3 results about "Air voids" patented technology

A method of applying a weather-proofing asphalt membrane composition to a wooden railroad tie having cracks and... or air voids on its surface, the method comprising: applying the composition onto the

This invention discloses a prefabricated steel track panel and its laying method. The prefabricated steel track panel includes a bottom support plate, a lower sealing plate, an annular side plate, and a top cover plate. The bottom support plate includes a soft pad and multiple hard support plates. The method includes leveling the foundation; laying the first prefabricated steel track panel; installing a semi-circular connecting block and a positioning block; laying the next prefabricated steel track panel; repeating steps three and four until all prefabricated steel track panels are laid; connecting each adjacent pair of prefabricated steel track panels with locking pins; and injecting sealant into the gap between each adjacent pair of prefabricated steel track panels. This invention has a reasonable structural design and is convenient and simple to lay. The deformation of the soft pad compensates for the gap between the steel track surface and the base layer, preventing air voids. The connection between the steel track panels is achieved by the locking pins and the semi-circular connecting blocks in conjunction with the connecting grooves, allowing the steel track panels to be connected in a detachable manner, eliminating destructive disassembly and assembly work.

The invention relates to a design method of an ultra-compact asphalt mixture. The design method comprises the following steps: S1, selecting the grading type of the asphalt mixture, the number and particle size specification of composition specifications of coarse aggregate, and the types and specifications of fine aggregate and mineral powder filler; s2, acquiring physical property parameters of the selected aggregates; s3A: generating a plurality of groups of mineral aggregate proportions, establishing a main skeleton discrete element model of each mineral aggregate proportion, and calculating a mineral aggregate void rate and a main skeleton tight loading density of a coarse aggregate main skeleton; s3B, calculating the designed void ratio according to the grading type and the coarse aggregate composition specification; s4, respectively calculating the asphalt dosage of each group of mineral aggregate proportion; and S5, calculating the powder-binder ratio and the oil film thickness of each group of mineral aggregate proportion, and selecting the mineral aggregate proportion of which the powder-binder ratio and the oil film thickness accord with a preset range as specific parameters of the asphalt mixture. According to the design method of the super-compact asphalt mixture, the super-compact asphalt mixture can be designed.