PORTLAND STRESS

Pre-Stress & Post-Tension Concrete Admixtures

 

BEWARE : WORLD TRADE CENTER (9/11) DOMIDO FALLING DOWN TRAGEDY

            PORTLAND STRESS The most Importance for Pre-Stress & Post Tension Reinforced Steel is the ability to maintain Internal Tensile Pulling Force in Steel Reinforce Concretes. The Specification of Concrete needed is not only conventional Type A to G of ASTM C 494 Standard Specification of Chemical Admixtures but also need Non-Shrink or a little Expansion Property to increase Steel VS Concrete‘s Fiction for maintain  Internal Tensile Pulling Force and resistance to “CREEP” cause by long term vibration. The New Type “S” of ASTM C 494 Specific for Creep Resistance & Water-reducing, high range admixtures as the following: 

 

ASTM C 494 Standard Specification for Chemical Admixtures for Concrete

Type S

Specific for Creep Resistance & Water Reducing, High Range

Water Content, max, % of control

88

Time of setting, allowable deviation from control h:min:

initial: at least

  not more than

 

 

1:00 earlier nor 1:30 later

Final: at least

not more than

1:00 earlier nor 1:30 later

Compressive strength, min,

% of control:ᴮ

     1 day

     3 days

     7 days

     28 days

     90 days

     6 months

     1 year

 

 

150

135

125

120

115

115

115

Flexural strength, min, % control:ᴮ

     3 days

     7 days

     28 days

 

 

110

100

100

Length change, max

   Shrinkage (alternative

requirements):ᴰ

Percent of control

  Increase over control

Relative durability Factor, minᴱ

 

 

 

135

0.010

80

 

Usage : PORTLAND STRESS  1 dose 100 gram / Cement 1 bag 50 kg

Package :   100 gram/pack, 200 packs/box (you can request of package 1 bag 2 kg or equivalent to 1 ton of cement in order without fee)