Performance of Novel Naphthalene-Based Copolymer as Superplasticizer for Concrete
M. Page, A. Moldovan, and N. Spiratos
Appears on pages(s):
adsorption; concrete; superplasticizer
A family of new polymeric dispersants has been synthesised by copolymerisation of 2-naphthalene sulfonic acid and other functionalised aromatic monomers. When used as a HRWR in concrete, some of these new copolymers exhibit properties superior to those of poly-naphthalene sulfonate (PNS) superplasticizers, with respect to both the concrete workability (slump values) and the slump retention behaviour. A comprehensive evaluation of these new superplasticizers is currently underway, and results obtained for one of these products, (referred here as PNS-copolymer) are reported here with several cementitious systems. The data presented qualify the new copolymers with respect to intrinsic properties of the polymers (charge density, molecular weight distribution), polymer adsorption on hydrating cement particles, influence on cement hydration and setting, rheological properties of fresh cement pastes and concrete as function of time, and concrete compressive strengths. The results are compared with data pertaining to a PNS super-plasticizer of comparable average molecular weight.