纳米C-S-H凝胶对喷射混凝土性能的影响
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1.桂林理工大学土木与建筑工程学院;2.广西田新高速公路有限公司

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TU528

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广西重点研发计划项目(2021AB22157)


Effect of Nano C-S-H materials on the properties of Shotcrete
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College of Civil and Architecture Engineering, Guilin University of Technology

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    摘要:

    为解决普通喷射混凝土凝结时间长、早期强度低和抗渗性能差等问题,通过外掺纳米C-S-H(Calcium-silicate-hydrate,水化硅酸钙凝胶)材料的方式对其进行性能提升。以凝结时间、力学性能以及抗渗性能为宏观指标,并借助水化热测试、XRD(X-ray diffraction,X射线衍射)和SEM(Scanning electron microscope,扫描电子显微镜)等微观技术探究了纳米C-S-H材料对喷射混凝土水化规律及微观形貌的影响。结果表明,纳米C-S-H凝胶可明显缩短掺速凝剂水泥净浆的凝结时间,与基准组相比,掺2%纳米C-S-H凝胶的喷射混凝土1 d抗压强度可提高19.0%,渗水深度降低31.4%。机理分析表明,纳米C-S-H材料的晶核和填充效应能够促进水泥水化,且可以改善混凝土的内部结构,从而提升喷射混凝土的各项性能。

    Abstract:

    In order to solve the problems of long setting time, low early strength and poor impermeability of ordinary sprayed concrete, the performance of ordinary sprayed concrete was improved by adding nano-C-S-H (Calcium Silicate-Hydrate) material. Taking setting time, mechanical properties and impermeability as macro indicators, and with the help of micro technologies such as hydration heat test, XRD(X-ray diffraction) and SEM(Scanning electron microscope), the influence of nano-C-S-H materials on the hydration law and micro-morphology of sprayed concrete was explored. The results show that nano-C-S-H gel can obviously shorten the setting time of cement paste mixed with accelerator. Compared with the reference group, the 1-day compressive strength of sprayed concrete mixed with 2% nano-C-S-H gel can be increased by 19.0% and the water seepage depth can be reduced by 31.4%. The mechanism analysis shows that the crystal nucleus and filling effect of nano-C-S-H material can promote the hydration of cement and improve the internal structure of concrete, thus improving the properties of sprayed concrete.

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冉耀,周楚淮,高宇,等. 纳米C-S-H凝胶对喷射混凝土性能的影响[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-18
  • 最后修改日期:2024-05-22
  • 录用日期:2024-05-29
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