Effect of Fly Ash Quality and Dosage on the Comprehensive Performance of Fiber Reinforced Concrete for Highway Engineering
In order to improve the comprehensive performance of fiber reinforced concrete for highway engineering and reduce the construction cost,the effects of different quality and amount of fly ash on the comprehensive performance of fiber reinforced concrete were studied by testing the working performance,mechanical properties,chloride penetration resistance and frost resistance of the concrete mix.The results show that the working performance of fiber reinforced concrete is improved by adding 5％～20％fly ash of different quality.With the increase of fly ash content,the compressive strength of fiber reinforced concrete first increases and then decreases,the electric flux gradually decreases,the mass loss after 200 freeze-thaw cycles first decreases and then increases,and the relative dynamic elastic modulus first increases and then decreases.The addition of fly ash can effectively improve the mechanical properties,chloride ion penetration resistance and freeze resistance of fiber reinforced concrete.When the fly ash content is 15％,the mechanical properties and freeze resistance of fiber reinforced concrete reach the best.The improvement effect of Grade Ⅰ fly ash on the comprehensive performance of fiber reinforced concrete is slightly better than that of grade Ⅱ fly ash,but considering the factors such as construction quality and cost,we can consider using grade Ⅱ fly ash instead of grade Ⅰ fly ash.
NETL
NSTL
万方数据
维普
