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】：粒化高爐礦渣粉(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的無側(cè)限抗壓強(qiáng)度。但目前對GGBS-MgO作為重金屬污染粘土固化劑研究存在不足,本文以國家863計劃課題(2013AA06A206)、國家自然科學(xué)基金重點項目(41330641)、國家自然科學(xué)基金項目(51278100,41472258)和江蘇省自然科學(xué)基金杰出青年基金項目(BK2012022)為依托,采用GGBS-MgO作為固化劑加固鉛污染粘土,并通過酸緩沖能力測試、無側(cè)限抗壓強(qiáng)度試驗、毒性浸出試驗及半動態(tài)浸出試驗,對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GGBS-MgO和水泥固化現(xiàn)場鉛鋅鎘復(fù)合污染土進(jìn)行對比研究。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,半動態(tài)浸出試驗后,同一配比試樣內(nèi)部pH在淋濾液初始pH=2.0-7.0時相差不大,而試樣表層pH在淋濾液初始pH=2.0時約為pH=3.0-7.0時的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;半動態(tài)浸出試驗后,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試驗表明隨著固化劑摻量的增加,鉛溶出率明顯下降；半動態(tài)浸出試驗表明同等摻量、同等試驗條件下,淋濾液初始pH=7.0時,GGBS-MgO固化土擴(kuò)散系數(shù)相比于水泥固化土低1-2個數(shù)量級；通過三種方法計算擴(kuò)散系數(shù),初始淋濾液pH=2.0時鉛的溶出機(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。通過上述試驗研究表明,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)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X53;TU43

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