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Superplasticizers allow reduction in water content by 30% or more. These additives are employed at the level of a few weight percent. Plasticizers and superplasticizers also retard the setting and hardening of concrete. [1] According to their dispersing functionality and action mode, one distinguishes two classes of superplasticizers:
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
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.
Concrete Industry Management (CIM) is a business program that has been developed specifically for the concrete industry to provide students with a four-year Bachelor of Science degree in Concrete Industry Management. [1] [2] The program gives students entering the concrete work force industry experience early in their careers. Supported by ...
However, most HPFRCCs include at least the following ingredients: fine aggregates, a superplasticizer, polymeric or metallic fibers, cement, and water. Thus the principal difference between HPFRCC and typical concrete composition lies in HPFRCCs' lack of coarse aggregates. Typically, a fine aggregate such as silica sand is used in HPFRCCs.
The structural integrity of CLASP buildings are strong and robust, the design being based on; strong concrete foundations, metal framing supports and concrete cladding give the building a unlimited lifetime timeframe (with small maintenance carried out). It is these design fundamentals of CLASP that can allow buildings to last over a hundred years.
The road construction and maintenance industry consumes tons of carbon-intensive concrete every day to secure road-side and urban infrastructure. As populations grow this infrastructure is becoming increasingly vulnerable to impact from vehicles, creating an ever increasing cycle of damage and waste and ever increasing consumption of concrete ...
Concrete has a very low coefficient of thermal expansion, and as it matures concrete shrinks. All concrete structures will crack to some extent, due to shrinkage and tension. Concrete which is subjected to long-duration forces is prone to creep. The density of concrete varies, but is around 2,400 kilograms per cubic metre (150 lb/cu ft). [1]