With the increasing number of hydraulic structures in service, many scholars have investigated the performance of saturated concrete, however, there are few studies on the influences of different contents and types of nanomaterials on the performance of fully saturated concrete. In this paper, a series of saturated concrete experiments with different types and contents of nanomaterials are conducted, and the microstructure, mechanical properties of samples are compared and analysed. The results show that: (1) By the addition of various kinds of nanomaterials to saturated concrete, the microstructure of saturated concrete is significantly improved, and the compactness and integrity of the slurry are improved (2) The mechanical properties of saturated concrete are significantly improved by the addition of 3 wt% nanomaterials. And the compressive strength of the saturated concrete sample containing 3 wt% nano-Al2O3 is the largest and the deformation modulus of the saturated concrete sample containing 6 wt% nano-Al2O3 is the largest. (3) Compared with dry concrete, when the concrete is saturated, the modifying effect of nanomaterials on the mechanical properties of concrete is weakened. The results of this study have important guiding significance for the study of the nano-modification of hydraulic structures.

中文翻译：

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纳米材料对长期浸水条件下全饱和混凝土力学性能的改性

随着在役水工建筑物数量的不断增加，许多学者对饱和混凝土的性能进行了研究，但关于纳米材料的不同含量和类型对全饱和混凝土性能影响的研究较少。本文通过一系列不同类型、不同纳米材料含量的饱和混凝土实验，对样品的微观结构、力学性能进行了对比分析。结果表明：（1）在饱和混凝土中加入各种纳米材料，显着改善了饱和混凝土的微观结构，提高了浆体的密实度和完整性（2）饱和混凝土的力学性能显着提高。通过添加 3 wt% 的纳米材料来改善。含3wt%纳米Al2O3的饱和混凝土试样的抗压强度最大，含6wt%纳米Al2O3的饱和混凝土试样的变形模量最大。(3) 与干混凝土相比，当混凝土处于饱和状态时，纳米材料对混凝土力学性能的改性作用减弱。本研究结果对水工结构纳米改性研究具有重要的指导意义。