bigcity_header

navbg

navbg

Big City Crushed Concrete Products

 

Main Products

 

TXDot Flex Base

 

1 1/2" - 3/4"

 

3" - 1 1/2"

 

3/8" minus

 

Crushed Asphalt

 

Mobile Crushing

 

Free Concrete Disposal

 

 

ITEM 247
FLEXIBLE BASE

 

247.1. Description. Construct a foundation course composed of flexible base.

 

247.2. Materials. Furnish uncontaminated materials of uniform quality that meet the requirements of the plans and specifications. Notify the Engineer of the proposed material sources and of changes to material sources. The

Engineer may sample and test project materials at any time before compaction throughout the duration of the project to assure specification compliance. Use Tex-100-E material definitions.

A. Aggregate. Furnish aggregate of the type and grade shown on the plans and conforming to the requirements of Table 1. Each source must meet Table 1 requirements for liquid limit, plasticity index, and wet ball mill for the grade specified. Do not use additives such as but not limited to lime, cement, or fly ash to modify aggregates to meet the requirements of Table 1, unless shown on the plans.

Table 1
Material Requirements

Property

Test Method

Grade 1

Grade 2

Grade 3

Grade 4

Master gradation sieve
size (% retained)

Tex-110-E

 

 

 

 

As shown
on the plans

2-1/2 in.

 0

1-3/4 in.

 0

0-10 

 1-10

7/8 in.

 10-35

 -

 3/8 in.

30-50 

 No. 4

45-65 

 45-76

45-75 

 No. 40

70-85 

60-85 

 50-85

Liquid limit, % max.1

Tex-104-E

35

40

40

As shown
on the plans

Plasticity index, max.

1

Tex-106-E

10

12

12

As shown
on the plans

Plasticity index, min.1

As shown on the plans

Wet ball mill, % max.2

Tex-116-E

40

45

-

As shown
on the plans

Wet ball mill, % max. increase
passing the No. 40 sieve

20

20

-

Classification3

Tex-117-E

1.0

1.1-2.3

-

As shown
on the plans

Min. compressive
strength3

, psi
lateral pressure 0 psi
lateral pressure 15 psi

 

45
175

 

35
145

 

-
-

As shown
on the plans

1. Determine plastic index in accordance with Tex-107-E (linear shrinkage) when liquid limit is unattainable as defined in Tex-104-E.
2. When a soundness value is required by the plans, test material in accordance with Tex-411-A.
3. Meet both the classification and the minimum compressive strength, unless otherwise shown on the plans.

 

1. Material Tolerances. The Engineer may accept material if no more than 1 of the 5 most recent gradation tests has an individual sieve outside the specified limits of the gradation.

When target grading is required by the plans, no single failing test may exceed the master grading by more than 5 percentage points on sieves No. 4 and larger or 3 percentage points on sieves smaller than No. 4.

The Engineer may accept material if no more than 1 of the 5 most recent plasticity index tests is outside the specified limit. No single failing test may exceed the allowable limit by more than 2 points.

 

2. Material Types. Do not use fillers or binders unless approved. Furnish the type specified on the plans in accordance with the following.

a. Type A. Crushed stone produced and graded from oversize quarried aggregate that originates from a single, naturally occurring source. Do not use gravel or multiple sources.

b. Type B. Crushed or uncrushed gravel. Blending of 2 or more sources is allowed.

c. Type C. Crushed gravel with a minimum of 60% of the particles retained on a No. 4 sieve with 2 or more crushed faces as determined by Tex-460-A, Part I. Blending of 2 or more sources is allowed.

d. Type D. Type A material or crushed concrete. Crushed concrete containing gravel will be considered Type D material. Crushed concrete must meet the requirements in Section 247.2.A.3.b, “Recycled Material (Including Crushed Concrete) Requirements,” and be managed in a way to provide for uniform quality. The Engineer may require separate dedicated stockpiles in order to verify compliance.

e. Type E. As shown on the plans.

 

HOME   |     ABOUT US    |     PRODUCTS   |    LOCATIONS    |     PROJECTS    |       CONTACT US

Website by Visuplay Creative Group                         ©2011 Big City Crushed Concrete  All Rights Reserved.