本文選題：生物質(zhì)灰　切入點(diǎn)：水泥基復(fù)合膠凝材料　出處：《山東農(nóng)業(yè)大學(xué)》2017年碩士論文

【摘要】：生物質(zhì)能是一種清潔可再生能源,我國(guó)生物質(zhì)能資源豐富。應(yīng)用生物質(zhì)發(fā)電可對(duì)二氧化碳以及多種大氣污染物減排有顯著效果。當(dāng)前我國(guó)以生物質(zhì)為燃料的電廠發(fā)展迅速,生物質(zhì)灰的去向也亟待解決。國(guó)內(nèi)外很多學(xué)者針對(duì)生物質(zhì)灰在水泥混凝土中的應(yīng)用開展研究,發(fā)現(xiàn)生物質(zhì)灰中含有一些類似于粉煤灰的物相和化學(xué)組成,具有廣泛的價(jià)值潛力。但現(xiàn)有的研究仍無法在工業(yè)化生產(chǎn)中應(yīng)用,還有大量的理論研究工作需要完成。本文對(duì)比分析了生物質(zhì)灰與普通粉煤灰在粒度分布、顆粒形態(tài)、化學(xué)組成、活性指數(shù)、需水量比等方面的不同,通過研究復(fù)合水泥膠砂強(qiáng)度的變化規(guī)律以及硬化漿體的水化性能、礦物組成、微觀結(jié)構(gòu)、孔結(jié)構(gòu)等,對(duì)比分析生物質(zhì)灰和普通粉煤灰對(duì)水泥基復(fù)合膠凝材料水化硬化機(jī)理的影響,結(jié)果表明:在基本性能測(cè)試方面,生物質(zhì)灰顆粒形狀不規(guī)則、平均粒徑及粒徑分布范圍較大,具有特有的細(xì)長(zhǎng)纖維狀顆粒,且其活性組分Al2O3不足普通粉煤灰的三分之一;生物質(zhì)灰的火山灰活性小于普通粉煤灰。在水化初期,生物質(zhì)灰對(duì)復(fù)合膠凝材料強(qiáng)度貢獻(xiàn)主要以物理填充作用為主,隨著養(yǎng)護(hù)齡期的延長(zhǎng)其火山灰效應(yīng)逐漸顯現(xiàn),強(qiáng)度得以提高。相同摻量下,生物質(zhì)灰-水泥復(fù)合膠砂各齡期的抗壓強(qiáng)度、抗折強(qiáng)度均小于普通粉煤灰-水泥復(fù)合膠砂,但對(duì)抗折強(qiáng)度的削弱影響較小。生物質(zhì)灰摻量越大,復(fù)合膠砂的強(qiáng)度相比純水泥組下降程度越大。生物質(zhì)灰與粉煤灰的摻入均降低了復(fù)合膠凝材料的總水化程度,但體系中水泥水化程度卻由于生物質(zhì)灰與粉煤灰的稀釋作用而得到促進(jìn);生物質(zhì)灰與粉煤灰的摻量越大,水泥的水化程度越高。生物質(zhì)灰與粉煤灰的摻入導(dǎo)致水化產(chǎn)物中Ca(OH)2的含量減少,但對(duì)水泥水化產(chǎn)物的種類影響較小,由于普通粉煤灰的活性大于生物質(zhì)灰,因而其火山灰反應(yīng)消耗更多氫氧化鈣,所發(fā)揮的二次水化作用強(qiáng)于生物質(zhì)灰試驗(yàn)組。生物質(zhì)灰和粉煤灰的摻入減少了體系中的有害孔及多害孔的總數(shù)量,使孔徑得到了細(xì)化,體系中少害孔及無害孔增多,硬化漿體結(jié)構(gòu)朝著對(duì)耐久性有利的方向發(fā)展。與普通粉煤灰相比,摻加生物質(zhì)灰的硬化水泥漿體微觀形貌更為疏松多孔,特別是其特有的細(xì)長(zhǎng)纖維狀顆粒的存在。
[Abstract]:Biomass energy is a kind of clean and renewable energy, and our country is rich in biomass energy resources. The application of biomass power generation can reduce carbon dioxide and many kinds of atmospheric pollutants significantly. At present, the power plants with biomass as fuel are developing rapidly in our country. Many scholars at home and abroad have carried out research on the application of biomass ash in cement concrete, and found that biomass ash contains some phase and chemical composition similar to fly ash. But the existing research can not be used in industrial production, and a lot of theoretical research work needs to be completed. The particle size distribution and particle morphology of biomass ash and ordinary fly ash are compared and analyzed in this paper. Chemical composition, activity index, water demand ratio, etc., by studying the change law of composite cement sand strength and the hydration property, mineral composition, microstructure, pore structure of hardened mortar, etc., The effects of biomass ash and ordinary fly ash on the hydration and hardening mechanism of cement-based composite cementitious materials are compared and analyzed. The results show that the shape of biomass ash particles is irregular and the average particle size and particle size distribution range is large. It has special slender fibrous particles, and its active component Al2O3 is less than 1/3 of ordinary fly ash, and the pozzolanic activity of biomass ash is lower than that of ordinary fly ash. The contribution of biomass ash to the strength of composite cementitious materials is mainly physical filling. With the prolongation of curing age, the pozzolanic effect of biomass ash gradually appears and the strength is improved. The compressive strength and flexural strength of biomass ash-cement compound mortar at each age are smaller than those of ordinary fly ash cement compound cement sand, but the weakening of flexural strength has little effect. The strength of composite cement sand decreased more than that of pure cement group. The addition of biomass ash and fly ash decreased the total hydration degree of composite cementing material. However, the degree of cement hydration in the system is promoted by the dilution of biomass ash and fly ash. The higher the hydration degree of cement is, the lower the content of Ca(OH)2 in hydration products is due to the addition of biomass ash and fly ash, but the less the effect on the kinds of hydration products is, because the activity of ordinary fly ash is higher than that of biomass ash. As a result, the pozzolanic reaction consumes more calcium hydroxide and exerts a stronger secondary hydration effect than the biomass ash test group. The addition of biomass ash and fly ash reduces the total number of harmful pores and multiple harmful pores in the system and refines the pore size. With the increase of less harmful and harmless pores in the system, the structure of hardened slurry develops in a direction favorable to durability. Compared with ordinary fly ash, the microstructure of hardened cement paste with biomass ash is more porous and porous. In particular, the existence of its unique slender fibrous particles.
【學(xué)位授予單位】：山東農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

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