铁钡氧体对水泥净浆体积稳定性影响研究
摘 要
核电是当今和未来世界重要的绿色清洁能源，对人类的生存发展起着至关重要的作用。牺牲材料是第三代核电站的重大技术革新，通过牺牲材料的使用，使得核电站在严重核事故中的安全性大大提高。铁钡氧体具有良好的导电性、抗辐射性和抗退磁能力，有望用来制备新型水泥基核电牺牲材料。因此，本文探究铁钡氧体对水泥净浆的体积稳定性的影响规律。
本文的主要研究内容如下：研究不同掺量的铁钡氧体对水泥净浆体积稳定性的影响，主要研究水泥净浆的干缩性能和自收缩。此外，还研究了铁钡氧体的基本性能表征和铁钡氧体对水泥净浆的力学性能、微观结构的影响。首先制备铁钡氧体含量为0%、5%、10%、15%、20%的水泥净浆试件，然后在标准养护条件下对其进行养护，采用比长仪测量水泥净浆试件1d、3d、7d、14d、28d、56d、91d的长度，进而得到其干缩。此外本文还采用波纹管和非接触式探头相结合的方式测量水泥净浆自收缩。
关键词：铁钡氧体，体积稳定性，水泥净浆，自收缩
Abstract
Nuclear power is an important green and clean energy in the world today and in the future, which plays an important role in human survival and development. Sacrificial materials are the major technological innovation of the third generation nuclear power plant. In serious nuclear accidents, the safety of nuclear power plants is greatly improved by sacrificing the use of materials. BaFe12O19 has good conductivity, radiation resistance and demagnetization resistance, which is expected to be used to prepare new cement-based nuclear sacrificial materials. Therefore, this paper explores the influence of BaFe12O19 on the volume stability of cement paste.
The main contents of this paper are as follows: the influence of different contents of BaFe12O19 on the volume stability of cement paste is studied, and the dry shrinkage and autogenous shrinkage of cement paste are mainly studied. In addition, the basic properties of BaFe12O19 and the effect of BaFe12O19 on the mechanical properties and microstructure of cement paste were also studied. The drying shrinkage properties of the specimens with different content of BaFe12O19(0%, 5%, 10%, 15% and 20%) were measured by a specific length meter on the 1st, 3rd, 7th, 14th, 28th, 56th and 91th days, and then the drying shrinkage rate could be obtained. The autogenous shrinkage of mortar was measured by a combination of corrugated tube and non-contact detector.
Key words：BaFe12O19, cement-based material, volume stability, autogenous shrinkage
