Intelligent evaluation method and device for vibrating compaction difficulty degree of fresh concrete

Abstract

The invention discloses an intelligent evaluation method and device for the vibrating compaction difficulty degree of fresh concrete, the device is mainly composed of a vibrating rod, a sensor, a weighing system, a control center and the like, and the using method of the device comprises the steps that the fresh concrete with the fixed mass is put into a container, the sensor is installed, a vibrator is started, and the starting time is recorded. When the compact state of concrete changes, signals received by the vibration wave signal sensors installed in the cylindrical container also change, when the change values of the signals received by the three sensors within a fixed time are all smaller than a set value, it is judged that vibration is compact, the control center automatically closes the vibrator, and the end time is recorded; and according to the vibration time, the difficulty degree of vibration compaction is evaluated. The device can evaluate the difficulty degree of vibration compaction of fresh concrete, can also provide guidance for on-site vibration construction, is simple in structure, is simple and convenient to operate, and facilitates the realization of fine control of vibration construction.

Description

technical field [0001] The invention belongs to the technical field of testing of building materials, and in particular relates to an intelligent evaluation method and device for the degree of difficulty of vibrating compaction of fresh concrete, which is suitable for the evaluation of the degree of difficulty of vibrating compaction of fresh concrete. Background technique [0002] Vibration is an important link in the concrete construction process. Through low-amplitude and high-frequency vibration, energy is transmitted to the concrete mixture, so that all particles within the vibration range are forced to vibrate. Vibration reduces the viscosity and internal friction of the concrete mixture within the effective range of the vibration, changes the fluidity of the slurry, liquefies the concrete, the aggregate particles sink and slip under the action of gravity, and the large bubbles are buoyant. Under the action, it floats up and discharges or is vibrated, so that the aggre...

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Problems solved by technology

[0004] It is a method to judge the compactness by measuring the change of concrete performance parameters under the vibrating state. The patent "a mechanical device for identifying the compactness of concrete by vibrating" evaluates the concrete by the pressure generated by the concrete around the vibrating rod compactness, but it cannot reflect the conduction and changes of vibration waves inside the concrete. "Transparent mortar mixture and its preparation method for simulating the rheological properties of cement mortar" uses transparent mortar mixture as the simulation medium of cement mortar. The density detection is carried out in a visual way, but this method can only simulate the mixture of a specific mix ratio, and the field applicability is poor

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