CONCRETE Flashcards
An artificial stone like building material made by mixing cement and various mineral aggregates with sufficient water to cause the cement to set and bind the entire mass
Concrete
A calcined mbcture of clay and limestone finely pulverized and used as an ingredient in concrete and mortar. The term is frequently used incorrectly for concrete
Cement
A compound constituting about half the volume of portland cement and responsible for the hardening or early gain in strength of the cement
Tricalcium silicate
A compound constituting about one-quarter of the volume of portland cement and responsible for the aging or long term gain in strength of the cement
Dicalcium silicate
A compound constituting about one-tenth of the volume portland cement and responsible for the initlal setting of the cement
Raw materials consist of combinations of limestone,clay,shale,oyster shells,silica and,and iron ore
Raw materials are ground to powder and blended
Burning in a rotary kiln changes raw mixture into cement clinker
Tricalcium aluminate
A fused mass of incombustible matter resulting from heating in a kiln or the burning
Gypsum is added to clinker to retard setting
Clinker is ground into portland cement
Clinker
To heat substance to a high temperature but without melting or fusing to drive off volatile matter or to cause Addition or reduction
calcine
A hydraulic cement made by burning a mixture of clay and limestone in a rotary kiln and pulverizing the resulting clinker into a very fine powder named for its resemblance to a limestone quarried on the isle of portland england
Portland cement
Cement capable of setting and hardening by a reaction with water
Hydraulic cement
A portland cement used for general construction having none of the distinguishing qualities of the other types
Type I:normal
A portland cementr having a reduced content of tricalcium aluminate making it more resistant to sulfates and causing it to generate less heat of hydratlon used in general construction where resistant to moderate sulfate action is required or where heat buildup can be damaging as in the construction of large piers and heavy retaining walls
Type II:moderate
A very finely ground portland cement having an increased content of tricalcium silcate causing it to cure faster and gain strength earlier than normal portland cement used when the early removal of formwork is desired or in cold weather construction to reduce the time required for protection from low temperatures
Type III:high early strength
A portland cement having a reduced content of tricalcium silicate and an increased content of dicalcium silicate causing it to general less heat of hydration than normal portland cement uesd in the construction of massive concrete structures as gravity dams where a large buildup in heat can be damaging
Type IV: low heat
A portland cement having a reduced content of tricalcium aluminate lessening the need for gypusm a sulfate normally added to cement to retard its setting time used where resistance to servere sulfate action is required
Type V:sulfate resisting
A type I,type II or type III portland cement to which a small quantity of an air entraining agent has been interground during manufacture designated by the suffix a as type IA,Type IIA or type IIIA
Air entraining portland cement
