Republic of the Philippines DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS Batangas III District Engineering Office OFFICE OF THE DISTRICT ENGINEER Tanauan City
TERMS OF REFERENCE
CONSULTANCY SERVICES FOR THE CONDUCT OF: PAVEMENT CORE TEST OF THE FOLLOWING ROAD SECTIONS NAMELY: 1. DAANG MAHARLIKA (LZ) – 12.605KM 2. MANILA – BATANGAS ROAD – 11.193 KM 3. BANAY-BANAY – MOJON – CUENCA ROAD – 13.948 KM
I. INTRODUCTION
A. PROJECT SCOPE
The proposed project which is the subject of Pavement Core Test of the following Road Sections namely:
Name of Project Scope of Work No. of holes Daang Maharlika (LZ) Pavement Core Testing 25 (12.605 KM)
22 Manila – Batangas Road Pavement Core Testing (11.193 KM)
Banay-Banay – Mojon – Cuenca Road Pavement Core Testing 27 (13.948 KM)
TOTAL 74
II. SCOPE OF SERVICES
A. GENERAL
1. The Consultant shall be responsible for carrying out the necessary Pavement Core Drilling Works in respect to the project stated.
2. After the receipt of Notice to Proceed (NTP), the Consultant shall coordinate with the Planning and Design Section, Batangas III District Engineering Office, particularly on Pavement Core Drilling requirements to minimize changes/modifications and unnecessary delays in the preparation of final plans and estimate/quantification.
3. In the preparation of reports, the Consultant shall use up to date software for presentation of results. After completion of the Pavement Core Drilling Works, all electronic files of reports and other relevant documents shall be turned-over by the Consultant to DPWH.
4. Upon completion of the Pavement Core Drilling Activities, the Consultant shall submit their final report to Batangas III District Engineering Office for presentation and subsequent approval.
Pavement Core Drilling Works
A. LOCATION
Before the conduct of Pavement Core Drilling Works, The Consultant shall coordinate with the Batangas III District Engineering Office, for proper coordination on the location of the project.
B. SCOPE OF PROJECT
This test method covers obtaining, preparing, and testing cores drilled from concrete for length or compressive strength or splitting tensile strength determinations and beams sawed from concrete for flexural strength determinations.
The Standard Test Procedure is used for collecting samples of concrete / asphalt pavement to a depth of 2m by coring methods
The consultant shall provide all the labor, instrument/equipment materials and supplies, vehicles, bunkhouses, etc., necessary to perform satisfactorily the subsurface exploration herein required, viz:
a. Drilling and sampling b. Laboratory Testing and Analysis c. Preparation and submission of Reports
The Consultant shall be held solely responsible for the result of this boring/drilling exploration. Also, ALL OTHER NECESSARY WORKS TO BE ACCOMPLISHED MUST BE SUBMITTED in order to complete the report.
C. DETAILED EXPLORATION REQUIREMENTS / SPECIFICATIONS
Drilling and Sampling
1. Location and Number Five Hundred (500) meters interval of holes on the proposed project, at the inner lane locations shown on the plan with coordinates.
2. Coring Diameter
The hole diameter to be used is 2 inches / 5 centimeters.
3. Depth of Borings Shall be equal to the 2 meters or extend if necessary depending on the Actual Site Condition
4. Procedure
ASTM C42/C42M is the standard test method for obtaining and testing the strength of drilled cores and sawed beams of concrete. Cores are extracted from hardened in-place concrete primarily to measure in-place concrete strength. Cores can also be extracted from concrete pavements and structures to verify compliance with construction dimensional tolerances, condition evaluation of structures, forensic evaluation using petrography and chemical methods, estimating the composition of concrete, and density and voids analysis. This TIP is limited to compressive strength testing of cores which is the more common reason for taking concrete cores.
Measuring the Length of Drilled Cores
Cores for determining the thickness of pavements, slabs, walls or other structural elements shall have a diameter of at least 2 inches. When the lengths of such cores are stipulated to be measured in accordance with Test Method C 174/C 174 M.
5. Equipment / Apparatus a. Core Drill For obtaining cylindrical core specimens with diamond impregnated bits attached to a core barrel. b. Saw For cutting beam specimens to size for flexural strength tests and to trim ends of cores. The saw shall have a diamond or silicon-carbide cutting edge and shall be capable of cutting specimens that conform to the prescribed dimensions, without excessive heating or shock.
6. Sampling
6.1 Samples of hardened concrete for use in the preparation of strength test specimens shall not be taken until the concrete is strong enough to permit sample removal without disturbing the bond between the mortar and the coarse aggregate. When preparing strength test specimens from samples of hardened concrete, samples that have been damaged during removal shall not be used unless the damaged portions are removed and the resulting test specimen is of suitable length. Samples of defective or damaged concrete that cannot be tested shall be reported along with the reason that prohibits use of the sample for preparing strength test specimens. 6.2 Specimens containing embedded reinforcement shall not be used for determining compressive, splitting tensile, or flexural strength.
Core Drilling A core specimen shall be drilled perpendicular to the surface and not near formed joints or obvious edges of a unit or deposit. Record and report the approximate angle between the longitudinal axis of the drilled core and the horizontal plane of the concrete as placed. A specimen drilled perpendicular to a vertical surface or perpendicular to a surface with a batter shall be taken from near the middle of a unit of deposit when possible.
Water Level Measurement
The water level shall be measured daily (before and after) whenever encountered in a borehole.
Laboratory Testing Analysis
The preparation of samples for testing shall be made in accordance with AASHTO. The following test shall be made on samples obtained from boring, drilling.
1. Split-Spoon Analysis a. Visual Soil Description b. Mechanical Analysis, AASHTO Designation T88 c. Liquid Limit, Plastic Limit and Plasticity Index, AASHTO Designation T89 and T90 d. Group Index and Soil Classification, use Unified Soil Classification
III. IMPLEMENTATION
A. STAFFING
The following experts/professionals and their member shall be required to carry out the Consulting Services for the bridge project and should have appropriate educational degree, relevant training and adequate years of experience in detailed engineering:
KEY STAFF AND PERSONNEL NO. OF MAN- STAFF MONTH
1. Project Manager 1 60,000.00 2. Sr. Geotechnical Engineer 1 50,000.00
TECHNICAL SUPPORT STAFF NO. OF MAN- STAFF MONTH 3. Civil Engineer 1 30,000.00 4. Laboratory Technician 1 18,000.00
ADMINISTRATIVE SUPPORT STAFF NO. OF MAN- STAFF MONTH 5. Administrative Officer 1 20,000.00
SUPPORT STAFF FOR SOIL NO. OF MAN- INVESTIGATION STAFF MONTH 6. Construction Foreman 1 15,000.00 7. Traffic Aide 2 11,000.00 8. Skilled Labor 2 13,000.00 9. Laborer 6 11,000.00
The Consultant shall provide technical and administrative support staff as May have required. The technical support staff shall be composed of junior engineers in the various disciples of bridge, structural, geotechnical, drainage and cost /specification engineering. The development of these personnel shall be necessary in accordance with the project requirements and with the prior approval of the DPWH
C. CONTRACT PERIOD
The Consultant’s contract period for undertaking the detailed engineering design shall be One Hundred Twenty (120) Calendar Days and the Consultant shall commence work after receipt of Notice to Proceed.
Prepared by: Approved:
NIEVES C. LASALA GIL B. AGGARI Chief, Planning and Design Section Assistant District Engineer BAC Chairperson