Revista Mexicana de Ingeniería Química, Vol. 22, No. 3 (2023), Proc2348

Polycarboxylate-based superplasticizer with added silica sub-microspheres for use in Portland cement materials

M.J. Ungsson-Nieblas, E. Rubio-Rosas, R.A. Vargas-Ortíz, A. Bórquez-Mendivil, F.G. Cabrera-Covarrubias, A. Castro-Beltrán, B.A. García-Grajeda, J.L. Almaral-Sánchez



A new polycarboxylate, PCE, based superplasticizer was synthesized with added silica sub-microspheres, Ss (Ss-PCE), from the synthesis of these two components, for use in Portland-cement materials. PCE was synthesized from the copolymerization of methacrylic-acid and poly(ethylene-glycol)-methacrylate. Ss (»200 nm) were synthesized from Stöber-method. Ss-PCE was obtained with the addition of Ss (5% by weight-PCE). Four cement pastes and mortars were prepared. The characteristic bonds of PCE, Ss and Ss-PCE were identified (FT-IR), the average size (HRTEM) and structure (XRD) of Ss were defined. The hydration products of cement pastes (3, 7 and 28 curing days) were identified (XRD). The compressive strength of the mortars was obtained (ASTM-C109/C109M-20). The success of our work was to synthesize PCE and Ss to form Ss-PCE, and to improve the performance of cementitious materials modified with them, this offers the possibility of continuing this research later because both PCE and Ss were synthesized, and it will be possible to delve into its behavior. In addition, was defined that the initial hydration process of C3S in Portland cement slowed down significantly and the compressive strength of the modified mortars was increased (3, 7 and 28 days) due to Ss-PCE.

Keywords: Portland cement, silica sub-microspheres, polycarboxylates, hydration products.



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