本文選題：水淬玻璃體　切入點(diǎn)：礦渣　出處：《武漢理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：礦渣作為一種常見(jiàn)的礦物摻合料被廣泛應(yīng)用于現(xiàn)代混凝土領(lǐng)域�，F(xiàn)階段研究認(rèn)為,礦渣在混凝土中的作用機(jī)理主要體現(xiàn)為微集料效應(yīng)、微晶核效應(yīng)和活性效應(yīng)等三個(gè)方面。微集料效應(yīng)促使混凝土形成最緊密堆積結(jié)構(gòu),微晶核效應(yīng)減小界面有害晶體的尺寸,活性效應(yīng)增加凝膠組分含量,三者都起到增強(qiáng)混凝土密實(shí)度的作用。本文著眼于礦渣的化學(xué)組成,研究礦渣水化產(chǎn)物,尤其是LDHs型水化產(chǎn)物在抗硫酸鹽侵蝕中的作用。本文的研究成果將為混凝土防腐技術(shù)開(kāi)拓新的思路。礦渣主體為非晶態(tài)玻璃體,礦渣活性與玻璃體含量及自身細(xì)度密切相關(guān)。本文以礦渣玻璃體三維網(wǎng)絡(luò)結(jié)構(gòu)理論為依據(jù),采用混合均勻的氧化物經(jīng)高溫熔融-水淬冷卻的方法,成功合成了較為純凈的水淬玻璃體。以水淬玻璃體模擬高爐礦渣,探究礦渣水化產(chǎn)物的形貌、種類、數(shù)量與其化學(xué)組成的關(guān)系,并論證了LDHs型水化產(chǎn)物的數(shù)量與其鎂含量成正比。將水淬玻璃體摻入硅酸鹽水泥熟料,與粉煤灰一并組成水泥基材料,采用硫酸鹽干濕循環(huán)的加速侵蝕實(shí)驗(yàn)方法對(duì)水泥基材料進(jìn)行處理,測(cè)試其抗硫酸鹽侵蝕性能,采用XRD、SEM、XEDS等測(cè)試手段對(duì)其微觀機(jī)理進(jìn)行分析。實(shí)驗(yàn)研究表明:1、以CaO、Si O2、Al2O3及MgO的混合物經(jīng)高溫熔融、水淬冷卻,可以得到含極少量硅酸鹽礦物晶體的玻璃體,稱之為水淬玻璃體。通過(guò)原料配比計(jì)算,可設(shè)計(jì)出所需化學(xué)組成的水淬玻璃體,并以此模擬高爐礦渣。非橋氧數(shù)反映玻璃體三維網(wǎng)絡(luò)結(jié)構(gòu)聚合度,可以作為預(yù)測(cè)水淬玻璃體活性的重要指標(biāo)。礦渣活性不僅受玻璃體聚合度影響,還跟其細(xì)度有關(guān)系。2、水淬玻璃體的主要水化產(chǎn)物類型為C-S-H(I)與Mg-Al水滑石,其中Mg-Al水滑石為L(zhǎng)DHs型水化產(chǎn)物。隨著礦渣鎂含量的提高,LDHs型水化產(chǎn)物的數(shù)量增多,水化28天齡期以后不再隨齡期的延長(zhǎng)而發(fā)生明顯變化。3、摻水淬玻璃體的水泥基材料抗硫酸鹽侵蝕性能與對(duì)照組相比有明顯改善。隨干濕循環(huán)次數(shù)的增加,試件表現(xiàn)出先收縮后膨脹的特點(diǎn),試件質(zhì)量表現(xiàn)出先增加后減少的規(guī)律,吸水率表現(xiàn)為持續(xù)上升,強(qiáng)度則表現(xiàn)為持續(xù)降低。4、與堿激發(fā)礦渣相比,粉煤灰-礦渣-熟料水泥基材料的水化產(chǎn)物中Mg-Al水滑石含量較少,并與C-S-H凝膠共存,難以直接觀測(cè)。該水泥基材料受硫酸鹽侵蝕后Ca(OH)2含量減少,侵蝕產(chǎn)物主要為針棒狀鈣礬石。
[Abstract]:Slag, as a common mineral admixture, is widely used in the field of modern concrete. The micronucleus effect and the active effect promote the formation of the most compact stacking structure of concrete. The micronucleus effect decreases the size of the harmful crystal at the interface, and the active effect increases the content of the gel component. All three play an important role in enhancing the compactness of concrete. This paper focuses on the chemical composition of slag and studies the hydration products of slag. Especially the role of LDHs hydration products in sulfate corrosion resistance. The research results in this paper will open up a new way of thinking for concrete anticorrosion technology. The main body of slag is amorphous vitreous body. The activity of slag is closely related to the content of vitreous body and the fineness of vitreous body. Based on the theory of 3D network structure of slag vitreous body, this paper adopts the method of mixing homogeneous oxide through high temperature melting and water quenching cooling. A relatively pure water-quenched vitreous body was successfully synthesized. The water quenched vitreous body was used to simulate blast furnace slag, and the relationship between the morphology, species, quantity and chemical composition of the hydration product of slag was investigated. It is demonstrated that the quantity of LDHs hydration product is proportional to its magnesium content. Water quenched glass is mixed with Portland cement clinker to form cement based material with fly ash. The accelerated erosion test method of sulphate dry-wet cycle was used to treat cement based materials, and the resistance to sulfate erosion was tested. The microcosmic mechanism was analyzed by means of XRD-SEMS-XEDS. The experimental results show that glass containing a small amount of silicate mineral crystals can be obtained by using the mixture of Cao Si O 2 O 2 Al 2O 3 and MgO by melting at high temperature and cooling by water quenching. It is called water-quenched vitreous body. By calculating the proportion of raw material, the water-quenched vitreous body with chemical composition can be designed, and the blast furnace slag can be simulated. The unbridged oxygen number reflects the degree of 3D network aggregation of vitreous body. The activity of slag is affected not only by the degree of vitreous polymerization, but also by its fineness. The main hydration products of water-quenched vitreous body are C-S-HNI) and Mg-Al hydrotalcite. Among them, Mg-Al hydrotalcite is the hydration product of LDHs type, and the quantity of LDHs hydration product increases with the increase of slag magnesium content. After 28 days of hydration, there was no obvious change with the prolongation of the age. The resistance to sulfate erosion of the cement based materials with water quenched vitreous was obviously improved compared with the control group, and with the increase of dry-wet cycle times, the resistance to sulfate erosion of the cement based materials with water quenched vitreous was improved obviously compared with the control group. The specimen showed the characteristics of first shrinkage and then expansion. The quality of the specimen was increased first and then decreased. The water absorption rate increased continuously, and the strength decreased by .4. compared with the alkali-activated slag, the quality of the specimen increased firstly and then decreased. The content of Mg-Al hydrotalcite in the hydration products of fly ash, slag and clinker cement-based materials is less and coexists with C-S-H gel, so it is difficult to observe directly. The Ca(OH)2 content of the cement based material is reduced after sulfate erosion, and the main product is needle-rod ettringite.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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