Study of Cement-Based Superhydrophobic Composite Coating: New Option for Water Drainage Pipeline Rehabilitation

Abstract

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.

Effect of EVA Polymer and PVA Fiber on the Mechanical Properties of Ultra-High Performance Engineered Cementitious Composites

“…The specific reason is that the modified material can significantly enhance the dispersion ability between fiber and cement, better combine the matrix and fiber material, increase the interfacial adhesion, and thus, enhance the overall flexural strength of the material. The modified PVA fiber matrix is an ideal material for underground infrastructure reconstruction [ 25 ].…”

Durability Study on High-Performance Fiber-Reinforced Mortar under Simulated Wastewater Pipeline Environment

“…Extensive studies have been conducted to facilitate a better understanding and control of the deterioration process of sewer concrete pipeline structures, through a variety of research works [ 14 , 15 , 16 ]. Some chemical acids were used as the corrosive agents of the concrete material corrosion.…”

Novel Nano-Precursor Inhibiting Material for Improving Chloride Penetration Resistance of Concrete: Evaluation and Mechanism

“…Feng [21] found that mortar became hydrophobic by addition of stearic acid aqueous emulsion, the resistance of water and chloride penetration into concrete was enhanced, but the mechanical strength declined severely. Polymers were also used to modify the surface of cement-based materials [22][23][24][25][26], and the durability was improved [27][28][29][30][31]. Some hydrophobic metal soaps were also used to modify the properties of concrete by depositing hydrophobic layers on the pore surface, but there were doubts about their long-term effects.…”