本文關(guān)鍵詞： 石灰石粉 復(fù)合膠凝粉體材料 顆粒級(jí)配設(shè)計(jì) 最佳堆積密度 粒度分布 活性指數(shù) 流動(dòng)度　出處：《湖南大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：石灰石粉作為一種普遍而廉價(jià)的材料,其在復(fù)合膠凝材料中的合理應(yīng)用,不僅能夠很好地緩解當(dāng)前粉煤灰等傳統(tǒng)摻合料日益緊缺的現(xiàn)狀,甚至能夠成為功能性組分,解決一些地方性摻合料單摻時(shí)在流動(dòng)性能等方面存在的缺陷與問(wèn)題。因此,從當(dāng)下愈發(fā)受到重視的顆粒級(jí)配角度出發(fā),研究石灰石粉在不同水泥基粉體膠凝體系中的復(fù)合應(yīng)用特點(diǎn),從而具有一定普適性且較大程度地實(shí)現(xiàn)石灰石粉的有效利用,意義重大。本文將粉體顆粒級(jí)配作為主要側(cè)重點(diǎn),嘗試將石灰石粉作為功能性組分進(jìn)行復(fù)合利用,通過(guò)引入級(jí)配參數(shù),研究石灰石粉在幾種復(fù)合膠凝體系中的應(yīng)用特點(diǎn)及作用機(jī)理。結(jié)合實(shí)際項(xiàng)目,分別選取分布較為廣泛的天然火山灰與自燃煤矸石作為復(fù)合組分,嘗試從顆粒級(jí)配角度最大化發(fā)揮石灰石粉的性能特點(diǎn),以解決這些地方性摻合料單摻時(shí)存在的問(wèn)題,并取得了良好的效果。另一方面,將石灰石粉與超細(xì)粉煤灰和硅灰復(fù)合使用,依托Fuller曲線(xiàn)模型設(shè)計(jì)體系顆粒級(jí)配,通過(guò)達(dá)到最佳堆積密度來(lái)最大化發(fā)揮石灰石粉在顆粒填充方面的優(yōu)勢(shì),最終成功配制出強(qiáng)度及流動(dòng)性能良好且較為經(jīng)濟(jì)的高性能復(fù)合摻合料。通過(guò)本文的研究得出:(1)在石灰石粉-天然火山灰復(fù)合體系中,保證充足的石灰石粉細(xì)顆粒含量以增大顆粒堆積密度十分重要。顆粒級(jí)配設(shè)計(jì)結(jié)果表明,復(fù)合粒度分布與水泥基本相同的天然火山灰以及細(xì)顆粒含量較高的石灰石粉最為適宜,能夠在保證粉磨能耗成本經(jīng)濟(jì)性的同時(shí),使體系性能得到較大程度的提高。(2)復(fù)合一部分粒度分布適宜的石灰石粉能夠很好地解決自燃煤矸石單摻時(shí)流動(dòng)性能較差的問(wèn)題。其中,復(fù)摻細(xì)顆粒含量較高的石灰石粉以愈發(fā)接近Fuller曲線(xiàn)的級(jí)配要求,流動(dòng)性能越好。顆粒級(jí)配設(shè)計(jì)結(jié)果顯示,復(fù)合中粒徑D50為水泥0.75倍的自燃煤矸石以及D50為基準(zhǔn)水泥0.348倍的石灰石粉,能夠較好地發(fā)揮物理顆粒填充效應(yīng),使復(fù)合體系膠砂性能得到較大程度的優(yōu)化。(3)在石灰石粉-超細(xì)粉煤灰-硅灰復(fù)合體系中,對(duì)水吸附性較小的石灰石粉在體系顆粒級(jí)配方面所發(fā)揮的填充作用相比材性更為重要,因此在定量硅灰等一些材性影響較大的組分后,根據(jù)石灰石粉的粒度分布,依托Fuller曲線(xiàn)最終確定出最接近體系最佳堆積密度的粉體復(fù)合比例,這種設(shè)計(jì)手段對(duì)于石灰石粉在該復(fù)合體系中的應(yīng)用是十分可行的。(4)從顆粒級(jí)配角度出發(fā),將石灰石粉作為功能性組分進(jìn)行復(fù)合利用,用來(lái)解決一些地方性摻合料單摻時(shí)存在的缺陷或替代一部分價(jià)格較高的活性組分是十分可行的。在復(fù)合利用石灰石粉時(shí),更應(yīng)該以整個(gè)粉體體系盡可能達(dá)到最佳堆積密度為目的,將其粒度分布的選擇設(shè)計(jì)作為實(shí)際應(yīng)用的關(guān)鍵。
[Abstract]:As a universal and cheap material, the reasonable application of limestone powder in composite cementitious materials can not only alleviate the current situation of increasing shortage of traditional admixtures such as fly ash. It can even become a functional component to solve some local admixtures in the flow performance of the defects and problems. Therefore, from the point of view of more and more attention to particle gradation. The composite application characteristics of limestone powder in different cement-based powder cementing systems are studied, so that the limestone powder can be widely used to a certain extent. In this paper, the gradation of powder particles as the main focus, try to use limestone powder as a functional component for composite use, through the introduction of gradation parameters. The application characteristics and mechanism of limestone powder in several kinds of composite cementing systems were studied. Combined with practical projects, natural volcanic ash and spontaneous combustion coal gangue, which were widely distributed, were selected as composite components respectively. This paper tries to maximize the performance characteristics of limestone powder from the angle of particle gradation, in order to solve the problems existing in the single blending of these local admixtures, and obtain good results on the other hand. Limestone powder was combined with ultrafine fly ash and silica fume to design particle gradation based on Fuller curve model. In order to maximize the advantages of limestone powder in particle filling, the best packing density can be achieved. Finally, the high performance compound admixture with good strength and flow performance was prepared successfully. Through the research of this paper, it was concluded that the composition of limestone powder and natural pozzolanic ash was in the composite system of limestone powder and natural pozzolanic ash. It is very important to ensure sufficient fine particle content of limestone powder in order to increase the density of particles. The results of particle gradation design show that. The composite particle size distribution is basically the same as cement natural pozzolanic ash and limestone powder with high content of fine particles is the most suitable, which can ensure the cost and economy of grinding energy consumption at the same time. The composite limestone powder with proper particle size distribution can solve the problem of poor flow performance of spontaneous combustion gangue when it is mixed with coal gangue. The fluidity of limestone powder mixed with high content of fine particles is closer to the requirement of Fuller curve. The results of particle gradation design show that the fluidity of limestone powder is better than that of Fuller curve. The self-ignition coal gangue with the particle size D50 of 0.75 times of cement and the limestone powder with D50 of 0.348 times of the benchmark cement can play a better role in the filling effect of physical particles. The cemented sand properties of the composite system can be optimized to a greater extent in the limestone powder-ultrafine fly ash-silica fume composite system. Limestone powder with less water absorbability plays a more important role in filling the particle gradation of the system than the wood property, so after the quantitative silica fume and other material properties of some more important components. According to the particle size distribution of limestone powder, the composite ratio of powder closest to the best packing density of the system was finally determined by Fuller curve. This design method is very feasible for the application of limestone powder in the composite system. It is very feasible to solve the defects of some local admixtures or to replace some expensive active components. The best packing density of the whole powder system should be taken as the goal, and the selection and design of the particle size distribution should be regarded as the key point of practical application.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU526

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