What is an Admixture | Functions of Admixtures ...
May 11, 2013· Chemical Admixtures In Concrete . Functions of Admixture. As explained above, admixtures are added to modify concrete properties. Major functions and advantages of using admixtures are detailed below. To improve workability of fresh concrete; To improve durability by entrainment of air; To reduce the water required
IS 9103 (1999): Specification for Concrete Admixtures
entraining admixtures including superplasticizers, solid or liquid or emulsion, to be added to cement concrete at the time of mixing so as to achieve the desired property in concrete, in the plastic or hardened state. 1.2 The different types of admixtures covered in this standard are as follows:
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Concrete production is the process of mixing together the various ingredients—water, aggregate, cement, and any additives—to produce concrete. Concrete production is time-sensitive. Once the ingredients are mixed, workers must put the concrete in place before it hardens.
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Concrete installation is not nearly as straightforward as it seems. There is a wealth of preparation that occurs before a single drop of concrete is ever poured onto the site. Everything from the mix design, quantity of concrete to purchase, site preparation, tools, weather forecast, placement process, form removal and curing process need to be … Continue reading "Top 16 Mistakes People Make ...
Admixtures or additives such as pozzolans or superplasticizers are included in the mixture to improve the physical properties of the wet mix or the finished material. Various types of concrete are manufactured these days for construction of buildings and structures.
Concrete''s strength may also be affected by the addition of admixtures. Admixtures are substances other than the key ingredients or reinforcements which are added during the mixing process. Some admixtures add fluidity to concrete while requiring less water to be used. An example of an admixture which affects strength is superplasticizer.
Superplasticizers (SP''s), also known as high range water reducers, are additives used in making high strength concrete. Plasticizers are chemical compounds that enable the production of concrete with approximately 15% less water content. Superplasticizers allow reduction in water content by 30% or more. These additives are employed at the level of a few weight percent.
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Formulated to reduce the risk of surface shrinkage cracks, Sakrete Crack Resistant Concrete Mix is a professional strength blend of cementitious materials, sands, stone and fibers. For repair and building jobs where concrete thickness exceeds 2".