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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).
A expansion joint, or movement joint, is an assembly designed to hold parts together while safely absorbing temperature-induced expansion and contraction of building materials. They are commonly found between sections of buildings , bridges , sidewalks , railway tracks , piping systems , ships , and other structures.
Wall Footing . A wall footing or strip footing is a continuous strip of concrete that serves to spread the weight of a load-bearing wall across an area of soil. [1] It is a component of a shallow foundation. [1] Wall Footing. Wall footings carrying direct vertical loads might be designed either in plain concrete or in reinforced concrete.
When hanging shelves on a wall, home designers generally try to ensure that the shelf should be no wider than 1.4 x bracket's width and no wider than 1.2 x bracket's height. [citation needed] Spacing brackets for a long shelf should be no more than 4 x shelf-breadth between each bracket - this holds true for normal materials used at home. [8]
In the hunt: Atlanta Falcons (8-8). The Eagles and Rams are the only teams locked into their seeds. Week 18 results could change the rest of the standings. The Bills will be the No. 2 seed ...
Biden noted steps his administration has taken to combat gun violence, including the passage of the most significant gun-safety legislation in nearly 30 years. “But more is needed,” he said ...
CFP: Nick Saban shares thoughts on bracket: 'My question about all the strength of schedule' College Football Playoff bracket: Easiest path to national championship 1) Georgia The team with the ...
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.
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