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

The role of Calcium Lignosulfonate in concrete Brown powder

Calcium Lignosulphonate

Calcium lignosulfonate and sodium lignosulfonate superplasticizer are surfactants, which are added to concrete and directionally adsorbed on the surface of cement particles by dry hydrophobic groups, so that the cement has a negative charge. Cement particles with the same charge repel and disperse each other under the action of charge repulsion, and the flocculent structure formed in the initial stage of cement adding water becomes a dispersive structure, and the free water in the coagulated body is released, so as to achieve the purpose of water reducing agent. The results showed that after lignin was added to concrete, more than 80% of the water reducing agent was adsorbed for 5 minutes, and the hydration point center clearly visible under the electron microscope increased significantly, the distribution of hydration compounds was uniform, and the hydrated crystal fibers were longer.

It can be seen that the addition of calcium lignosulfonate, free water evaporation left less pores, the internal structure is dense, that is to say, the reduction of porosity is obviously beneficial to improve the strength of dry concrete, improve the size of the cement pore structure and its distribution, so that the crystal growth rate is delayed, the crystal growth is more adequate, so that more fibrous crystals interpenetrate each other. The formation of a strong network structure, so that the strength of concrete significantly improved.

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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