The Influence of Biomass Power Plant Ash on the Mechanical Properties of Recycled Aggregate Concrete: A Review

Abstract

With the increasing installed capacity of biomass power generation in China and the evolution of urbanization, the disposal of biomass power plant ash and construction waste, mainly concrete, has become extremely urgent. Through biomineralization, biomass power plant ash theoretically contains highly active volcanic ash active substances such as silica, which has the potential to be developed as a new type of auxiliary cementitious material for cement concrete. However, the preparation conditions of biomass power plant ash differ greatly from the optimal preparation conditions in the laboratory, and the physical and chemical properties of biomass power plant ash are not stable. Therefore, it is challenging to apply biomass power plant ash as an auxiliary cementitious material in concrete systems. Secondly, the building materials industry has high energy consumption and carbon emissions. The use of recycled aggregates and auxiliary cementitious materials to replace cement is a key measure to address global climate change. This article provides comments on the physical and chemical properties of biomass ash and its impact on the mechanical properties of concrete, the mechanical properties of recycled aggregate concrete, and the influence of auxiliary cementitious materials on the mechanical properties of recycled aggregate concrete. The aim is to inspire research on the mechanical properties of biomass power plant ash recycled aggregate concrete.