【摘要】：雙臥軸攪拌機存在混凝土容易抱軸結(jié)塊、攪拌低效區(qū)、料流運動不暢等問題，嚴重地影響了攪拌設(shè)備的作業(yè)質(zhì)量和效率。為了解決這些問題，新型的雙螺旋軸攪拌機在雙螺帶攪拌機的基礎(chǔ)上，去除中間攪拌臂，只保留兩邊攪拌臂，用兩個半軸代替橫通的攪拌軸，添加中間連接塊，形成了特殊的“無軸”攪拌結(jié)構(gòu)，不會產(chǎn)生混凝土的結(jié)塊抱軸現(xiàn)象，混凝土投放量增大，物料的運動較為流暢。 本文利用設(shè)計的雙螺旋軸攪拌機試驗樣機，研究了雙螺旋攪拌機攪拌C60高強混凝土?xí)r，采用一次投料法、先拌水泥砂漿法和水泥裹砂石法三種不同攪拌工藝對混凝土性能的影響，在理論分析和實驗研究的基礎(chǔ)上，確定不同攪拌工藝下的較佳參數(shù)，并通過對比分析得出較優(yōu)的攪拌工藝。結(jié)果表明，與其它兩種攪拌工藝相比，采用先拌水泥砂漿法攪拌C60高強混凝土?xí)r，能有效改善混凝土界面過渡區(qū)結(jié)構(gòu)，提高混凝土的強度和均勻性，同時可以減少攪拌時間，降低能耗，提高生產(chǎn)率。 為了進一步確定雙螺旋軸攪拌機攪拌C60高強混凝土的可行性及攪拌質(zhì)量，進行了雙螺旋軸攪拌機與不同機型對比試驗。對比試驗結(jié)果表明：三種不同攪拌工藝下，雙螺旋軸攪拌機攪拌出的C60高強混凝土具有較低的混凝土含氣量；采用一次投料法和先拌水泥砂漿法時，雙螺旋軸攪拌機攪拌出的混凝土具有更好的勻質(zhì)性，攪拌過程更節(jié)能、高效；采用水泥裹砂石法時，葉片帶孔的雙臥軸攪拌機攪拌質(zhì)量與雙螺旋軸攪拌機不相上下�？紤]到實際生產(chǎn)條件，建議使用雙螺旋軸攪拌C60高強混凝土，并采用先拌水泥砂漿法。
[Abstract]:There are some problems in double horizontal shaft mixer, such as easy caking of concrete, low efficiency zone of mixing, poor movement of material flow and so on, which seriously affect the working quality and efficiency of mixing equipment. In order to solve these problems, the new double spiral shaft mixer, on the basis of the double screw belt mixer, removes the middle mixing arm, preserves only the two sides of the mixing arm, replaces the transverse mixing shaft with two half shafts, and adds the intermediate connecting block. A special "shaft-free" mixing structure is formed, which does not produce the phenomenon of caking and holding the shaft of concrete, the amount of concrete is increased, and the movement of materials is more smooth. In this paper, the single feeding method is studied when the C60 high strength concrete is mixed with the double spiral mixer by using the designed experimental prototype of the double spiral shaft mixer. On the basis of theoretical analysis and experimental study, the better parameters under different mixing processes are determined on the basis of theoretical analysis and experimental research on the effects of three different mixing processes on the performance of concrete. Through comparative analysis, the better mixing process is obtained. The results show that compared with the other two mixing processes, when C60 high strength concrete is mixed with cement mortar method, the structure of interface transition zone can be effectively improved, the strength and uniformity of concrete can be improved, and the mixing time can be reduced at the same time. Reduce energy consumption and improve productivity. In order to further determine the feasibility and mixing quality of C60 high strength concrete mixed with double spiral shaft mixer, the comparative test between double spiral shaft mixer and different models was carried out. The comparative test results show that the C60 high strength concrete mixed with double spiral shaft mixer has lower gas content of concrete under three different mixing processes. When the primary feeding method and the first mixing cement mortar method are used, the concrete mixed by the double spiral shaft mixer has better homogeneity, and the mixing process is more energy-saving and efficient. When cement sand wrapping method is used, the mixing quality of double horizontal shaft mixer with holes is as good as that of double spiral shaft mixer. Considering the actual production conditions, it is suggested that C60 high strength concrete should be mixed with double spiral shafts and cement mortar method should be adopted.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU755

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