Brief Introduction

Fired Brick

Autoclaved Brick

§6.2 Wall Bricks§6.2 Wall Bricks

Fired Brick

Fired Common Brick

Fired Hollow Brick

Fired Porous Brick

Limit to use

•small size •heave weight•energy inefficiency •lots of soil consumption

Fired Common Brick

Fired common brick is small size, heave weight, energy inefficiency and lots of soil consumption. So, it is used under strict regulations now.

Technical standard: GB 5101-2003

Appearance, size, strength, weathering-resistance must meet its demands

Strength Grade

It can be divided into five grades according to fave and fk or fmin

fk= fave-1.8S

Fired Common Brick

FormulaFormula

f

sδ

210

1

)(9

1

i

ifS f

variable coefficientvariable coefficient

standard deviationstandard deviation

Fired Common Brick

Permit to use

Fired Hollow Brick

Fired Porous Brick

light- weightlight- weight

Contain less clayContain less clay

Fired porous brick and hollow brick are light weigh and contain less clay. So, they are permitted to use now.

It is fired, mainly made up of clayHole rate is 15% at least It has many tiny holes hole and pressed side are vertical

By appearance, size,Strength grades , durability

Top-rate

First-rate

Qualified-rate

• Technical standard: GB 13544 -2000• By appearance, size, strength grades, durability• It is classified into: top-rate, first-rate and qualified-rate

Mu7.5

Mu10

Mu15

Mu20

Mu25

Mu30

By compressive By compressive

strength, strength,

flexural loadflexural load

• By compressive strength and flexural load• It is classified into 6 strength grades(Tab.6.2.1)

Tab. 6.2.1 Strength Grades of Fired Porous Brick

product grades

strength grade

compressive strength（ MPa ）

flexural load（ KN ）

the minimu

m of average value

the minimum

of minimum value of single

the minimu

m of average value

the minimum

of minimum value of single

top-rate

30 30.0 22.0 13.5 9.0

25 25.0 18.0 11.5 7.5

20 20.0 14.0 9.5 6.0

first-rate

15 15.0 10.0 7.5 4.5

10 10.0 6.0 5.5 3.0

qualified-rate

7.5 7.5 4.5 4.5 2

Applications

Fired porous brick can be usedFired porous brick can be used

in load-bearing structure below six floors.in load-bearing structure below six floors.

Fired Hollow BrickThe process and material are

the same with the above one.Hole rate is 35% at least It has

little big holeshole and pressed side are parallel

1-Tip Side, 2-Large Side, 3-Bar Side,

L-Length,

b-Width,

d-thickness

4-Rib,

5-Concave-line Slot,

6-Ektexine

1100 900

800

Apparent

Density

• Technical standard: GB 13545 -2003• By apparent density• It is classified into: 800, 900 and 1100

Strength Grades

• Technical standard: GB 13545-2003

• By compressive strength average value of large side, bar side and minimum value of single

• It is classified into three strength grades: 5.0, 3.0 and 2.0.

Product Grades

• Technical standard: GB 13545 -2003

• By appearance, size, strength grades, durability

• It is classified into: top-rate, first-rate and qualified-rate(Tab.6.2.2)

Tab.6.2.2 Strength Grades of Fired Hollow Brick

Product Grades

Strength

Grades

Compressive Strength of Large Area （ MP

a ）

Compressive Load of Bar Area

（ MPa ）

the minimu

m of average value

the minimum

of minimum value of single

the minimu

m of average value

the minimum

of minimum value of single

Top-rate 5.0 5.0 3.7 3.4 2.3

First-rate 3.0 3.0 2.2 2.2 1.4

Quanlified-rate

2.0 2.0 1.4 1.6 0.9

Applications

Fired hollow brickFired hollow brick can be used in can be used in non-load-bearing wall, such asnon-load-bearing wall, such as

interior partition of multi-layer structure filling-wall of frame structure