Tasa de crecimiento promedio anual de la población 1950-2000

Tests on concrete, aggregates and mixing water shall be as per 70-TMSS-03, Rev.0. All test results shall be submitted to the COMPANY for review and approval as the tests are completed.

The results of these tests shall be systematically filed with descriptions of where the batch was used. Copies of all test results shall be handed over to the COMPANY REPRESENTATIVE for review and comments.

All test reports and records should be systematically organized, clearly marked, boxed, and when the construction WORK is completed, they should be turned over to the COMPANY REPRESENTATIVE for incorporation into the COMPANY'S permanent records.

In the event that concrete fails to meet strength requirements, in-place testing for concrete strength shall be conducted by the CONTRACTOR while under supervision of the COMPANY REPRESENTATIVE at no additional cost to the COMPANY. In-place testing will be conducted by one (1) or a combination of the following methods:

1. ASTM C42, "Method of Obtaining and Testing Drilled Cores and Sawed Means of Concrete"

2. ASTM C803, "Test Penetrating Resistance on Hardened Concrete" 3. ASTM C805, "Rebound Number of Hardened Concrete"

DE S CRIPT ION CHK’ REVISIONS NO. 3 2 1 PREPARED BY KZ DATE: CHK’D BY: THM APPROVED BA CERTIFIED BY: M. SAFAR DATE

adequate provided such results conform to the provisions of ACI 318M-08.

The COMPANY REPRESENTATIVE reserves the right to require additional cylinders be taken whenever there is just cause, such as a change in batching procedures, a change in concrete materials, breaking of batching, delay in transport or placement, code violation and the like at no additional cost to the COMPANY. Concrete subject to severe exposure condition shall be tested for chloride permeability test.

I. Curinq

All concrete shall be cured with concrete mix quality water (potable) in accordance with recommendations of ACI 305 and ACI 308 and as specified below:

1. Pond Curing:

Ponding shall comprise of at least 40mm deep potable water covering the entire surface of the concrete. The water shall be replenished when less than 50mm deep to assure that 40mm minimum depth required is retained. 2. Wet Burlap Curing:

Wet burlap curing shall comprise at least two (2) layers of constantly damped burlap laid tight against the pre-soaked concrete surface. The burlap shall be kept uniformly damp so that lighter patches or drier burlap are not evident by a clock valve controlled soil soaker hose supplied with water at adequate pressure.

3. Membrane Curing:

Membrane curing shall not be applied to concrete mixes containing pozzolan. Whenever used, membrane curing shall be preceded by saturation of concrete with sprayed water. This water shall be sealed against the concrete by application of a white (reflective) curing membrane in strict accordance with manufacturer's recommendations.

4. All concrete shall be cured for at least seven (7) days except as specified below:

Unreinforced Massive Concrete : 14 days Concrete Blended with Pozzolan : 21 days 5. Water for curing shall meet the following requirements:

Total Dissolved Solids : 500 PPM (maximum) CI + SO4 Chlorides and Sulfates : 300 PPM (Maximum)

pH Value : 7.0 (minimum); 8.5 (maximum)

J. Minimum concrete cover over all reinforcements at and below ground level shall be 85 mm. All other concrete cover requirements shall be as per ACI 318M-08, "Building Code Requirements for Reinforced Concrete and Commentary."

K. The CONTRACTOR shall not place any concrete until the excavations and/or forms and embedded items are inspected by the COMPANY REPRESENTATIVE.

DE S CRIPT ION CHK’ REVISIONS NO. 3 2 1 PREPARED BY KZ DATE: CHK’D BY: THM APPROVED BA CERTIFIED BY: M. SAFAR DATE

This inspection will not relieve the CONTRACTOR of the responsibility of keeping the holes in acceptable condition until placement of concrete is completed nor for the accurate placement of embedded items. The placing of concrete shall be accomplished in such a manner as to prevent segregation of the aggregates.

3.03 CONCRETE ENCASED DUCTBANKS AND HANDHOLES

A. CONTRACTOR shall construct concrete encased ductbanks in accordance with COMPANY Standard Drawing TA-800062. Spare circuit conduits shall always be provided as required. All cable duct installations shall follow the requirements of the COMPANY Construction Standard TCS-P-104.03. Construction of concrete encased conduits for communication shall be in accordance with Detail 1 of the COMPANY Standard Drawing TB-800079.

B. The CONTRACTOR shall provide/construct ductbanks system with PVC pipes, flexible sub ducts, and handholes to route the underground optical fiber cable up to the interface points.

C. The CONTRACTOR shall design and install all necessary ductbanks for Non-Metallic Underground Fiber Optic Cables for the entire cable route. The exact routing of the ductbank shall be proposed by the CONTRACTOR and approved by the COMPANY during the base design phase of the project.

D. Communication ductbanks shall consist of a minimum of 2 x 100 mm dia. PVC conduits. All COMPANY Construction Standards with respect to Civil Works shall be followed. One of the communication conduits shall be provided with four (4) 32 mm dia. rigid PVC sub ducts. The other conduit shall remain vacant. All unused conduits and sub ducts shall be provided with different colored pull ropes and end plugs. E. All structural design calculations shall be submitted together with all drawings to the

COMPANY for review and comments.

F. Excavation and Backfilling shall conform to the COMPANY Construction Specification for Eearthworks, TCS-Q-113.02. No backfilling shall be performed before the structure has been inspected and approved by the COMPANY representative.

G. All forms shall be unyielding and tight jointed to produce hardened concrete of high quality. Formwork shall conform to ACI-374.

H. All conduits installed shall be tested by mandrel of appropriate size, in the presence of COMPANY REPRESENTATIVE and the ends sealed.

I. For Communication ductbank configuration, requirements and details refer to COMPANY Drawing Nos. TB-800079, SB-036367 and TB-800090.

J. The CONTRACTOR shall design the manhole/handhole of sufficient strength for the duty they will be subjected to (i.e. equipment, vehicle, and water and earth pressure). Manholes/handholes shall continuously be free of water and provided with pulling eyes, sump, ladder rungs and all other necessary items. Other Waterproofing requirements of the handholes shall be in accordance with Company Standard Drawing No. TA-800098.

DE S CRIPT ION CHK’ REVISIONS NO. 3 2 1 PREPARED BY KZ DATE: CHK’D BY: THM APPROVED BA CERTIFIED BY: M. SAFAR DATE

K. Communication handholes shall be provided at every change of direction along the proposed route, crossing, start and end of ductbanks and at every 300 meters of continuous run.

L. For the design of the Fiber Optic Communication cable handhole details, refer to COMPANY Drawing TB-800076, for non-traffic areas and Drawing No. TB-800077, for traffic areas.

M. Each fiber optic cable handhole shall be marked with a stainless steel marker plate, with the following information: