本文關(guān)鍵詞： 棉花秸桿 脫硫石膏 固化樁 力學(xué)性能 配合比　出處：《安徽理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：棉花秸稈是棉花種植的主要副產(chǎn)物,對其有效的處理是一個關(guān)乎環(huán)境保護和資源利用的問題。本文以解決這一問題為出發(fā)點,立足于棉花秸稈良好的物理力學(xué)性能,將其類比于鋼筋混凝土中的"鋼筋"用于地基后期加固,為棉花秸稈的大量消耗提供了一種有效途徑。作為燃煤電廠煙氣脫硫的重要副產(chǎn)物,脫硫石膏的循環(huán)利用受到許多學(xué)者的關(guān)注,但這些研究大部分需要將脫硫石膏煅燒形成建筑脫硫石膏以激發(fā)活性。本文則另辟蹊徑,在原狀脫硫石膏中加入礦渣、土、激發(fā)劑來形成脫硫石膏基膠凝材料用做地基加固固化劑。并將固化膠凝材料灌入到秸稈捆中經(jīng)固化硬化成為棉花秸稈-脫硫石膏基固化樁。固化樁可以與土形成樁體復(fù)合地基來增強吹填土的強度。課題前期在前人研究基礎(chǔ)上通過單因素實驗和對比實驗確定了固化樁成分的摻加范圍和實驗條件。之后用正交實驗方法研究了棉花秸稈的密度、礦渣與脫硫石膏的質(zhì)量比、水添加量、激發(fā)劑摻量這5個因素對棉花秸稈-脫硫石膏基固化樁的物理特征和力學(xué)性能的影響,主要包括密度、抗壓強度、抗折強度、彈性模量、軟化系數(shù)、吸水率等。不同配合比的固化樁試件中,最高抗壓強度為14.69MPa、最高抗折強度達到1.24 MPa、軟化系數(shù)最大為0.97,說明了棉花秸稈-脫硫石膏基材料有優(yōu)秀的應(yīng)用前景。在工程現(xiàn)場的實驗條件下,對因素影響下的各性能進行分析,確定了固化樁在實踐中使用的最優(yōu)配比:A2B3C3D3E4,即在30%土,28%脫硫石膏和42%礦渣中加入水固比為0.25的水、1.5%的NaOH和15g/cm3的棉花秸稈。制成的固化樁不僅尺寸規(guī)整、密度適中、返霜量少、并且在滿足一定抗壓強度的條件下有著較高的抗折、抗變形、抗軟化的性能。進一步結(jié)合固化樁材料的機理研究,闡釋了拌合物結(jié)合的固化硬化過程、凈漿與秸稈之間的連接方式,為秸稈加固吹填土、秸稈加筋膠凝材料、脫硫石膏基凈漿等領(lǐng)域的研究開展起到借鑒作用。
[Abstract]:Cotton straw is the main by-product of cotton planting, its effective treatment is a matter of environmental protection and resource utilization. In order to solve this problem as a starting point, based on the physical and mechanical properties of cotton straw good, the analogy to the reinforced concrete reinforced foundation for later reinforcement, provide an effective way for the large consumption of cotton straw. As an important byproduct of coal-fired power plant flue gas desulfurization, desulfurization gypsum recycling has been focused by many scholars, but most of these studies will need to form the construction of desulphurization gypsum desulfurization gypsum calcination to stimulate activity. This is another way, adding slag, in FGD gypsum in the soil. To form a foundation reinforcement activator for curing agent of gypsum based cementitious materials. And the curing of cementitious material poured into the straw after curing hardens into cotton straw - off The sulfur gypsum curing. Curing pile pile can form pile composite foundation and soil to enhance the dredger fill strength. The previous study on the basis of previous studies by single factor experiment and contrast experiment to determine the range of experimental conditions and adding curing pile composition. After using the orthogonal experiment method to study the cotton straw density, quality of slag with the desulfurization gypsum ratio, water content, affect the physical characteristics of cotton straw gypsum based curing piles and the mechanical properties of the activator content of these 5 factors, including density, compressive strength, flexural strength, elastic modulus, softening coefficient, water absorption rate. Different curing ratio of pile specimens in the highest compressive strength was 14.69MPa, flexural strength reached 1.24 MPa, the maximum softening coefficient is 0.97, the cotton straw gypsum based materials have excellent application prospect. On the site under the experimental conditions, The performance factors were analyzed to determine the optimal proportion of curing piles used in practice: A2B3C3D3E4, which is 30% in the soil, adding water solid ratio of 0.25 water 28% desulfurization gypsum and 42% slag, 1.5% NaOH and 15g/cm3 made of cotton straw. Curing pile not only size regular, moderate density back, frost less, and resistance to deformation under certain conditions with compressive strength bending strength, high performance, resistance to softening. Combining with the mechanism of curing pile materials, curing and hardening process of mixture combination explains the connection between the paste and straw, straw reinforcement for dredger fill that straw reinforced cementitious materials, study on desulfurization gypsum paste and other areas to carry out reference to the role.

【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1

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