A Novel Type of PCE Possessing Silyl Functionalities


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Title: A Novel Type of PCE Possessing Silyl Functionalities

Author(s): Julia Witt and Johann Plank

Publication: Special Publication

Volume: 288


Appears on pages(s): 1-14

Keywords: polycarboxylate, cement, silane, concrete

Date: 9/14/2012

A series of silylated PCE polymers was prepared by aqueous free radical copo¬lymerization using methacrylic acid, ω-methoxy poly(ethylene glycol) methacrylate ester and N-maleic γ-aminopropyl triethoxy silane (MAPS). The resulting copolymers possess silanol groups from alkaline hydrolysis of the triethoxy silane functionality in cement pore solution and thus can chemically interact with C-S-H phases. It was found that incorpora¬tion of MAPS significantly enhances the dispersing performance of ready mixed type PCEs possessing high grafting density while no improvement was observed for low grafted PCEs common in precast concrete. Adsorption tests revealed that MAPS increases adsorption of highly grafted PCEs, while adsorption of pre-cast type PCEs remains unaffected or even decreases.