本文關(guān)鍵詞： 濱海鹽漬土 抗壓強(qiáng)度 水穩(wěn)性 耐久性　出處：《北京科技大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：濱海鹽漬土中含有大量可溶性鹽,使鹽漬土具有鹽脹性、溶陷性、腐蝕性、吸濕軟化性等工程特性。濱海地區(qū)的工程建設(shè)都涉及對(duì)其進(jìn)行固化利用的問題。由于以往固化方法處理費(fèi)用高、固化效果差等諸多方面的缺陷,因此迫切需要新型固化劑,以確保工程安全和投資合理。 在對(duì)曹妃甸濱海鹽漬土和礦渣料宏細(xì)觀結(jié)構(gòu)特征、化學(xué)性能進(jìn)行綜合分析的基礎(chǔ)上,提出利用礦渣復(fù)合固化劑進(jìn)行鹽漬土固化的技術(shù)思路,并確定出礦渣復(fù)合固化劑的性能要求。通過抗壓強(qiáng)度試驗(yàn)、水穩(wěn)性試驗(yàn)、可溶性離子含量測(cè)定試驗(yàn)、SEM分析試驗(yàn)、EDS能譜分析試驗(yàn)和XRD分析試驗(yàn),測(cè)試了礦渣復(fù)合固化劑固化鹽漬土(固化土)的無側(cè)限抗壓強(qiáng)度、水穩(wěn)性、可溶性離子含量,耐久性,溶陷性和鹽脹性,觀察了固化土的微觀形貌,分析了固化土水化產(chǎn)物的組成,探討了礦渣復(fù)合固化劑對(duì)鹽漬土的固化機(jī)理。結(jié)果表明：與水泥土相比,礦渣復(fù)合固化劑固化土的無側(cè)限抗壓強(qiáng)度較大,水穩(wěn)性較強(qiáng),耐久性好,抗溶陷性強(qiáng),抗鹽脹性強(qiáng),能滿足一般工程地基固化處理的要求。由于鹽漬土中可溶性Cl-、SO42-和Na+參與了礦渣復(fù)合固化劑的水化反應(yīng),并生成了新的水化產(chǎn)物片狀晶體和針棒狀晶體(3CaO·Al2O3·(0.5CaCl2·0.5CaSO4)·12H2O),副產(chǎn)品NaOH為礦渣提供了更強(qiáng)的堿性環(huán)境,并生成了沸石類物質(zhì)(0.8CaO·0.2Na2O·Al2O3·3SiO2·6H2O),因此固化土可溶性Cl-、SO42-和Na+含量較低。濱海鹽漬土通過礦渣復(fù)合固化劑的三級(jí)固化作用,使固化土無側(cè)限抗壓強(qiáng)度較大,水穩(wěn)性較強(qiáng),抗溶陷性強(qiáng),抗鹽脹性強(qiáng),解決了鹽漬土的一些潛在危害。 礦渣復(fù)合固化劑固化土在海水中會(huì)生成的致密堅(jiān)硬的CaCO3外殼,隨著齡期的增長(zhǎng),該外殼越來越厚。CaCO3晶體在海水中會(huì)穩(wěn)定存在,不會(huì)與海水中的其它離子發(fā)生化學(xué)反應(yīng),從而阻止了海水對(duì)試塊內(nèi)部的侵蝕,也阻止了Ca(OH)2的溶出型侵蝕,這可能是礦渣復(fù)合固化劑具有良好抗海水侵蝕性能的根本原因。 礦渣復(fù)合固化劑的最優(yōu)配比為：礦渣75%,生石灰7.5%,石膏7.5%,菱苦土10%。其主要組分是礦渣,成本為水泥的60%-70%,是一種綠色環(huán)保型固化劑。
[Abstract]:The seaside saline soil contains a large amount of soluble salt, which makes the saline soil have salt expansion, solution and corrosion. Engineering characteristics such as moisture absorption and softening. Engineering construction in coastal area involves the problem of curing and utilizing it. Due to the shortcomings of the former curing methods, such as high cost and poor curing effect, new curing agents are urgently needed. To ensure project safety and reasonable investment. Based on the comprehensive analysis of macrostructural characteristics and chemical properties of salinized soil and slag in Caofeidian, the technical idea of solidifying salinized soil by using compound solidifying agent of slag is put forward. The performance requirements of slag compound hardener were determined. Through compressive strength test, water stability test, soluble ion content determination test, SEM analysis test, EDS energy spectrum analysis test and XRD analysis test, The unconfined compressive strength, water stability, soluble ion content, durability, solubility and salt swelling of solidified saline soil with slag compound curing agent were tested, and the microstructure of solidified soil was observed. The composition of hydration products of solidified soil was analyzed, and the mechanism of solidification of salinized soil by slag compound curing agent was discussed. The results showed that compared with cement soil, the unconfined compressive strength and water stability of solidified soil with slag compound curing agent were higher than that of cement soil. It has good durability, strong resistance to solution, strong resistance to salt dilatancy, and can meet the requirements of general engineering foundation curing treatment. Because soluble Cl-so _ 42- and Na in saline soil participate in the hydration reaction of slag compound curing agent, A new hydration product, flake crystal and needle rod crystal, 3CaO 路Al2O3 路N0.5CaCl2 路0.5CaSO4) 路12H2O were formed. The by-product NaOH provided a stronger alkaline environment for slag. A zeolite material of 0.8CaO 路0.2Na _ 2O 路Al2O3 路3SiO _ 2 路6H _ 2O was formed, so the content of soluble Cl-so _ 4- and Na in solidified soil was lower. The third-stage solidification of seashore saline soil through slag compound curing agent made the unconfined compressive strength, water stability and solution resistance of solidified soil higher. The salt swelling resistance is strong, which solves some potential hazards of salinized soil. The dense and hard CaCO3 shell formed by slag composite curing agent solidified soil in seawater. With the increase of age, the shell thicker and thicker. CaCO3 crystals will exist stably in seawater and will not react with other ions in seawater. Thus, the erosion of seawater to the inner part of the specimen and the dissolution of Ca(OH)2 were prevented, which may be the fundamental reason that the slag compound curing agent has good resistance to seawater erosion. The optimum ratio of slag compound curing agent is as follows: slag 75, quicklime 7.5, gypsum 7.5, rhombic soil 10. The main component is slag, the cost is 60-70 of cement, it is a kind of green environmental protection curing agent.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU448

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