CGM-320 Support Grouting Material

I. Scope of Application

CGM-320 support grouting material is used for gravity grouting of precast simply supported box girder pot-type rubber supports, cast-in-situ girder bridge pot-type rubber supports, and grouting between the bottom plate of the support and the pier bearing stone.

CGM-320 Support Grouting Material is applied to precast multi-section T-beam basin-type rubber supports.

Section II: Product Features

1. Early-stage high intensity; excellent fluidity;

2. Extended working hours; Cost-effectiveness.

3. Dense, with no shrinkage; rust-free, without metallic aggregates.

4. Easy to install; free of chlorides

III. Performance Indicators

Product Model

Performance Metrics

CGM-320 Base Grouting Material

Flow Rate (mm)

　　≥320

　　—

30-minute fluidity (mm)

　　≥240

　　—

Biomass Yield (%)

　　0

　　—

Compressive Strength (MPa)

　　2h≥20

　　8h≥25

　　28d≥50

　　28d≥50

56d is not less than 28d test results

56d is not less than 28d test results

90-day test results not less than 56-day results

Flexural Strength (MPa)

　　24h≥10

　　24h≥10

Elastic Modulus (Gpa)

　　28d≥30

　　28d≥30

28-day free shrinkage (%)

　　0.02～0.1

　　0.02～0.1

The above data were measured under standard laboratory control conditions. Unit dosage: approximately 2200 Kg/m3.

Inspection Reference: Science & Technology Base [2005] No. 101, Provisional Technical Conditions for Pot-Type Rubber Supporting Seats of Passenger Dedicated Lines Bridges

Section 4: Construction Method

1. Install the bearing at the bottom of the beam, ensuring that the centerline of the bearing aligns with the centerline of the beam's bottom plate, with no deviation exceeding 0.5mm; tighten the bearing bolts sequentially, maintaining a consistent level of tightness for each bolt; upon completion of the bolt tightening, there should be no gap between the bearing and the beam's bearing plate.

2. Install the anchor bolts into the anchor bolt holes of the bracket, with the bolts extending 0.25 times the bolt diameter beyond the nut. Secure the nut and sleeve bolts to prevent leakage at the junction of the sleeve bolt and the bracket's bottom surface.

3. Mark the longitudinal and transverse symmetrical support center lines on the bearing pad stone. Roughen the surface of the bearing pad stone, remove any debris left in the foot bolt holes, and saturate the surface of the bearing pad stone with water, but ensure no standing water during construction. Then, lay a layer of 20-30mm thick M50 rigid, non-shrinking mortar on the top of the bearing pad stone, compact it, and ensure a flat surface. Pay attention to the mortar level, considering the compression of the mortar after the beam is lowered. Remove any debris left in the foot bolt holes and, within 0 minutes of the beam being in place, pour M50 mortar into the foot bolt holes to a level 15mm below the top of the bearing pad stone.

4. The slurry should be mixed at a ratio of powder to water: 1:0.17 (by weight). First, add the water to the mixing drum, then gradually add the measured slurry material while stirring with an electric mixer. Continue to mix until all the powder is added, and then mix for an additional 2-3 minutes to ensure the slurry is evenly mixed. The mixed slurry should be poured within 25 minutes.

5. During beam placement, ensure the centerline of the support is aligned with the longitudinal and transverse symmetry centerlines of the bedding stone top support. After the beam is set, promptly cure the M50 dry, non-shrinking mortar.

6. After the grouting material in the foot bolt holes reaches the specified strength, tighten the foot bolts, remove the temporary support connection plate, and install the support sealing panel.

V. Packaging and Storage

Packaging specification: 40kg per bag, store in a well-ventilated and dry place, and prevent direct sunlight.

2. The shelf life is 6 months; products beyond the expiration date must pass a re-inspection before use.

3. Free from benzene derivatives, halogenated hydrocarbons, formaldehyde, heavy metals, and other harmful components; non-toxic, odorless, pollution-free, and harmless.

Not explosive, may be transported as general cargo.