Abstract
The study focused on the investigation of the influence of α‐phase nano Al2O3 (NA) and M‐sand as a fine aggregate on the partial replacement of cement by micro rice husk ash (MRHA) to enhance the mechanical properties and durability of mortar and achieve an environmentally sustainable material. MRHA was added to the M‐sand cement mortar (by partial replacement of cement) at varying concentrations of 0%, 5%, 10%, 15%, and 20% by weight of cement; and NA was added at the rate of 0%, 0.5%, 1%, 1.5%, and 2% by weight of cement. The results showed that the partial replacement of cement by MRHA (10%) improves the comprehensive and tensile strength by 7% and 6.9%, respectively, compared to the control. Moreover, the incorporation of NA in cement increased the comprehensive and tensile strengths by 15.5% and 41%, respectively. The optimal increment in the combination of MRHA and NA (MN) in the partial replacement of cement resulted in a 26.4% comprehensive strength and a 48.72% tensile strength compared to the control. The flowability of M‐sand mortar containing MRHA and NA was observed to vary depending on the degree of dosage and the admixture. Our study concludes that the partial replacement of cement by the admixtures MRHA (10%) and NA (1%) in combination improved the strength and reduced water absorption when compared to the individual effects and control, suggesting the application of MRHA and NA in concrete technology.
Highlights
IntroductionRecent studies point to the use of agricultural byproducts as partial replacements, which would improve the economy and agricultural waste management [9]
Recent studies point to the use of agricultural byproducts as partial replacements, which would improve the economy and agricultural waste management [9]. e well-organized burnt husk chemical composition has more than 90% amorphous silica [10]. erefore, various researchers have investigated the grinding techniques and microstructure of rice husk ash [11, 12]. e ashes from different rice straw particles have a high amount of SiO2 with K2O and CaO [13]
Even though some research has studied the effects of micro rice husk ash (MRHA) and NA on cement mortar individually, only limited studies have explored the combination of MRHA and NA in enhancing the mechanical property, durability, and flowability. erefore, this study focused on the mechanical properties of M-sand cement mortar with different percentage partial replacement combinations of microlevel MRHA and nano Al2O3
Summary
Recent studies point to the use of agricultural byproducts as partial replacements, which would improve the economy and agricultural waste management [9]. E partial replacement of cement by rice strew ash has improved the compressive strength and reduced the permeability [14], making MRHA, an important alternative in cement replacement. E addition of α-phase nanoalumina improves the mechanical property of M-sand cement mortar [21]. Even though some research has studied the effects of MRHA and NA on cement mortar individually, only limited studies have explored the combination of MRHA and NA in enhancing the mechanical property, durability, and flowability. Erefore, this study focused on the mechanical properties of M-sand cement mortar with different percentage partial replacement combinations of microlevel MRHA and nano Al2O3 Even though some research has studied the effects of MRHA and NA on cement mortar individually, only limited studies have explored the combination of MRHA and NA in enhancing the mechanical property, durability, and flowability. erefore, this study focused on the mechanical properties of M-sand cement mortar with different percentage partial replacement combinations of microlevel MRHA and nano Al2O3
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