新型无熟料碱渣固化剂研制及其固化土力学性能试验研究

发布时间：2018-05-31 01:35

本文选题：碱渣 + 脱硫石膏　；参考：《上海大学》2014年硕士论文

【摘要】：坚持可持续发展道路，是我国一项长期的基本国策。可持续发展道路的核心是资源的循环利用，而工业废弃物作为一种特殊资源，如何将其变废为宝，走废弃物资源化道路，是一个非常具有现实意义的研究课题。碱渣和脱硫石膏都是我国常见的两种工业废弃物，，碱渣是氨碱法生产纯碱过程中产生的工业废渣，脱硫石膏是由火力发电厂烟气脱硫产生的废料。多年来，这两种固体废弃物的综合利用水平较低，最常用的处理方法就是就地堆积，然而这不仅占用耕地，而且破坏生态环境。本课题首先综合利用碱渣、矿渣、粉煤灰作为主要原材料，并掺入适量的脱硫石膏及复掺少量激发剂进行配合比设计，采用球磨工艺进行深加工，充分激发其活性，研制出一种能在物理力学性能方面基本取代32.5标号复合水泥技术要求的土壤固化剂——新型无熟料碱渣固化剂。然后对新型无熟料碱渣固化剂进行正交试验，探讨了各种原材料掺量对其强度、安定性、标准稠度需水量和凝结时间的影响，并根据强度和安定性等优选出最佳配合比。为了进一步了解最佳配合比下的新型无熟料碱渣固化剂性能，对其养护条件、耐久性能、水化热及微观等方面进行进一步分析，最终发现该固化剂的水化产物与水泥相似。通过对5种掺入比的新型无熟料碱渣固化土进行14d、28d、90d三种龄期的无侧限抗压强度试验、劈裂抗拉试验、压缩试验、三轴压缩试验研究了新型无熟料碱渣固化土的工程特性，并对新型无熟料碱渣固化土的抗压强度、抗拉强度、抗剪强度及应力-应变关系等方面的试验结果进行了分析，为该新型固化剂材料在实际工程方面的应用提供理论支撑。最后将新型无熟料碱渣固化土与同标号复合水泥土进行14d、28d、90d龄期的对比试验，对其结果进行分析，从而确定研究该固化剂作为土壤固化剂的可行性。此外从新型无熟料碱渣固化剂遇水后所产生的一系列化学反应及其与土发生复杂的化学反应的增强机理出发，结合碱渣的强碱性作用问题，探讨了新型无熟料碱渣固化土力学性能的影响机理。
[Abstract]:Adhere to the road of sustainable development, is a long-term basic national policy. The core of sustainable development road is the recycling of resources. As a special resource, how to turn industrial waste into treasure and take the road of recycling is a very important research topic. Alkali slag and desulphurized gypsum are two common industrial wastes in China. Alkali slag is the industrial waste produced in the production of soda by ammonia alkali process, and desulphurization gypsum is the waste produced by flue gas desulfurization in thermal power plant. For many years, the level of comprehensive utilization of these two kinds of solid wastes is relatively low, the most commonly used disposal method is local accumulation, but this not only occupies the cultivated land, but also destroys the ecological environment. In this paper, first of all, the alkali slag, slag and fly ash are used as the main raw materials, and the proper amount of desulphurization gypsum and a small amount of activator are added to the mix ratio design, and the deep processing is carried out by ball milling technology, and its activity is fully stimulated. A new type of soil-curing agent, a new alkali slag curing agent without clinker, was developed, which can basically replace the technical requirement of 32.5 grade composite cement in physical and mechanical properties. Then the orthogonal test was carried out on the new alkali-slag curing agent without clinker, and the effects of various raw material contents on strength, stability, standard consistency water requirement and setting time were discussed, and the optimum mix ratio was selected according to the strength and stability. In order to further understand the properties of the new alkali-slag curing agent without clinker under the optimum mixture ratio, the curing conditions, durability, hydration heat and microcosmic of the curing agent were further analyzed. Finally, it was found that the hydration product of the curing agent was similar to that of cement. The engineering properties of the new unclinker alkali slag solidified soil were studied by the unconfined compressive strength test, splitting tensile test, compression test and triaxial compression test of three ages of 14 days, 28 days and 90 days, on the basis of five kinds of new unclinker alkali slag solidified soil. The experimental results on the compressive strength, tensile strength, shear strength and stress-strain relationship of the new type of soil-cured soil without clinker are analyzed, which provides theoretical support for the application of the new curing agent in practical engineering. At last, a comparative test of 14 days to 28 days and 90 days of age was carried out between a new type of alkali slag solidified soil without clinker and composite cement soil of the same grade, and the results were analyzed, and the feasibility of the study on this curing agent as soil curing agent was determined. In addition, starting from a series of chemical reactions produced by the new alkali-slag curing agent without clinker and the strengthening mechanism of complex chemical reactions with soil, the paper combines the problem of strong alkalinity of alkali slag. The influence mechanism of the mechanical properties of new alkali-slag solidified soil without clinker was discussed.
【学位授予单位】：上海大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU41;X705

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