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Τι (ποιος) είναι condulet reducer - ορισμός
ADMIXTURE DECREASING THE WATER CONTENT OF CONCRETE
Water Reducer
Reducing agent
ELEMENT OR COMPOUND THAT LOSES (OR "DONATES") AN ELECTRON TO ANOTHER CHEMICAL SPECIES IN A REDOX CHEMICAL REACTION; LOSING ELECTRONS,OXIDIZED,"REDUCES" (ARE "OXIDIZED" BY) OXIDIZERS (OXIDIZING AGENTS)
Reductant; Reducing ion; Reduction agent; Reducing Agents; Reducing agents; Reduction half reaction; Reducing Agent; Reducer (chemistry)
In chemistry, a reducing agent (also known as a reductant, reducer, or electron donor) is a chemical species that "donates" an electron to an (called the , , , or ).
Telecompressor
OPTICAL ELEMENT ON A CAMERA THAT REDUCES FOCAL LENGTH AND WIDENS EFFECTIVE APERTURE
Speedbooster; Rich-field adapter; Focal reducer; Speed booster
A telecompressor or focal reducer is an optical element used to reduce focal length, increase lens speed, and in some instances improve optical transfer function (OTF) performance. It is also widely known under the name “Speed Booster”, which is the commercial name of a line of telecompressors by the manufacturer Metabones.
reducing agent
ELEMENT OR COMPOUND THAT LOSES (OR "DONATES") AN ELECTRON TO ANOTHER CHEMICAL SPECIES IN A REDOX CHEMICAL REACTION; LOSING ELECTRONS,OXIDIZED,"REDUCES" (ARE "OXIDIZED" BY) OXIDIZERS (OXIDIZING AGENTS)
Reductant; Reducing ion; Reduction agent; Reducing Agents; Reducing agents; Reduction half reaction; Reducing Agent; Reducer (chemistry)
¦ noun Chemistry a substance that tends to bring about reduction by being oxidized and losing electrons.
Βικιπαίδεια
Water reducer
Water reducers are special chemical products added to a concrete mixture before it is poured. They are from the same family of products as retarders. The first class of water reducers was the lignosulfonates which has been used since the 1930s. These inexpensive products were derived from wood and paper industry, but are now advantageously replaced by other synthetic sulfonate and polycarboxylate, also known as superplasticizers.
Water reducers offer several advantages in their use, listed below:
- reduces the water content by 5-10%
- decreases the concrete porosity
- increases the concrete strength by up to 25% (as less water is required for the concrete mixture to remain workable)
- increases the workability (assuming the amount of free water remains constant)
- reduces the water permeability (due to less water being used)
- reduces the diffusivity of aggressive agents in the concrete and so improves the durability of concrete
- gives a better finish to surfaces (due to all of the above)
