Influence Of Mortar Adhesive To Recycled Aggregate On Strength Of Concrete And Research Of Lime-fly Ash Stabilized Recycle Aggregate

Disused concrete is the main part of construction wastes. The situation of shortage in aggregates more expenses for dealing, serious environmental pollution and social problem will be released if disused concrete is reused for recycled aggregates. The research about reused concrete is late relatively in land. There is short of perfect technology law and criteria. So the research is only testing and cautious.This paper designs a reusing technology method to recycle disused concrete, concludes and generalizes systematically the basic performances of recycled aggregates, and presents parameters of affecting them. The research indicates that a lot of performances of recycled aggregates are different from ones of natural aggregates. Using recycled aggregates should be carious, and we must master all of the performances.By means of the finite element software of ANSYS, aggregates are taken as spheres located in mortar at random. Using randomness theory, numerical model is generated. This paper analyses the influence of strength and thickness of mortar adhesive to recycled aggregates on strength of recycled concrete. The result of simulation is that the adhesive mortar which has lower strength larger deformation and easy failure is the main contributory factor, which direct controls the reflection acted by load through the medium of new and old ITZ.Finally, with theory method the engineering value of lime-fly ash stabilized aggregate base made by recycled aggregates is studied. Maximum dry density, optimal water-containing quantity unconfined compression strength split tensile strength and resilient modulus are determined experimentally. The result shows that lime-fly ash stabilized aggregate base is feasible and it can satisfies the demand of road engineering.