本文選題：礦渣 + 復(fù)合膠凝材料�。� 參考：《清華大學(xué)》2013年博士論文

【摘要】：礦渣作為一種輔助性膠凝材料，大量用于配制混凝土。這可以綜合利用工業(yè)廢渣，減少水泥用量，，具有較好的環(huán)境效應(yīng)和經(jīng)濟(jì)效應(yīng)。為了保證用其配制的混凝土的耐久性，水泥 礦渣復(fù)合膠凝材料漿體在服役環(huán)境中的長(zhǎng)期性能值得關(guān)注。本文對(duì)水泥 礦渣復(fù)合膠凝材料的水化機(jī)理和長(zhǎng)期性能進(jìn)行了研究，主要研究?jī)?nèi)容和相關(guān)結(jié)論如下： (1)水泥 礦渣復(fù)合膠凝材料在常溫養(yǎng)護(hù)下，礦渣早期反應(yīng)速率慢，后期反應(yīng)程度提高較多；礦渣摻量不大于70%時(shí)，摻量對(duì)其反應(yīng)程度影響不大，水泥 礦渣復(fù)合膠凝料硬化漿體孔溶液pH值達(dá)到12.6以上時(shí)，可較好地激發(fā)礦渣的活性；水泥 礦渣復(fù)合膠凝材料的總反應(yīng)程度低于純水泥；高溫養(yǎng)護(hù)能較好地激發(fā)早期礦渣的活性，使礦渣早期的反應(yīng)程度提高，但后期沒(méi)有進(jìn)一步提升礦渣的反應(yīng)程度；化學(xué)結(jié)合水量法不能準(zhǔn)確地表征水泥 礦渣復(fù)合膠凝材料的反應(yīng)程度。 (2)礦渣早期的水化反應(yīng)會(huì)消耗Ca(OH)2。在其活性被激發(fā)后，水化后期不再消耗較多Ca(OH)2，水泥 礦渣復(fù)合膠凝漿體中的Ca(OH)2含量較低；常溫養(yǎng)護(hù)下早期水泥 礦渣復(fù)合膠凝材料硬化漿體的微觀結(jié)構(gòu)較為疏松，后期明顯改善，孔隙結(jié)構(gòu)優(yōu)化；早期高溫養(yǎng)護(hù)使復(fù)合膠凝材料漿體微觀結(jié)構(gòu)得到顯著改善；水泥 礦渣復(fù)合膠凝材料中C S H凝膠的Ca/Si比較低，礦渣反應(yīng)生成的低Ca/Si比的C S H凝膠呈箔片狀，代替水泥水化生成的纖維狀C S H凝膠，能更有效地填充孔隙。 (3)礦渣水化反應(yīng)主要生成微觀力學(xué)性能高的HD C S H凝膠，凝膠的微觀力學(xué)性能與其堆積密實(shí)度相關(guān)，與其化學(xué)組成無(wú)關(guān)。礦渣反應(yīng)生成含Al的C A S H凝膠，且Al在橋四面體位置替代Si；隨著齡期的延長(zhǎng)，凝膠的平均直鏈長(zhǎng)度增加，隨著礦渣摻量的增加，C A S H凝膠的平均硅鋁鏈長(zhǎng)度增大，Al/Si比增加。 (4)水泥 礦渣復(fù)合膠凝材料硬化漿體遭受長(zhǎng)期軟水溶蝕后，Ca(OH)2含量仍充足，C S H凝膠的Ca/Si比稍有降低，但沒(méi)有分解的跡象。水泥 礦渣復(fù)合膠凝材料硬化漿體的孔隙率更低，表現(xiàn)出更好的抗溶蝕性。用水泥 礦渣復(fù)合膠凝材料制備的混凝土中，Ca(OH)2含量降低，碳化深度較大，但滿(mǎn)足長(zhǎng)期穩(wěn)定性的要求。 (5)礦渣摻量不超過(guò)70%時(shí)，水泥 礦渣復(fù)合膠凝材料硬化漿體具有更加密實(shí)的微觀結(jié)構(gòu)，漿體中Ca(OH)2含量的適量減少和孔溶液堿度的降低，沒(méi)有影響復(fù)合膠凝材料漿體微觀結(jié)構(gòu)的長(zhǎng)期穩(wěn)定性。
[Abstract]:As an auxiliary cementitious material, slag is widely used in the preparation of concrete. It can make comprehensive use of industrial waste slag, reduce cement consumption, and have better environmental and economic effects. In order to ensure the durability of concrete prepared with it, the long-term performance of cement and slag composite cement paste in service environment is worthy of attention. In this paper, the hydration mechanism and long-term performance of cement-slag composite cementing materials are studied. The main research contents and relevant conclusions are as follows: (1) Cement-slag composite cementing materials are cured at room temperature. The reaction rate of slag is slow in early stage and the reaction degree in later stage is much higher. When the slag content is less than 70, the effect of slag content on the reaction degree is not significant. When the pH value of cement / slag composite cement hardened slurry pore solution reaches more than 12.6, It can excite the activity of slag better, the total reaction degree of cement-slag composite cementitious material is lower than that of pure cement, the activity of early slag can be better stimulated by high temperature curing, and the early reaction degree of slag can be improved. However, the reaction degree of slag was not further improved in the later stage, and the reaction degree of cement slag composite cementitious material could not be accurately characterized by chemical binding water method. (2) Ca (OH) _ 2 was consumed in the early hydration reaction of slag. After its activity was stimulated, Ca (OH) _ 2 was no longer consumed at the later stage of hydration, the content of Ca (OH) _ 2 in the cement slag composite cement paste was lower, and the microstructure of the cement and slag composite cement paste was looser in the early stage of curing at room temperature. In the later stage, the pore structure was optimized, the microstructure of cement paste was obviously improved by early high temperature curing, and the Ca / Si ratio of C / S / H gel was relatively low in the cement-slag composite cementing material. The C / S / H gel with low Ca / Si ratio produced by slag reaction is a foil sheet instead of a fibrous C / S / H gel formed by hydration of cement. (3) the hydration reaction of slag mainly produces HD C / S / H gel with high micromechanical properties. The micromechanical properties of the gel are related to its packing compactness, but not to its chemical composition. The slag reacts to form the Al / C / A / S / H gel and Al replaces Si in the bridge tetrahedron, and the average straight chain length of the gel increases with the increase of age. With the increase of slag content, the average length of silica-aluminum chain increases and the ratio of Al / Si increases. (4) the content of Ca (OH) _ 2 is still sufficient after the cement paste is corroded by soft water for a long time. The Ca / Si ratio of the adhesive is slightly lower, But there is no sign of decomposition. The porosity of cement and slag composite cementing material is lower and the corrosion resistance is better. The content of Ca (OH) _ 2 in concrete prepared from cement and slag composite cementing material is lower and the carbonization depth is larger, but it can meet the requirements of long-term stability. (5) when the slag content is not more than 70%, The hardened paste of cement and slag composite cementing material has more dense microstructure. The decrease of Ca (OH) _ 2 content in the slurry and the decrease of alkalinity of pore solution do not affect the long-term stability of the paste microstructure of the composite cementing material.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU528

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊華全,董維佳,王仲華;摻礦渣粉及粉煤灰混凝土微觀性能試驗(yàn)研究[J];長(zhǎng)江科學(xué)院院報(bào);2005年01期

2 何永佳;胡曙光;;~(29)Si固體核磁共振技術(shù)在水泥化學(xué)研究中的應(yīng)用[J];材料科學(xué)與工程學(xué)報(bào);2007年01期

3 何富強(qiáng);元強(qiáng);鄭克仁;劉運(yùn)華;鄒慶焱;;摻礦物摻合料混凝土ASTM C1202測(cè)試指標(biāo)的相關(guān)性[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年S2期

4 王強(qiáng);閻培渝;;大摻量礦渣復(fù)合膠凝材料的硬化漿體形貌特征[J];電子顯微學(xué)報(bào);2008年04期

5 姜奉華;徐德龍;;堿礦渣水泥硬化體孔結(jié)構(gòu)的分?jǐn)?shù)維特征[J];硅酸鹽通報(bào);2007年04期

6 鄭克仁,孫偉,賈艷濤,張?jiān)粕?郭麗萍;礦渣摻量對(duì)高水膠比水泥凈漿水化產(chǎn)物及孔結(jié)構(gòu)的影響[J];硅酸鹽學(xué)報(bào);2005年04期

7 閻培渝;;粉煤灰在復(fù)合膠凝材料水化過(guò)程中的作用機(jī)理[J];硅酸鹽學(xué)報(bào);2007年S1期

8 宋華;牛荻濤;李春暉;;礦物摻合料混凝土碳化性能試驗(yàn)研究[J];硅酸鹽學(xué)報(bào);2009年12期

9 徐彬,蒲心誠(chéng);礦渣玻璃體分相結(jié)構(gòu)與礦渣潛在水硬活性本質(zhì)的關(guān)系探討[J];硅酸鹽學(xué)報(bào);1997年06期

10 劉仍光;閻培渝;;水泥 礦渣復(fù)合膠凝材料中礦渣的水化特性[J];硅酸鹽學(xué)報(bào);2012年08期

相關(guān)博士學(xué)位論文 前1條

1 賈耀東;大摻量礦物摻合料混凝土的碳化特性研究[D];清華大學(xué);2010年

本文編號(hào)：2078177