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2. Double tee - Wikipedia

   en.wikipedia.org/wiki/Double_tee

   The floor systems are mostly built from pre-topped double tees. This system evolved from the earlier use of tee systems where the flanges of the T-beams were connected. The concrete is then poured at the top of the tees during the construction to create the floor surface, hence the process is called field-placed concrete topping.

3. American Concrete Institute - Wikipedia

   en.wikipedia.org/wiki/American_Concrete_Institute

   The American Concrete Institute (ACI, formerly National Association of Cement Users or NACU) is a non-profit technical society and standards developing organization. ACI was founded in January 1905 during a convention in Indianapolis.

4. Flange - Wikipedia

   en.wikipedia.org/wiki/Flange

   A flange is a protruded ridge, lip or rim, either external or internal, that serves to increase strength (as the flange of a steel beam such as an I-beam or a T-beam); for easy attachment/transfer of contact force with another object (as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of a camera); or for stabilizing and guiding the movements of a machine or its ...

5. Closet flange - Wikipedia

   en.wikipedia.org/wiki/Closet_flange

   Closet flanges are typically made of brass, cast iron, ABS, PVC, and lead. In a typical installation, the closet flange is mounted on top of the floor with the hub fused around the drain pipe. A wax ring (or waxless) is used to seal the gap between the flange and the bottom of the toilet. The toilet is bolted to the flange, not to the floor.

6. Alkali–silica reaction - Wikipedia

   en.wikipedia.org/wiki/Alkali–silica_reaction

   ASTM C1293: "Test Method for Concrete Aggregates by Determination of Length Change of Concrete Due to Alkali-Silica Reaction". It is a long-term confirmation test (1 or 2 years) at 38 °C in a water-saturated moist atmosphere (inside a thermostated oven) with concrete prisms containing the aggregates to be characterised mixed with a high-alkali ...