铜污染土的固化方法及强度特性研究

发布时间：2018-06-20 02:25

本文选题：水泥 + 粉煤灰　；参考：《南京理工大学》2016年硕士论文

【摘要】：随着工业化的快速发展,重金属污染现象日益严重。其中铜污染引发的问题比较突出,不仅对人体健康和生态环境造成了危害,而且严重影响了工程建设。因此开展铜污染土的基本性质研究,并与工程实际相结合,是我国社会发展和环境岩土工程学科发展的迫切需要。本文通过水泥、水泥掺粉煤灰、水泥掺石灰固化处理铜污染土试验,研究了三种固化方法下铜污染土的强度变化规律,进而对影响强度发展的各方面因素进行探讨。另外,还对比分析了三种不同固化方法下铜污染土的强度差异,并进一步研究了掺入粉煤灰和石灰对水泥固化铜污染土强度的影响。取得以下主要成果：(1)当铜离子掺量低于0.3%时,三种固化方法下土体无侧限抗压强度都随着铜离子掺量的增加先提高后降低,但变化幅度不大；当铜离子掺量达到0.5%时,三种固化方法下土体无侧限抗压强度明显下降。另外三种固化方法下土体无侧限抗压强度都随着固化剂掺量和龄期的增加有不同幅度的提高。(2)当固化剂总掺量相同时,7、14天龄期下,铜离子掺量低于O.3%时,水泥单独固化处理铜污染土的效果比组配固化效果好；当铜离子掺量达到0.5%时,组配固化效果稍稍优于水泥单独固化效果。而28、56天龄期下,水泥单独固化效果比组配固化效果好,此时与铜离子掺量无关。另外,各个龄期下两种组配的固化效果差别不大。(3)当水泥掺量相同或相近时,7、14天龄期下,铜离子掺量低于O.3%时,掺入粉煤灰、石灰对水泥固化效果起不利作用；当铜离子掺量达到0.5%时,掺入粉煤灰、石灰对水泥固化效果起有利作用。而28、56天龄期下,掺入粉煤灰、石灰对水泥固化效果起不利作用,此时与铜离子掺量无关。
[Abstract]:With the rapid development of industrialization, heavy metal pollution is becoming more and more serious. The problems caused by copper pollution are not only harmful to human health and ecological environment, but also to engineering construction. Therefore, it is an urgent need for the development of society and environmental geotechnical engineering to study the basic properties of copper contaminated soil and combine it with engineering practice. In this paper, through the experiment of treating copper contaminated soil with cement, fly ash and lime cement, the change rule of strength of copper contaminated soil under three curing methods is studied, and the factors influencing the development of strength are discussed. In addition, the strength differences of copper contaminated soil under three different curing methods were compared and analyzed, and the influence of fly ash and lime on the strength of cement solidified copper contaminated soil was further studied. The main results are as follows: (1) when the content of copper ion is lower than 0.3%, the unconfined compressive strength of soil increases first and then decreases with the increase of copper ion content, but the change is not large; when the copper ion content reaches 0.5%, the unconfined compressive strength of soil is increased first and then decreased with the increase of copper ion content. The unconfined compressive strength of soil decreased obviously under three curing methods. In the other three curing methods, the unconfined compressive strength of soil increased by different extent with the increase of curing agent content and age) when the total amount of curing agent was the same, the copper ion content was less than 0.3% at the age of 714 days. The effect of cement curing alone is better than that of mixed solidification, and when the amount of copper ion reaches 0.5%, the effect of combination curing is slightly better than that of cement alone. Under the age of 28 ~ 56 days, the curing effect of cement alone is better than that of combination curing, which has nothing to do with the amount of copper ion. In addition, the curing effect of the two combinations is not different at different ages. (3) when the cement content is the same or similar, when the copper ion content is less than 0.3%, the lime is harmful to the cement curing effect when the content of copper ion is lower than 0.3%. When the amount of copper ion reaches 0.5, fly ash and lime play a favorable role in cement solidification. At the age of 28 ~ 56 days, the addition of fly ash and lime has adverse effect on the solidification effect of cement, but it has nothing to do with the amount of copper ion.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X53;TU472

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