【摘要】：粉煤灰和磷石膏殘渣都屬于工業(yè)副產(chǎn)品,大量堆存不僅會惡化土壤、污染環(huán)境,而且還會造成資源浪費,這有悖于可持續(xù)發(fā)展的理念。本文結(jié)合粉煤灰及磷石膏殘渣的成分特點,研究了它們作為膠凝材料應用于硅酸鹽制品之中的可行性。首先對磷石膏殘渣和粉煤灰的主要化學成分及物相組成進行分析,結(jié)果表明研究所采用的磷石膏殘渣中主要成分為氧化鈣,而粉煤灰中含有大量的Si O2,即原材料適用于硅酸鹽制品的研究。在粉煤灰與磷石膏殘渣硅酸鹽制品中,凈漿試件的力學性能是粉煤灰活性大小的直接衡量標準,本文研究了粉煤灰摻量、激發(fā)劑種類及制品的養(yǎng)護制度等因素對粉煤灰磷石膏殘渣硅酸鹽制品力學強度的影響,進而判斷各個因素對粉煤灰活性的激發(fā)效果。研究結(jié)果表明:粉煤灰摻量幾乎不影響硅酸鹽制品的強度,水泥和Na OH對粉煤灰活性均有一定的激發(fā)作用,且當水泥摻量達到8%、Na OH摻量達到6%時,此激發(fā)效果更加明顯。此外,研究結(jié)果發(fā)現(xiàn):對于已經(jīng)摻加激發(fā)劑的硅酸鹽制品,采用高溫蒸養(yǎng)的方法并不能繼續(xù)提高其抗壓強度及抗折強度。在粉煤灰磷石膏殘渣硅酸鹽制品力學性能研究的基礎(chǔ)上,本文還對制品的抗凍性和抗碳化性能進行研究。結(jié)果發(fā)現(xiàn):隨著Na OH摻量的增加,粉煤灰磷石膏殘渣硅酸鹽制品的抗凍性和抗碳化性逐漸改善,且當Na OH摻量達到4%時,此作用效果更加顯著。而水泥對于增強粉煤灰磷石膏殘渣硅酸鹽制品的抗凍性能力和抗碳化性能力的作用不大。最后,本文對粉煤灰磷石膏殘渣硅酸鹽制品的組成及顯微結(jié)構(gòu)進行分析,研究結(jié)果顯示:相對于水泥而言,Na OH對于激發(fā)粉煤灰活性具有更為顯著的效果,且水化產(chǎn)物的生成與發(fā)展及制品的密實度等均隨NaOH摻量的增加而逐漸改善。
[Abstract]:Fly ash and phosphogypsum residue are industrial by-products, which will not only worsen the soil, pollute the environment, but also cause waste of resources, which is contrary to the idea of sustainable development. Based on the composition characteristics of fly ash and phosphogypsum residue, the feasibility of their application in silicate products as cementitious materials was studied. Firstly, the main chemical composition and phase composition of phosphogypsum residue and fly ash are analyzed. The results show that the main component of phosphogypsum residue is calcium oxide. Fly ash contains a large amount of Sio _ 2, that is, raw materials are suitable for the study of silicate products. In the silicate products of fly ash and phosphogypsum residue, the mechanical properties of the clean paste specimen are the direct measure standard of the fly ash activity. The content of fly ash is studied in this paper. The effects of activator type and curing system on mechanical strength of fly ash phosphogypsum residue silicate products are discussed, and the activation effect of each factor on fly ash activity is judged. The results show that the content of fly ash has little effect on the strength of silicate products. Both cement and NaOH can excite the activity of fly ash to some extent, and when the content of cement reaches 8% and Na OH content reaches 6%, the effect is more obvious. In addition, it is found that the high temperature steaming method can not improve the compressive strength and flexural strength of silicate products which have been mixed with activator. Based on the study of mechanical properties of fly ash phosphogypsum residue silicate products, the freezing resistance and carbonation resistance of the products are also studied in this paper. The results show that with the increase of NaOH content, the frost resistance and carbonation resistance of the silicate products from phosphogypsum residue of fly ash are improved gradually, and the effect is more remarkable when the content of NaOH reaches 4%. But cement has little effect on enhancing the frost resistance and carbonation resistance of fly ash phosphogypsum residue silicate products. Finally, the composition and microstructure of fly ash phosphogypsum residue silicate products are analyzed in this paper. The results show that NaOH has more remarkable effect on the activation of fly ash than cement. The formation and development of hydration products and the compactness of the products improved with the increase of NaOH content.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TQ170.4
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本文編號：2179144