本文選題：污染土　切入點(diǎn)：氯化鎂　出處：《巖土工程學(xué)報(bào)》2014年06期 　論文類型：期刊論文

【摘要】：通過水泥加固不同含量的氯化鎂污染土室內(nèi)28 d抗壓強(qiáng)度、X射線衍射(XRD)和微觀掃描電鏡試驗(yàn)(SEM),研究了氯化鎂對(duì)水泥土的早期強(qiáng)度影響機(jī)理。XRD分析結(jié)果表明:氯化鎂參與反應(yīng)生成的M-S-H、M-A-H、氯化鈣結(jié)晶、輕質(zhì)氯化鎂結(jié)晶和水化氯鋁酸鈣等產(chǎn)物對(duì)水泥土產(chǎn)生分解與結(jié)晶的復(fù)合作用;SEM圖象分析表明:氯化鎂使水泥土的孔徑分布發(fā)生改變,當(dāng)氯化鎂含量較低時(shí),水泥土中的水泥水化產(chǎn)物與結(jié)晶物將顆粒連結(jié)在一起,形成較強(qiáng)的結(jié)構(gòu)聯(lián)結(jié),使其孔隙率變小,對(duì)水泥土的強(qiáng)度增長(zhǎng)有利;隨著氯化鎂含量增大,土顆粒周圍的凝膠物被分解,使水泥土的孔隙率增大與膠結(jié)程度下降,對(duì)水泥土的強(qiáng)度不利。
[Abstract]:The influence mechanism of magnesium chloride on the early strength of cement contaminated soil was studied by using cement to reinforce different content of magnesium chloride contaminated soil in room for 28 days by X-ray diffraction (XRD) and microscopic scanning electron microscopy (SEM). The results showed that: (1) the effect of magnesium chloride on the early strength of cement soil. The formation of M-S-HfU M-A-H in which magnesium participates in the reaction, and the crystallization of calcium chloride, SEM Image Analysis of decomposition and Crystallization of cement soil by products such as Light magnesium Chloride Crystallization and calcium Chloride Hydrate. The SEM image analysis shows that magnesium chloride changes the pore size distribution of cement soil, and when the content of magnesium chloride is low, the pore size distribution of cement soil is changed when the content of magnesium chloride is low. The hydration products of cement and crystal in cement soil combine the particles together to form a strong structural connection, which makes the porosity become smaller, which is beneficial to the strength growth of the cement soil. With the increase of magnesium chloride content, the gel material around the soil particle is decomposed. The porosity of cement soil is increased and the cementation degree is decreased, which is unfavorable to the strength of cement soil.
【作者單位】： 太原理工大學(xué)建筑與土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51208333,51078253) 高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金項(xiàng)目(20111402120001)
【分類號(hào)】：TU472.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 于小軍;;水泥土芯樣的微觀結(jié)構(gòu)特征研究[J];四川建筑科學(xué)研究;2010年05期

2 馬冬梅;;可溶鹽對(duì)水泥土強(qiáng)度影響的微觀分析[J];公路交通科技;2008年04期

3 邢皓楓;徐超;葉觀寶;楊曉明;;水泥加固高含鹽軟土的強(qiáng)度和微觀結(jié)構(gòu)研究[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);2008年12期

4 黃雨;周子舟;柏炯;陳企奮;;水泥土攪拌法加固沖填土軟土地基的微觀試驗(yàn)[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年07期

5 寧寶寬,陳四利,劉斌;水泥土的環(huán)境侵蝕效應(yīng)與破裂過程分析[J];巖石力學(xué)與工程學(xué)報(bào);2005年10期

6 楊俊杰;孫濤;張sュ，

本文編號(hào)：1644419