City of Magnolia, TX: Source quality control.

§ 2.01 Materials and/or equipment.

The materials will consist of crushed or uncrushed coarse aggregate mixed with any approved binding material necessary to meet the specified requirements.

Material Types.

Type A material shall consist of broken or crushed aggregate. Type B material shall consist of gravel aggregate. Type C material shall consist of iron ore topsoil. Type D material shall consist of shell aggregate with sand admixture. Type E material shall consist of shell aggregate with sand and caliche admixture. The Contractor may use any one of these types, unless the plans specify a particular one to be used. All material used must meet the requirements specified in the test limitations tabulation.

Grades.

The base material shall consist of Grades 1 or 2, unless specified otherwise on the plans. All grades shall meet the requirements in the specification test limit tabulation, according to standard Texas Department of Transportation Laboratory test procedures. When pilot grading is designated in the plans, the City of Magnolia, Engineer or the designated representative of the Engineer will specify the grading and allowable tolerances to be achieved during production. When necessary, the Engineer or the designated representative of the Engineer may vary the pilot grading to insure the base material produced shall meet the physical requirements specified.

Physical Requirements For Flexible Base Materials.

The physical properties for flexible base material shall conform to the following:

TYPES	Grade 1:		Grade 2:
(Triaxial Class 1) Min. compressive strength, psi: 45 to 0 psi lateral pressure and 175 at 15 psi lateral pressure			(Triaxial Class 1 to 2.3) Min. compressive strength, psi: 35 to 0 psi lateral pressure and 175 at 15 psi lateral pressure
TYPE A Crushed or Broken Aggregate	Retained on Square Sieve	Percent	Retained on Square Sieve	Percent
1-3/4".....		0	1–3/4".....	0 – 10
7/8".....		10 – 35	No. 4.....	45 – 75
3/8".....		30 – 50	No. 40.....	60 – 85
No. 4.....		45 – 65	Max. LL.....	45
No. 40.....		70 – 85	Max. PI.....	15
Max. LL.....		40	*Max Wet Ball Mill.....	50
Max. PI.....		12
*Max Wet Ball Mill		40
*Unless otherwise shown on plans, the maximum increase in material retained on the number 40 sieve resulting from the Wet Ball Mill Test shall not exceed 20.

TYPE B Gravel Aggregate	Retained on Square Sieve	Percent
1-3/4".....		0 – 10
No. 4.....		30 – 75
No. 40.....		70 – 85
Max. LL.....		45
Max. PI.....		15

TYPE C Iron Ore Topsoil	Retained on Square Sieve	Percent
2-1/2".....		0
No. 40.....		50 – 85
Max. LL.....		45
Max. PI.....		15

TYPE D Sand-Shell	Retained on Square Sieve	Percent
1-3/4".....		0 – 10
No. 4.....		45 – 65
No. 40.....		50 – 70
Max. LL.....		45
Max. PI.....		15

TYPE E Shell with Sand and Caliche Admixture	Retained on Square Sieve	Percent
1-3/4".....		0
No. 40.....		40 – 65
Max. LL.....		45
Max. PI.....		15

Materials with plasticity greater than those specified may be accepted if the PI is lowered by addition of lime. The lime for this purpose shall be furnished at the Contractor’s expense.

The Engineer or the designated representative Engineer may accept the material, provided not more than two (2) out of ten (10) consecutive gradation tests performed are outside of the specified limit on any individual or combination of sieves by no more than five (5) percent and where no two (2) consecutive tests are outside the specified limits.

The Engineer or the designated representative of the Engineer may accept the material provided not more than two (2) out of ten (10) consecutive plasticity index samples tested are outside of the specified limit by no more than two (2) points and where no two consecutive tests are outside the specified limits.

Contractor shall supply pneumatic and/or steel wheel rollers of sufficient weight to apply a minimum compression of 325 pounds per linear inch of wheel width. Rolling shall start longitudinally at the sides and proceed toward the center, overlapping on successive trips to provide a uniform final surface of the base. Operate rollers at a velocity that optimizes compaction.

(Ordinance 2007-106, App. B, adopted 3/20/07)

§ 2.02 Source quality control.

The material shall be secured from the sources approved by the Engineer or the designated representative of the Engineer. The pits which the acceptable material to be used shall be taken from, shall be opened up to immediately expose the vertical faces of all of the strata and the material shall be secured in successive vertical cuts extending through all exposed strata, unless otherwise directed.

Testing.

Testing of the flexible base materials shall be in accordance with the following Texas Department of Transportation standard laboratory test procedures:

Preparation for Soil
Moisture Content	Tex-103-E
Liquid Limit	Tex-104-E
Plastic Limit	Tex-105-E
Plasticity Index	Tex-106-E
Sieve Analysis	Tex-110-E
Moisture Density Determination	Tex-113-E
Wet Ball Mill	Tex-116-E
Triaxial Test	Tex-117-E (part II)

Job control samples for testing Soil Constants, Gradation and Wet Ball Mill shall be completed prior to the compaction operations, unless otherwise specified.

Job control samples for triaxial tests shall be taken from the production stockpile and/or from the temporary stockpile on site, unless directed otherwise by the City of Magnolia, Engineer or the designated representative of the Engineer.

(Ordinance 2007-106, App. B, adopted 3/20/07)