New Superplasticizers Based on Modified melamine Polymer

摘要

Admixtures based on sulfonate melamine formaldehyde condensate polymer (SM) have been available commercially for more than three decades. These products are widely used by the precast concrete industry, but ith some limitations on slump retention and early strength. To improve these properties, synthesis of a modified sulfonate melamine formaldehyde condensate polymer (MSM)was performed. In this paper its physical and chemical characteristics are reported. Dispersibility and adsorption tests, using cement pastes, were carried out to compare the superplasticizing effect of hte new MSM polymer against the SM polymer. Concrete mixtures were also made to evalaute the performances of this MSM polymer in comparison with the other types of superplasticizers such as SM and beta -naphthalene sulfonate formaldehyde condensate (SN).