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真空脱水改变了硬化后的混凝土结构特征,表现为总孔隙率下降,大孔含量下降更大,孔径尺度减小,贯穿孔减少,结构较普通混凝土均匀致密。上层混凝土变化尤其明显,形成特别致密的表层结构。混凝土结构特征的变化使混凝土性能得以改善:强度提高,早期强度提高更大;耐磨性、抗渗性、抗冰冻等性能提高;混凝土表面缺陷与内部裂缝等隐患减少。真空脱水技术随着我国发明了“V_(82)型混凝土气垫薄膜真空吸水装置”,已在国内道路、机场、水工等混凝土工程中迅速推广,不仅取得了节约水泥等明显的经济效益,而且改善了混凝土性能,提高了工程质量。
Vacuum dehydration changed the characteristics of the concrete structure after hardening, showing that the total porosity decreased, the macroporous content decreased more, the pore size decreased, the through-hole reduced, and the structure was even and dense compared to ordinary concrete. The change of the upper concrete is particularly obvious, forming a particularly dense surface structure. The changes in the characteristics of the concrete structure have improved the performance of the concrete: the strength has been improved, the early strength has been improved more, and the wear resistance, impermeability, antifreeze and other properties have been improved, and the concrete surface defects and internal cracks have been reduced. Vacuum dehydration technology has been rapidly promoted in domestic roads, airports, hydraulics and other concrete projects as China invented the “V_(82) concrete air-cushion film vacuum suction device”, which not only achieved significant economic benefits such as saving cement, but also Improve the performance of concrete and improve the quality of the project.