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  本文選題：紅粘土　切入點：固硫灰渣　出處：《重慶大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國高速公路及各級公路的不斷延伸，在紅粘土地區(qū)修建的公路也逐漸增多。紅粘土在我國主要分布在南方地區(qū)，作為路基填料時，存在大量路基病害問題，影響道路的強度和長期穩(wěn)定性。因此，為促進紅粘土地區(qū)的道路建設(shè)，應(yīng)找到一種經(jīng)濟合理、施工方便的措施對紅粘土進行改性，解決其作為路基填料時面臨的問題。 紅粘土液限高，屬于高液限土，作為路基填料時，收縮開裂比較嚴重。公路路基設(shè)計以及施工規(guī)范規(guī)定有些高液限土不能直接作為路基填料，必須通過處理后才能作為路基填料。常用的處理的方法有物理方法、化學(xué)方法以及物理化學(xué)結(jié)合的方法。 本文采用的紅粘土取自云南地區(qū)，通過物理性質(zhì)的測定，發(fā)現(xiàn)液限和塑性指數(shù)，不能滿足規(guī)范中對于直接作為路基填料的規(guī)定。因此將紅粘土作為路基填料時，必須采用措施進行處理。本文主要通過摻加固硫灰渣對其改性，使其滿足規(guī)范中對于路基填料的要求。通過進行不同固硫灰摻量下的液塑限、標準擊實試驗、加州承載比CBR試驗、收縮試驗、澆注成型試驗等，測定不同固硫灰摻量下的強度、收縮變形及水穩(wěn)定性。通過摻加固硫灰的直剪試驗，比較在相同擊實功、相同含水率的情況下，粘聚力和內(nèi)摩擦角的變化規(guī)律。 路基填料改性過程中傳統(tǒng)改性材料有水泥、石灰等，通過在紅粘土中摻加固硫渣，與摻加水泥、石灰的液塑限、強度、水穩(wěn)定性比較研究。研究固硫渣對紅粘土的強度、變形基水穩(wěn)定性的影響，對比不同改性材料對紅粘土的影響，得出改性規(guī)律。 固硫灰渣改性紅粘土微觀機理研究，在紅粘土中摻加固硫灰渣，改變了紅粘土的土體結(jié)構(gòu)連接形式，固硫灰渣與紅粘土反應(yīng)生成新的膠凝物質(zhì)，緊密的膠結(jié)起來。紅粘土中的微孔隙結(jié)構(gòu)多，固硫灰渣的細度大，既可以填充孔隙結(jié)構(gòu)，又能膠結(jié)成整體。固硫灰渣在水化的過程中吸收大量的水分，形成結(jié)合水，并且具有膨脹性，減小了因失水引起的收縮變形。
[Abstract]:With the continuous extension of highway and highway at all levels in our country, the number of highways built in red clay area is increasing gradually. Red clay is mainly distributed in the south of China, and there are a lot of roadbed diseases when it is used as subgrade filler. Therefore, in order to promote the road construction in the red clay area, an economical and convenient measure should be found to modify the red clay and solve the problems when it is used as the filling material of the roadbed. Red clay has high liquid limit and belongs to high liquid limit soil. When used as subgrade filler, shrinkage cracking is serious. Some high liquid limit soil can not be used as roadbed filler directly according to highway roadbed design and construction code. The common methods of treatment include physical method, chemical method and physico-chemical combination method. The red clay used in this paper is taken from Yunnan area. Through the determination of physical properties, it is found that the liquid limit and plastic index can not meet the requirements of the code for the direct subgrade filling. Therefore, when the red clay is used as the subgrade filler, Measures must be adopted to treat it. In this paper, the sulfur ash is modified to meet the requirements of subgrade fillers in the code, and the standard compaction test is carried out under the liquid plastic limit of different amount of sulfur fixing ash. California bearing ratio CBR test, shrinkage test, pouring molding test, etc., to measure the strength, shrinkage deformation and water stability of different sulfur fixed ash content. In the case of the same moisture content, the change of cohesion and internal friction angle is regular. In the course of roadbed filler modification, the traditional modified materials include cement, lime and so on. By adding sulfur slag in red clay, comparing with the liquid plastic limit, strength and water stability of cement and lime, the strength of sulfur fixation slag to red clay is studied. The effect of deformable base water stability on red clay was compared with that of different modified materials, and the modification law was obtained. The microscopic mechanism of sulfur fixation ash modified red clay was studied. The structure of red clay was changed by adding sulfur ash into red clay, and a new cementitious substance was formed by the reaction of fixed sulfur ash with red clay. Tight cementation. Red clay has a large number of micropore structures and large fineness of sulfur fixation ash, which can not only fill the pore structure but also form a whole. The sulfur fixing ash absorbs a large amount of water in the process of hydration to form a combined water. Moreover, it has expansibility and reduces the shrinkage and deformation caused by water loss.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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