General Information: Sodium gluconate is the sodium salt of gluconic acid, produced by fermentation of glucose. It is a white to tan, granular to fine, crystalline powder, very soluble in water. Non corrosive, non toxic and readily biodegradable (98% after 2 days), sodium gluconate is more and more appreciated as chelating agent.
Product Name: Sodium Gluconate Technical Grade
Production Origin: Handan TAIXING Biological Chemical Co., Ltd.
HS Code: 2918160000
Molecular formula: G6H11NaO7
molecular weight: 218.14
Properties: white crystalline powder, odorless, slightly soluble in ethanol (25 ℃) 50g/100ml water
Standard: FAO/WHO 24 Edition of the standard United States
Pharmacopoeia; Enterprise Standard
Content: 98.0- 99.5%
Chloride: <680PPM
Sulfate: <400PPM
Heavy Metals: <19PPM
Lead: <8PPM
Arsenic: <2PPM
Reduction of material: <0.4%
PH value: 6.5-7.5 (10% aqueous solution)
Packaging: 25 kg /woven bag lined with PE liner;
Min. Order: 20ton
Application of Sodium Gluconate in Concrete Industry
1. The Effect on the time-correlated Slump of concrete:
FORM 1. The Effect of Sodium Gluconate on Slump of Concrete and Slump loss
|
Dosage/% |
Initial Slump /mm |
0.5hSlump/mm |
1hSlump/mm |
|
0 |
190 |
160 |
130 |
|
0.03 |
215 |
180 |
130 |
|
0.05 |
220 |
190 |
170 |
|
0.07 |
220 |
230 |
230 |
|
0.10 |
240 |
240 |
230 |
|
0.15 |
230 |
240 |
240 |
In a certain water cement ratio, as the increasing of sodium gluconate dosage, the time-correlated slump loss of concrete reduces a lot and even no slump loss as FORM 1 shows. It proves the excellent plasticizer of sodium gluconate.
2. The Effect on the Setting Time of Concrete:
The Effect of sodium gluconate of different dosage on the setting time of concrete as FORM 2:
FORM 2. The Effect of Sodium Gluconate on Setting Time of Concrete
|
Dosage/% |
Initial Setting Time/（h/min） |
Final Setting Time/（h/min） |
|
0 |
11h/10min |
16h/50min |
|
0.03 |
14h/10min |
18h/30min |
|
0.05 |
28h/20min |
27h/30min |
|
0.07 |
25h/10min |
37h/40min |
|
0.10 |
28h/30min |
41h/10min |
|
0.15 |
35h/20min |
72h/30min |
It is easy to conclude from FORM 2 that the setting time of concrete, either initial setting time or final setting time, is prolonged a lot.
3. The Effect on the Concrete Strength:
FORM 3. The Effect of Sodium Gluconate on the Concrete Strength
|
Dosage/% |
3d/mpa |
7d/mpa |
28d/mpa |
60d/mpa |
|
0 |
21.2 |
30.6 |
40.5 |
44.7 |
|
0.03 |
19.8 |
31.4 |
35.4 |
41.8 |
|
0.05 |
22.3 |
30.9 |
44.7 |
47.1 |
|
0.07 |
20.6 |
34.2 |
46.8 |
52.3 |
|
0.10 |
12.1 |
29.0 |
36.2 |
40.9 |
|
0.15 |
-- |
19.5 |
25.6 |
26.5 |
As FORM 3 shows, there is a best dosage of sodium gluconate towards concrete strength. When it is 3d, 0.05% dosage of sodium gluconate results the best concrete strength; when it is 7d, 28d and 60d, 0.07% dosage of sodium gluconate results the best concrete strength. The less dosage of sodium gluconate mainly affect the concrete strength 3d ago, which means that it has little effect on the concrete strength later; when the dosage is much more, it does not only affect the concrete strength 3d ago, but also affects concrete strength after 3d. Therefore, the concrete strength will increase by increasing the dosage of sodium gluconate, but the concrete strength will fall when the dosage exceeds the best dosage.