Review on Highway Material Mix Design

To

The Concessionaire,

Subject: Review observations on GSB Mix design-reg.

Dear Sir,

With reference to your submission related to the GSB Mix Design for Section 3, we would like to inform you that the following are our observations:.

1. Stone Quarry approval-related documents are not being submitted.

2. The CBR Report is not enclosed.

3. The water absorption report is not enclosed.

These are for your information and necessary compliance.

Thanking you

case-1

To

The Concessionaire,

Subject: Review observations on WMM Mix design-reg.

Dear Sir,

With reference to your submission related to the wet mix macadam mix design for our review, we have reviewed the same and would like to inform you that we have found the following deficiencies:.

1. NOC for stone quarry not yet submitted

2. Test reports are not witnessed by the independent engineer representative.

3. Methodology for earth work (GSB and WMM) is not yet submitted.

Hence, we are not in a position to accept the wet mix macadam designs.

Thanking you

case-2

Dear Sir,

With reference to your submission related to the Wet Mix Macadam Mix Design approval, we have reviewed the same and have got no objection in using the same with materials from XXXX Crusher of Sec-1.

Joint sampling and testing of WMM material are to be done as per MORTH frequencies and specifications.

 This is for your information and necessary compliances.

Thanking you

Case-1: Letter on No objection in accepting Dense Bituminous Macadam Mix Design

To

The Concessionaire,

Subject: No objection in accepting the Mix Design for DBM for Section-4- Reg.

Dear Sir,

With reference to your submission related to the Dense graded Bituminous Macadam Grade-II Mix Design for section 4 of the Project Highway for review, we have finally reviewed the same after getting further updates from your end, and have got no objection in accepting the same but, it is strictly related with following sources of aggregate.

1. Aggregates must be from xxxx stone quarry.

2. VG-30 Bitumen from HPCL (Vizag) is to be used here exclusively.

This is a provisional acceptance before submission of trial patch reports only.

Thanking you,

Case-2: Independent Engineer Comments on Dense Bituminous Macadam Mix Design

Subject: Dense Bituminous Macadam Mix Design (Gr-ii) for Section- 3.

Ref: Your Letter submission

Dear Sir,

With reference to your submission related to the dense graded Bituminous Macadam Gr.2 Mix Design for section-3 of the Project Highway for review. The mix design can be reviewed and noted that you have submitted two different trail mix designs with varied bitumen contents.

Please conduct another trail mix designs as per guidance by our SQME, and submit the final Mix design report for our review.

Thanking you,

To

The Concessionaire,

Case-1: Subject: Review observations on Bituminous Macadam Mix design-reg.

Dear Sir,

With reference to your above submission, related to the Bituminous Macadam Mix Design & Methodology for our review, we have reviewed the same and would like to intimate you that, we have no objection in accepting the same, but it is strictly related with following sources only.

1. Aggregates to be procured only from approved Quarry.

2. Only VG-30 grade bitumen are to be procured form approved refinery. (name of the refinery)

These are for strict compliances only.

Case-2: Subject: Review observations on Bituminous Macadam Mix design-reg.

With reference to your submission related to the Bituminous Concrete Mix Design for section – 4 of the Project Highway for review, we have reviewed the same and have got the following objections.

1. The Mix Design has not been authenticated by representatives of IE as well as PMC.
2. As per the approved methodology of BC in Quality Assurance Plan (QAP), and other codal provisions modified Bitumen should be used in BC Mix Design.
3. As per section 509.2.1 of MoRTH, the Grade of Bitumen shall be selected based on manual for Construction and Supervision Bituminous Works. As per Table 2.5 of Bituminous Manual, 35 Grade of Penetration Bitumen is recommended for Traffic between 10 to 30 MSA in maximum temperature more than 40°C and minimum temperature greater than 20°C. If Traffic is more than 30 MSA, one grade harder Grade of penetration grade Bitumen should be used in BC Mix Design instead of VG-30 grade bitumen. In view of the above, the Concessionaire is advised to revise the Mix Design by using modified bitumen of PMB 40 and submit the same for approval.

Hence we are not in a position to accept the above said Mix Design.

Thanking you,

To

The Concessionaire,

Case 1: Subject: Concrete Mix design, section-ii-reg.

With reference to your above letters and the documents submitted by you, the same have been scrutinized by us and we would like to intimate you, that we have no objection, vide the previsions in clause 1008 of MoRT&H, IVth revision, if you use the following Concrete Mix Design, as of now.

To be used in the cast in situ bored piles in Krishna Bridge

This acceptance is on provisional basis, as you have to offer the same for IE’s checking of regular mixes continuously.

Thanking you,

To

The Concessionaire,

Case-2: Subject: Review observations on Concrete Mix Design for Sec. III-Reg.

Dear Sir,

With reference to your above submission, related to the concrete mix design for our review, we have reviewed the same and would like to inform you that we have found the following deficiencies:

1. NOC for stone quarry (coarse aggregate) not yet submitted.

2. 28-day cube strength results were not submitted.

3. Some mix design was not witnessed by any IE representative.

Hence, we are not in a position to accept it.

Thanking you

The Concessionaire

Subject: Dry Lean Concrete Mix Design for Section-III.

Ref: Your Letter Submission

Dear Sir,

With reference to your above letters and the document submitted by you, the same has been scrutinized by us and we would like to intimate you, that we have no objection if you use the following Dry Lean Concrete Mix Designs, as of now.

This acceptance is on provisional basis, as you have to check the mixes continuously in presence of IE’s representatives only.

Thanking you