METHOD STATEMENT FOR CONCRETE REPAIRING WORK

The purpose of this method is to describe the methodology involved in construction work for tMETHOD STATEMENT FOR CONCRETE REPAIRING WORK and to detail out the steps to be taken in order to meet the technical requirements of VP1 BOT Thermal Power Plan

Project Title Van Phong 1 BOT Thermal Power Plant Project

Document Title METHOD STATEMENT FOR CONCRETE

REPAIRING WORK

Document Type For Approval

Document No VP1-0-L4-C-GEN-10025 Returned Status NA Prepared by L4

CRS No VP1-0-L4-C-GEN-10025-A-CRS CRS Issued Date 13/05/2020 Engineer Construction

No Section/

Page

Date

Status O/C * Remarks

1 3 Supplement item "Classification of the concrete

defects and its reason" so that can propose a proper repair method (Voids, Honeycomb, Scaling, Crack, Cold joint, Damaged)

2 3 Before stepping the repair procedure for each

defect, please provide summary table as below

3 4 It needs to be assessed if there is any other

underlying damage before the repair methods described in this document can be applied

Lot4 will proposal method case by case specifically and addition in revision B

Page 2 of 3

8 5 Not agreed since consider the material strength in

case air void is serious

Lot4 change material as revision B 13/05/2020 O

9 5 Cement slurry will make crack due to strong

shrinkage, recommend to use Sika Refit 2000 or cement mortar with Sika latex

Lot4 will use Sika Refit 2000 or GPS mota 16 13/05/2020 O

10 5 Specify maximum depth of chipping for which this

treatment can be applied

Maximum depth of chipping for this treatment is 20mm

11 6 Specify maximum depth of chipping for which this

treatment can be applied What will be done if the reinforcement bars are reached/exposed?

Maximum depth of chipping for this treatment is 50mm

12 6 Before apply Monotop R, recommend to use Monotop

610 as primer layer

13 6 Before any remedial measure the cause of the

crack needs to be assessed

14 7 Missing method to repair crack for the floor for

example in building floor when through crack

Base on assessed actual reason and width of crack Lot4 will propose method for case by case specification

15 8 Water leak test is needed after treatment Please

add

16 11 Supplement repair method for Scaling concrete,

Cold joint and Damaged

17 11 It needs to be checked if the reinforcement bars

have moved so that they might be closer to the repaired surface than the prescribed cover

Unsuitable placement of reinforcement might require more extensive repair including complete removal and reconstruction

Lot4 noted and addition in revision B 13/05/2020 O

Additional Notes (if any)

* O - Open, C – Closed

METHOD STATEMENT FOR CONCRETE REPAIRING WORK

EPC

Doosan Heavy Industries and Construction

EPC DOCUMENT No

Contractor to revise the correction and resubmit

Revise the correction and resubmit before proceeding

Information acknowledged with no comment

Information acknowledged with comments Note: Approval or comment does not relieve the Contractor of

B

Revise material according

to item 5.1; 5.2

B

B

B