本文選題：固硫灰-鈦礦渣 + 水泥��； 參考：《西南科技大學(xué)》2015年碩士論文

【摘要】：混凝土的組分越來越復(fù)雜,導(dǎo)致復(fù)合膠凝材料體系與高效減水劑的相容性問題成為影響混凝土施工性能最重要的因素。其中,劣質(zhì)輔助性膠凝材料對水泥與高效減水劑之間相容性的影響較大。固硫灰、鈦礦渣均屬于亟待利用的低等級(jí)輔助性膠凝材料,故本課題針對固硫灰-鈦礦渣復(fù)合輔助性膠凝材料對水泥與高效減水劑之間相容性的影響進(jìn)行了研究。試驗(yàn)研究選用了聚羧酸系及萘系兩種高效減水劑。首先通過Marsh筒凈漿測試法,研究了固硫灰/鈦礦渣比值及固硫灰細(xì)度變化對水泥與減水劑相容性的影響。接著對Marsh筒法研究結(jié)果進(jìn)行了定量評(píng)價(jià)。最后,從減水劑吸附特性、漿體Zeta電位、凝結(jié)時(shí)間及流變-觸變性等角度探究了固硫灰-鈦礦渣影響水泥與減水劑相容性的機(jī)理。結(jié)果顯示,隨著固硫灰-鈦礦渣比值增加,一方面,提高復(fù)合膠凝材料對減水劑的消耗量和漿體水化速率,使?jié){體飽和摻量、經(jīng)時(shí)損失率及泌水點(diǎn)增加。另一方面,固硫灰-鈦礦渣比值增加時(shí),因增加漿體屈服應(yīng)力和塑性粘度,而延長漿體的初始Marsh時(shí)間。粉磨過程減小了固硫灰的顆粒粒徑,破壞了其孔結(jié)構(gòu),且增加了顆粒比表面積。故隨著固硫灰細(xì)度降低,復(fù)合膠凝材料體系對減水劑的吸附量、漿體屈服應(yīng)力及塑性粘度均降低,使?jié){體Marsh時(shí)間、飽和摻量、經(jīng)時(shí)損失及泌水點(diǎn)均減小。聚羧酸減水劑對復(fù)合膠凝材料體系的分散及維持流動(dòng)性的作用較萘系減水劑強(qiáng),即便萘系減水劑可明顯提高漿體的Zeta電位值。相容性定量分析與定性實(shí)驗(yàn)結(jié)果匹配度較高,且分析結(jié)果說明聚羧酸減水劑對水泥漿體的作用效果受固硫灰摻量的影響較大,而萘系減水劑的作用效果受固硫灰細(xì)度影響較大。通過本課題的研究,作者建議當(dāng)復(fù)合膠凝材料體系中固硫灰／鈦礦渣比值低于1時(shí)選用聚羧酸系減水劑；比值較高時(shí)適宜選用萘系減水劑。固硫灰、鈦礦渣雖為固體廢棄物,但兩者復(fù)合后能起到取長補(bǔ)短的作用,可較好地應(yīng)用于水泥體系。
[Abstract]:As the composition of concrete becomes more and more complex, the compatibility of composite cementitious material system and superplasticizer becomes the most important factor that affects the construction performance of concrete. Among them, inferior auxiliary cementing materials have great influence on the compatibility between cement and superplasticizer. Sulfur fixation ash and titanium slag are all low grade auxiliary cementitious materials which need to be used urgently. Therefore, the effect of sulfur fixation ash and titanium slag composite auxiliary cementitious material on the compatibility of cement and superplasticizer is studied in this paper. Two kinds of superplasticizer, polycarboxylic acid and naphthalene, were used in the experiment. The influence of the ratio of fixed sulfur ash to titanium slag and the fineness of fixed sulfur ash on the compatibility of cement and superplasticizer was studied by means of Marsh cylinder slurry test. Then the results of Marsh tube method are evaluated quantitatively. Finally, the mechanism of the influence of sulfur fixation ash and titanium slag on the compatibility of cement and superplasticizer was investigated from the aspects of water reducing agent adsorption characteristics, slurry Zeta potential, setting time and rheological thixotropy. The results show that with the increase of the ratio of sulfur fixation ash to titanium slag, on the one hand, the consumption of superplasticizer and the rate of slurry hydration are increased, so that the saturated content of slurry, the loss rate and bleeding point are increased. On the other hand, when the ratio of sulfur fixation ash to titanium slag increases, the initial Marsh time of the slurry is prolonged by increasing the yield stress and plastic viscosity of the slurry. The grinding process reduces the particle size, destroys the pore structure and increases the particle specific surface area. Therefore, with the decrease of the fineness of sulfur fixation ash, the amount of water reducer, the yield stress and the plastic viscosity of the composite cementitious material system are all decreased, so that the Marsh time, saturated content, time loss and bleeding point of the slurry are reduced. Polycarboxylic acid superplasticizer has stronger effect on dispersing and maintaining fluidity of composite cementitious material system than naphthalene water reducer even though naphthalene water reducer can obviously increase the Zeta potential of slurry. The results of compatibility quantitative analysis and qualitative experiment show that the effect of polycarboxylic acid superplasticizer on cement paste is greatly affected by the amount of sulfur fixation ash, while the effect of naphthalene water reducing agent is greatly affected by the fineness of fixed sulfur ash. The author suggests that polycarboxylic acid superplasticizer should be used when the ratio of sulfur fixation ash to titanium slag is lower than 1 and the naphthalene series water reducer should be used when the ratio is high. Although sulfur fixation ash and titanium slag are solid wastes, they can make up for each other's weakness and can be used in cement system.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ172.1;TU528.042.2

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本文編號(hào)：1820554