光催化混凝土的性能(英文)

Properties of Photocatalytic Concrete

在水泥中掺入TiO2制备在普通日光下即可发生光催化反应的光催化水泥.光催化水泥应用于混凝土结构时,可在混凝土表面产生光生电子,分解空气中的污染物,如NOx.TiO2可以作为自然氧化反应的催化剂负载于混凝土表面,并加快NOx与SOx的分解速率.根据现有文献报道,光催化混凝土或涂层在应用时对于NOx污染物的分解效率波动范围较大,为20％～80％.造成如此大幅波动的原因与污染物监测技术有关,同时也与环境条件多样性有关,如光照强度、相对湿度、温度、风速以及光照方向都会影响NOx的分解.本项目对比研究了使用普通水泥和光催化水泥所配制混凝土的性质,结果表明,与普通水泥相比,光催化水泥更难引入气孔,但力学性能与普通水泥相当.光催化混凝土的工作性及耐久性仍需进一步研究.

TiO2 can be integrated in the cement manufacturing process to produce photocatalytic cement.Normal daylight can be used for the photocatalytic reaction.When this type of cement is used in concrete structures,a charge is created on the surface that reacts with external substances to decompose air pollutants such as NOx.TiO2 can be integrated into a concrete surface to act as an accelerator for the natural oxidation process.It promotes a faster decomposition of NOx and SOx.Based on the literature review,a wide range （20％-80％ reductions） of pollution abatement efficiencies for NOx were observed when photocatalytic concrete or coatings were applied to infrastructure in the field.An explanation for the large range of measured NOx reductions is related to pollution monitoring techniques as well as the high variations in environmental conditions such as light intensity,relative humidity,temperature,wind speed and direction.This paper entailed an experimental study that compares the concrete properties of general use cement with concrete made with photocatalytic cement.The results reveal that photocatalytic cement concrete is more difficult to entrain air voids in and that it can achieve comparable mechanical properties to general use concrete.Further research is required to examine the transport and durability properties.