Chapter 4Chapter 4

Ordinary ConcreteOrdinary Concrete

BindingBinding material materialBindingBinding material materialConcreteConcreteConcreteConcrete

Portland cementPortland cement

concreteconcrete

Portland cementPortland cement

concreteconcrete

Gypsum ConcreteGypsum ConcreteGypsum ConcreteGypsum Concrete

Asphalt ConcreteAsphalt ConcreteAsphalt ConcreteAsphalt Concrete

In Portland cement concrete, the binder is a mixture of Portland cement and water. Asphalt and other cements are used to make various types of concrete, but common usage of the term “concrete” refers to Portland cement concrete.

§4.1.4 Classification of Concrete§4.1.4 Classification of Concrete§4.1.4 Classification of Concrete§4.1.4 Classification of Concrete

ConcreteConcreteConcreteConcrete

ApparentApparent

densitydensity

ApparentApparent

densitydensity

Lightweight Lightweight

ConcreteConcrete

Lightweight Lightweight

ConcreteConcrete

Normal concreteNormal concreteNormal concreteNormal concrete

Heavy concreteHeavy concreteHeavy concreteHeavy concrete

According to According to apparent density ρapparent density ρ0, 0,

there are three types there are three types of concrete:of concrete:

Lightweight ConcreteLightweight ConcreteNormal concreteNormal concreteHeavy concreteHeavy concrete

Classification of ConcreteClassification of ConcreteClassification of ConcreteClassification of Concrete

Normal concrete:ρ0=2000-2500Kg/m3

Load-bearing materials Lightweight Concrete:ρ0 ＜ 1900Kg/m3

Including:Light aggregate concrete: such as Ceramsite con

crete Porous concreteBig hole concrete

Heavy concrete: ρ0 ＞ 2600Kg/m3

Shielding materials of atomic energy engineering

Classification of ConcreteClassification of ConcreteClassification of ConcreteClassification of Concrete

StrengthStrengthStrengthStrengthConcreteConcreteConcreteConcrete

Ordinary concreteOrdinary concreteOrdinary concreteOrdinary concrete

Super-strengthSuper-strength

ConcreteConcrete

Super-strengthSuper-strength

ConcreteConcrete

High-strength High-strength

ConcreteConcrete

High-strength High-strength

ConcreteConcrete

Classification of ConcreteClassification of ConcreteClassification of ConcreteClassification of Concrete

Ordinary concreteOrdinary concrete: Compressive strength <60 MPa. High-strength concreteHigh-strength concrete: Compressive strength>60 MPa.

It is applied largely to the high- rise building, large span bridge and high-strength prefabrication component and so on. Super-strength concreteSuper-strength concrete: Compressive strength>80 MPa. O.CO.C

H.S.CH.S.C

S.S.CS.S.C

Compressive strengthCompressive strengthCompressive strengthCompressive strength

6060

8080

MPaMPaMPaMPa

Classification of ConcreteClassification of ConcreteClassification of ConcreteClassification of Concrete

By forming or construction

technology: Deposit concrete Precast concrete Premixed concrete Shotcrete concrete

Forming or constructionForming or construction

TechnologyTechnology

Forming or constructionForming or construction

TechnologyTechnologyConcreteConcreteConcreteConcrete

Classification of ConcreteClassification of ConcreteClassification of ConcreteClassification of Concrete

Precast concrete

Deposit concrete

Shotcrete concrete