The high hydrophilicity and permeability of concrete caused by many pores and hydroxyl groups produced by cement hydration are the main factors leading to dry shrinkage, cracking, and poor corrosion resistance of concrete. Giving concrete internal curing and hydrophobicity is an effective measure to solve the above problems. In this paper, a new idea and preparation method for an organic combination of hydrophilic and hydrophobic materials are proposed to improve the service life of concrete structures. Furthermore, the combined effects of hydrophilic and hydrophobic amphoteric materials (HAM) on the mechanical properties, internal curing properties, and hydrophobic properties of concrete were comprehensively investigated. In addition, the physical and chemical action mechanisms were analyzed in conjunction with microscopic tests. The results indicated that HAM rapidly released water within 3–7 days before concrete curing, and then slowly released water accompanied by the release of hydrophobic materials, gradually from hydrophilic to hydrophobic properties; The addition of HAM did not reduce the mechanical properties of concrete, which solved the problem of low compressive strength of integral hydrophobic concrete; The addition of HAM reduced the drying shrinkage of concrete by 154.12 %, increased the contact angle to 96°, and decreased the water absorption rate by 36 %, allowing the concrete to achieve better internal curing and a hydrophobic effect. The preparation of this material can open up a new way to solve the hydrophilic and hydrophobic properties required by concrete at the same time, and fill the gap that concrete can not balance hydrophilic and hydrophobic properties.

中文翻译：

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混凝土中同时进行内部养护和憎水的新方法的研究


水泥水化产生的许多孔隙和羟基导致混凝土的高亲水性和渗透性是导致混凝土干缩、开裂和耐腐蚀性差的主要因素。赋予混凝土内部养护和憎水性是解决上述问题的有效措施。本文提出了一种亲疏水材料有机结合的新思路和制备方法，以提高混凝土结构的使用寿命。此外，全面研究了亲水和疏水两性材料 （HAM） 对混凝土力学性能、内部养护性能和疏水性能的综合影响。此外，还结合显微镜测试分析了物理和化学作用机制。结果表明，HAM 在混凝土养护前 3—7 天内迅速释放水分，然后缓慢释放水分，伴随着疏水物质的释放，逐渐从亲水变为疏水;HAM的添加并没有降低混凝土的力学性能，解决了整体憎水混凝土抗压强度低的问题;添加 HAM 使混凝土的干燥收缩率降低了 154.12 %，接触角增加到 96°，吸水率降低了 36 %，使混凝土实现了更好的内部养护和疏水效果。这种材料的制备可以为同时解决混凝土所需的亲水和疏水性能开辟一条新的途径，填补了混凝土无法平衡亲水和疏水性能的空白。