segregation and slump loss with time and other shortcomings. We find that, by (1) to extend the condensation time (2) adding acid modified S two ways to reduce the slump loss at the same time, can significantly reduce bleeding; and analysis found that adding 11% of modified S carboxyl content of the finished product, yield increased after acid, sulfonated increased by 10%. Naphthalene superplasticizer have raw cheap, simple synthesis process and low cost advantages. However, the disadvantage of sodium naphthalene sulfonate formaldehyde is also well known, such as bleeding, segregation, slump when big loss, poor adaptability to different cement. Years of study at home and abroad
to improve its shortcomings [1-3] a lot, but most of the time focused on improving the slump loss. Focus describes the condition of the characteristics of superplasticizer, research and development. Some issues to be raised further study and research trends sodium naphthalene sulfonate formaldehyde. Ultra-fine mineral admixture is inorganic non-metallic materials.
Superplasticizer is currently the most widely used research and a concrete admixtures, concrete admixtures has become other than cement, sand, stone fifth part of [1]. One is to improve the concrete mixing water reducing admixtures rheological properties of water reducer in concrete slump is basically the same and does not affect sodium naphthalene sulfonate formaldehyde the workability conditions, with less water, raising the temperature effect of admixtures. Synthesized by molecular design various functional groups containing carboxylic acid copolymer (CoPoCa-300) admixtures, and naphthalene sulfonic acid formaldehyde condensates get a new series of complex composite superplasticizer
CoPoCa-NSF series. Superplasticizer compound reduces the amount of sodium naphthalene sulfonate formaldehyde and produces ultra-additive effect of
the composite water reducer has a high water reduction (24% to 28%) and good slump retention, can significantly improve the strength of the concrete 40% to 50%. Currently widely used in domestic superplasticizer mainly naphthalene sulfonic acid formaldehyde condensate (referred naphthalene superplasticizer), amino acid salt series polycarboxylate polymers and superplasticizer [1].
Polycarboxylate superplasticizer series is widely recognized as a new, green high-performance water-reducing agent [2-4], the biggest advantage of this type of water-reducing agent is water reducing rate.
Concrete slump loss with time small paper describes the structure of
the type commonly used sodium naphthalene sulfonate formaldehyde, performance characteristics and application of research status at home and abroad; analyzes the development and application of naphthalene superplasticizer problems. Process for the sodium naphthalene sulphonate formaldehyde. Single-factor test, based on a systematic study of the molar ratio of the monomers, the various stages of reaction time, reaction temperature, acidity and other process parameters and material for naphthalene superplasticizer performance, determine the optimal synthesis of process parameters.
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