Stabilized soil mixer is a complete set of special equipment for continuous mixing of pavement base materials. It is suitable for grassroots construction of ordinary highways, highways, highways, urban roads, sports fields and airports. At present, the cement content of the cement stabilized soil base mixture is generally about 5%, while the mixing of the mixture in the mixer for about 10s, it is difficult to make the mixture,Industrial Mixer especially the cement to be fully stirred. In order to ensure the use of strength, the actual production of cement content generally take the upper limit, which led to grass-roots pavement prone to cracks; but if the cement content to take a small value, will be due to uneven mixing lead to low strength of the mixture, local subsidence phenomenon.
Vibration stirring is one of the effective methods to strengthen the mixing process. As early as the 20th century, 30 years, foreign scholars will vibration and stirring technology used in cement concrete mixing test. Subsequently, the domestic scholars also launched a vibration mixing technology related research. A number of studies at home and abroad confirm that vibration agitation can significantly improve the micro-homogeneity of concrete and improve the strength and durability of concrete. In the construction of road construction,Industrial Mixer the stability of the stability of the soil directly affect the quality of road construction. Therefore, based on the stabilized soil forced mixing technology, this paper designs and manufactures the stabilized soil vibration mixer with 600t · h-1 as the vibration activating source, and compares it with the industrial experiment with ordinary forced stirring.
Vibration stir "is the name of a stirring in the same time by means of additional vibration to strengthen the stirring means of the mixing process due to the presence of vibration, so that the mixture in a constant state of tremor, increasing the number of effective collision between particles, The hydration reaction of the cement particles improves the strength of the mixture.In addition, the cohesion and the internal friction force of the mixture are reduced due to the vibration action, and the shear and convection effects of the mixing device , Reducing the mixing resistance, improve the mixing efficiency and the stability of the mixing process.At the same time, the vibration of the aggregate surface also has a certain cleaning function, to strengthen the cement paste and aggregate between the bonding effect.
The structure and main performance parameters of industrial prototype
Industrial prototype is based on the existing continuous double horizontal shaft stabilized soil mixer, the mixing device as a vibration activation source, the use of forced mixing and vibration strengthening method of combining the design and manufacture of Industrial Mixer vibration mixer industrial prototype.
Prototype working principle
The stirring device of the prototype is driven independently by the double motor, and then the synchronous gear is used to synchronize the reverse operation through the synchronous gear through the gear reducer, and the mixing device is put into the mixing tank. At the same time, the vibration transmission device adopts double The motor is driven independently and is transmitted to the exciter by means of a belt drive, which is directly connected to the agitator and transmits the vibration directly to the agitator so that both the stirring shaft, the stirring arm and the stirring blade vibrate, Stirring device forced mixing at the same time, also continue to accept the vibration effect, so that more fully stirred to improve the macro and micro uniformity of the mixture.
The main features of the industrial prototype are: the whole mixing device as a vibration activation source, stirring while stirring vibration, effective vibration area, only a small vibration intensity can make the mixture to get enough vibration to improve the The reliability of the machine.
Mixing station structure and technological process
Mixing station structure
Henan Province is a Industrial Mixer mixing plant to transform, in the original equipment to retain the basis of the ordinary Industrial Mixer mixer replacement for the stability of soil vibration mixer industrial prototype, including the ingredients unit, control room, aggregate belt conveyor, Industrial Mixer vibration mixer industrial prototype, powder tank, finished goods belt conveyor, storage hopper and so on.
Mixing station process
The batching unit shall independently measure the aggregate of different particle size according to the grading requirements, and then deliver the measured aggregate to the stabilized soil vibration mixer through the aggregate belt conveyor. At the same time, the screw conveyor will powder The powder in the tank is transported to the industrial prototype. The water supply system also pumps the measured water into the industrial prototype. All the materials are continuously from the inlet to the discharge port in the industrial prototype, accepting the dual effect of forced stirring and additional vibration. The stirred mixture is conveyed into the finished material storage hopper through the conveyor belt conveyor below the outlet of the mixing tank for loading and transporting the transport vehicle to the site. All of the above control and feedback signals are controlled by the control system.
Mixing quality comparison
Industrial prototype stirring drive and vibration drive are used independent drive mode, so the prototype itself has two kinds of mixing mode: one is only open the stirring drive, then the prototype into the ordinary forced mixing mode; the other is to open the same time driving and vibration Drive, then the prototype into the forced mixing and additional vibration combined with the vibration mixing mode. Therefore, only one industrial prototype can be used to complete the two kinds of mixing mode of the comparative test, with a simple test, the device investment is small, the results of comparative data and other advantages.
After the transformation of a site with the construction of the mix ratio: 9.5 ~ 31.5mm gravel 30%, 9.5 ~ 19mm gravel 25%, 4.75 ~ 9.5mm gravel 15%, 30% of stone, water content of 4.5%. The two kinds of stirring modes were compared with the ordinary forced stirring and vibration stirring under the condition of 5% cement content, and the "cement reduction" test was carried out when the cement content was 4%. After the end of the test, in the laboratory according to "highway pavement construction technology specification" (JTJ037-2000) requirements for 7d unconfined compressive strength test.
It can be seen that when the cement content is 5%, the average value of unconfined compressive strength is 4.73MPa for 7 days of ordinary forced stirring sample, and the average value of unconfined compressive strength is 5.27MPa for 7 days. Stirring increased by 11.4%, and the data variance is small, the sample strength stability is good, stirring more uniform.
When the cement content is 4%, the mean value of unconfined compressive strength is 4.25MPa, and the average strength of ordinary forced agglomeration decreases by 10.15% and the variance of data is the same when the cement content is 5% The strength stability of the sample is similar.
According to the technical specifications of the existing highway pavement construction, it can be seen that the compressive strength of the grassland is 3 ~ 5MPa for the expressway and the primary highway with high road quality, so the cement content is still reduced to 4%.
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