Guerrero A, Goñi S, Allegro V R
Eduardo Torroja Institute for Construction Science (CSIC), C/Serrano Galvache, 4, 28033 Madrid, Spain.
J Hazard Mater. 2009 Jan 30;161(2-3):1250-4. doi: 10.1016/j.jhazmat.2008.04.086. Epub 2008 Apr 29.
The resistance of class C fly ash belite cement (FABC-2-W) to concentrated sodium sulphate salts associated with low level wastes (LLW) and medium level wastes (MLW) is discussed. This study was carried out according to the Koch and Steinegger methodology by testing the flexural strength of mortars immersed in simulated radioactive liquid waste rich in sulphate (48,000 ppm) and demineralised water (used as a reference), at 20 degrees C and 40 degrees C over a period of 180 days. The reaction mechanisms of sulphate ion with the mortar was carried out through a microstructure study, which included the use of Scanning electron microscopy (SEM), porosity and pore-size distribution and X-ray diffraction (XRD). The results showed that the FABC mortar was stable against simulated sulphate radioactive liquid waste (SSRLW) attack at the two chosen temperatures. The enhancement of mechanical properties was a result of the formation of non-expansive ettringite inside the pores and an alkaline activation of the hydraulic activity of cement promoted by the ingress of sulphate. Accordingly, the microstructure was strongly refined.
讨论了C类粉煤灰贝利特水泥（FABC - 2 - W）对与低放废物（LLW）和中放废物（MLW）相关的浓硫酸钠盐的抗性。本研究按照科赫和施泰内格的方法进行，通过测试在20摄氏度和40摄氏度下浸泡在富含硫酸盐（48,000 ppm）的模拟放射性液体废物和去离子水（用作参考）中的砂浆的抗折强度，为期180天。通过微观结构研究来探究硫酸根离子与砂浆的反应机理，其中包括使用扫描电子显微镜（SEM）、孔隙率和孔径分布以及X射线衍射（XRD）。结果表明，在所选的两个温度下，FABC砂浆对模拟硫酸盐放射性液体废物（SSRLW）的侵蚀具有稳定性。力学性能的增强是由于孔隙内形成了非膨胀性钙矾石以及硫酸盐的侵入促进了水泥水化活性的碱性活化。因此，微观结构得到了显著细化。
