Abstract
ABSTRACT: The principal phase of hardened Portland cement pastes is calcium silicate hydrate (C-S-H), which influences the physical and mechanical properties of construction materials. In this work, calcium silicate hydrate (C-S-H) was synthesized, with the addition of poly-methacrylic acid with sodium (PMA), for the development of C-S-H/ polymer nanocomposites. Among the polymers available, PMA is indicated in the literature as one of those viable for producing C-S-H/polymer complexes. However, no consensus exists regarding the type of interaction this produces. The resulting compounds were characterized by XRD, FT-IR, TGA, carbon content (CHN), TEM, SEM and elastic modulus and hardness were measured by instrumented indentation. A significant change was verified in the nanomechanical properties of C-S-H with PMA, resulting in reduction in the elastic modulus and hardness. The set of results presented do not confirm the intercalation of PMA in the interlayer space of C-S-H, but presented evidence of the potential for intercalation, since changes in the microstructure clearly occurred.
Highlights
It is well known that calcium silicate hydrate (C-S-H), the main product from Portland cement hydration, has a significant influence on most physical and mechanical properties of cement-based materials
This study evaluated the chemical and micro-nanomechanical properties of the synthesis of C-S-H modified with poly-methacrylic acid with sodium (PMA) polymer, in order to contribute to the development of C-S-H/polymer nanocomposites
There are two bands for C-S-H/PMA at 957 and 910 cm-1, and essentially one that refers to the Q2 bond, at 910 cm-1, for C-S-H, which indicates an increase in the Q2/Q1 ratio and greater chain lengths and polymerization in the dreierketten region, with the addition of PMA
Summary
It is well known that calcium silicate hydrate (C-S-H), the main product from Portland cement hydration, has a significant influence on most physical and mechanical properties of cement-based materials. C-S-H is considered a lamellar, crystalline semi-continuum and an inherently complex material, in relation to its “bond” nature forces - ionocovalent forces between individual C-S-H layers or C-S-H layer stacks, separated by strongly localized calcium ions and water molecules. This study evaluated the chemical and micro-nanomechanical properties of the synthesis of C-S-H modified with PMA polymer, in order to contribute to the development of C-S-H/polymer nanocomposites
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