In this paper, a new green hybrid bagasse fiber (3% by volume) and steel fiber (0.7% by volume) reinforced cementitious composites with high volume fly ash (fly ash to cement ratio of 1.6) is developed and cured in weather condition up to 10 months. Basic mechanical tests, such as compressive test, Young’s modulus test, flexural test, and uniaxial tensile test and SEM tests were conducted at the age of 28 days, 3 months, 6 months and 10 months, respectively. Through comparison with the mechanical behavior of the composite at the age of 28 days, the long-term effect on the mechanical properties of the composite is evaluated. It is found the mechanical properties of the new composite increases greatly with aging. At the age of 10 months, the composite becomes more compacted and the composite is of excellent mechanical properties making it very promising to be used as commercial building materials.
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