AOWO ® Reinforcing Concrete Agent
Introduction
Reinforcing Concrete Agent is a high strengthening admixture in concrete that made by low pressure steam curing and replaced by cement about 20~30%.
Hydration Properties
Reinforcing Concrete Agent increases the hydrated such as calcium silicate hydrates(C-S-H）and ettringate (3CaO·Al2O3·3CaSO4·32H2O）
Reinforcing Concrete Agent improves the strength and durability due to decreased the void of hardened concrete by these hydration products.
The Characteristics of Reinforcing Concrete Agent
Development of the early high strength for PHC.
Over 800kg/m2 in 3 days by low pressure steam curing.
High durability
-High freezing and thawing resistance.
-High chemical resistance.
-High sea water resistance.
No need of autoclave curing apparatus.
Chemical properties of Reinforcing Concrete Agent
Elements |
Chemical Formulate |
Quantity（wt%） |
Typical Range（wt%） |
Silicate |
SiO2 |
28.0 |
25~35 |
Aluminates |
Al2O3 |
13.3 |
5~15 |
Ferrites |
Fe2O3 |
0.9 |
Less than 3 |
Calcium oxide |
CaO |
41.8 |
35~50 |
Magnesium oxide |
MgO |
5.2 |
3~10 |
Sulfur oxide |
SO3 |
8.9 |
5~20 |
Loss on ignition |
|
0.3 |
Less than 5 |
Physical Properties of Reinforcing Concrete Agent
Blaine Fineness |
7800±200cm2/g |
Bulk density |
900±20kg/m3 |
Specific gravity |
2.90±0.2 |
Moisture content |
Less than 2% |
Loss on ignition |
Less than 5% |
Particle size |
Avg.6.0±1um |
Appearance |
White powder |
Setting Time
Reinforcing Concrete Agent content |
0 wt% |
10 wt% |
20 wt% |
30wt% |
40 wt% |
W/B（wt%） |
25.2 |
25.5 |
25.7 |
26.0 |
26.3 |
Initial setting time
（hr：min） |
3:47 |
3:40 |
3:40 |
3:36 |
3:19 |
Final setting time
（hr：min） |
6:45 |
6:49 |
7:00 |
7:09 |
7:15 |
*setting time was tested according to ASTM C 266-89
B：Cement* Reinforcing Concrete Agent
Mix proportion and compressive strength
W/B
（%） |
S/a
(%) |
Slump（cm） |
Unit weight（kg/m3） |
Compressive
Strength （kg/cm2） |
W |
C |
Reinforcing Concrete Agent |
S |
G |
Sp |
1d |
7d |
28d |
23.5 |
33 |
5±2 |
127 |
389 |
151 |
577 |
1217 |
9.72 |
766 |
839 |
880 |
C: Cement（Sp. Gr.=3.15）
Reinforcing Concrete Agent（Sp. Gr.=2.90）
S：Sand（Sp. Gr.=2.70，F.M.=2.71）
G：Gravel（Sp.Gr.=2.70，F.M.=6.70，Max. Size：20mm）
Sp: Superplasticizer
The Low pressure steam curing schedule
The centrifugal condition
| Centrifugal Force（g） |
3 |
8 |
17 |
37 |
Time（min） |
3 |
1 |
1 |
5 |
The mixing techniques
Case |
Dry mixing |
Wet mixing |
Compressive strength （kg/cm2） |
1d |
7d |
28d |
1 |
60 |
60 |
766 |
839 |
873 |
2 |
- |
90 |
766 |
835 |
880 |
The merit of case 2：
*decrease coating trouble in mixer shaft
*low cost of electric power
*high productivity
The schedules of a low pressure steam curing
condition |
Pre-steam period |
Temp. rising
period |
Max. temp. Maintenance period |
Compressive strength（kg/cm2） |
1d |
7d |
28d |
I |
Time（hr） |
3 |
3 |
5 |
766 |
835 |
880 |
Temp.（℃） |
35 |
|
85 |
II |
Time（hr） |
3 |
1 |
7 |
668 |
819 |
882 |
Temp.（℃） |
35 |
|
60 |
Temperature range of condition II is about 35℃ at day and 20-30℃ at night.
The measurement of bending moments
φ400mm |
Bending moments |
Crack |
Rupture |
JIS A 5337 |
5.5 |
8.3 |
measurements |
7.5(130%) |
14.1(170%) |
|
