| Research |
Grouting of Sheet Pile Joints |
|
| |
| Method Statement for Bentonite-Cement Grouting of Sheet Pile Joints (Continued) |
| page 1 | page 2 | page 3 |
| |
| 3.2 Materials |
| |
| The grout shall consist of a mix of cement, bentonite and water in the proportions specified by the Engineer within the limits set in Section 4.0 |
|
| Material |
Description |
| Bentonite |
Some bentonite (10 percent) shall be added to neat cement grout to provide a colloidal mixture (25kg/bag). |
| Cement |
A Portland cement, supplied in bags in a dry unhardened state (50kg/bag). |
|
| Water |
Clean fresh water free from salt, oil or other impurities. |
|
|
| |
|
| |
| 4.0 MIX DESIGN |
| |
| The mixture to be used shall strictly follow the following proportions; |
| |
| Material |
Component Batch Quantity |
| Cement |
1 bag - 50kg (Quantity A). |
| Bentonite |
10% by weight of Quantity A - 5kg. |
|
| Water |
1 : 0.9 ratio cement : water - 45 liters. |
|
|
| |
| The fluidity of the grout slurry shall be measured during the field mixing. As part of the Quality Control, the Flow Cone Test shall be carried out at least three times per day to confirm the conclusion of the initial field test for the actual materials in use. Please refer to Appendix A for the testing procedure.
If there is a break in the continuity of discharge prior to essential emptying of the cone, it is an indication that the grout is too thick to be properly tested for flow. Then the personnel in-charge on site shall monitor from time to time the mixing ratio of the above mentioned to ensure the quality of mixing. |
| |
| 5.0 CLEANING OUT |
| |
- The interlocking track is fitted with an end plate to limit entry of soil into the track's slot during driving and also to prevent any possibility of over flushing into a deeper level during the cleaning process.
- The flushing shall be carried out using the poly pipe with the dimension of 1.0" in diameter with length not shorter than 6.5m. The main advantage for using poly pipe will be the high flexibility that allows pipe to penetrate as deep as possible into the driven clutch.
- With assistance from the water pump, all the debris shall be removed from the full length (6m) of the joint chamber before any grout is placed in the joint chamber. During cleaning, the wash pipe will be lifted up and down to break up and wash off the soil from clutch. Cleaning out shall be continued from bottom up until the mud stop flowing out together with water from the sheet pile clutch.
- After clean out, the joint chamber shall be checked for soil and mud before filling with grout. Checking of an open chamber with a weighted line in 6.0m length shall be one of the most effective means of inspection.
|
| |
| page 1 | page 2 | page 3 |
| |
