【摘要】：由于建筑垃圾再生骨料成分復(fù)雜，含有大量水泥砂漿等雜質(zhì)，表面微裂縫和微孔隙充分發(fā)育，導(dǎo)致強(qiáng)度偏低、孔隙率大、吸水率高、密度小，只能配制中低強(qiáng)度的低等級(jí)水泥混凝土，，難以用在瀝青混合料中。本文通過對(duì)再生骨料強(qiáng)化處理，提高其性能，并驗(yàn)證再生粗骨料在瀝青穩(wěn)定碎石中應(yīng)用的可行性。 本文通過檢測(cè)建筑垃圾再生骨料的壓碎值、磨耗值、吸水率、毛體積密度、表觀密度等基本性能指標(biāo)，分析再生骨料與天然骨料之間的主要性質(zhì)差別，確定再生骨料用于瀝青混合料的主要關(guān)鍵技術(shù)難點(diǎn)。選擇水玻璃（Na2SiO4）、有機(jī)硅樹脂以及硅烷偶聯(lián)劑三種溶液對(duì)再生骨料進(jìn)行強(qiáng)化處理：設(shè)計(jì)正交試驗(yàn)確定水玻璃處理再生骨料的最佳濃度、溫度等試驗(yàn)條件；用不同用量和不同水油比（水與有機(jī)硅樹脂的比例）的有機(jī)硅樹脂，確定其最佳處理參數(shù)；用硅烷偶聯(lián)劑對(duì)再生骨料進(jìn)行處理，檢測(cè)其對(duì)再生骨料粘附性和物理性指標(biāo)的處理效果。基于SEM微觀電鏡掃描分析，分析各種樣本的裂縫、結(jié)構(gòu)致密性等。結(jié)果表明有機(jī)硅樹脂對(duì)再生骨料的處理效果最好，其強(qiáng)度、吸水率和粘附性都最為顯著。 由于建筑垃圾再生骨料孔隙率大，吸水率高的特殊性，在配合比設(shè)計(jì)中與天然骨料具有很大的差異，本文通過研究建筑垃圾再生骨料與天然骨料在瀝青穩(wěn)定碎石配合比設(shè)計(jì)中的差異，提出關(guān)鍵參數(shù)理論最大相對(duì)密度確定方法。通過試驗(yàn)證明再生骨料的理論最大相對(duì)密度實(shí)測(cè)值要大于計(jì)算值，這和一般天然骨料試驗(yàn)結(jié)果規(guī)律不同。 選擇有機(jī)硅樹脂處理后的再生骨料和未處理的再生骨料做配合比設(shè)計(jì)及路用性能對(duì)比分析，驗(yàn)證強(qiáng)化處理的效果和設(shè)計(jì)方法的可行性。
[Abstract]:As a result of the complex composition of recycled aggregate of construction waste, containing a large number of impurities such as cement mortar, the surface micro-cracks and micro-pores are fully developed, resulting in low strength, high porosity, high water absorption and low density. Low-grade cement concrete with low strength can only be formulated, which is difficult to be used in asphalt mixture. In this paper, the performance of recycled aggregate is improved by strengthening the recycled aggregate, and the feasibility of using recycled coarse aggregate in asphalt stabilized macadam is verified. In this paper, the main property differences between recycled aggregate and natural aggregate are analyzed by testing the basic properties of recycled aggregate, such as crushing value, wear value, water absorption, gross volume density, apparent density, etc. The key technical difficulties of using recycled aggregate in asphalt mixture are determined. Three solutions of water glass (Na2SiO4), silicone resin and silane coupling agent were selected to strengthen the recycled aggregate. The orthogonal test was designed to determine the optimum concentration and temperature of the recycled aggregate treated with water glass. The optimum treatment parameters of silicone resin with different dosage and water-oil ratio (the ratio of water to silicone resin) were determined. Silane coupling agent was used to treat recycled aggregate, and its treatment effect on adhesion and physical index of recycled aggregate was tested. Based on the scanning analysis of SEM microscopic electron microscope, the cracks and structure compactness of various samples were analyzed. The results showed that silicone resin had the best effect on the treatment of recycled aggregate, and its strength, water absorption and adhesion were the most significant. Because of the particularity of large porosity and high water absorption rate of recycled aggregate in building waste, there is great difference between natural aggregate and mix ratio design. In this paper, the difference between recycled aggregate and natural aggregate in asphalt stabilized macadam mixture design is studied, and the method of determining the maximum relative density of key parameter theory is put forward. The experimental results show that the theoretical maximum relative density of recycled aggregate is larger than the calculated value, which is different from the experimental results of natural aggregate. Selection of recycled aggregate treated with silicone resin and untreated recycled aggregate as mixture design and comparative analysis of road performance to verify the effectiveness of strengthening treatment and the feasibility of the design method.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：X799.1;U414

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