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Figure 2: Change of pressure during bubble formation plotted as a function of added volume. Initially a bubble appears on the end of the capillary. As the size increases, the radius of curvature of the bubble decreases. At the point of the maximum bubble pressure, the bubble has a complete hemispherical shape whose radius is identical to the ...
Slabs are one of the greatest consumers of concrete in many buildings, [14] so reducing the slab mass can make a relatively large difference to the environmental impact of a building's construction. Biaxial slabs may be marginally cheaper than solid slabs, partly due to the lower mass.
Figure 2. Increase of the pressure with respect of time in steps, holding the actual pressure for a certain time before increasing it to the next value. The pressure/step stability method [4] represents an alternative for the pressure scan method which permits a more accurate measurement of the pore sizes. It takes into account the different ...
In civil engineering, concrete leveling is a procedure that attempts to correct an uneven concrete surface by altering the foundation that the surface sits upon. It is a cheaper alternative to having replacement concrete poured and is commonly performed at small businesses and private homes as well as at factories, warehouses, airports and on roads, highways and other infrastructure.
Air entrainment in concrete is the intentional creation of tiny air bubbles in a batch by adding an air entraining agent during mixing. A form of surfactant (a surface-active substance that in the instance reduces the surface tension between water and solids) it allows bubbles of a desired size to form.
A pervious concrete street in 2005. Pervious concrete (also called porous concrete, permeable concrete, no fines concrete and porous pavement) is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater recharge.
Experimental demonstration of Laplace pressure with soap bubbles. The Laplace pressure is the pressure difference between the inside and the outside of a curved surface that forms the boundary between two fluid regions. [1] The pressure difference is caused by the surface tension of the interface between liquid and gas, or between two ...
Small charges of concrete can be added while the base is being formed [6] to enlarge the base and improve the pile’s settlement performance. [3] Franki piles can be installed raked (or sloped) with a tilt of up to 4:1. [5] Raked Franki piles are always reinforced and are particularly suitable for structures subject to dynamic forces. [1]