Cracking caused by shrinkage deformation of cement-based materials at early age is a major problem leading to material failure in restrained conditions. Carbon nanotubes (CNTs) are incorporated into cement-based materials, and the autogenous shrinkage and crack resistance of the new composite materials obtained by linear shrinkage and ring tests are studied to solve the destruction of the materials caused by the shrinkage of cement-based materials. The results showed that addition of CNTs significantly inhibited the autogenous shrinkage of cement-based materials with maximum reduction rate above 40%. CNTs also significantly improved the cracking resistance of cement-based materials. The optimal effect was noticed at CNTs content of 0.1 wt%. The incorporation of CNTs not only inhibits the autogenous shrinkage of cement-based materials, but also inhibits the drying shrinkage of cement-based materials to some extent. Therefore, carbon nanotubes have the potential to solve the destruction of materials caused by shrinkage of cement-based materials.

中文翻译：

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碳纳米管增强水泥基材料的自收缩和抗裂性能

水泥基材料早期收缩变形引起的开裂是导致材料在受约束条件下失效的主要问题。将碳纳米管（CNTs）掺入水泥基材料中，研究通过线收缩和环试验获得的新型复合材料的自收缩和抗裂性能，解决水泥基材料收缩对材料造成的破坏. 结果表明，CNTs的加入显着抑制了水泥基材料的自收缩，最大收缩率在40%以上。碳纳米管还显着提高了水泥基材料的抗裂性。在 0.1 wt% 的 CNTs 含量下观察到最佳效果。碳纳米管的掺入不仅抑制了水泥基材料的自收缩，还能在一定程度上抑制水泥基材料的干缩。因此，碳纳米管具有解决水泥基材料收缩引起的材料破坏的潜力。