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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. Expansion joint - Wikipedia

   en.wikipedia.org/wiki/Expansion_joint

   A joint replacing mortar with elastomeric sealant will absorb the compressive forces without damage. [4] Concrete decking (most typically in sidewalks) can suffer similar horizontal issues, which is usually relieved by adding a wooden spacer between the slabs. The wooden expansion joint compresses as the concrete expands.

4. Chipseal - Wikipedia

   en.wikipedia.org/wiki/Chipseal

   Chipseal (also chip seal or chip and seal or spray seal) is a pavement surface treatment that combines one or more layers of asphalt with one or more layers of fine aggregate. In the United States, chipseals are typically used on rural roads carrying lower traffic volumes, and the process is often referred to as asphaltic surface treatment .

5. 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.

6. Sealcoat - Wikipedia

   en.wikipedia.org/wiki/Sealcoat

   Again, refined tar-based sealer offers the best wear characteristics (typically 3–5 years) while asphalt-based sealer may last 1–3 years. Petroleum-based sealer falls between refined tar and asphalt. There are concerns about pavement sealer polluting the environment after it is abraded from the surface of the pavement.

7. Francis Scott Key Bridge collapse - Wikipedia

   en.wikipedia.org/wiki/Francis_Scott_Key_Bridge...

   A resident living near the bridge recalled being awakened by deep rumbling that shook his residence for several seconds following the collapse, which he said "felt like an earthquake". [ 66 ] Emergency teams began receiving 911 calls at 1:30 a.m. [ 57 ] The Baltimore Police Department was alerted to the collapse at 1:35 a.m. Large rescue and ...