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Abstract
Photocatalytic concrete technology has attracted much attention in the field of sustainable construction and infrastructure by photocatalytic decomposition of harmful air and water pollutants. Various modified photocatalytic concretes have recently emerged to address the unsatisfactory photocatalytic performance of traditional photocatalytic concrete, and the hydration and carbonation of these photocatalytic concretes have also been explored. This article reviews the mainstream synthesis strategies of photocatalytic concrete, and further analyzes the photocatalytic performance of various types of photocatalytic concrete based on the different photocatalysts and preparation methods. The influence mechanisms of concrete hydration and carbonation was discussed, and the internal relationship between the hydration, carbonation and photocatalytic performance was established from the perspectives of shielding effect, gel mass transfer, band energy and chemical balance. Besides, in view of the characteristics of the photocatalyst and the influence of hydration and carbonation on pore structure, the mechanical properties of various photocatalytic concrete were further evaluated. Because of current challenges and future developments, the possibility of an in-depth dissection of photocatalytic concrete systems to further enhance their practical applications is prospected.
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