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PMMA ignites at 460 °C (860 °F) and burns, forming carbon dioxide, water, carbon monoxide, and low-molecular-weight compounds, including formaldehyde. [17] PMMA transmits up to 92% of visible light (3 mm (0.12 in) thickness), [18] and gives a reflection of about 4% from each of its surfaces due to its refractive index (1.4905 at 589.3 nm). [3]
201 concrete steps rise about 100 feet to the intersection of Upper Mesa Road and Amalfi Drive. There is no railing except for the topmost 18 steps, so descending requires caution. (The stairs are sometimes incorrectly called the "La Mesa stairs"--La Mesa Drive is elsewhere in Santa Monica, and there is a La Mesa Stairway in the city of La Mesa ...
Gypsum concrete is lightweight and fire-resistant. A 1.5-inch slab of gypsum concrete weighs 13 pounds per square foot versus 18 pounds per square foot for regular concrete. [10] Even though gypsum concrete weighs less, it still has the same compressive strength as regular concrete, based on its application as underlayment or top coat flooring ...
The alternating stairs (3) requires one unit of space per step: the same as the half-width stairs (2), and half as much as the full-width stairs (1). Thus, the horizontal distance between steps is in this case reduced by a factor of two, reducing the size of each step.
The typical sizes of double tees are up to 15 feet (4.6 m) for flange width, up to 5 feet (1.5 m) for web depth, and up to 80 feet (24 m) or more for span length. Double tees are pre-manufactured from prestressed concrete which allows construction time to be shortened.
This step is analogous to the industrial route to acrylonitrile, a related commodity chemical. MAN can be hydrated by sulfuric acid to methacrylamide: CH 2 =C(CH 3)CN + H 2 SO 4 + H 2 O → CH 2 =C(CH 3)−CONH 2 ·H 2 SO 4 CH 2 =C(CH 3)−CONH 2 ·H 2 SO 4 + CH 3 OH → CH 2 =C(CH 3)COOCH 3 + NH 4 HSO 4
Diagram shows slab and rib width with rules of thumb formula. Slab depth is typically 75 mm (3 in) to 130 mm (5 in) thick. [5] [3] As a rule of thumb, the depth should be 1 ⁄ 24 of the span. [5] The width of the ribs is typically 130 mm (5 in) to 150 mm (6 in), and ribs usually have steel rod reinforcements. [5]
The regulation contains a detailed set of rules that must be followed when installing new steps in settings like municipal buildings, industrial plants, schools, etc. Perhaps the most recognizable standard in California's Title 24 building code is the need for a slip-resistant tread or nosing that is of contrasting color from the steps.