本文選題：礦渣 + 復合膠凝材料�。� 參考：《清華大學》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)境效應和經濟效應。為了保證用其配制的混凝土的耐久性，水泥 礦渣復合膠凝材料漿體在服役環(huán)境中的長期性能值得關注。本文對水泥 礦渣復合膠凝材料的水化機理和長期性能進行了研究，主要研究內容和相關結論如下： (1)水泥 礦渣復合膠凝材料在常溫養(yǎng)護下，礦渣早期反應速率慢，后期反應程度提高較多；礦渣摻量不大于70%時，摻量對其反應程度影響不大，水泥 礦渣復合膠凝料硬化漿體孔溶液pH值達到12.6以上時，可較好地激發(fā)礦渣的活性；水泥 礦渣復合膠凝材料的總反應程度低于純水泥；高溫養(yǎng)護能較好地激發(fā)早期礦渣的活性，使礦渣早期的反應程度提高，但后期沒有進一步提升礦渣的反應程度；化學結合水量法不能準確地表征水泥 礦渣復合膠凝材料的反應程度。 (2)礦渣早期的水化反應會消耗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 礦渣復合膠凝漿體中的Ca(OH)2含量較低；常溫養(yǎng)護下早期水泥 礦渣復合膠凝材料硬化漿體的微觀結構較為疏松，后期明顯改善，孔隙結構優(yōu)化；早期高溫養(yǎng)護使復合膠凝材料漿體微觀結構得到顯著改善；水泥 礦渣復合膠凝材料中C S H凝膠的Ca/Si比較低，礦渣反應生成的低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)礦渣水化反應主要生成微觀力學性能高的HD C S H凝膠，凝膠的微觀力學性能與其堆積密實度相關，與其化學組成無關。礦渣反應生成含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，凝膠的平均直鏈長度增加，隨著礦渣摻量的增加，C A S H凝膠的平均硅鋁鏈長度增大，Al/Si比增加。 (4)水泥 礦渣復合膠凝材料硬化漿體遭受長期軟水溶蝕后，Ca(OH)2含量仍充足，C S H凝膠的Ca/Si比稍有降低，但沒有分解的跡象。水泥 礦渣復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，但滿足長期穩(wěn)定性的要求。 (5)礦渣摻量不超過70%時，水泥 礦渣復合膠凝材料硬化漿體具有更加密實的微觀結構，漿體中Ca(OH)2含量的適量減少和孔溶液堿度的降低，沒有影響復合膠凝材料漿體微觀結構的長期穩(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.
【學位授予單位】：清華大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU528

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