發(fā)布時間：2018-04-17 05:29

  本文選題：高嶺土 + 活性測定��； 參考：《長沙理工大學(xué)》2014年碩士論文

【摘要】：地質(zhì)聚合物作為一種新型材料,在土木工程領(lǐng)域有著廣泛的應(yīng)用。本文通過理論研究,系統(tǒng)地揭示了地質(zhì)聚合反應(yīng)的基本原理,并以此為理論根本,以激發(fā)效果好、反應(yīng)速率快、反應(yīng)完全、生成物強度高等高效的反應(yīng)機(jī)理為出發(fā)點,采用山西煤系高嶺土為原料,氫氧化鈉和硅酸鈉為復(fù)合激發(fā)劑,制備偏高嶺土基地質(zhì)聚合物水泥和地粘結(jié)劑,以應(yīng)用于工程實踐。偏高嶺土基地質(zhì)聚合物水泥制備過程中的首要問題就是偏高嶺土的活性問題。評定偏高嶺土活性的最直接方法是比較生成的偏高嶺土基地質(zhì)聚合物的抗壓強度,但該方法周期較長,不利于實用。本文通過對高溫煅燒后偏高嶺土的DSC-TG分析、XRD分析和NMR分析,討論了偏高嶺土活性與其中活性氧化鋁含量的相關(guān)性,探索了偏高嶺土的高溫活化機(jī)理和活性測定原理,提出了改進(jìn)的滴定絡(luò)合法和紫外分光光度計法并應(yīng)用于偏高嶺土活性測定,進(jìn)而通過偏高嶺土地聚物的力學(xué)性能試驗予以驗證。試驗結(jié)果表明,煅燒溫度對偏高嶺土的活性有顯著影響,隨煅燒溫度升高呈現(xiàn)先提高后降低的規(guī)律；滴定絡(luò)合法和紫外分光光度計法可以測定鋁的溶出率并且用于偏高嶺土活性的快速測定；山西煤系高嶺土在煅燒溫度800。C,煅燒時間4h的條件下,可以獲得最高活性的偏高嶺土。選擇煅燒后、活性最佳的高嶺土為原料,以氫氧化鈉和硅酸鈉為復(fù)合堿性激發(fā)劑,制備偏高嶺土基地質(zhì)聚合物水泥。探討了配合比、養(yǎng)護(hù)條件等工藝因素對偏高嶺土基地質(zhì)聚合物的凝結(jié)時間和力學(xué)性能的影響。研究發(fā)現(xiàn)以100g偏高嶺土為原料,25g氫氧化鈉、30ml硅酸鈉(模數(shù)2.0)、20ml水為復(fù)合堿性激發(fā)劑,在養(yǎng)護(hù)條件為70℃、60min下,制備的地質(zhì)聚合物強度最高,達(dá)到88.96Mpa。同時使用維卡儀,對地質(zhì)聚合反應(yīng)的凝結(jié)時間做了系統(tǒng)的研究,發(fā)現(xiàn)控制激發(fā)劑中各物質(zhì)的含量可以控制地質(zhì)聚合反應(yīng)的凝結(jié)硬化時間,并且發(fā)現(xiàn)水的用量對地聚物強度影響并不大,但可以通過控制水的用量來控制初凝和終凝時間。最后,以最優(yōu)配比偏高嶺土基地質(zhì)聚合物作為膠黏劑替代普通環(huán)氧類膠黏劑加固鋼筋混凝土試件,通過不同溫度下的拉伸剪切試驗和表層嵌貼CFRP—混凝土界面剪切試驗,研究偏高嶺土基地質(zhì)聚合物膠黏劑的拉伸剪切強度和作為CFRP的內(nèi)嵌粘結(jié)劑的強度隨溫度的變化規(guī)律,并與普通環(huán)氧類膠黏劑作對比,發(fā)現(xiàn)其優(yōu)勢所在。結(jié)果發(fā)現(xiàn)：在常溫環(huán)境下,環(huán)氧樹脂粘結(jié)劑的粘結(jié)性能優(yōu)于地質(zhì)聚合物粘結(jié)劑的粘結(jié)性能；但在高溫環(huán)境下,環(huán)氧樹脂粘結(jié)劑的粘結(jié)性能明顯下降,而地質(zhì)聚合物粘結(jié)劑的粘結(jié)性能則基本不受溫度變化的影響。這對于將地質(zhì)聚合物粘結(jié)劑用于防火等級較高的結(jié)構(gòu),有著重要的意義。
[Abstract]:As a new material, geopolymers are widely used in civil engineering.In this paper, the basic principle of geological polymerization is systematically revealed through theoretical research, and the basic theory is based on the high efficiency reaction mechanism, such as good excitation effect, fast reaction rate, complete reaction, high product strength and so on.Using Shanxi coal series kaolin as raw material, sodium hydroxide and sodium silicate as complex activators, the base polymer cement and ground binder of metakaolin were prepared for application in engineering practice.The activity of metakaolin is the most important problem in the preparation of metakaolin base polymer cement.The most direct method to evaluate the activity of metakaolin is to compare the compressive strength of the formed metakaolin base polymer, but this method has a long period and is not practical.In this paper, the correlation between the activity of metakaolin and the content of active alumina in metakaolin is discussed by means of DSC-TG and NMR analysis. The activation mechanism at high temperature and the determination principle of activity of metakaolin are explored.The improved titration method and ultraviolet spectrophotometer method were proposed and applied to the determination of the activity of metakaolin, and the results were verified by the mechanical properties test of metakaolin geopolymer.The results show that the calcination temperature has a significant effect on the activity of metakaolin, and increases first and then decreases with the increase of calcination temperature.Titration complex method and ultraviolet spectrophotometer can be used to determine the dissolution rate of aluminum and rapid determination of the activity of metakaolin, and the highest activity of metakaolin can be obtained under the condition of calcination temperature 800.C and calcination time 4h.After calcination, kaolin with the best activity was used as raw material, sodium hydroxide and sodium silicate were used as complex basic activators to prepare metakaolin base polymer cement.The effects of mixing ratio and curing conditions on the setting time and mechanical properties of metakaolin base polymer were discussed.It is found that the geopolymers prepared by using 100g metakaolin as raw material and 25g sodium hydroxide 30ml sodium silicate (20ml water as composite basic activator at 70 鈩，

本文編號：1762296