Introduction
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Rubber dam is made of high-strength synthetic fabrics and compound rubber, anchored in the concrete foundation to form a sealed air bladder inflated with water or air in dry seasons to store water. In rainy seasons, water or air inside of rubber bladder would be discharged to help release floodwater from river course. Compared with common civil works, the advantages of rubber dam are less engineering budget, shorter construction period, extended service life, simplified maintenance and improved vibration resistance. Rubber dam can be adjusted at any height and overflowed so it is widely used for irrigation, power generation, flood control and urban landscaping in many areas.
      
The rubber bladder is made of strength canvas and rubber layers. The canvas serves as the force-bearing frame of the dam with good flexural stress resistance and excellent adhesion function. The rubber layers consist of out-layer, middle-layer and inner-layer to protect the canvas.

Physical and mechanical properties of the rubber material for making rubber bladder

Item

Unit

Outer layer

Middle layer,Inner layer

Cover rubber sheet

Test standard

Tensile strength at break≥

Mpa

14

12

6

GB/T528-2009

Elongation at break≥

%

400

400

250

GB/T528-2009

Permanent deformation at break≤

%

30

30

35

GB/T528-2009

Hardness(shore A)

55~65

50~60

55~65

GB/T531.1-2008

Brittleness temperature≤

-30

-30

-30

GB/T1682-1994

Hot air aging

(100℃*96h)

Tensile strength at break≥

Mpa

12

10

5

GB/T3512-2001

Elongation at break≥

%

300

300

200

GB/T3512-2001

Hot water aging

(70℃*96h)

Tensile strength at break≥

Mpa

12

10

5

GB/T1690-2010

Elongation at break≥

%

300

300

200

GB/T1690-2010

Volume expansion ratio≤

%

15

15

15

GB/T1690-2010

Ozone aging: 10000pphm, temperature 40℃, stretching 20%, no cracking

min

120

120

100

GB/T7762-2003

Wear loss( Akron) ≤

cm³/1.61km

1.0

1.0

1.2

GB/T1689-1998

Flexibility, no cracking

Ten thousand times

20

20

20

GB/T3934-2006