Multiquip MGX manual General information, Why vibrate concrete, Consolidation, Vibration time

general information

The MGX Vibrator has a double-insulated motor (no ground necessary) with advanced and user-friendly design. The motor is lightweight and durable with an aluminum motor case. The frontend closed-motor design prevents any invasion of mortar and foreign material from the front.

Vibration-dampening handle grip reduces operator fatigue.

Original cord protector gives flexibility to input cord for longer cord life.

Multiquip's shaft/heads are designed to work in medium to high slump concrete. Typical applications include small pours, slabs driveways, stem walls and footings.

A vibrating steel head is attached to one end of the flexshaft. This head generates vibration via an eccentric rotator that consolidates the concrete by removing air pockets. The round head design allows for the transmission of vibration in all directions.

Why vibrate concrete

To ensure optimum strength and durability, vibration of fresh concrete is an important requirement. Vibration or compaction is the principal method for consolidation of concrete.

Consolidation

Consolidation eliminates pockets of aggregate and air bubbles maximizing strength, eliminating surface voids. Vibrators consolidate concrete by transmitting shock waves which allow the aggregate to float freely while pushing lighter trapped air up and out of the concrete mix.

A properly consolidated concrete pour will display a thin line of mortar appearing along the form near the vibrator and the coarse aggregate has been dispersed evenly throughout the pour and is not visible.

vibration time

Vibration time depends on frequency. The higher the frequency, the less vibration time is required for the job.

vibration range

Vibration range (Figure 2) can be defined as "Area of Influence". This area of influence (vibrating radius) is the distance from the center of the vibrator to the outer most edge.

AREA OF INFLUENCE (VIBRATING RADIUS)

R

D

VIBRATOR HEAD

INSERTION SPACING

Figure 2. Vibrator Radius/Spacing

Table 4 shows the vibration radius and spacing for a given vibrator head diameter.

	Table 4. Vibrating Radius/Insertion
		Spacing
			Vibration	Vibrator
120 Volt	240 Volt	HeadDia.	Radius	Spacing
Models	Models	in. (mm)#	(R) in.	(D) in.
			(mm)	(mm)
MGX12325	MGX22325	.9 (23)	4 (102)	6 (152)
MGX12810	MGX22810	1.1 (28)	5.5 (140)	8.25 (210)
MGX12825	MGX22825	1.1 (28)	5.5 (140)	8.25 (210)
MGX13225	MGX23225	1.25 (32)	8 (203)	12 (305)
MGX13810	MGX23810	1.5 (38)	12 (305)	18 (427)
MGX13825	MGX23825	1.5 (38)	12 (305)	18 (427)

NOTICE

Radius (area of influence R) and vibrator head spacing (D) are expressed in inches/millimeters. Radius and distance values expressed in Table 4 are only to be used as a general guide. Values are subject to change.

page 12 — MGX Series • operation and parts manual — rev. #0 (03/26/12)