ROADWAY BASE
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| ROADWAY BASE, EARTHWORK, ASPHALT CONCRETE PAVING, DETERMINE THE LOCATION, NECESSARY TESTS, GRANULAR BASE, ASTM DESIGNATION GRADED MATERIAL, AASHTO, SOIL-AGGREGATE, SUBBASE, ROADWAY BASE GRANULAR BASE, COURSE ANGULAR, CRUSHED STONE, DELETERIOUS SUBSTANCES, COMPACTED LIQUID, LIMIT PLASTICITY INDEX, RESISTANCE TO ABRASION, SUBGRADE INSPECTION & APPROVAL |
1.1 DESCRIPTION of labor
A. The extent of the work includes the availability, spreading and compacting of road base in compliance with the specifications and in conformity with grade, lines and thickness shown on the drawings.
B. the planning shall be supported the wants of AASHTO HS20-44 hundreds for the community space and Ministry of Transport (MOT) truck wheel hundreds for the economic areas.
C. connected Work:
1. Section: Earthwork
2. Section: Asphalt Concrete Paving
1.2 QUALITY ASSURANCE
A. verify the situation, suitableness, and amount of materials obtainable for the provision of the granular base.
B. Perform the mandatory tests and submit reports to the Owner for approval before its transportation to the positioning.
C. Mineral material for road Base ought to usually befits the present edition of following commonplace specification:
ASTM Designation:
D 2940 Standard Specification for stratified Material for Bases or Subbases for Highways or Airports
AASHTO Designation:
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| ROADWAY BASE, EARTHWORK, ASPHALT CONCRETE PAVING, DETERMINE THE LOCATION, NECESSARY TESTS, GRANULAR BASE, ASTM DESIGNATION GRADED MATERIAL, AASHTO, SOIL-AGGREGATE, SUBBASE, ROADWAY BASE GRANULAR BASE, COURSE ANGULAR, CRUSHED STONE, DELETERIOUS SUBSTANCES, COMPACTED LIQUID, LIMIT PLASTICITY INDEX, RESISTANCE TO ABRASION, SUBGRADE INSPECTION & APPROVAL |
M 147 Materials for mixture and Soil-Aggregate molding, Base, and Surface Courses
PART two – merchandise
2.1 ROADWAY BASE (GRANULAR BASE COURSE)
A. General: Sound present material, or angular crushed stone, clean and free from organic matter and unsuitable material or different injurious substances and in such condition that it will be without delay compacted beneath watering and rolling to create a firm and stable base.
B. necessities (Perform the subsequent each a thousand conductor m): Gradation necessities of the road base material, once tested in accordance with ASTM C136 shall be as follows:
Sieve Size Base Material Designations and Nominal
Maximum Size of mixture
Metric,
mm SAE,
in 25.0 mm 19.0 mm
37.5 1½ 100 -
25.0 1.0 77-94 100
19.0 ¾ 65-87 85-96
12.5 ½ 50-76 66-86
9.5 3/8 43-70 57-79
4.75 No. 4 29-56 39-63
2.36 No. 8 20-45 27-48
1.18 No. 16 14-35 18-36
0.60 No. 30 10-26 12-27
0.30 No. 50 7-19 8-20
0.15 No. 100 5-14 5-14
0.075 No. 200 3-10 3-10
C. different Requirements:
Liquid Limit ASTM D423 most twenty five
physical property Index ASTM D424 Maximum six
Resistance to Abrasion, % ASTM C131 Maximum fifty
CBR, % ASTM D1883 Minimum fifty
D. Gradation of the road base material shall have Associate in Nursing “S-shaped curve” that plots higher than the utmost density line (MDL) for the and four.75 millimetre fraction and below the MDL for fine fraction. additionally, it's counseled to be outside of the “restricted zone”. Gradation is allowed to undergo the “restricted zone” if there's a history of thriving performance or supporting take a look at results.
PART three – EXECUTION
3.1 SUBGRADE examination & APPROVAL
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| ROADWAY BASE, EARTHWORK, ASPHALT CONCRETE PAVING, DETERMINE THE LOCATION, NECESSARY TESTS, GRANULAR BASE, ASTM DESIGNATION GRADED MATERIAL, AASHTO, SOIL-AGGREGATE, SUBBASE, ROADWAY BASE GRANULAR BASE, COURSE ANGULAR, CRUSHED STONE, DELETERIOUS SUBSTANCES, COMPACTED LIQUID, LIMIT PLASTICITY INDEX, RESISTANCE TO ABRASION, SUBGRADE INSPECTION & APPROVAL |
A. The Contractor shall examine the subgrade elevations, grade, tolerance, dimensions, compaction and also the conditions beneath that the road base work is to be performed and proper any unsatisfying conditions instantly before putting base materials.
B. don't proceed with the work till unsatisfying conditions are corrected in a very manner acceptable to the Owner.
3.2 PLACING OF road BASE AND SHOULDER MATERIAL
A. Deliver road base and shoulder material as the same mixture and place on the road and shoulder bed by suggests that of controlled mechanical spreader, and at the same amount per linear meter and at a rate which is able to give given|the desired} compacted thickness specified. Avoid segregation of fabric and material not uniform in mixture.
B. Place material in compacted layers of roughly equal thickness. Unless otherwise approved, thickness isn't to exceed a hundred and fifty millimetre for anybody layer. once placed in two or a lot of layers, allow initial layer to dry simply sufficiently for stability throughout putting of the next layer. allow the finished base to dry simply sufficient for stability throughout putting of any building material.
3.3 COMPACTING AND GRADE TOLERANCE
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| ROADWAY BASE, EARTHWORK, ASPHALT CONCRETE PAVING, DETERMINE THE LOCATION, NECESSARY TESTS, GRANULAR BASE, ASTM DESIGNATION GRADED MATERIAL, AASHTO, SOIL-AGGREGATE, SUBBASE, ROADWAY BASE GRANULAR BASE, COURSE ANGULAR, CRUSHED STONE, DELETERIOUS SUBSTANCES, COMPACTED LIQUID, LIMIT PLASTICITY INDEX, RESISTANCE TO ABRASION, SUBGRADE INSPECTION & APPROVAL |
A. Compaction: Compact road base and shoulder, and each layer thence to not but 100% of most density in accordance with ASTM D1557, Method D. take a look at density of compacted base in accordance with ASTM D2167 or ASTM D 2922 or ASTM D1556. Conduct one take a look at for every 2000 sq m of in-place material, however in no case but 3 tests daily for every layer. Perform ASTM D1557 once for each ten field density tests of ASTM D1556, ASTM D 2922 or ASTM D2167.
B. Grade Tolerance: The surface of the finished base shall not vary by over + ten millimetre once tested with a 3-meter hand tool and once placed on, and parallel or perpendicular to the middle line of the road and also the compacted base shall not vary by over + ten millimetre from the desired elevation. Correct all depressions and humps surpassing the required tolerances.
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