The following minimum standards apply to subdivision street paving:
(1) 
Type.
Asphaltic or reinforced concrete surface with concrete curb and gutter.
(2) 
Pavement width.
a. 
Major streets: 44 feet to 64 feet between back of curbs.
b. 
Secondary streets: 38 feet to 44 feet between back of curbs.
c. 
Residential streets: 30 feet between back of curbs.
(3) 
Cross section.
A standard cross section for a residential street is shown in Figure I.[1] Cross sections for secondary and major streets shall be proportioned similarly. At intersections, curb return radius shall be 20 feet; at cul-de-sacs, 35 feet.
[1]
Editor’s note – Figure I is on file in the city offices.
(4) 
Concrete.
a. 
Reinforcing steel.
1. 
Material: Open hearth new billet steel.
2. 
Yield strength: 60,000 pounds per square inch, minimum.
3. 
Splices: 24 bar diameters.
4. 
Bar size and spacing: No. three bars at 18 inch centers, each way.
5. 
Bar support: Metal or plastic "chairs" shall be used to hold bars in position during placement of concrete.
b. 
Concrete mixture.
1. 
Flexural strength: 650 pounds per square inch minimum modulus of rupture at twenty-eight (28) days (American Society of Testing and Materials, C-78, 3rd point loading).
2. 
Slump: Three inches, maximum.
3. 
Cement factor: Five bags per cubic yard, minimum.
c. 
Cement.
Type I (Normal) Portland cement, or with city engineer's approval, Type III (High Early Strength).
d. 
Aggregate.
Coarse and fine aggregate shall meet the requirements of Texas Highway Department Standard Specification "Item 360" for concrete pavement.
e. 
Jointing.
1. 
Depth of contraction joints: One-fourth of slab thickness.
2. 
Transverse spacing: 20 feet.
3. 
Expansion joints: At intersections.
4. 
Wood joints: Sound heart redwood.
5. 
Joint seal: O.A. 90 asphalt.
f. 
Curing.
Curing method shall retain at least 97 percent of moisture at 24 hours, at least 95 percent at three days, and at least 91 percent at seven days. (American Society of Testing and Materials procedure C-5.)
g. 
Tests.
Flexural strength: Three molds per 200 linear feet.
h. 
Placement.
Concrete shall not be placed on frozen subgrade; when air temperature is 38 degrees Fahrenheit or below; when air temperature is below 42 degrees Fahrenheit and declining; when finishing cannot be completed during natural daylight.
(5) 
Asphaltic pavement.
a. 
Curb and gutter.
1. 
Material: Reinforced concrete as specified in this section and Figure I.[2]
[2]
Editor’s note – Figure I is on file in the city offices.
2. 
Width: 18 inches overall.
3. 
Tests: Same as subsection (4)g of this section, except interval shall be three molds per truckload of concrete.
b. 
Base.
1. 
Thickness: Eight inches after final compaction.
2. 
Material and construction.
i. 
Iron Ore: Texas Highway Department Standard Specification "Item 240" for Grade 1 with density control at 95 percent density.
ii. 
Crushed stone: Texas Highway Department Standard Specification "Item 242" for Type B, Grade 1 with density control at 95 percent density.
3. 
Tests.
i. 
Material: The city engineer may require laboratory testing of the proposed material before and/or during construction to determine that it meets the applicable specifications.
ii. 
Compaction: Tests at 200 linear foot intervals, or closer where requested by city engineer.
c. 
Surface course.
1. 
Material: Texas Highway Department Standard Specifications "Item 340" for Hot Mix Asphaltic Concrete Pavement, Type D, including a tack coat.
2. 
Thickness: Two inches after final compaction.
3. 
Density: 95 percent of the laboratory density obtained with the California Kneading Compactor per Test Method No. California 304 or equal test method approved by the city engineer.
4. 
Tests. The city engineer may require the following tests:
i. 
Material: Laboratory tests before and/or during construction.
ii. 
In-place density.
(6) 
Subgrade.
a. 
Rolling machinery: All subgrade shall be rolled.
b. 
Density required: At least 90 percent of maximum density (Modified Proctor Density Test: American Association State Highway Officials T99-49).
c. 
Lime stabilization: Required when plasticity index (P.I.) of subgrade soil exceeds 18.0.
d. 
Cement stabilization: Required when low plasticity index (P.I.) "spongy" or wet soils.
e. 
Subgrade shall not be allowed to dry before concrete or base is placed, nor shall concrete or base be placed on frozen subgrade.
f. 
Density tests: At 200 linear feet intervals, or closer when requested by city engineer.
(Ordinance 83-150-3, § 6(B), adopted 7/26/1983)