Effects of an Inorganic Acid Based Alkali-Free Accelerator on the Setting and the Compressive Strength Development of a Hydrating Clinker Containing Different Setting Regulators

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Title: Effects of an Inorganic Acid Based Alkali-Free Accelerator on the Setting and the Compressive Strength Development of a Hydrating Clinker Containing Different Setting Regulators

Author(s): C. Maltese, C. Pistolesi, A. Bravo, F. Cella, T. Cerulli, and D. Salvioni

Publication: Special Publication

Volume: 239

Issue:

Appears on pages(s): 487-506

Keywords: alkali-free accelerators; compressive strength; setting regulator; setting time

Date: 10/1/2006

Abstract:
In this paper, the influence of different setting regulators on the performances of an inorganic acid based alkali-free accelerator was analysed. Setting time and compressive strength development were determined on clinker samples added with b-hemihydrate or anhydrite and admixed with the alkalifree accelerator. It was found that the lower is the setting regulator instantaneous dissolution rate, the shorter is the final set and the higher the compressive strength development (therefore the more efficient is the accelerator). In order to understand this phenomenon, physical (hydration temperature profile), chemical (TG and XRD), morphological (ESEM-FEG and specific surface area measurements) analyses were carried out on paste samples added with the accelerator.