Wuhan Anji Taineng Environmental Sci-Tech Co., Ltd
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The role of Calcium Lignosulfonate in concrete Brown powder CAS 8061-52-7
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.
Therefore, the use of lignin water-reducing agent in concrete can reduce the water consumption of concrete mix, reduce the water-cement ratio, improve workability, is conducive to pumping, and improve the strength, compactness and durability of concrete.
| NO | Index items | Standard value | Test Results |
| 1 | Appearance | Brown powder | Meets the requirement |
| 2 | PH Value | 6-8 | 7.24 |
| 3 | Dry matter | 93%min | 95.21 |
| 4 | Moisture | 7%max | 4.79 |
| 5 | Water insoluble matter | 2.0% max | 1.17 |
| 6 | Lignosulphonate | 55%min | 57.19 |
| 7 | Total reducing matter | 10% max | 6.16 |
The effects of Calcium Lignosulfonate on the properties of concrete mix are shown in the following aspects:
①. Due to the adsorption, dispersion, electrical property, surface free energy reduction of calcium lignesulfonic acid and other effects, so that the free water in the flocculation structure of the water released, the electrical repulsion between the cement particles, hydration film lubrication, the lubrication effect of bubbles to increase the rheological properties of cement slurry, thus improving the working ability of concrete, using the same amount of water slump increase.
②.The water consumption of mixing can be reduced by 8% under the condition of maintaining the same slump.
③ It can maintain the plasticity of concrete for a long time and reduce the slump loss from mixing to pouring. When the standard dosage is used, the initial and final setting time of ordinary Portland cement can be delayed by 1~2h, and the slag Portland cement can be delayed by 2~4h and 2~3h, respectively.
④ The adsorption film formed by the surface adsorption of calcium lignosulfonate hindered the initial hydration reaction, controlled the rate of hydration heat release, and reduced the height of the peak hydration heat, which could inhibit the large volume
Cracks in concrete and dam concrete caused by hydration and heat release.
⑤ The adsorption of calcium lignosulfonate, air lifting, electrical repulsive force and other effects, so that the settlement of bone particles in concrete slowed down, in the solidification and hardening before maintaining a stable state of suspension, thereby reducing the glendening of concrete and settlement.
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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