Influence of fly ash and basalt fibers on the properties of recycled
pervious concrete
Abstract
As an environmentally friendly building material, recycled pervious
concrete can not only alleviate the increasingly severe urban flooding
and heat island effect, but also realize the resource utilization of
construction waste. However, the porous nature of recycled pervious
concrete leads to its low strength, and there is an urgent need to
develop recycled pervious concrete with good mechanical and permeability
properties. This paper proposes to mix fly ash and basalt fibers in the
waste brick aggregate pervious concrete, and investigate the effects of
mixing fly ash and basalt fibers on the properties of recycled brick
pervious concrete by comparing the mechanical properties, water
permeability and frost resistance of recycled brick pervious concrete.
The results show that: with the increase of fiber admixture, the
mechanical properties and frost resistance of recycled brick-mixed
permeable concrete are improved, and the water permeability is
decreased; fly ash is more obvious to improve the late strength of
recycled brick-mixed permeable concrete, with the increase of fly ash
admixture, the mechanical properties and frost resistance of recycled
permeable concrete are improved, and the water permeability is
decreased, and the excessive admixture of fly ash will greatly reduce
the water permeability of recycled brick-mixed permeable concrete.
Excessive incorporation of fly ash will greatly reduce the water
permeability of recycled pervious concrete. Under the premise of better
water permeability and mechanical properties, the optimal mix
combination of 10% fly ash and 0.05% basalt fiber was selected on the
basis of 85% recycled concrete aggregate and 15% brick aggregate as
the mixed coarse aggregate.