Abstract
Lamellar inorganic fillers have been used to improve the performance of polymer composites. In this paper, five kinds of lamellar inorganic fillers, including montmorillonite (MMT), mica, talc, glass flake (GF) and lamellar double hydroxide (LDH), were selected to modify epoxy emulsion cement mortar (EECM). The research evaluated the effects of the structure characteristics of lamellar fillers on the mechanical properties, water absorption and chloride ion permeability resistance of EECM, with comparison to granular ground calcium carbonate (GCC). Results indicated that lamellar fillers had no obvious superiority than GCC in the mechanical strength of EECM, even MMT caused the decline of the mechanical strength. However, lamellar fillers had improved the chloride ion permeability resistance of EECM compared with GCC, and they had the similar effect on reducing of water absorption except MMT. Although the low aspect ratio (AR) of the lamellar fillers benefited the increase of the strength and water resistance of EECM, the lamellar fillers with higher AR could improve the chloride ion permeability resistance of EECM more efficiently.
Highlights
As a traditional building repair material, cement mortar still occupies an important position in the architectural field in the 21st century (Biernacki et al 2017)
The size of ground calcium carbonate (GCC) is between the sand and cement and it has a significant “bridge effect” in epoxy emulsion cement mortar (EECM), which reduces the brittle failure of EECM
It may be the reason that the strong water absorption of MMT (Yu et al 2013), which causes the decline in the fluidity of EECM, as a result the cement hydration process is hindered and can not form a complete organic–inorganic crosslinking structure with epoxy resin
Summary
As a traditional building repair material, cement mortar still occupies an important position in the architectural field in the 21st century (Biernacki et al 2017). Ordinary Portland cement mortar has porous structure (Chen et al 2017), poor toughness and durability (Zhang et al 2017) Some ions, such as C l− and SO42−, penetrate cement mortar and led to rusting of the reinforced concrete structures (Alhozaimy et al 2016; Conciatori et al 2010; Abdalkader et al 2017), the resistance to chloride ion permeability as well as the mechanical properties of cement mortar in coastal engineering is required to improve. Studies indicated that the mechanical properties and resistance to chloride permeability of cement mortar could be improved by polymer materials (Wang et al 2005; Zhong 2003), especially epoxy resin with excellent corrosion resistance, bonding and mechanical strength (Zhang and Yan 2017).
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