自来水厂污泥灰在稳定水泥浆体体积方面的应用。
The application of waterworks sludge ash to stabilize the volume of cement paste.
作者信息
Luo H L, Kuo W T, Lin D F
机构信息
Department of Civil and Ecological Engineering, I-Shou University, 1, section 1, Hsueh-Cheng Rd., Ta-Hsu Hsiang, Kaohsiung County, Taiwan, 84008, ROC.
出版信息
Water Sci Technol. 2008;57(2):243-50. doi: 10.2166/wst.2008.015.
In order to extend the recycling of waterworks sludge to engineering applications, this paper addresses the influence of nano-SiO2 on incinerated waterworks sludge ash (IWSA) cement paste attacked by sulfate. Tests were performed such as length measurement for volume change, compressive strength, weight loss, and micro-structural testing using scanning electron microscopy (SEM). The results indicate that when a portion of the cement in the paste was replaced by IWSA, the IWSA diluted the cementitious material C3A, and filled the capillary pores in the hardened paste. Moreover, since IWSA has potential pozzolanic activity, it can chemically react with Ca(OH)2 crystals in the paste and can consequently improve the resistance of the paste to sulfate attack. Test results also show that due to the fully developed pozzolanic effect of IWSA, the major reaction products of sulfate attack, gypsum and ettringite, were clearly reduced. Hence, the expansion rate in length decreased with the increase of IWSA replacement. Furthermore, the addition of nano-SiO2 to IWSA cement paste can also reduce the length expansion rate.
为了将自来水厂污泥的回收利用扩展到工程应用中，本文研究了纳米二氧化硅对受硫酸盐侵蚀的自来水厂焚烧污泥灰（IWSA）水泥浆体的影响。进行了诸如体积变化的长度测量、抗压强度、重量损失以及使用扫描电子显微镜（SEM）进行微观结构测试等试验。结果表明，当浆体中的一部分水泥被IWSA替代时，IWSA稀释了胶凝材料C3A，并填充了硬化浆体中的毛细孔。此外，由于IWSA具有潜在的火山灰活性，它能与浆体中的Ca(OH)2晶体发生化学反应，从而提高浆体对硫酸盐侵蚀的抗性。试验结果还表明，由于IWSA的火山灰效应充分发挥，硫酸盐侵蚀的主要反应产物石膏和钙矾石明显减少。因此，长度膨胀率随IWSA替代量的增加而降低。此外，向IWSA水泥浆体中添加纳米二氧化硅也可以降低长度膨胀率。
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