk (especially if acrylic latex or polyurethane based) [ 2 ] and also serve the purposes of blocking dust, sound and heat transmission.

4. Concrete slab - Wikipedia

   en.wikipedia.org/wiki/Concrete_slab

   A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Steel- reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving ( see below ).

5. Road surface - Wikipedia

   en.wikipedia.org/wiki/Road_surface

   Concrete roadway in San Jose, California A concrete road in Ewing, New Jersey. Concrete surfaces (specifically, Portland cement concrete) are created using a concrete mix of Portland cement, coarse aggregate, sand, and water. In virtually all modern mixes there will also be various admixtures added to increase workability, reduce the required ...

6. Removal of Confederate monuments and memorials - Wikipedia

   en.wikipedia.org/wiki/Removal_of_Confederate...

   Chart of public symbols of the Confederacy and its leaders as surveyed by the Southern Poverty Law Center, by year of establishment [note 1]. Most of the Confederate monuments on public land were built in periods of racial conflict, such as when Jim Crow laws were being introduced in the late 19th century and at the start of the 20th century or during the civil rights movement of the 1950s and ...

7. Iowa-class battleship - Wikipedia

   en.wikipedia.org/wiki/Iowa-class_battleship

   The Iowas had heavily protected main battery turrets, with 19.5-inch (495 mm) Class B and STS face, 9.5-inch (241 mm) Class A sides, 12-inch (305 mm) Class A rear, and 7.25-inch (184 mm) Class B roof. The turret barbettes' armor is Class A with 17.3 inches (439 mm) abeam and 11.6 inches (295 mm) facing the centerline, extending down to the main ...