Abstract: The present invention provides a graphene oxide-tetraethyl orthosilicate (TEOS)/silane composite gel material, and a preparation method and use thereof, and belongs to the technical field of building surface coating. The graphene oxide-TEOS/silane composite gel material provided by the present invention includes the following components: 5-45 parts by weight of graphene oxide dispersion, 30-90 parts by weight of TEOS, 30-80 parts by weight of silane, 1-5 parts by weight of emulsifier, and 1-5 parts by weight of dispersant; the graphene oxide dispersion has a concentration of 0.5-5%. The graphene oxide-TEOS/silane composite gel material provided by the invention can form a hydrophobic anticorrosive coating after coating the surface of a cement-based material, and has excellent water resistance and corrosion resistance.

Abstract: The present invention provides a graphene oxide-tetraethyl orthosilicate (TEOS)/silane composite gel material, and a preparation method and use thereof, and belongs to the technical field of building surface coating. The graphene oxide-TEOS/silane composite gel material provided by the present invention includes the following components: 5-45 parts by weight of graphene oxide dispersion, 30-90 parts by weight of TEOS, 30-80 parts by weight of silane, 1-5 parts by weight of emulsifier, and 1-5 parts by weight of dispersant; the graphene oxide dispersion has a concentration of 0.5-5%. The graphene oxide-TEOS/silane composite gel material provided by the invention can form a hydrophobic anticorrosive coating after coating the surface of a cement-based material, and has excellent water resistance and corrosion resistance.

Abstract: The disclosure relates to the technical field of building materials, and in particular, to lightweight aggregate ultra-high performance concrete (UHPC) and a preparation method thereof. The lightweight aggregate UHPC provided in the disclosure is prepared from the following components in parts by weight: cement 220-260 parts; silica fume 100-120 parts; expanded perlite powder 120-160 parts; expanded perlite 230-260 parts; polycarboxylate superplasticizer 15-20 parts; steel fiber 76-93 parts; and water 140-160 parts, where a maximum particle size of the expanded perlite powder is 0.075 mm; and a particle size range of the expanded perlite is 0.075-0.6 mm. The lightweight UHPC prepared according to the design of the disclosure has excellent density performance, and can satisfy requirements of concrete components, etc.

Abstract: A superhydrophobic coating is provided and contains organosilane, an inorganic nanomaterial, and an emulsifying agent. A mass proportion of the components is controlled, so that the superhydrophobic coating can form a micro-nano mixed microstructure inside foam concrete. The organosilane first forms dense hydrophobic surface layers on the surface and in inner pores of the foam concrete, and the nanomaterial forms uniformly distributed nano-bulges on the hydrophobic surface layers formed by the silane. The superhydrophobic performance of the foam concrete can be effectively improved by combining the two microstructures. The foam concrete exhibits excellent superhydrophobic performance.

Abstract: The disclosure relates to the technical field of building materials, and in particular, to lightweight aggregate ultra-high performance concrete (UHPC) and a preparation method thereof. The lightweight aggregate UHPC provided in the disclosure is prepared from the following components in parts by weight: cement 220-260 parts; silica fume 100-120 parts; expanded perlite powder 120-160 parts; expanded perlite 230-260 parts; polycarboxylate superplasticizer 15-20 parts; steel fiber 76-93 parts; and water 140-160 parts, where a maximum particle size of the expanded perlite powder is 0.075 mm; and a particle size range of the expanded perlite is 0.075-0.6 mm. The lightweight UHPC prepared according to the design of the disclosure has excellent density performance, and can satisfy requirements of concrete components, etc.

Abstract: A life-cycle performance intelligent-sensing and degradation warning system and method for concrete structures are disclosed. The warning system comprises a main control module, a multifunctional sensor module, an anti-theft module and a critical warning module. Environmental parameters in concrete are monitored by the multifunctional sensor module, and the remaining service life of a concrete structure is accurately predicted through a life prediction model according to the temperature, humidity, chloride ion concentration and pH at different depths, and a critical chloride ion concentration and a structure stress status that are dynamically obtained.

Abstract: A nano-silver dispersion and a preparation method thereof is disclosed. The method, includes: mixing ?-aminopropyltriethoxysilane, polyvinylpyrrolidone, sodium lauryl sulfate, silver nitrate and water, and conducting a chelation, to obtain a chelating dispersion, wherein before the mixing, the ?-aminopropyltriethoxysilane is exposed to the air for less than 5 min; and dropwise adding a sodium borohydride solution into the chelating dispersion, to obtain a mixture, and subjecting the mixture to an oxidation-reduction reaction, to obtain the nano-silver dispersion.

Abstract: A life-cycle performance intelligent-sensing and degradation warning system and method for concrete structures are disclosed. The warning system comprises a main control module, a multifunctional sensor module, an anti-theft module and a critical warning module. Environmental parameters in concrete are monitored by the multifunctional sensor module, and the remaining service life of a concrete structure is accurately predicted through a life prediction model according to the temperature, humidity, chloride ion concentration and pH at different depths, and a critical chloride ion concentration and a structure stress status that are dynamically obtained.

Abstract: A superhydrophobic coating is provided and contains organosilane, an inorganic nanomaterial, and an emulsifying agent. A mass proportion of the components is controlled, so that the superhydrophobic coating can form a micro-nano mixed microstructure inside foam concrete. The organosilane first forms dense hydrophobic surface layers on the surface and in inner pores of the foam concrete, and the nanomaterial forms uniformly distributed nano-bulges on the hydrophobic surface layers formed by the silane. The superhydrophobic performance of the foam concrete can be effectively improved by combining the two microstructures. The foam concrete exhibits excellent superhydrophobic performance.

Abstract: The present invention relates to the field of building surface coating technologies, and in particular, to an alumina sol-silane composite material and a preparation method and application thereof. The alumina sol-silane composite material provided in the present invention is prepared by raw materials including the following components by weight parts: 5 to 45 parts of alumina sol, 30 to 90 parts of silane, 3 to 10 parts of silane coupling agent, and 1 to 5 parts of dispersant. A hydrophobic anticorrosive coating can be formed after coating the alumina sol-silane composite material provided in the present invention to a surface of a cement-based material, and has good waterproof performance and corrosion resistance.

Abstract: The present invention relates to the field of building surface coating technologies, and in particular, to an alumina sol-silane composite material and a preparation method and application thereof. The alumina sol-silane composite material provided in the present invention is prepared by raw materials including the following components by weight parts: 5 to 45 parts of alumina sol, 30 to 90 parts of silane, 3 to 10 parts of silane coupling agent, and 1 to 5 parts of dispersant. A hydrophobic anticorrosive coating can be formed after coating the alumina sol-silane composite material provided in the present invention to a surface of a cement-based material, and has good waterproof performance and corrosion resistance.

Abstract: A folding slab and a central column composite joint and an assembly method thereof, wherein the folding slab and a prefabricated column-beam composite joint adopting a steel-wood composite structure guarantees a construction quality, improves a construction efficiency, and optimizes a seismic performance of a structure. The folding slab and the central column composite joint including a steel-wood composite column, square wood columns, connecting assemblies for connecting the steel-wood composite column and the square wood beams, and folding wood slabs connected with and supported by the steel-wood composite column, the square wood columns and the connecting assemblies.