CAS 8061-52-7 Calcium Lignosulfonate Surfactant In Concrete Brown Powder

The role of Calcium Lignosulfonate in concrete Brown powder

Calcium Lignosulphonate

Calcium lignosulfonate as water reducing agent for concrete
Calcium lignosulfonate can be used as an admixture of polymers and concrete, which has the advantages of low cost, high efficiency, strong market competitiveness and environmental protection. At present, the construction industry is the largest demand for sodium lignosulfonate industry. This is because it has excellent properties such as high water reduction, low slump loss, high strength and slow setting. It can adsorb dispersed cement and improve various physical properties of concrete. In addition, lentisulfonate powder can also be prepared into early strength agent, retarder, antifreeze, pumping agent and so on.

Most of the water reducing agents of concrete are surfactants. Therefore, the mechanism of action of calcium lignosulfonate is surface activity.

After adding calcium lignosulfonate to the concrete, the hydrophobic group of the superplasticizer is directly-adsorbed on the surface of the cement particles, and the hydrophilic group points to the aqueous solution to form a single molecule or multi-molecule adsorption film, so that the cement particles have the same surface. The charge is repelled and dispersed, and excess water is released from between the particles, achieving the purpose of water reduction. At the same time, due to the reduction of the surface tension of water and the interfacial tension between the cement particles, the water consumption is correspondingly reduced under the condition of maintaining the same fluidity, which also plays a role in water reduction. Calcium lignosulfonate can greatly reduce the hydration of concrete, reduce the porosity, increase the compactness of concrete, and greatly improve the strength and impermeability of concrete.

The amount of lignin water-reducing agent added in concrete and the main performance indicators

1 Improve concrete performance: when the amount of cement is the same, the slump is similar to blank concrete, the water consumption can be reduced by 10-15%, the strength of 28 days is increased by 10-20%, and the strength of 1 year is increased by about 10%.

2, saving the amount of cement: when the strength and slump of concrete are similar, it can save about 10% of cement, and the use of 1 ton of water-reducing agent can save 30-40 tons of cement.

3, improve the workability of concrete: when the amount of cement and water consumption of concrete is unchanged, the slump of low-plastic concrete can be increased by about twice, (from 3-5cm to 8-18cm), and the early strength is basically close to the unmixed.

4. Lignin has retarding effect: After adding 0.25% lignin water-reducing agent, when the slump of concrete is basically the same, the initial setting time of ordinary cement is delayed 1-2 hours, the slag cement is 2-4 hours, the final setting time of ordinary cement is 2 hours, and the slag cement is 2-3 hours, if the slump is increased without reducing the water consumption, Or maintain the same slump to save the amount of cement, the setting time delay is greater than the water reduction.

5, can reduce the early hydration heat of cement: the time of exothermic peak is delayed than that of unmixed, ordinary cement is about 3 hours slag cement is about 8 hours, dam cement is more than 11 hours, and the maximum temperature of the exothermic peak is slightly lower than that of the other, slag cement and dam cement are lower than 3℃

6. The gas content of concrete has increased: the gas content of blank concrete is about 1%, and the gas content of concrete doped with 0.25% lignin is about 2.3%.

7. Reduced bleeding rate: When the slump of concrete is basically the same, the bleeding rate of lignin-doped concrete can be reduced by more than 30% compared with that of undoped concrete. In the case of keeping the water-cement ratio unchanged and increasing slump, the bleeding rate also decreases due to the hydrophilicity of lignin and the introduction of air.

8, dry shrinkage performance: the initial (1-7) days compared with the unadded water reducer, basically close to or slightly reduced, 28 days and later (except for saving cement), slightly increased, but the increase value did not exceed 0.01%(0.01mm/m)

9, improve the compactness of concrete, improve the permeability of concrete. Increased from B= Level 6 to B= level 12-30.

10, no chlorine salt, no corrosion damage to the steel bar.

Package and Storage:
(1)The product comes in the form of powdery.The powdery form is packed in PE/PP woven bags, 25kg/package; Jumbo bag.
(2)keep away from moisture.
(3)The product is non-flammable, non-toxic, non-explosive, and can be stored for a long time.

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