Ads
related to: tiny air bubbles concrete
Search results
Results From The WOW.Com Content Network
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.
Unlike air-entrained concrete, which introduces tiny air bubbles through an admixture during mixing, foam concrete replaces coarse aggregates with these air bubbles, resulting in a significant difference in density, with foam concrete typically ranging from 400 kg/m3 to 1600 kg/m3, whereas air-entrained concrete maintains its density.
Adding an air entrainment agent during the mixing of fresh concrete induces the formation of tiny air bubbles in the fresh concrete slurry. This creates numerous small air-filled micro-cavities in the hardened concrete serving as empty volume reserve to accommodate the volumetric expansion of ice and delays the moment tensile stress will develop.
The answer: They trap air bubbles. Argyroneta aquatic spiders, for instance, can create an underwater web, shaped like a dome, by filling it with air with their superhydrophobic legs and abdomens.
Air entraining agents add and entrain tiny air bubbles in the concrete, which reduces damage during freeze-thaw cycles, increasing durability. However, entrained air entails a tradeoff with strength, as each 1% of air may decrease compressive strength by 5%. [ 54 ]
Air entrainment, the intentional creation of tiny air bubbles in concrete; Brainwave entrainment, the practice of entraining one's brainwaves to a desired frequency; Entrainment (biomusicology), the synchronization of organisms to an external rhythm
For premium support please call: 800-290-4726 more ways to reach us
In hydraulic engineering, air bubble entrainment is defined as the entrapment of air bubbles and pockets that are advected within the turbulent flow. [1] The entrainment of air packets can be localised or continuous along the air–water interface. Examples of localised aeration include air entrainment by plunging water jet and at hydraulic ...