Compatibility of polycarboxylate superplasticizer with other admixtures.
Customer Use of Superplasticizer in Concrete
Customer use of superplasticizer in concrete,lubricants are chemical compounds that make it possible to produce concrete with approximately 15% less water. Superlubricants allow water content to be reduced by 30% or more. These additives are used at the level of a few percent by weight. Lubricants and super-lubricants delay the curing of concrete. In general, superlubricants can be classified into several types: pure lignosulfonates, carboxylate synthetic polymers, sulfone synthetic polymers, and synthetic polymers with mixed performance cementitious materials.
Superplasticizers are used where a suspension of well-dispersed particles is required to improve the flow (rheology) properties of the suspensions, such as in concrete applications. Use of superplasticizer in concrete. Their addition to concrete or mortar allows the reduction of the water-cement ratio without negatively affecting the workability of the mixture, and allows the production of self-consolidating concrete and high-performance concrete.
They greatly improve the performance of freshly hardened dough. The strength of concrete increases by decreasing the water-cement ratio. Adding SP to the truck during transport is a fairly modern development in the industry. Additives added in transit through automated slump management systems, such as Verifi, allow concrete producers to maintain slump until discharge without reducing concrete quality.
Radial softeners are lignosulfonates as their sodium salts. Super lubricants are synthetic polymers. Compounds used as superlubricants include naphthalene formaldehyde sulfone condensate, melamine formaldehyde sulfone condensate, acetone formaldehyde condensate, and polycarboxylate ethers. Cross-linked melamine or naphthalene sulfonates, called PMS (polymelamine sulfonate) and PNS (polynaphthalene sulfonate), respectively, are explicators.
They are prepared by crosslinking sulfonated monomers using formaldehyde or by sulfonating the corresponding network polymers. Ideal structure of naphthalene sulfonate/formaldehyde polymer used as superlubricant.
Displacement of polycarboxylate on a multiphase suspension system. Polymers that act as softeners show the properties of surfactants. They are often ionomers. They act as dispersants to minimize the separation of particles (sand, coarse and fine sand). The negatively charged polymer backbone is adsorbed on the positively charged colloidal particles. However, engineers do not fully understand their working mechanisms, which in certain cases leads to the incompatibility of cement and superplasticizer.
At the same time, polycarboxylate water reducer also has problems:
- Inadequate preservation of slump in high temperature environment.
Strong temperature sensitivity, the same type of polycarboxylate superlubricant is made in different seasons, and the concrete slump preservation properties are completely different.
There are few practical products, and it is difficult to meet the requirements of extremely high and very long concrete pumping, negative temperature construction, the preparation of concrete with super early strength and high concrete durability.
High viscosity, in the preparation of concrete with high additives and low water-to-binder ratio, the viscosity of concrete is high, which is not suitable for construction.
Extreme sensitivity to the content of mud and sand aggregates.
It also has poor compatibility with machine sand and its dosage is sensitive to affect the construction.
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Polycarboxylic acid high-efficiency water reducing agent is characterized by low dosage and high water reducing rate.