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Photoactive nanomaterials have been receiving increasing attention due to their potential application in the light-driven degradation of water and gas-phase pollutants. However, to exploit the great potential of photoactive materials and access their properties requires fine-tuning of their size/shape-dependent chemical–physical properties, and on the ability to integrate them in photoreactors or to deposit them onto large surfaces. Therefore, the synthetic approach as well as post-synthesis manipulation could strongly affect the final photocatalytic properties of the nanomaterial. The aim of the present Special Issue is to report on the most recent progress towards the application of photoactive nanomaterials and nanomaterial-based coatings in pollutant degradation, paying particular attention to cases close to real application: scalable synthetic approaches to nanocatalysts, preparation of nanocatalyst-based coatings, degradation of real pollutants and bacterial inactivation, and application in building materials.

toxicity --- polar herbicide --- composite nanorods --- heterojunction --- degradation --- nanocomposites --- nanoparticles --- polyester --- TiO2 nanotube --- environmental remediation --- building materials --- hydroxyapatite --- VOCs --- reactive green 12 --- Pt loaded TiO2 --- nanomaterials --- expansion --- photocatalytic activity --- CuxO/TiO2 --- water remediation --- antimicrobial properties --- sputtering --- diclofenac --- mesoporous --- TiO2 --- advanced oxidation processes --- mortar --- disinfection --- HiPIMS --- microcracks --- Cu2O --- sulfate attack --- NOx --- photocatalysis --- blast furnace slag --- paraquat --- recalcitrant pollutants --- shell thickness --- water treatments --- visible light LEDs --- cement --- deterioration --- transformation products --- gas-phase pollutants --- titanium dioxide --- photoelectrocatalysis --- Z-scheme

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The innovations in construction materials that have been made due to the development of different varieties of concrete have led to innovations in structural applications and design. This Special Issue mainly focuses on state-of-the-art research progress in high-performance concrete, including the effect and characteristics of fibers on the properties of high-performance concrete, the CO2 curing efficiency of high-performance cement composites, and the effect of nano materials when used in ultra-high-performance concrete. This Special Issue also contains two comprehensive review articles covering the following topics: the role of supplementary cementitious materials in ultra-high-performance concrete and recent progress in nanomaterials in cement-based materials. Readers working towards conducting research on innovative construction materials will be exposed to findings related to this topic in this Special Issue.

Technology: general issues --- History of engineering & technology --- ultrahigh-performance concrete --- nanosilica --- dynamic light scattering --- zeta potential --- pore solution --- alkali-activator --- GGBFS --- Na2O content --- Ms (SiO2/Na2O) --- workability --- setting time --- steel fiber --- fiber content --- aspect ratio --- toughness index --- high-strength concrete --- fibers --- smart materials --- fiber/matrix bond --- physical properties --- heat treatment --- alkali-activated material --- calcium sulfoaluminate-based expansive additive --- concrete shrinkage --- modulus of elasticity --- shrinkage stress --- SIFRCC --- fiber volume fraction --- direct tensile strength --- energy absorption capacity --- direct tensile test --- carbon nanotubes --- cement-based materials --- concrete infrastructure --- graphene --- graphene oxide --- mechanical strength --- nanomaterials --- nano-Al2O3 --- nano-Fe2O3 --- nano-SiO2 --- nano-TiO2 --- smart infrastructure --- slurry-infiltrated fiber-reinforced cementitious composite --- high-performance fiber-reinforced cementitious composite --- compressive stress --- stress-strain relationship --- filling slurry matrix --- bio-slime --- sulfate attack --- chloride attack --- service life --- multi-layer diffusion --- repair --- concrete --- dynamic compression --- Split Hopkinson Pressure Bars (SPHB) --- brittle materials --- simulation --- calcined zeolite sand --- ultra-high-performance concrete --- pre-wetted --- autogenous shrinkage --- internal curing --- reactive powder concrete --- strength --- basalt fibers --- abrasion --- porosity --- microscopic image processing --- X-ray CT analysis --- porous cementitious materials --- 3D tomographic image --- CO2 curing --- size effect --- colloidal silica --- cement-based material --- casting method --- ultra-high performance fiber-reinforced concrete --- densified silica fume --- agglomeration --- pozzolanic reaction --- densification --- alternative alkali-activated material --- ground granulated blast-furnace slag --- strength development --- CSA expansive additive --- ultrasonic pulse velocity --- temperature --- high performance concrete (HPC) --- C-shape magnetic probe test --- fibre orientation angle --- flexural test --- attenuation factor --- ultra-high-performance steel fiber-reinforced concrete --- multiscale finite element modeling --- multi-point constraint --- multi-scale interface connection --- concrete damage plasticity model --- ABAQUS --- ultra high-performance concrete (UHPC) --- supplementary cementitious materials (SCMs) --- sustainability --- compressive strength --- flowability --- shrinkage --- railway sleeper --- static bending test --- numerical simulation --- structural performance --- high performance fiber reinforced concrete (HPFRC) --- polypropylene fiber (PP) --- polyvinyl alcohol fiber (PVA) --- residual flexural strength --- splitting tensile strength