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Investigation into the Solubility and Stability of PCE Superplasticizers in Pore Solutions of Alkali-Activated Slag

SSRN, ISSN: 1556-5068
2024
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Article Description

Stability of HPEG, EPEG and MPEG PCE superplasticizers of varied molecular structures in NaOH- and NaSiO-activated slag was investigated. Relative to their solubility, the order MPEG>HPEG>EPEG was found in both activator solutions via the “cloud point” method. GPC spectra confirmed that at RT all PCEs don´t decompose in activator solutions, independent of activator concentration and exposure time (1h/1d). However, at 50°C MPEG PCE hydrolyzes. “Mini-slump” tests in NaOH-activated AAS confirmed superior dispersing effectiveness of HPEG PCE, and least effect from MPEG PCE. No PCE could disperse NaSiO-activated slag. Adsorption tests revealed non-Langmuir behavior in NaOH and almost no adsorption in NaSiO pastes. DLS measurements revealed steric sizes of <10 nm for the PCEs in 1-3 M NaOH and 0.25M NaSiO, and agglomerates (Rh > 1 μm) at higher NaSiO concentration. Apparently, PCE effectiveness in AAS is controlled by a combination of solubility, adsorption and molecular conformation/aggregation in AAS pore solutions.

Bibliographic Details

Jiaxin Chen; Johann Plank

Elsevier BV

Multidisciplinary; Ground granulated blast furnace slag (GGBFS); Alkali-activated slag (AAS); Polycarboxylate (PCE); superplasticizer; solubility

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