Sodium Naphthalene Formaldehyde is used as a water reducing agent in concrete

Water reduction is an important effect of surfactant on cement hydration. Water reducing agent does not affect the working condition of concrete, can reduce the unit water consumption; Or under the condition of not changing the unit water consumption, can improve the workability of concrete: or have the above two effects at the same time, and do not significantly change the gas content of the admixture. At present, the use of coagulant 10 water reducing agents are surfactants, belong to the dry anionic surfactant.

After mixing cement and water, hydration reaction, some flocculation-like structure, which is wrapped in a lot of mixing water, thus reducing the workability of the new mixing ten (also known as workability, mainly refers to the fresh concrete in the construction, that is, in the mixing, transportation, watering and other processes can maintain uniform, dense without stratification segregation phenomenon performance). In order to maintain the required workability in the construction, it is necessary to increase the amount of mixing water accordingly, because the increase of water will make the formation of excessive pores in the cement stone structure, thus seriously affecting the physical and mechanical properties of hardened concrete, if the water can be released, the water consumption of concrete can be greatly reduced. In the process of preparation of coagulant, adding a proper amount of water reducing agent can play such a role well.

After adding water reducing agent to concrete, the hydrophobic group of water reducing agent is oriented adsorption on the surface of cement particles, and the hydrophilic group points to aqueous solution, forming a single molecular or multi-molecular layer adsorption film. Due to the directional adsorption of surfactant, the cement granule surface with the same symbol of the charge, so under the action of the same repulsion, not only can make the cement water system in a relatively stable state of suspension, and can make the cement in the initial water formation of flocculation structure dispersion disintegration, so as to release the water in the flocculation structure, to achieve the purpose of water reduction. After the addition of water reducing agent, not only can improve the workability of new mixed concrete, but also because the water-cement ratio of concrete has decreased significantly, the internal pore volume of cement stone is significantly reduced, the cement stone is more dense, and the compressive strength of concrete is significantly increased. The addition of water reducing agent also has an effect on the hydration rate and setting time of cement. All of these properties are important for practical purposes. However, the water reducing agent can effectively destroy the flocculation structure of cement slurry to release the internal free water, but also weaken the interaction between cement particles and water.

Naphthalene series superplasticizer is made of sulfonation, hydrolysis and condensation of industrial naphthalene. Chemical name naphthalene sulfonate formaldehyde condensates, it has a strong dispersion of cement particles. Effectively improve the concrete compactness, enhance the impermeability, at the same time can reduce the water binder ratio, greatly improve the early and late strength of concrete. For the preparation of flow concrete, the cast-in-place concrete and prefabricated components with early strength and high strength requirements have a good use effect, which can comprehensively improve and improve various properties of concrete.

Scope of application

1, admixture factory preparation of various anionic compound concrete admixture.

2, high strength, large volume, large mobility and other kinds of concrete.

Matters needing attention

1. Recommended dosage: 1.2-2.0% of the total amount of cementing material.

2, mixing method: this product and water mixed into concrete mixing use; If the concrete after adding water to add this agent, the effect is better; For other requirements, please follow the relevant provisions of GB50119-2003 Technical Specifications for Application of Concrete Admixtures.

3. Precautions

(1) Compatibility test of concrete mixture should be carried out before use or when combined with other admixtures;

⑵ Attention should be paid to the accuracy of measurement and the influence of temperature on the early concrete performance in construction.

(3) Concrete compatibility test should be carried out in advance when cement varieties change or concrete raw materials fluctuate greatly.

(4) Strengthen the early curing of concrete, this product is forbidden to eat.

Packaging and storage

1. Powder products are made of chemical fiber woven bags, lined with plastic film bags, each bag net weight (40±0.2kg) or (25±0.2kg) or (750±0.2kg), can also be customized according to customer requirements.

2. Powder products should be stored in dry and ventilated special warehouse, products such as damp caking can be crushed or dissolved into water agent use does not affect the actual effect.

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