本文關(guān)鍵詞： 鉛污染 GGBS-MgO 穩(wěn)定/固化 物理化學(xué)性 強(qiáng)度特性 環(huán)境安全性 微觀機(jī)理　出處：《東南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：�；郀t礦渣粉(GGBS)作為一種綠色低碳可持續(xù)發(fā)展材料,被廣泛作為水泥基材料添加料。活性氧化鎂(MgO)可以有效激發(fā)GGBS,提高激發(fā)后GGBS的無(wú)側(cè)限抗壓強(qiáng)度。但目前對(duì)GGBS-MgO作為重金屬污染粘土固化劑研究存在不足,本文以國(guó)家863計(jì)劃課題(2013AA06A206)、國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(41330641)、國(guó)家自然科學(xué)基金項(xiàng)目(51278100,41472258)和江蘇省自然科學(xué)基金杰出青年基金項(xiàng)目(BK2012022)為依托,采用GGBS-MgO作為固化劑加固鉛污染粘土,并通過(guò)酸緩沖能力測(cè)試、無(wú)側(cè)限抗壓強(qiáng)度試驗(yàn)、毒性浸出試驗(yàn)及半動(dòng)態(tài)浸出試驗(yàn),對(duì)GGBS-MgO固化鉛污染土進(jìn)行物理化學(xué)特性、強(qiáng)度特性、環(huán)境安全性及微觀機(jī)理的分析研究,并對(duì)GGBS-MgO和水泥固化現(xiàn)場(chǎng)鉛鋅鎘復(fù)合污染土進(jìn)行對(duì)比研究。得到的主要研究結(jié)論如下：(1)物理化學(xué)特性：標(biāo)準(zhǔn)養(yǎng)護(hù)及半動(dòng)態(tài)浸出條件下,GGBS-MgO固化鉛污染土pH均低于固化未污染土,半動(dòng)態(tài)浸出試驗(yàn)后,同一配比試樣內(nèi)部pH在淋濾液初始pH=2.0-7.0時(shí)相差不大,而試樣表層pH在淋濾液初始pH=2.0時(shí)約為pH=3.0-7.0時(shí)的1/2; GGBS-MgO固化鉛污染土相比于水泥固化鉛污染土有較強(qiáng)的酸緩沖能力。(2)強(qiáng)度特性：GGBS-MgO固化鉛污染土針刺深度約為固化未污染土的1.4-3.2倍,且無(wú)側(cè)限抗壓強(qiáng)度qu均較固化未污染土小；隨著固化劑摻量增加,試樣針刺深度逐漸減小,強(qiáng)度隨之升高;半動(dòng)態(tài)浸出試驗(yàn)后,試樣隨著淋濾液初始pH增大,試樣針刺深度逐漸減小,qu增加,試樣qu較標(biāo)準(zhǔn)養(yǎng)護(hù)39 d試樣qu降低了2%-53%；在同等條件下GGBS-MgO固化未污染土半動(dòng)態(tài)浸出后qu較水泥固化未污染土qu提高了12%-43%,且在18%摻量下約為水泥固化鉛污染土1.3-1.8倍。(3)環(huán)境安全性：TCLP試驗(yàn)表明隨著固化劑摻量的增加,鉛溶出率明顯下降；半動(dòng)態(tài)浸出試驗(yàn)表明同等摻量、同等試驗(yàn)條件下,淋濾液初始pH=7.0時(shí),GGBS-MgO固化土擴(kuò)散系數(shù)相比于水泥固化土低1-2個(gè)數(shù)量級(jí)；通過(guò)三種方法計(jì)算擴(kuò)散系數(shù),初始淋濾液pH=2.0時(shí)鉛的溶出機(jī)制為溶解,隨著pH增加溶出機(jī)制由溶解轉(zhuǎn)為擴(kuò)散。(4)微觀機(jī)理：X射線衍射結(jié)果表明GGBS-MgO固化鉛污染土有明顯水合硅酸鎂和Ht生成,鉛的固定形式主要為表面吸附與沉淀；掃描電鏡結(jié)果表明,GGBS-MgO固化土試樣標(biāo)準(zhǔn)養(yǎng)護(hù)28 d時(shí)主要水化產(chǎn)物為C-S-H與Ht,鉛污染的摻入使C-S-H與Ht在形態(tài)上有所改變；壓汞試驗(yàn)結(jié)果表明,隨著齡期增加,試樣累積孔隙減少：固化劑摻量增加會(huì)使試樣內(nèi)部孔隙更加致密,鉛污染的摻入使得試樣孔隙增加：半動(dòng)態(tài)浸出結(jié)束后,試樣孔徑相比于同齡期試樣增大,GGBS-MgO固化士孔隙比水泥固化土更為致密。通過(guò)上述試驗(yàn)研究表明,GGBS-MgO作為固化劑固化鉛污染粘土在強(qiáng)度特性、環(huán)境安全性上都優(yōu)于水泥,可將其作為固化劑代替水泥固化鉛污染粘土。
[Abstract]:Granulated blast furnace slag powder (GGBS) is a green and low carbon material for sustainable development. Active magnesium oxide (MgO) can effectively excite GGBs and improve the unconfined compressive strength of activated GGBS. However, the study of GGBS-MgO as a curing agent for heavy metal contaminated clay is insufficient. In this paper, based on the National 863 Program project (2013AA06A206), the National Natural Science Foundation's key project (41330641U), the National Natural Science Foundation's project No. 51278100 (41472258) and the outstanding youth fund of Jiangsu Provincial Natural Science Foundation (BK2012022), GGBS-MgO is used as the curing agent to strengthen lead-contaminated clay. Through acid buffer capacity test, unconfined compressive strength test, toxic leaching test and semi-dynamic leaching test, the physical and chemical properties, strength characteristics, environmental safety and microscopic mechanism of GGBS-MgO solidified lead-contaminated soil were analyzed and studied. The main conclusions are as follows: the physical and chemical properties of Pb-Zn / CD composite contaminated soil cured by GGBS-MgO and cement curing site are as follows: the pH of GGBS-MgO solidified lead-contaminated soil is lower than that of solidified uncontaminated soil under standard curing and semi-dynamic leaching conditions. After semi-dynamic leaching test, the internal pH of the same ratio sample had little difference at the initial pH=2.0-7.0 of the leachate. The pH value of the surface layer of the sample was about 1 / 2 of that of pH=3.0-7.0 at the initial pH=2.0 of leaching solution, and the strength of the lead-contaminated soil cured by GGBS-MgO was 1.4-3.2 times of that of the uncontaminated soil, compared with that of the lead-contaminated soil solidified by cement. The strength characteristics of the lead-contaminated soil solidified with GGBS-MgO were 1.4-3.2 times as deep as that of the uncontaminated soil cured by GGBS-MgO. The unconfined compressive strength qu is smaller than that of the uncontaminated soil, the depth of needling decreases gradually and the strength increases with the increase of the content of curing agent, after semi-dynamic leaching, the sample increases with the initial pH of leaching solution. The needling depth of the sample gradually decreased and increased. After semi-dynamic leaching of uncontaminated soil cured by GGBS-MgO under the same conditions, it increased 12-43x than that of uncontaminated soil cured by cement, and was about 1.3-1.8 times as much as that of cement-cured lead-contaminated soil at 18%). The environmental safety: TCLP test showed that with the increase of the amount of curing agent, The semi-dynamic leaching test showed that the diffusion coefficient of GGBS-MgO solidified soil was 1-2 orders of magnitude lower than that of cement solidified soil at the initial pH=7.0 of leaching filtrate under the same amount of content, and the diffusion coefficient was calculated by three methods. The dissolution mechanism of lead in the initial leaching filtrate pH=2.0 was dissolution. With the increase of pH, the dissolution mechanism changed from dissolution to diffusion. The microcosmic X-ray diffraction results showed that GGBS-MgO solidified lead contaminated soil had obvious hydrated magnesium silicate and Ht formation. The results of SEM showed that the main hydration products of GGBS-MgO solidified soil for 28 days were C-S-H and Ht.The incorporation of lead pollution changed the morphology of C-S-H and Ht. With the increase of age, the cumulative porosity of the sample decreases: the increase of the amount of curing agent will make the internal pore of the sample more compact, and the incorporation of lead pollution will increase the pore of the sample: after the semi-dynamic leaching, The pore size of GGBS-MgO solidified clay is denser than that of cement solidified soil. The experimental results show that GGBS-MgO solidified lead-contaminated clay is superior to cement in terms of strength and environmental safety. It can be used as curing agent instead of cement curing lead contaminated clay.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X53;TU43

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 馬衍富;試論高強(qiáng)度厚帶和繩索的強(qiáng)度試驗(yàn)[J];紡織特品技術(shù);1984年03期

2 康啟來(lái);;電子壓縮強(qiáng)度試驗(yàn)儀的使用和檢測(cè)體會(huì)[J];印刷世界;2009年03期

3 ;碳素刮片動(dòng)態(tài)強(qiáng)度試驗(yàn)[J];電碳技術(shù);1975年04期

4 ;大口徑的90°彎頭強(qiáng)度試驗(yàn)研究[J];華東石油學(xué)院學(xué)報(bào);1977年02期

5 ;焊接薄壁三通的強(qiáng)度試驗(yàn) 四、分析[J];油田設(shè)計(jì);1972年03期

6 郝克耕;韓春雷;邱平;;直拔法檢測(cè)混凝土強(qiáng)度試驗(yàn)研究[J];建筑科學(xué);2012年03期

7 郝俊芳;; 油田管類復(fù)合外載強(qiáng)度試驗(yàn)裝置[J];石油礦場(chǎng)機(jī)械;1981年03期

8 彭?yè)?dān)任;彭超;;礦用風(fēng)筒材料撕力強(qiáng)度試驗(yàn)技術(shù)[J];試驗(yàn)技術(shù)與試驗(yàn)機(jī);2003年04期

9 杜躍武, 曾憲煊，孫永振，，肖恩與，孫國(guó)堂;磁化水拌制砼試驗(yàn)研究[J];焦作礦業(yè)學(xué)院學(xué)報(bào);1995年03期

10 曾月秀;;運(yùn)用質(zhì)量專業(yè)理論 判斷水泥產(chǎn)品富裕強(qiáng)度合格率[J];中國(guó)水泥;2006年05期

相關(guān)會(huì)議論文 前5條

1 郭玉濤;吳佩剛;趙光儀;;二軸應(yīng)力下高強(qiáng)混凝土的強(qiáng)度[A];高強(qiáng)混凝土及其應(yīng)用第二屆學(xué)術(shù)討論會(huì)論文集[C];1995年

2 暢雄勃;;后置雙柱防翻架強(qiáng)度試驗(yàn)分析及設(shè)計(jì)要點(diǎn)[A];農(nóng)業(yè)機(jī)械化與全面建設(shè)小康社會(huì)——中國(guó)農(nóng)業(yè)機(jī)械學(xué)會(huì)成立40周年慶典暨2003年學(xué)術(shù)年會(huì)論文集[C];2003年

3 談云志;喻波;鄭愛(ài);付偉;張華;萬(wàn)智;;石灰穩(wěn)定紅黏土強(qiáng)度的長(zhǎng)期碳化效應(yīng)[A];《巖土力學(xué)》vol.34 增刊1 2013[C];2013年

4 周孝正;蔡正詠;;射釘法檢測(cè)混凝土強(qiáng)度試驗(yàn)研究[A];混凝土工程質(zhì)量控制適用技術(shù)交流會(huì)論文匯編[C];1991年

5 任鐵鉞;魏瑩;;利用均勻設(shè)計(jì)方法對(duì)多元膠凝體系強(qiáng)度的研究[A];全國(guó)高性能混凝土和礦物摻合料的研究與工程應(yīng)用技術(shù)交流會(huì)論文集[C];2006年

相關(guān)重要報(bào)紙文章 前3條

1 王立群;C919首件大部段開(kāi)始強(qiáng)度試驗(yàn)[N];中國(guó)航空?qǐng)?bào);2011年

2 范有祿 尚忠弟;中國(guó)飛機(jī)強(qiáng)度試驗(yàn)的尖兵[N];中國(guó)航空?qǐng)?bào);2003年

3 劉紅斌　關(guān)祥武　王冬;當(dāng)好質(zhì)量“守護(hù)神”[N];解放軍報(bào);2002年

相關(guān)博士學(xué)位論文 前2條

1 馮建民;計(jì)算機(jī)輔助強(qiáng)度試驗(yàn)系統(tǒng)研究[D];西北工業(yè)大學(xué);2002年

2 孟憲宏;混凝土疲勞剩余強(qiáng)度試驗(yàn)及理論研究[D];大連理工大學(xué);2006年

相關(guān)碩士學(xué)位論文 前8條

1 陳誠(chéng);高強(qiáng)度汽車(chē)用懸架彈簧盤(pán)條的研發(fā)[D];復(fù)旦大學(xué);2013年

2 薄煜琳;粒化高爐礦渣和氧化鎂固化穩(wěn)定化鉛污染粘土的強(qiáng)度、溶出及微觀特性的研究[D];東南大學(xué);2015年

3 陸明;座椅安全帶固定點(diǎn)強(qiáng)度試驗(yàn)臺(tái)研制[D];大連理工大學(xué);2012年

4 韓東亮;鉆井平臺(tái)高壓管線強(qiáng)度試驗(yàn)安全性研究[D];哈爾濱工程大學(xué);2011年

5 馬傳亮;利用灰色理論進(jìn)行混凝土強(qiáng)度早期快速推定的研究與應(yīng)用[D];重慶大學(xué);2013年

6 劉天寶;高強(qiáng)度鋁蜂窩自動(dòng)化組裝工藝及設(shè)備的研究[D];重慶理工大學(xué);2013年

7 劉洋;基于全計(jì)算法配制C100高強(qiáng)混凝土強(qiáng)度、工作性研究[D];重慶交通大學(xué);2014年

8 高原;混凝土動(dòng)力強(qiáng)度與靜力強(qiáng)度的關(guān)系探討[D];清華大學(xué);2008年

本文編號(hào)：1536033