With the rapid development of economic society,people's living standards are getting better and better,and various industries are flourishing.Concrete technology is an important technology in the construction process of projects,and its application in road and bridge engineering has significant value in improving engineering quality.Therefore,this paper starts from studying the characteristics of concrete construction technology,analyzes its appli-cation in concrete,and combines with actual construction to analyze its control difficulties,aiming to promote its ef-fective application and effectively improve the quality of road and bridge engineering.

Lithium-ion batteries (LiBs) have excellent electrical properties and are widely used in many application domains. With the remarkable development of the LiBs industry, the number of spent LiBs has dramatically increased. To reduce environmental pollution and resource depletion, several technologies for recycling and regenerating LiBs have been developed, especially for valuable metals, such as lithium, manganese, cobalt, nickel, and copper. The reuse of LiB materials via regeneration is one of the cleanest and cheapest approaches. This study first analyses the structure and composition of a typical LiBs and classifies the regeneration methods based on their structure. Owing to the varied measurement conditions of different regeneration methods, which cannot be compared directly, a normalised transformation method for LiBs is proposed to calculate and compare the results under different discharge current rates (Crates) and cycles. Furthermore, the degradation mechanism of LiB materials is analysed. Finally, novel green regeneration technologies are summarised. This review aims to develop a deep understanding of regeneration methods through comparison and analysis and identify the most promising regeneration methods. The analysis shows that designing a fully recyclable and regenerative LiB is the most promising method to solve the problem of spent LiBs.

MOF 235 was fabricated by a facile microwave-assisted method. It showed excellent visible-light photocatalytic activity in the presence of H2O2. It displays a high chemical stability for repeated RhB degradation reactions.

A new potassium lutetium borate, K3LuB6O12, was synthesized by a flux method and the crystal structure was determined by the single crystal X-ray diffraction. It crystallizes in non-centrosymmetric space group R32 and features a three-dimensional framework that is composed of B5O10, KO6, KO8, LuO6 and (K|Lu)O6 groups. Band structure calculations by the density functional theory method indicate that K3LuB6O12 has direct bond gap of about 2.84 eV. The optical absorption can be mainly ascribed to the charge transitions from the O-2p states to the Lu-6s and Lu-5d states. Moreover, Eu-doped phosphor K3Lu0.95Eu0.05B6O12 was synthesized by a solid-state reaction and its photoluminescence properties were studied. Under near-UV excitation (393 nm), K3Lu0.95Eu0.05B6O12 exhibits an intense red emission centered at around 611 nm with the CIE coordinate of (0.641, 0.357), which can be assigned to the electric dipole 5D0 → 7F2 transition of Eu3+ ions. We think that K3Lu0.95Eu0.05B6O12 may be used as a good red phosphor pumped by near UV light LED chips.