本文選題：鐵尾礦 + 路面基層材料　； 參考：《中南大學》2014年碩士論文

【摘要】：本文系統(tǒng)的研究了鐵尾礦用作路面基層材料這一課題,為鐵尾礦的綜合利用提供了一條新的途徑。 本文首先進行了鐵尾礦用作路面基層材料的配合比進行了實驗論證,添加了水泥、生物凝聚酶作為鐵尾礦的穩(wěn)定劑,根據(jù)國標要求采用無側(cè)限抗壓強度作為唯一評價指標,確定了集合料的最佳配合比為水泥：碎石：鐵尾礦：生物凝聚酶=5：30：68：2。在此配合比時,鐵尾礦做路面基層材料的強度可以滿足國標規(guī)定的高速公路及一級公路道路使用標準。 為了提高路面材料的使用壽命、優(yōu)化材料性能,在無機結(jié)合料中加入聚丙烯纖維,并重點針對路面材料力學性能以及耐久性能展開研究。實驗結(jié)果表明：試件的劈裂抗拉強度隨聚丙烯纖維的加入先上升后下降,當纖維摻量為1.5kg/3時,試件的劈裂抗拉強度最大；試件的抗彎拉強度隨聚丙烯纖維的加入先上升后下降,當纖維摻量為0.9kg/3時,試件的抗彎拉強度最大；聚丙烯纖維的摻入有助于降低試件的回彈模量值,回彈模量隨聚丙烯纖維用量增加而增大；不同聚丙烯纖維的摻量對試件的凍穩(wěn)性影響很�。徊煌郾├w維的摻量對試件水穩(wěn)性影響較��；抗沖刷實驗表明,試件的質(zhì)量損失比隨著纖維摻量的增加沖刷率與質(zhì)量損失比先下降后上升,當纖維摻量為1.5kg/m3時,試件的沖刷率降至最低；纖維的摻入可有效降低試件的干縮量；綜合上述試驗結(jié)果,最終確定聚丙烯纖維的最佳用量為1.5kg/3。 本文的研究成果對推廣鐵尾礦用作路面基層材料具有一定的參考價值。圖24幅,表22個,參考文獻66篇。
[Abstract]:In this paper, the problem of iron tailings as pavement base material is systematically studied, which provides a new way for the comprehensive utilization of iron tailings. In this paper, the mixture ratio of iron tailings used as pavement base material is demonstrated experimentally. Cement, bio-coagulase is added as stabilizer of iron tailings, and the unconfined compressive strength is used as the sole evaluation index according to the requirements of national standard. The optimum mixture ratio of aggregate material is cement: crushed stone: iron tailings: biocerulase 5: 30: 68: 2. In this mix ratio, the strength of iron tailings as pavement base material can meet the national standard for the use of expressway and first-class highway. In order to improve the service life and optimize the properties of pavement materials, polypropylene fiber was added into inorganic binders, and the mechanical properties and durability of pavement materials were studied. The experimental results show that the splitting tensile strength of the specimen increases first and then decreases with the addition of polypropylene fiber. When the fiber content is 1.5kg/ 3, the splitting tensile strength of the specimen is the largest, and the flexural tensile strength of the specimen increases first and then decreases with the addition of polypropylene fiber. When the fiber content is 0.9kg/ 3, the flexural tensile strength of the specimen is the largest, and the addition of polypropylene fiber helps to reduce the elastic modulus of the specimen, and the elastic modulus increases with the increase of the content of polypropylene fiber. The effect of different content of polypropylene fiber on the freezing stability of the specimen is very small, and the content of different polypropylene fiber has little effect on the water stability of the specimen, and the scour resistance experiment shows that the different content of polypropylene fiber has little effect on the water stability of the specimen. With the increase of fiber content, the ratio of scour loss to mass loss decreases first and then goes up. When the fiber content is 1.5kg/m3, the scouring rate of the specimen decreases to the minimum, and the dry shrinkage of the specimen can be effectively reduced by the addition of fiber. According to the above experimental results, the optimum dosage of polypropylene fiber was determined to be 1.5 kg / 3. The research results of this paper have certain reference value for popularizing iron tailings as pavement base material. There are 24 figures, 22 tables and 66 references.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U414

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本文編號：1846099