本文選題：廢棄加氣混凝土　切入點(diǎn)：鋯渣　出處：《南京理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：廢棄的加氣混凝土數(shù)量龐大,并占用大量土地,加氣混凝土行業(yè)的健康發(fā)展受到了極大的限制。同時(shí),硅酸鈣絕熱材料因其密度小,強(qiáng)度高,易加工,保溫效果好,可回收利用等特點(diǎn),在講究節(jié)能減排,可持續(xù)發(fā)展的當(dāng)今社會中受到了極大的重視。利用廢棄砂加氣混凝土作為主要硅質(zhì)原料,硅藻土和鋯渣作為次要硅質(zhì)原料,通過調(diào)整廢棄砂加氣混凝土占硅質(zhì)原料總量的比例制備托貝莫來石型硅酸鈣絕熱材料,并摻加泥粉,聚醋酸乙烯乳膠等添加劑提高材料力學(xué)性能。借助力學(xué)試驗(yàn)測試儀,XRD,氮吸附等近現(xiàn)代化測試技術(shù)分析不同原料配比制得的托貝莫來石型硅酸鈣絕熱材料的抗折強(qiáng)度,高溫線收縮率,物相組成,結(jié)構(gòu)形貌等。廢棄加氣混凝土摻量為70%時(shí)制得的硅酸鈣材料主要物相是結(jié)晶良好的托貝莫來石型水化硅酸鈣,容重為285 kg/m3,導(dǎo)熱系數(shù)為0.069 W/(m.K),抗折強(qiáng)度達(dá)到0.26 MPa。廢棄加氣混凝土摻量為100%,泥粉摻量為50%,聚醋酸乙烯乳膠摻量為7%時(shí)制得的硅酸鈣材料抗折強(qiáng)度達(dá)到0.51 MPa。并利用高溫煅燒活化后的砂加氣混凝土制備硅酸鈣絕熱材料,研究其物理力學(xué)性能,分析廢棄加氣混凝土高溫活化在制備托貝莫來石型硅酸鈣絕熱材料過程中的作用機(jī)制。利用微米尺度、無定形二氧化硅與氧化鈣制備層間距為11.3A托貝莫來石,研究了托貝莫來石725℃高溫煅燒過程中微結(jié)構(gòu)變化。托貝莫來石經(jīng)過725℃煅燒2h轉(zhuǎn)變?yōu)槊摿u基托貝莫來石(無定形態(tài)),這種無定型非晶態(tài)結(jié)構(gòu)的形貌和托貝莫來石的晶體形貌相似,都是針狀、片狀的晶體以及大量顆粒狀結(jié)構(gòu),這些顆粒狀結(jié)構(gòu)由針狀、片狀結(jié)構(gòu)互相交錯堆積形成；在725℃煅燒溫度下,部分納米尺度的托貝莫來石轉(zhuǎn)變?yōu)閱涡辨湢畹墓杌沂Y(jié)構(gòu)(結(jié)晶態(tài))。將11.3A托貝莫來石725 ℃煅燒2h后制備高溫脫水相。研究再水化試樣的鹽酸不溶物、有效鈣以及結(jié)合水含量變化,分析再水化反應(yīng)歷程變化,發(fā)現(xiàn)反應(yīng)歷程滿足對數(shù)變化：F(t)=k1ek2t+k3;利用XRD,SEM,TEM和氮吸附等近現(xiàn)代檢測分析技術(shù)研究11.3A托貝莫來石高溫脫水相再水化過程中的物相結(jié)構(gòu)變化。從研究結(jié)果看,11.3A托貝莫來石的再水化過程產(chǎn)物包括新生成的11.3A托貝莫來石、CSH凝膠。在再水化過程中,層片狀的脫羥基托貝莫來石結(jié)構(gòu)會溶解反應(yīng)生成CSH凝膠,并隨著再水化反應(yīng)的進(jìn)行,CSH凝膠會轉(zhuǎn)變?yōu)?1.3A托貝莫來石。
[Abstract]:The healthy development of aerated concrete industry is greatly restricted by the large quantity of waste aerated concrete, which occupies a large amount of land. At the same time, because of its small density, high strength, easy processing and good insulation effect, calcium silicate insulation material is easy to be processed. The characteristics of recycling have been paid great attention in the society of energy saving and emission reduction and sustainable development. Waste sand aerated concrete is used as the main siliceous raw material, diatomite and zirconium slag are used as secondary siliceous raw materials. The Tobamolite-type calcium silicate insulation material was prepared by adjusting the proportion of waste sand aerated concrete to the total amount of siliceous raw materials and mixed with mud powder. The mechanical properties of the materials were improved by additives such as polyvinyl acetate latex. The flexural strength of the Tobiamurite type calcium silicate adiabatic material was analyzed by means of mechanical test instrument XRD, nitrogen adsorption and other modern testing techniques. High temperature linear shrinkage, phase composition, structure morphology, etc. The main phase of calcium silicate material made of 70% waste aerated concrete is the well-crystallized Tobamolite calcium silicate, The bulk density is 285 kg / m ~ (3), the thermal conductivity is 0.069 W / m ~ (-1), the flexural strength is 0.26 MPA, the volume of waste aerated concrete is 100, the amount of mud powder is 50 and the content of polyvinyl acetate emulsion is 7. The flexural strength of calcium silicate material is 0.51 MPA. Calcined activated Sand aerated concrete to prepare calcium silicate Thermal Insulation material, The physical and mechanical properties were studied, and the mechanism of high temperature activation of waste aerated concrete in the preparation of Tobamolite-type calcium silicate insulation material was analyzed. The spacing between amorphous silica and calcium oxide preparation layer is 11.3A tob mullite, The changes of microstructure of tobermorite during high temperature calcination at 725 鈩，

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