Abstract
Coir fiber (CF), an eco-friendly and renewable natural fiber, was introduced into magnesium phosphate cement (MPC) mortar to improve its crack resistance. A total of 21 specimens were employed to investigate the failure pattern, compressive strength, stress–strain curve, and energy absorption of MPC with varying CF lengths (0, 5, 10, 15, 20, 25, and 30 mm) after a curing period of 28 days through a static compressive test. The results demonstrated that compressive strength, elastic modulus, and secant modulus decreased with the increase in CF length. However, energy absorption presented a convex curve, which increased to the maximum value (77.0% relative to the value of the specimen without CF) with a CF length of 20 mm and then declined. A series of modern micro-tests were then carried out to analyze the microstructure and composition of specimens to explain the properties microscopically.
Highlights
Magnesium phosphate cement (MPC), a chemically bonded ceramic [1,2], is a new inorganic cementitious material produced by a neutralization reaction between phosphate and magnesium oxide, and has been widely used in concrete bridge structure reinforcement and road repairment [3,4].its decreased toughness compared to older building materials can result in secondary damage to these reinforced bridges and repaired roads
Atypical compressive test was performed to study the effect of Coir fiber (CF) length on the compressive strength, failure pattern, stress–strain curve, and energy absorption of MPC
When the length of the CF was longer than 10 mm, the failure pattern changed from brittle to ductile
Summary
Magnesium phosphate cement (MPC), a chemically bonded ceramic [1,2], is a new inorganic cementitious material produced by a neutralization reaction between phosphate and magnesium oxide, and has been widely used in concrete bridge structure reinforcement and road repairment [3,4]. Its decreased toughness compared to older building materials can result in secondary damage to these reinforced bridges and repaired roads To overcome this problem, many studies were conducted on incorporating various synthetic fibers, such as steel fiber, glass fiber, and basalt fiber into MPC to improve its toughness. Feng et al [5] found that the incorporation of micro steel fiber can significantly improve the compressive strength and flexural toughness of MPC composites. Materials 2020, 13, 3194 natural fibers [11,12,13], showing a high potential to effectively improve the toughness and mechanical properties of cement composites. Li et al [15] found that cementitious composites reinforced by CF have better flexural strength, higher energy absorption, and increased ductility. X-ray detector (EDX), were adopted to analyze the microstructure and composition of specimens to explain the properties microscopically
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