High strength cement pastes

XPS characterization of polymer–monocalcium aluminate interface

“…The high-shear mixing intensity could be well controlled by gap and speed of two rollers [11]. At the beginning, researchers supposed that the highshear mixing is used only to eliminate macrodefects (large pores and air voids) from the paste, but further development confirmed, that the high-shear mixing also induces chemical interactions between the polymer and the inorganic cement [12]. It was also recognized that much of the mechanical strength of these materials is due to the mechanically induced chemical changes [9].…”

Microscopic, physical and mechanical analysis of polypropylene fiber reinforced concrete

“…However, some other polymers like polyacrylamide (PAM) may modify concrete properties through chemical reaction. It was reported that PAM reacts with multivalent ions such as Ca 2+ and A1 3+ of cement hydrates to reduce the amount of CH [14,[28][29][30][31][32], and the formed ionic compound gels wrap on cement hydrates to reduce the crystallization and orientation of CH [14].…”

Viscoelastic behaviour of macro-defect-free cement

“…The structure of MDF cement has been under active study since its development a decade ago [7][8][9][10][11]. It is generally believed that the cement particles (calcium aluminates) are bonded together by PVA that has been altered or cross-linked by ions released from the cement [7,8]. In addition, the unhydrated cement particles are surrounded by a thin "interphase" layer distinct from the rest of the PVA that is composed of small hydrate crystals embedded in the PVA [11].…”