本文關鍵詞：新型石灰石土抗壓強度試驗及微觀機理研究　出處：《安徽理工大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 土 石灰 石灰石 磷酸氫二銨 抗壓強度 膠結機理

【摘要】：隨著時代的發(fā)展,土木工程中對材料的要求越來越高,石灰三合土(石灰土)強度發(fā)展緩慢且相對較低的特點使得自身應用受到限制。但三合土具有易取材、易施工、造價低的優(yōu)點,是一種相對經濟和環(huán)保的工程材料,在路基、壩體、基礎等工程中仍有應用。因此,尋求一種有效、可行的新方法來提高土體抗壓強度就成為了一項有意義的研究課題。本文以石灰土作為對照,用石灰石替換石灰土中的熟石灰得到新的土體——石灰石土,并用DAP(磷酸氫二銨)作為添加劑,分別以0、1%、2%、4%、8%的比例加入兩種土中,得出各組試樣的抗壓強度變化情況,并結合SEM實驗和XRD實驗進行微觀分析,以此探究該方法對土體的加固效果及其加固的機理。試驗結果表明:1)石灰石替代熟石灰后,使得土樣在7天的抗壓強度降低了 17.46%,且前后強度基本無發(fā)展,108天時的抗壓強度與石灰土相比降低了 68.64%;2)石灰石土中的DAP添加量達到2%后,試樣的抗壓強度隨著DAP量的增加而逐漸提升,試驗中添加8%的DAP對土體的加固效果最好,使得石灰石土的7 天、28 天、56 天、108 天抗壓強度分別提高了 298.07%、417.64%、469.81%、494.34%;3)石灰土中,DAP的最優(yōu)添加量為2%,可以使得石灰土前期(7天)和后期(108天)的抗壓強度分別提高73.02%和13.61%,不僅早期強度發(fā)展較快,而且后期強度仍緩慢提高;4)當石灰石土的DAP添加量達到4%時,其前期、后期的抗壓強度均大于DAP添加量為2%的石灰土;5)石灰石土加入DAP后,依靠CaCO3與DAP反應生成凝膠物質,膠結土體,提高土體的強度。綜上所述,以石灰石替代石灰,并加入不少于4%的DAP作為添加劑,是本文探索出的提高土體抗壓強度的新方法。該方法在提高土體強度的同時,還可以減少工程中石灰的使用,減少石灰生產過程中產生的能源消耗和大氣污染,達到節(jié)能減排的目的。
[Abstract]:With the development of the times, the demand for materials in civil engineering is higher and higher. The characteristics of slow development and relatively low strength of lime trinity (lime soil) make its application limited. The advantages of easy construction and low cost are relatively economical and environmentally friendly engineering materials, which are still used in subgrade, dam, foundation and so on. The feasible new method to improve the compressive strength of soil has become a meaningful research topic. In this paper, limestone is used to replace the slaked lime in lime soil to obtain new soil-limestone soil. With DAP (diammonium hydrogen phosphate) as additive, the compressive strength of each group of samples was obtained by adding 8% ratio of 0 ~ 1 / 2 and 4% to two kinds of soil respectively. Combined with SEM experiment and XRD experiment, the microcosmic analysis was carried out to explore the reinforcement effect of this method on soil and its reinforcement mechanism. The experimental results show that: 1) Limestone replaced the hydrated lime. The compressive strength of the soil sample in 7 days was reduced by 17.46%, and the compressive strength of the soil sample decreased by 68.64% compared with lime soil at 108 days after the development of the strength. 2) when the content of DAP in limestone soil reaches 2%, the compressive strength of the sample increases with the increase of DAP content, and the strengthening effect of the soil is best with the addition of 8% DAP in the test. The compressive strength of limestone soil was increased by 298.07 days, 417.64 days and 469.81 days, respectively, and the compressive strength of limestone soil was increased by 298.07 days, 28 days and 56 days and 108 days, respectively. 3) the optimum addition amount of DAP in lime soil is 2, which can increase the compressive strength of lime soil by 73.02% days and 13.61% days, respectively. Not only the early strength developed rapidly, but also the later strength increased slowly. 4) when the DAP content of limestone soil reaches 4%, the compressive strength of lime soil in the early and late stages is higher than that of lime soil with DAP addition amount of 2%; 5) after adding DAP to limestone soil, CaCO3 reacts with DAP to form gel material, cement soil and improve the strength of soil. To sum up, limestone is used to replace lime. Adding not less than 4% DAP as additive is a new method to improve the compressive strength of soil, which can not only increase the strength of soil, but also reduce the use of lime in engineering. Energy consumption and air pollution in lime production are reduced to achieve the purpose of energy saving and emission reduction.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU521

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