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A great number of urban underground concrete water drainage systems in China are facing challenges of corrosion, blockage, and leakage. This could result in engineering accidents such as urban inland inundation, pipeline collapse, leakage, and blockage. The common contributing factors for pipeline leakage and blockage are the porous structures and the perishable surfaces of concrete pipes. To address these issues, we synthesized superhydrophobic coating materials such as SiO2 aerosol, bisphenol A diglycidyl ether (DGEBA), and N-β-aminoethyl-γ-aminopropyltrimethoxysilane (AEAPTS). Our superhydrophobic coating on cement-based surfaces presents good waterproof ability, mechanical stability, and self-cleaning properties. Test results show that the superhydrophobic coating exhibits higher water discharge capacity and survivability to corrosive underground water drainage pipeline environments. Hence, this SiO2 aerosol @ bisphenol A diglycidyl ether coating possesses enormous potential in surface modification of pipeline rehabilitation materials.

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Reconfigurable manufacturing system (RMS) is designed around a specific part family. Reconfigurable machine tools (RMT) is the core facility of RMS. One RMT system is an RMS consisting of only one RMT. So, the RMT of one RMT system is designed for a specific part family, which integrates the characteristics of RMS and RMT. The reconfiguration path problem of one RMT system is an urgent problem to be solved. Therefore, an optimal reconfiguration path decision method for one RMT system is proposed in this paper. The objective is to produce the entire part family at the minimum reconfiguration effort. Reconfiguration time is adopted as the characteristic value of reconfiguration effort in this paper. The Tabu Search algorithm (TS) is used to solve this problem due to its excellent search ability. Process rule is considered during computation to obtained reasonable solution. A case study is given to implement the proposed method. The result shows that the proposed method can produce an optimal reconfiguration path for one RMT system satisfying the process rule.