混凝土振動攪拌機理和工業(yè)應用研究
發(fā)布時間：2018-07-31 08:28
【摘要】：目前，原材料級配、性能及新拌混凝土成型等是國內(nèi)外有關混凝土研究的焦點，而攪拌過程卻往往被忽視和研究不夠。究其原因，主要是因為攪拌過程涉及多學科交叉領域，如攪拌設備、施工材料和生產(chǎn)工藝等，認知起來比較困難，研究過程中易相互脫節(jié)。所以，相關研究至今仍停留在宏觀尺度上。致使混凝土微觀勻質(zhì)性較差，界面粘結強度較低；攪拌工作裝置的線速度較低，攪拌時間長；攪拌過程存在速度梯度和攪拌低效區(qū)等現(xiàn)象長期得不到根本解決。本文提出利用振動與普通靜力攪拌相結合的新方法，利用動力學原理設計振動器，置于圓形拌筒的中心，振動器埋在混合料中，振動能量直接被混合料吸收。在兩種方式共同作用下，混凝土微觀結構和力學性能得以改善，攪拌設備綜合性能得以提升。 論文首先分析了新拌混凝土結構-流變特性，為確定振動攪拌設備工作機構的幾何、運動參數(shù)提供理論依據(jù)，指出各參數(shù)的選取需以保證攪拌筒內(nèi)混合料結構的完全破壞為目標；進一步分析了混凝土攪拌過程及目前普遍采用的普通靜力攪拌所存在的不足。 分六大方面，論文重點對混凝土振動攪拌方式改善攪拌過程及混凝土性能的機理進行了詳細闡述，包括：振動攪拌對混凝土結構-流變特性的影響機理；振動攪拌對新拌混凝土中水泥團粒的破壞機理；振動攪拌對新拌混凝土中粗骨料表面的凈化及其粘結強度的增強機理；振動攪拌對新拌混凝土中氣相生成物的影響機理；振動攪拌對攪拌過程—低效區(qū)的改善機理；振動攪拌對多材料的適應性機理。理論分析認為，振動攪拌可綜合提高攪拌設備及混凝土各項性能。 在理論分析的基礎上，設計了兩臺試驗樣機：振動與靜力攪拌相結合，但振動與攪拌工作裝置分離的立軸式振動攪拌機，以及振動與靜力攪拌工作裝置相結合的一體式雙臥軸振動攪拌機；進行了振動攪拌對普通混凝土、RCC、SFRC、CA砂漿等材料的適應性試驗研究。初步得出了振動攪拌各參數(shù)的合理取值及匹配關系，為振動攪拌設備的工業(yè)化提供依據(jù)。試驗結果表明：振動攪拌對多材料具有較好的適應性，，各項性能指標均優(yōu)于普通靜力攪拌；立軸振動攪拌更適宜于骨料顆粒普遍較小的CA砂漿等材料的攪拌，雙臥軸振動攪拌更適宜于較大粒徑骨料的混凝土攪拌。 在理論分析和大量試驗研究的基礎上，針對現(xiàn)行攪拌設備評定指標體系的不合理性進行了試驗證明和分析，并對修改現(xiàn)行攪拌設備評定指標提出了若干建議，給出在不同場合下需要增加的檢驗指標，旨在完善現(xiàn)行攪拌設備評定指標體系。 將理論及試驗研究成果與工業(yè)實際相結合，試制了1m3雙臥軸振動攪拌工業(yè)樣機，并進行了工業(yè)化研究。研究表明：工業(yè)樣機工作過程穩(wěn)定可靠，各項指標滿足國標要求，能耗較低，攪拌時間為45s；其他條件相同的情況下，工業(yè)樣機生產(chǎn)的混凝土比普通靜力攪拌機生產(chǎn)的混凝土強度提高15%以上，且新拌混凝土勻質(zhì)性更好；工業(yè)樣機在減少水泥15%時，混凝土性能仍滿足設計要求，節(jié)約水泥效果明顯。 本課題研究受到國家自然科學基金項目“混凝土振動拌和機理研究”（50678026）、陜西省重大科技創(chuàng)新專項資金項目“高效混凝土攪拌機的工業(yè)化研究”（2008ZKC01-16）資助。
[Abstract]:At present, the grading of raw materials, properties and the molding of fresh concrete are the focus of concrete research at home and abroad, and the stirring process is often ignored and not enough. The main reason is that the agitation process involves multi disciplinary cross fields, such as mixing equipment, construction material and production technology, which are difficult to understand and have been studied. Cheng Zhongyi is separated from each other. Therefore, the related research still remains on the macro scale. It causes the poor micro uniformity of the concrete, the low interfacial bonding strength, the low line speed of the stirring device, the long agitation time, the existence of the velocity gradient and the low efficiency agitator in the agitation process for a long time. A new method of combining vibration with static static mixing is used to design the vibrator by the principle of dynamics. The vibrator is placed in the center of the circular cylinder. The vibrator is buried in the mixture. The vibration energy is absorbed directly by the mixture. Under the joint action of the two ways, the microstructure and mechanical properties of the concrete can be improved and the comprehensive performance of the mixing equipment can be improved.
The paper first analyzes the structure and rheological properties of new mixed concrete, and provides a theoretical basis for determining the geometry and motion parameters of the working mechanism of vibratory mixing equipment, and points out that the selection of the parameters should be aimed at ensuring the complete destruction of the mixture structure in the mixing cylinder. There is a shortage of force stirring.
In six major aspects, the paper focuses on the mechanism of concrete vibration mixing to improve the mixing process and the concrete performance, including the mechanism of vibration agitation on the concrete structure and rheological properties, the destruction mechanism of the cement pellets in the fresh concrete by vibration stirring; the vibration agitation on the coarse bone in the fresh concrete The mechanism of the purification of the material surface and the strengthening of the bond strength; the mechanism of the influence of vibration agitation on the gas phase in the fresh concrete; the improvement mechanism of the stirring process - the low efficiency zone; the adaptability mechanism of the vibration agitation to the multi materials. The theoretical analysis shows that the vibration agitation can improve the various properties of the mixing equipment and the concrete. Yes.
On the basis of theoretical analysis, two test prototype is designed, which combines vibration and static mixing, a vertical vibration mixer which is separated from vibration and stirring device, as well as a one type double lying shaft vibrating mixer which combines vibration and static stirring device. The vibration agitator is used for ordinary concrete, RCC, SFRC, CA mortar. The reasonable value and matching relation of various parameters of vibration agitation are preliminarily obtained. It provides a basis for the industrialization of vibration stirring equipment. The experimental results show that vibration agitation has good adaptability to multi materials, and all performance indexes are superior to ordinary static stirring; vertical shaft vibration agitation is more suitable for bone. The stirring of materials such as CA mortar with smaller particle size is more suitable for concrete with larger particle size.
On the basis of theoretical analysis and a large number of experimental studies, this paper proves and analyzes the irrationality of the current agitator evaluation index system, and puts forward some suggestions to modify the evaluation index of the current mixing equipment, and gives the test index which needs to be increased in different situations, aiming at improving the current evaluation index body of the mixing equipment. Department.
Combining the theoretical and experimental research results with the industrial practice, the industrial prototype of 1m3 double lying shaft vibrating agitation is tried and manufactured. The research shows that the working process of the industrial prototype is stable and reliable, the indexes meet the requirements of the national standard, the energy consumption is low, the mixing time is 45s, and the industrial prototype is produced under the same conditions. The concrete strength of concrete produced by concrete is 15% higher than that of ordinary static mixer, and the homogenization of new concrete is better. The performance of concrete is still satisfied with the design requirement and the effect of cement saving is obvious when the industrial prototype can reduce the cement 15%.
The research is funded by the National Natural Science Fund Project "Research on the mixing mechanism of concrete vibration" (50678026) and the capital project of the major scientific and technological innovation of Shaanxi Province, "the industrialization of high efficiency concrete mixer" (2008ZKC01-16).
【學位授予單位】：長安大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU642;TU528.062
本文編號：2155010
[Abstract]:At present, the grading of raw materials, properties and the molding of fresh concrete are the focus of concrete research at home and abroad, and the stirring process is often ignored and not enough. The main reason is that the agitation process involves multi disciplinary cross fields, such as mixing equipment, construction material and production technology, which are difficult to understand and have been studied. Cheng Zhongyi is separated from each other. Therefore, the related research still remains on the macro scale. It causes the poor micro uniformity of the concrete, the low interfacial bonding strength, the low line speed of the stirring device, the long agitation time, the existence of the velocity gradient and the low efficiency agitator in the agitation process for a long time. A new method of combining vibration with static static mixing is used to design the vibrator by the principle of dynamics. The vibrator is placed in the center of the circular cylinder. The vibrator is buried in the mixture. The vibration energy is absorbed directly by the mixture. Under the joint action of the two ways, the microstructure and mechanical properties of the concrete can be improved and the comprehensive performance of the mixing equipment can be improved.
The paper first analyzes the structure and rheological properties of new mixed concrete, and provides a theoretical basis for determining the geometry and motion parameters of the working mechanism of vibratory mixing equipment, and points out that the selection of the parameters should be aimed at ensuring the complete destruction of the mixture structure in the mixing cylinder. There is a shortage of force stirring.
In six major aspects, the paper focuses on the mechanism of concrete vibration mixing to improve the mixing process and the concrete performance, including the mechanism of vibration agitation on the concrete structure and rheological properties, the destruction mechanism of the cement pellets in the fresh concrete by vibration stirring; the vibration agitation on the coarse bone in the fresh concrete The mechanism of the purification of the material surface and the strengthening of the bond strength; the mechanism of the influence of vibration agitation on the gas phase in the fresh concrete; the improvement mechanism of the stirring process - the low efficiency zone; the adaptability mechanism of the vibration agitation to the multi materials. The theoretical analysis shows that the vibration agitation can improve the various properties of the mixing equipment and the concrete. Yes.
On the basis of theoretical analysis, two test prototype is designed, which combines vibration and static mixing, a vertical vibration mixer which is separated from vibration and stirring device, as well as a one type double lying shaft vibrating mixer which combines vibration and static stirring device. The vibration agitator is used for ordinary concrete, RCC, SFRC, CA mortar. The reasonable value and matching relation of various parameters of vibration agitation are preliminarily obtained. It provides a basis for the industrialization of vibration stirring equipment. The experimental results show that vibration agitation has good adaptability to multi materials, and all performance indexes are superior to ordinary static stirring; vertical shaft vibration agitation is more suitable for bone. The stirring of materials such as CA mortar with smaller particle size is more suitable for concrete with larger particle size.
On the basis of theoretical analysis and a large number of experimental studies, this paper proves and analyzes the irrationality of the current agitator evaluation index system, and puts forward some suggestions to modify the evaluation index of the current mixing equipment, and gives the test index which needs to be increased in different situations, aiming at improving the current evaluation index body of the mixing equipment. Department.
Combining the theoretical and experimental research results with the industrial practice, the industrial prototype of 1m3 double lying shaft vibrating agitation is tried and manufactured. The research shows that the working process of the industrial prototype is stable and reliable, the indexes meet the requirements of the national standard, the energy consumption is low, the mixing time is 45s, and the industrial prototype is produced under the same conditions. The concrete strength of concrete produced by concrete is 15% higher than that of ordinary static mixer, and the homogenization of new concrete is better. The performance of concrete is still satisfied with the design requirement and the effect of cement saving is obvious when the industrial prototype can reduce the cement 15%.
The research is funded by the National Natural Science Fund Project "Research on the mixing mechanism of concrete vibration" (50678026) and the capital project of the major scientific and technological innovation of Shaanxi Province, "the industrialization of high efficiency concrete mixer" (2008ZKC01-16).
【學位授予單位】：長安大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU642;TU528.062
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本文編號：2155010
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