本文選題：超高強(qiáng)混凝土 + 鎳鐵合金渣��； 參考：《中國(guó)礦業(yè)大學(xué)》2014年碩士論文

【摘要】：超高強(qiáng)高性能混凝土自問(wèn)世以來(lái)，憑借優(yōu)異的力學(xué)性能、工作性能和耐久性能，在世界各地得到了廣泛的重視和研究。但傳統(tǒng)的超高強(qiáng)混凝土水泥用量較大，往往使用價(jià)格昂貴的原材料，且制備和施工工藝復(fù)雜，這都影響了其在工程上的推廣應(yīng)用。 本文運(yùn)用常規(guī)混凝土制備工藝，采用礦物摻合料（硅灰，礦粉，鎳鐵粉，粉煤灰等）復(fù)摻，配以形貌狀態(tài)良好的粗細(xì)骨料，配制出了大混合材摻量（等量取代水泥50%以上）、高強(qiáng)度（120MPa以上）、高工作性（坍落度200mm以上）、低成本的超高強(qiáng)混凝土。 通過(guò)復(fù)摻礦物摻合料的凈漿和膠砂試驗(yàn)，研究了各因素下超高強(qiáng)膠凝材料的抗壓強(qiáng)度和流動(dòng)性能，并對(duì)相關(guān)機(jī)理進(jìn)行了分析；在此基礎(chǔ)上，研究了普通細(xì)集料混凝土和鎳鐵合金渣混凝土的抗壓強(qiáng)度影響因素，對(duì)比了兩者的工作性能，最后分析了超高強(qiáng)混凝土配制成功的原因。研究結(jié)果表明，大混合材復(fù)配的膠凝材料后期強(qiáng)度能超過(guò)純水泥強(qiáng)度，可進(jìn)行超高強(qiáng)混凝土的配制；鎳鐵合金渣混凝土比普通細(xì)集料混凝土具有流動(dòng)性優(yōu)勢(shì)，在低水膠比下能密實(shí)成型，達(dá)到更高的強(qiáng)度。 通過(guò)測(cè)定化學(xué)結(jié)合水量分析了超高強(qiáng)混凝土膠凝材料的水化程度，采用XRD衍射分析法和SEM掃描電鏡法對(duì)超高強(qiáng)混凝土的微觀性能進(jìn)行了研究。研究結(jié)果表明，，在低水膠比下，大摻量礦物摻合料膠凝材料的水化程度不高。硅灰和礦粉早期活性較高，促進(jìn)水化能力較強(qiáng)，粉煤灰后期有較大的促進(jìn)水化作用，而鎳鐵粉活性則一直較弱，無(wú)明顯的促進(jìn)水化作用；鎳鐵合金渣主要礦物組成為輝石和鐵鎂橄欖石，不具備水化活性。鎳鐵合金渣超高強(qiáng)混凝土的骨料與漿體之間連接緊密，過(guò)渡區(qū)無(wú)明顯的Ca(OH)2晶體，而是被C-S-H凝膠包裹，界面特性與普通混凝土相比有極大的改善。
[Abstract]:Ultra high strength and high performance concrete (UHHPC) has received extensive attention and research in the world because of its excellent mechanical properties, working properties and durability. However, the traditional ultra-high strength concrete cement often uses expensive raw materials, and the preparation and construction technology is complex, which affects its popularization and application in engineering. In this paper, using conventional concrete preparation technology, mineral admixtures (silica fume, ore powder, nickel iron powder, fly ash, etc.) are mixed with coarse aggregate with good morphology. The superhigh strength concrete with large mixing amount (equal amount replacing more than 50% cement), high strength (above 120MPa), high workability (slump above 200mm, low cost) was prepared. The compressive strength and fluidity of ultra-high strength cementitious materials under various factors were studied through the tests of cement paste and cement sand mixed with mineral admixtures, and the related mechanism was analyzed. The factors affecting the compressive strength of ordinary fine aggregate concrete and Ni-Fe alloy slag concrete are studied. The working performance of the two concrete is compared. Finally, the reasons for the success of superhigh strength concrete preparation are analyzed. The results show that the post-strength of the compound cementing material of large mixing material can exceed the strength of pure cement, and the superhigh strength concrete can be prepared, and the Ni-Fe alloy slag concrete has the advantage of fluidity over ordinary fine aggregate concrete. At low water binder ratio can be compacted to achieve higher strength. The hydration degree of super high strength concrete cementitious material was analyzed by measuring chemical binding water. The microcosmic properties of super high strength concrete were studied by XRD diffraction and SEM scanning electron microscopy. The results show that the hydration degree of the cementing material with large amount of mineral admixture is not high at low water / binder ratio. The activity of silica fume and mineral powder in the early stage is higher and the hydration ability is stronger than that in the later stage of fly ash, while the activity of Ni-Fe powder is always weak and has no obvious effect on hydration. The main mineral composition of Ni-Fe alloy slag is pyroxene and ferric forsterite, which have no hydration activity. The superhigh strength concrete of Ni-Fe alloy slag has a close connection between the aggregate and the paste, and there is no obvious Ca(OH)2 crystal in the transition zone. Instead, it is wrapped in C-S-H gel, and the interfacial characteristic is greatly improved compared with the ordinary concrete.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528

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