【摘要】：水泥行業(yè)由于CO_2排放量巨大已成為低碳改革關(guān)注的焦點(diǎn)。隨著時(shí)代發(fā)展,低碳經(jīng)濟(jì)將成為水泥行業(yè)今后發(fā)展的新模式。粉煤灰地聚合物不僅可以實(shí)現(xiàn)固體廢棄物資源化利用,而且可以部分代替水泥。這對(duì)于我國(guó)這樣一個(gè)能源緊缺和環(huán)境污染比較嚴(yán)重的國(guó)家具有重要意義。本文以堿激發(fā)理論和原材料物理化學(xué)性質(zhì)為基礎(chǔ),通過(guò)分析粉煤灰地聚合物強(qiáng)度的影響因素得出最佳配比并建立強(qiáng)度發(fā)展定性預(yù)測(cè)模型。通過(guò)微觀手段以及水化熱試驗(yàn)分析粉煤灰地聚合物的水化機(jī)理。在上述研究基礎(chǔ)上,分析水玻璃模數(shù)、水玻璃摻量和礦渣摻量等因素對(duì)粉煤灰地聚合物耐高溫性能的影響以及影響機(jī)理。粉煤灰地聚合物力學(xué)性能研究表明,粉煤灰地聚合物抗壓強(qiáng)度受水玻璃模數(shù)、水玻璃摻量和礦渣摻量影響較大;水玻璃模數(shù)1.2、水玻璃摻量20%、礦渣摻量40%、熟石灰摻量3%~10%時(shí),粉煤灰地聚合物28d抗壓強(qiáng)度最高可達(dá)72.66MPa,符合P·O52.5水泥對(duì)抗壓強(qiáng)度的要求;粉煤灰地聚合物強(qiáng)度模型由線(xiàn)性增長(zhǎng)階段和平臺(tái)階段組成,并以水玻璃模數(shù)、水玻璃摻量和礦渣摻量等因素為變量。粉煤灰地聚合物水化機(jī)理研究結(jié)果表明,粉煤灰地聚合物的水化產(chǎn)物主要包括-Si-O-Al-O-鍵形成的絮狀聚合物凝膠體、C-S-H凝膠體和鐵鋁酸四鈣結(jié)晶體;在粉煤灰地聚合物中,溶出的Ca2+和水玻璃膠團(tuán)中活性Si O_2反應(yīng)生成C-S-H凝膠,凝膠以膠團(tuán)為核心生長(zhǎng)并與相鄰膠團(tuán)的產(chǎn)物相互搭接形成整體;粉煤灰與礦渣中Si-O鍵和Al-O鍵斷裂形成低聚單體,在脫水條件下低聚單體與膠核發(fā)生聚合,聚合體不斷擴(kuò)大并與相鄰膠核聚合形成完整的空間網(wǎng)絡(luò)結(jié)構(gòu)。粉煤灰地聚合物耐高溫性能研究結(jié)果表明,在高溫作用下,水玻璃摻量高、水玻璃模數(shù)低且礦渣摻量高的試件開(kāi)裂情況較嚴(yán)重,且抗壓強(qiáng)度增幅較小特別在800℃后強(qiáng)度顯著降低;在高溫作用下,漿體失水收縮使結(jié)構(gòu)更加致密;在高溫作用下,漿體熔融出現(xiàn)液相,冷卻后可形成堅(jiān)固的玻璃體,從而建立更高強(qiáng)度;試件失水導(dǎo)致開(kāi)裂和質(zhì)量損失,骨料與漿體變形不協(xié)調(diào)導(dǎo)致漿體與骨料分離整體強(qiáng)度下降。
[Abstract]:Due to the huge CO_2 emissions, cement industry has become the focus of low-carbon reform. With the development of the times, low-carbon economy will become a new model of cement industry in the future. Fly ash polymer can not only realize the resource utilization of solid waste, but also partly replace cement. This is of great significance to China, a country with serious energy shortage and serious environmental pollution. Based on alkali excitation theory and physical and chemical properties of raw materials, the optimum ratio of fly ash ground polymer strength is obtained by analyzing the influencing factors of fly ash ground polymer strength, and a qualitative prediction model for strength development is established in this paper. The hydration mechanism of fly ash ground polymer was analyzed by microcosmic means and hydration thermal test. On the basis of the above research, the effects of sodium silicate modulus, sodium silicate content and slag content on the high temperature resistance of fly ash ground polymer and its mechanism are analyzed. The mechanical properties of fly ash polymer show that the compressive strength of fly ash polymer is greatly affected by the modulus of sodium silicate, the content of sodium silicate and the content of slag, when the modulus of sodium silicate is 1.2, the content of sodium silicate is 20%, the content of slag is 40%, and the content of lime is 3% 鈮，

本文編號(hào)：2502733