Choosing A Vibrator Machine For Concrete

Why vibrator machine for concrete Are Used

Vibrator machine for concrete consolidate freshly placed concrete by helping en- trapped air to escape—first fr om between coarse aggregate particles and then from the mortar. As the concrete subsides, large air voids between coarse aggregate particles are filled with mortar. Then further vibration drives out most of the air, which is trapped in the mortar. Concrete doesn’t move much during the second phase, but that’s when most of the consolidation takes place.

So long as vibrator machine for concrete are operated properly and not used to move concrete later ally, consolidation enhances concrete ’s per form ance and appearance . It improves concrete ’s density, strength, and bond with reinforcing steel, and it minimizes surface blemishes. The efficiency of consolidation is related to the characteristics of the vibrator. Henan Xinsda Machinery Technology Co.,Ltd have more than 20 years of production experience. Dedicated research team and external sales team.Product quality is in a leading position in the construction machinery industry. Let our professional engineer team tell us how to choose vibrator machine for concrete.

vibrator machine

How Vibrator machine for concrete Work

Almost all internal vibrator machine for concrete are of the rotary type: Vibrating action is produced by the rotation of an unbalanced weight, called an eccentric, that’s located inside the vibrator head. As the eccentric rotates at high speed, the vibrator head moves in an orbit.  Frequency is the number of complete orbits per unit of time and am plitude is the maximum deviation from the point of rest. Frequency is usually expressed in vibrations per minute (vpm) and amplitude in inches. Most internal vibrator machine for concrete are high-frequency vibrator machine for concrete designed to operate at 9,000 to 15,000 vpm while immersed in the concrete . Amplitudes range from 0.015 to 0.08 inches.

When it’s immersed in concrete, the orbiting head strikes the concrete . The greater the amplitude, the stronger the impact, and the greater the frequency , the more impacts the concrete receives .

Amplitude primarily affects movement of coarse aggregate particles and frequency primarily affects the mortar, but amplitude and frequency are related to each  other. A vibrator with a high frequency , for example , generally has a low amplitude , since the vibrator head doesn’t

have the time to travel as far as it can at a lower frequency .

vibrator machine for concrete with higher frequencies and lower amplitudes are best suited for consolidating plastic mixes in thin sections because these mixes have a higher mortar content.

vibrator machine

Choosing  the Vibrator machine for concrete

Choosing a vibrator includes selecting the right head size, frequency, and amplitude for the job. Depending on the type of vibrator, head diameters can be as small as

3⁄4 inch or as large as 7 inches. Head diameters for flexible-shaft vibrator machine for concrete , for example, typically range from 3⁄4 inch to 2 5⁄8 inches; those for motor -in-head vibrator machine for concrete from 1 1⁄4 to 25⁄8 inches; those for flexible-hose pneumatic vibrator machine for concrete from 1 inch to 33⁄8 inches; and those for rigid-shaft pneumatic vibrator machine for concrete from 4 1⁄2 to 7 inches . Head size, frequency , and amplitude all affect the vibrator ’s radius of action—the distance fr om the vibrator head within which consolidation occurs. A larger radius of action provides more efficient operation because fewer vibrator insertions are required. Because rebar spacing, design slump ,and form dimensions can vary from one placement to another, it’s always a good idea to have more than one head diameter available on-site. Depending on job site conditions, additional performance variables to consider include the vibrator head’s shape, length, and coating. For example, the traditional vibrator head is round-shaped, but some manufacturers provide square- or hexagonal-shaped heads. Round heads radiate vibrations in concentric patterns , uniformly away from the center of the eccentric. Square heads radiate vibrations from the head ’s flat surfaces , in flat waves rather than circles.

vibrator machine

To accommodate the members found in most general construction applications , head lengths typically range from 11 to 15 inches. But some manufacturers also supply short heads of 4 inches to facilitate

the vibration of limited-depth members such as slabs or tilt up panels . Some manufacturers also offer rubber – or plastic-coated vibrator heads to help protect epoxy- coated rebar. Remember , though, that this coating adds a fraction of an inch to the head diameter

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