Biện pháp thi công Hardener nhà cao tầng

18-May-19 He Wei We would like to submit Method Statement of Hardener application at Parking Lot, Drive Way, Passage, Ramp Dear Sirs, Method Statement of Hardener application at Parkin

Form FEV-RFI-V1.1

RFA Ref No :

:

:

DESCRIPTION:

REPLY:

Signed:

Approved with comments but works can proceed on site

Please review and approve.

Regard,

This review is for conformance with the general design concept and for general arrangement expressed in the documents.  Review shall not be construed to mean that the reviewer accepts the  detail calculations and dimensions shown in the shop drawings or any deviation from the requirements of the contract documents.  Contractor is responsible for errors or omissions in the shop  drawings; for meeting all requirements of the contract documents; for confirming and correlating job site dimensions; for information that pertains solely to fabrication process or to techniques of  construction, and for the coordination of the work of all trades. It is understood that the notation on the submittal is not to be construed as an authorization for additional work or additional cost.

18-May-19

He Wei

We would like to submit Method Statement of Hardener application at Parking Lot, Drive Way, Passage, Ramp

Dear Sirs,

Method Statement of Hardener application at Parking Lot, Drive Way, Passage, Ramp

18-May-19 Attention

Dang Thanh Sang

Le Dinh Luong, Nguyen Trung Hau Name:

Subject

FEV-CSCEC32-ARCHI-MOS-RFA-037B - Method Statement of Hardener application at Parking Lot, Drive Way, Passage, Ramp

REQUEST FOR APPROVAL (RFA)

To VINAQS CO., LTD ;

RSP ARCHITECTS PLANNERS &

ENGINEERS (Vietnam) LTD THAM & WONG CO.,LTD

Critical (03 days)

 Norm al (07 days)

RSP reply 17 Jun 2019

In principal no objection, subject to actual results on site.

Comments:

1-This no objection is applied for Method Statement of Hardener application at Parking Lot, Drive Way, Passage way Ramp is excluded Contractor shall submit separately with clear description on MOS for ramp

2-Contractor to seek for T&W comments in terms of top-up concrete casting & bonding with existing concrete slab (if any)

3-Our no objection reply does not relieve Contractors from their responsibilities stated in Contract.

Le Dinh Luong

Description for method of concrete topping and hardener applying to ramp is not clear As discussed via phone 17 Jun 2019, CC32 will submit it separately in another MOS.

Form FEV-RFI-V1.1

RFA Ref No :

:

:

DESCRIPTION:

REPLY:

Signed:

Approved with comments but works can proceed on site

Please review and approve.

Regard,

This review is for conformance with the general design concept and for general arrangement expressed in the documents.  Review shall not be construed to mean that the reviewer accepts the  detail calculations and dimensions shown in the shop drawings or any deviation from the requirements of the contract documents.  Contractor is responsible for errors or omissions in the shop  drawings; for meeting all requirements of the contract documents; for confirming and correlating job site dimensions; for information that pertains solely to fabrication process or to techniques of  construction, and for the coordination of the work of all trades. It is understood that the notation on the submittal is not to be construed as an authorization for additional work or additional cost.

18-May-19

He Wei

We would like to submit Method Statement of Hardener application at Parking Lot, Drive Way, Passage, Ramp

Dear Sirs,

Method Statement of Hardener application at Parking Lot, Drive Way, Passage, Ramp

18-May-19 Attention

Dang Thanh Sang

Le Dinh Luong, Nguyen Trung Hau Name:

Subject

FEV-CSCEC32-ARCHI-MOS-RFA-037B - Method Statement of Hardener application at Parking Lot, Drive Way, Passage, Ramp

REQUEST FOR APPROVAL (RFA)

To VINAQS CO., LTD ;

RSP ARCHITECTS PLANNERS &

ENGINEERS (Vietnam) LTD THAM & WONG CO.,LTD

Critical (03 days)

 Norm al (07 days)

Tham&Wong reply:

- We have no objection for this MOS.

- In structure point of view, please refer with comment and proceed necessary work.

Minh Khoa 19-Jun-2019

METHOD STATEMENT OF HARDENER APPLICATION AT PARKING LOT,

DRIVE WAY, PASSAGE, RAMP

OWNER

Capitaland- Thien Duc Investment

Co., Ltd

CONSULTANTS

RSP ARCHITETS PLANNERS&ENGINEERS(VIETNAM)CO.,LTD

A.Casting concrete floor(for FFL-SSL=10cm area,to be in conjunction with the shop drawing)

I Concrete requirements

- Concrete Grade 300(B25 same as the slab), washed aggregate ,20mm

- Steel mesh : BRC A6

- The time stamp stated on the slip and the time the concrete is cast should not exceed 120 minutes

II Equipment

III Sequence of Works

350

- We will have surveyer come to take a look at the construction area, to estimate and suggest the solutions to work it out

- Check on the existing height of the current concrete floor comparing to the designed level

- Hack out the motar and soft partical on surface, deep clean with water

- Grind the existing concrete floor to make the rough.(for better bonding)

- Checking steel mesh to be installed correctly

60mm THK) （Mix 1water+ 2latex + 3cement）.Sika latex layer works as a primer

to strengthen bonding between Slab concrete and new concrete.

3 Construction

-Receive quality concrete which meet the concrete requirement

-Checking on the slump areas and going to pump to the construction areas

-Spreading out the concrete and carefully spread the floor to meet the high requirement

by trust screed or laser screed

-Wait for the surface to be dry, check the slump to see if it is not subsidenced over Appros 5mm (It means the surface dries enough to powel trowel)Then we can go ahead to powel trowel the floor with float pan (compact the concrete floor)

-Because of the un-even slump of the concrete during pumping caused by some objective factors, then after compact, we need to use the level tool to make the surface become even by removing the higher area and filling up the lower areas

-After the floor surface is prepared properly, use the trowling machine to go over and over on the floor to make it even flatter and improve the compression

-Using the finishing trowling machine to the concrete floor surface

-Finish

-Using Cement with water rolling at the joint between two concrete casting

on the site of the concrete)

- Curing

After finish the trowling, start to cure the floor with water at least 7 days

-Start to cut the joints ,1-2cm deep, 3-5mm wide (suggest every 3-4m/1 joint)

-Continue curing as the requirements

- To Reduce the cracks near the column, we propose to cut the joints as plan below :

Refer to shop drawings for joint layout

Notice : the joint cutting does not go over 30% of the floor thickness and not go deep over the protected steel frame

- Fill in the joint : Start to fill up the joint with Appollo sealant A600 or equivalent after

finish the polishing steps as following:

+ Deep clean the joint: make sure to clean all the dust inside and use the strip blade beside the joint in order for the Apollo sealant A600 to be applied and sticked well into the joint

+ Tape the two side of the joints before filling up the Apollo sealant A600

+ Fill up Apollo sealant A600: Depend on the depth of the joint to fill up accordingly,

in general the depth is about 1-2cm

+ During the proccess of filling up Apollo sealant A600, have to make sure the Apollo sealant A600 cover well the joint

+ After that, take off the cover applied Apollo sealant A600 and touch up the surface + Can walk over the joint after applied 8 hours

Refer shop drawing to carry out slope and drain system.

B.Hardener application

I.Equipment

1 Máy mài/Polishing machine 2 Máy đánh bóng tốc độ cao /

Burnishing machine

3 Máy chà sàn liên hợp / Auto

scrubber

4 Máy vệ sinh / Cleaning machine

5 Đĩa nhựa 50 / Resin pad 50 6 Đĩa nhựa 100 / Resin pad 100 7 Đĩa nhựa 200 / Resin pad 200 8 Đĩa nhựa 400 / Resin pad 400

II.Sequence of job

1 Remove all contaminations Start grinding the floor with resin pad #50(if the floor not

flat enough)

2 Remove all contaminations by microfiber prior to start polishing the floor Then polish

the floor with Resin pad #100

3.Deep clean with water prior to application of liquid hardener DECOsil

4.Remove all contaminations by microfiber prior to start polishing the floor Then dry polish the floor with Resin pad #200

10 Bình xịt / Sprayer 11 Cây lau và miếng lau mịn /

Microfiber and mop

5.Remove all contaminations by microfiber prior to start polishing the floor Then polish the floor with Resin pad #400

6.Remove all contaminations by microfiber prior to start polishing the floor Then dry polish the floor with Resin pad #800

7 Deep clean the floor Wait until the floor is dry Then apply sealer

III.Cracks repair ( if nessesary)

1.Materials and equipment

2 Sequence of job

- Use DECOgrout for cracks and holes with 1 mm to 5mm :Cut open the cracks for

better bond and take way the soft partical

- Mix DECObond and DECO grout which mixing ratio =1:5 until we have good

mix Mix for approximately 3 mins

- Apply 1 layer of the DECObond for better bonding and fill the repair mix into the

cracks/small holes and the repair mix should be pushed in the cracks/small holes by

a small trowel or alike

1 Dụng cụ thi công DECOgrout /

Items for fixing floor with

DECOgrout

2 Dụng cụ thi công DECOfix / Items for fixing floor with DECOfix

- Curing in 24 hours

- Use DECOfix for big holes bigger 5mm Cut open the big holes and take away the bad concrete and all loose material

- Mix DECObond and DECOfix which mixing ratio =1:5 until we have good mix Mix for approximately 3 mins

- Apply 1 layer of the DECO bond for better bonding and fill the repair mix into the big holes

- Curing in 24 hours

IV.Quality control of the Polishing job

After polising works, the concrete surface shall be evaluated quality based on the

qualification standard as bellow:

- Test the Mohs hardness on the finished concrete floor surface : meet 5 – 6 in the Mohs Standard

- Test the gloss on the finished concrete floor surface: Average 50 (follow ASTM D523 Standard)

- Test the slippery on the surface: Slippery COF within 0.18 – 0.34 (follow ASTM D2047 Standard) similar to R10 (follow DIN130 Standard)

CAUTION

The selection of the pads and subsequent sequence of steps depends very much on the hardness of the concrete

This document is merely a guideline, which should be adapted if necessary

Requirement of the concrete floor related to the finishing

1 Strength: minimum strength class is grade 300 according to TCVN

2 Flatness and Levelness: FM3(±7.5mm/3m)

3 Curing: 7 days of water curing by keeping the floor wet during this period to reduce the hair crack on the surface

NOTICE: Maintain the floor surface after polishing:

1 Don’t clean the surface with water, or cleaning agents within first 48 hours after polishing

2 Protect the surface by coverring with wood panel or plastic sheets in order to avoid travelling cause damage to the surface

3 If oils or chemicals got splilled on the surface, have to clean it right away within 30 minutes to make sure the polishing remain shining

4 Should cover the scaffolder’s feet with the plastic pads to avoide scratching the surface

5 Make sure to cover the surface with plastic sheet in order to avoide water base paits may drop on

6 During cutting and welding construction process, dust can leave holes and stain the surface Those structures that need to deal with welding should be done out of the surface area

7 Avoid to hit the surface with sharp things

B25(M350)