發(fā)布時間：2018-04-05 16:05

  本文選題：鋼渣　切入點：高溫養(yǎng)護　出處：《北京化工大學(xué)》2015年碩士論文

【摘要】：鋼渣是煉鋼工業(yè)中產(chǎn)生的最主要的固體廢棄物之一,隨著全球的鋼產(chǎn)量的逐年遞增,隨之產(chǎn)生的鋼渣量也越來越多,而中國的粗鋼產(chǎn)量在2014年超過了世界鋼產(chǎn)量的一半,達到8.2億t,而作為副產(chǎn)物的鋼渣的產(chǎn)量也超過了1億t。因其化學(xué)和礦物組成與水泥熟料的成分類似,故將鋼渣作為水泥摻合料成為鋼渣綜合利用的主要途徑之一。本文主要研究了高溫和碳化養(yǎng)護對鋼渣水泥基膠凝材料性能的影響；以及預(yù)碳化鋼渣制備鋼渣水泥基膠凝材料性能。尤其對不同的養(yǎng)護方式下鋼渣膠凝材料的漿體結(jié)構(gòu)和水化產(chǎn)物,以及預(yù)碳化后鋼渣微粉的礦物組成的變化以及摻預(yù)碳化鋼渣后膠凝材料早期強度和安定性的改善情況做了詳盡的研究和分析。為提高摻鋼渣膠凝材料的早期強度和改善安定性提供理論支持。本實驗主要使用新余熱悶鋼渣,分析了高溫、碳化和標(biāo)準(zhǔn)養(yǎng)護對鋼渣膠凝材料性能的影響,結(jié)果表明,通過高溫碳化養(yǎng)護的方式,激發(fā)鋼渣活性,使大摻量鋼渣膠凝材料早期和后期的強度均大幅增加,達到了P42.5水泥強度等級,高溫養(yǎng)護只能提高膠凝材料的早期強度,由于早期過快的水化速率使得在硬化的漿體中引入大孔從而形成較多微觀裂縫,且早期高溫養(yǎng)護會阻礙水泥基材料的后期水化,所以其后期強度低于標(biāo)準(zhǔn)養(yǎng)護。研究結(jié)果表明,高溫碳化養(yǎng)護后的鋼渣水泥基材料表面生成了一層致密的CaCO3外殼,能提高膠凝材料的強度,并有效防止水泥基材料發(fā)生溶解侵析,提高膠凝材料的耐久性。高溫碳化養(yǎng)護生成的CaCO3的顆粒粒徑為1～8μm,在膠凝材料中能起到微集料作用,為C3S的水化起到了晶核的作用,從而加速C3S的水化速度。細(xì)小的CaCO3顆粒為Ca(OH)2提供了大量的晶核,使得Ca(OH)2生成的更加分散,不再生長成特定晶格取向的片層狀大顆粒,具有較好的力學(xué)性能。同時研究了對鋼渣微粉進行預(yù)碳化處理后替代30%水泥熟料,制備鋼渣水泥基膠凝材料。結(jié)果表明：預(yù)碳化鋼渣微粉后,鋼渣粉中的游離氧化鈣(f-CaO)以及其他鈣鹽如具有膠凝活性的C3S,C2S等均會被碳化生成CaCO3,且碳化后鋼渣中RO相的衍射峰幾乎消失,說明預(yù)碳化對改善膠凝材料安定性有一定的積極作用。使用TG-DTA和SEM-EDS以及水化放熱曲線分析摻預(yù)碳化鋼渣膠凝材料的水化產(chǎn)物的水化速率和水化程度,根據(jù)TG-DTA曲線的計算結(jié)果,漿體水化3d時,預(yù)碳化試樣的化學(xué)結(jié)合水量為21.65%,標(biāo)準(zhǔn)試樣為9.84%,即預(yù)碳化鋼渣膠凝材料試樣3d的水化程度是標(biāo)準(zhǔn)試樣的2.2倍,預(yù)碳化鋼渣膠凝材料28d的凈漿試樣總的化學(xué)結(jié)合水量為28.41%,標(biāo)準(zhǔn)試樣為24.04%,增長率為18.18%。說明預(yù)碳化可以有效提高膠凝材料早期水化速率和后期的水化程度。分析預(yù)碳化的凈漿試樣28d的SEM-EDS圖譜,發(fā)現(xiàn)其結(jié)構(gòu)密實,且主要水化產(chǎn)物—水化硅酸鈣已長成塊狀整體,在裂縫處放大,發(fā)現(xiàn)在水化硅酸鈣的連接處有棒狀連接物,經(jīng)能譜分析為Ca(OH)2。而未碳化的Ca(OH)2結(jié)構(gòu)呈片層狀。說明經(jīng)碳化后的摻鋼渣膠凝材料中的Ca(OH)2不再朝特定晶格取向生長,而是生長方向多元化,能更好的與水化硅酸鈣形成整體,增加材料的密實度。
[Abstract]:Steel slag is one of the main solid waste generated in the steel manufacturing industry, with the world's steel output has been increasing year by year, the amount of slag produced more and more, and the crude steel production in 2014 China more than half of the world's steel output, up to 820 million T, and as a byproduct of the production of steel slag is more than 100 million T. because of its chemical and mineral composition of cement clinker and similar components, so the steel slag as cement admixture has become one of the main ways of comprehensive utilization of steel slag. This paper mainly studies the influence of high temperature and carbonation of steel slag cementitious materials can be prepared; and pre carbonization steel slag cementitious properties of steel slag materials. Especially paste structure and hydration products of steel slag cementitious materials under different curing methods, and the change of composition after pre carbonization of slag powder and mixed with mineral pre carbonated steel slag cementitious materials after early Do a detailed analysis of the improvement of strength and stability. To provide theoretical support to improve the early strength and improve the stability of steel slag cementitious materials. This experiment used Xinyu heat-stuffing slag at high temperature was analyzed, and the effect of the curing carbonization, steel slag cementitious materials. The results showed that through high temperature carbonization curing way, stimulate the activity of steel slag, the early and late steel slag cementitious material strength were greatly increased, reached the P42.5 cement strength grade, high temperature curing can improve the early strength of cementitious materials, due to early hydration rate makes the big hole introduced in the hardened paste in order to form more micro cracks, late hydration and early stage curing will hinder the cement based material, so its late strength is lower than the standard curing. The results show that the steel slag cement curing after high temperature carbonization The material formed on the surface of the CaCO3 shell of a dense layer, can increase the strength of the cement, and effectively prevent the occurrence of dissolved leaching of cement-based materials, improve the durability of cementitious materials. High temperature curing of the generated CaCO3 particle size of 1~8 m, the micro aggregate effect can play in cementitious materials in the nucleus role for the hydration of C3S, so as to accelerate the hydration speed of C3S. The fine CaCO3 particles of Ca (OH) 2 provides a large amount of crystal nucleus, the Ca (OH) 2 generation is more dispersed, not large particles grow into specific regeneration lamellar crystal orientation, has good mechanical properties. At the same time on the pre carbonization process of steel slag powder instead of 30% cement clinker, preparation of steel slag cementitious materials. The results showed that the pre carbonization of steel slag powder, slag powder of free calcium oxide (f-CaO) and other calcium salts such as cementitious activity. C3S, C2S etc. will Carbonization of CaCO3 generation, and the diffraction peak of RO phase after carbonization in the slag almost disappeared, indicating pre carbonization to improve a certain positive role in cementitious materials. The stability analysis of hydration products with pre carbonation of steel slag cementitious materials using TG-DTA and SEM-EDS as well as the hydration exothermic curve of hydration rate and hydration degree according to the calculation results, TG-DTA curve, 3D water slurry, chemical pre carbonization samples with water was 21.65%, the standard sample is 9.84%, the hydration degree of pre carbonization steel slag cementitious material 3D specimen is 2.2 times the standard sample, pre carbonation of steel slag cementitious materials 28d paste sample total chemical the water was 28.41%, the standard sample is 24.04%, the growth rate of 18.18%. shows that the pre carbonization can effectively improve the degree of hydration of cementitious material hydration rate and later. SEM-EDS analysis paste sample 28d pre carbonization, the dense solid structure, And the main hydration product of calcium silicate hydrate has grown into a whole block, magnified in the cracks, found at the connection of calcium silicate in water rod connected by energy spectrum analysis, Ca (OH) 2. and Ca (OH) 2 carbide structure is layered by adding slag after carbonization. The cementitious material of Ca (OH) 2 is no longer in a particular lattice orientation growth, but the growth direction of diversification, the better is formed integrally with the hydrated calcium silicate, increase the density of the material.

【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ172.44

【參考文獻】

相關(guān)期刊論文 前8條

1 吳偉偉;楊錢榮;;鋼渣水硬活性及在水泥混凝土中的應(yīng)用研究進展[J];粉煤灰綜合利用;2009年06期

2 馮春花;李東旭;苗琛;王小鵬;;助磨劑對鋼渣細(xì)度和活性的影響[J];硅酸鹽學(xué)報;2010年07期

3 梁曉杰;葉正茂;常鈞;;碳酸化鋼渣復(fù)合膠凝材料早期水化活性[J];硅酸鹽學(xué)報;2012年02期

4 王強;鮑立楠;閻培渝;;轉(zhuǎn)爐鋼渣粉在水泥混凝土中應(yīng)用的研究進展[J];混凝土;2009年02期

5 張作順;徐利華;余廣煒;唐衛(wèi)軍;賽音巴特爾;孫鵬輝;郝洪順;翟偉;;機械激發(fā)對鋼渣礦渣微粉活性的影響[J];混凝土;2010年10期

6 侯新凱;徐德龍;薛博;李虎森;;鋼渣引起水泥體積安定性問題的探討[J];建筑材料學(xué)報;2012年05期

7 尚建麗;張凱峰;;大摻量工業(yè)廢渣激發(fā)制備鋼渣復(fù)合膠凝材料的試驗研究[J];化工新型材料;2013年04期

8 秦萍;鋼渣治理與利用技術(shù)的進展[J];沿海環(huán)境;2003年01期

相關(guān)碩士學(xué)位論文 前1條

1 李偉峰;轉(zhuǎn)爐鋼渣的理化性質(zhì)及資源化研究[D];北京化工大學(xué);2008年

，

本文編號：1715480