本文選題：粉煤灰 + 地聚物��； 參考：《材料導報》2016年24期

【摘要】：以粉煤灰基地質(zhì)聚合物為研究對象,研究了粉煤灰在地聚物反應體系下的反應影響因素。主要研究內(nèi)容有:反應時間、反應溫度和反應堿濃度對反應過程及宏觀強度的影響及相關(guān)反應機理。結(jié)果表明:在反應中后期,粉煤灰反應速率明顯下降而此時地聚物的宏觀性能反而呈現(xiàn)最大值。以75℃為例,反應時間從24h延長到672h的過程中,反應程度僅從20.8%增加到了32.4%,平均反應速率僅為0.0179%/h,而此時樣品的抗壓強度則從1.31MPa增加到了7.98 MPa;在地聚物反應體系下,反應產(chǎn)物為無定形的硅鋁膠凝體,該物質(zhì)的致密程度與地聚物宏觀性能直接相關(guān);溫度的升高可有效提高粉煤灰的反應速率及地聚物的宏觀性能,促進無定形膠凝體的形成和硬化。反應24h,75℃下的反應程度和抗壓強度可以達到20.8%和1.31 MPa,而同期35℃下的反應程度只能達到7.8%且尚未形成宏觀強度;堿濃度的變化不僅可影響反應速率和宏觀性能,還可改變粉煤灰在地聚物反應體系下的最終反應程度,在反應溫度為75℃和50℃時,10 mol/L體系下672h的反應程度比5 mol/L體系分別高了90%和28.6%。
[Abstract]:The factors influencing the reaction of fly ash in the system of geopolymer reaction were studied with the fly ash base polymer as the research object. The effects of reaction time, reaction temperature and reaction alkali concentration on the reaction process and macroscopical strength were studied. The results showed that the reaction rate of fly ash decreased obviously at the middle and late stage of the reaction, but the macroscopical properties of the geopolymer showed the maximum value at the same time. Taking 75 鈩，

本文編號：2008839