Abstract
Due to growing consumption of Portland cement and high levels of CO2 emissions during its production process, this study analyzed the employment of Rice Husk Silica (RHS) as eco-friendly material and its influence on microstructural formation, flexural properties and durability of magnesium oxychloride fiber cement (MOFC). In this way, fiber-cement flat sheets with different MgO/MgCl2 and MgO/SiO2 molar ratios were made by similar Hatschek process. The effects of RHS on magnesium oxychloride cement (MOC) were analyzed by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). The mechanical properties of MOFC were analyzed by flexural tests at 28 days old and after aging by 56 days in warm water. Fractured and polished surfaces were analyzed by secondary and back-scattered electron imaging and energy dispersive X-ray spectroscopy. Evaluation of these analyses provided the microstructural informations that were related to mechanical performance obtained from flexural tests. Results indicate that RHS increase the modulus of rupture and toughness of MOFC by filler effect and M-S-H formation improving the durability of these composites.
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