Attachment 7 1005 2012 Standard Specifications.pdf

Section 1005

10-21

(B) Chemical Admixtures 1

Use a quantity of chemical admixture within the range shown on the current list of 2 approved admixtures issued by the Materials and Tests Unit. 3

(C) Strength of Grout 4

Provide grout with a compressive strength at 3 and 28 days of at least 2,500 psi and 5 4,500 psi, respectively, unless required otherwise in the Standard Specifications. The 6 compressive strength of the grout will be considered the average compressive strength 7 test results of three 2" cubes at each age. Make cubes that meet AASHTO T 106 from the 8 grout delivered for the work or mixed on-site. Make cubes at such frequencies as the 9 Engineer may determine and cure them in accordance with AASHTO T 106. 10

(D) Height Change 11

Provide nonshrink grout with a height change at 28 days between 0% and 0.3%. 12

(E) Durability 13

Provide freeze-thaw durable grout with a durability factor of at least 80. 14

(F) Temperature Requirements 15

The grout temperature at the time of placement shall be not less than 50F nor more 16 than 90F. Do not place grout when the air temperature measured at the location of the 17 grouting operation in the shade away from artificial heat is below 40°F. 18

(G) Elapsed Time for Placing Grout 19

Agitate grout continuously before placement. Regulate the delivery so the maximum 20 interval between the placing of batches at the work site does not exceed 20 minutes. 21 Place grout before exceeding the times in Table 1003-1. Measure the elapsed time as the 22 time between adding the mixing water to the grout mix and placing the grout. 23

TABLE 1003-1

ELAPSED TIME FOR PLACING GROUT

(with continuous agitation) Maximum Elapsed Time

Air or Grout Temperature, Whichever is Higher

No Retarding Admixture

Used

Retarding Admixture

Used 90F or above 30 minutes 1 hr. 15 minutes

80F through 89F 45 minutes 1 hr. 30 minutes 79F or below 60 minutes 1 hr. 45 minutes

(H) Mixing and Delivery 24

Use grout free of any lumps and undispersed cement. Comply with Articles 1000-9 25 through 1000-12 to the extent applicable for grout instead of concrete. 26

SECTION 1005 27

GENERAL REQUIREMENTS FOR AGGREGATE 28

1005-1 GENERAL 29

Obtain aggregates from sources participating in the Department’s Aggregate QC/QA Program 30 as described in Section 1006. Obtain aggregates from pre-approved sources, or have the 31 source approved before use. Approval of such sources is based not only on the quality of the 32 aggregate, but also on satisfactory production facilities and procedures. A list of approved 33 aggregate sources participating in the Department’s Aggregate QC/QA Program in 34

NCDOT 2012 Standard Specifications

10-22

North Carolina and adjoining states is available from the Materials and Tests Unit. This list 1 includes aggregates meeting Specification requirements but whose use is restricted due to 2 history of unsatisfactory service performance. Use of aggregates is allowed in the work 3 provided they have been properly stockpiled in units of not less than 300 tons, tests of 4 representative samples of these aggregates indicate satisfactory compliance with the 5 Specifications and the source meets all the requirements of the Aggregate QC/QA Program. 6

Separate aggregate containing rock of more than one identifiable rock type or particles of 7 visibly different degrees of weathering in amounts of 10% or more into each individual type. 8 Aggregate is acceptable only if each type does not exceed the percentage of wear specified for 9 a particular use. 10

Blended aggregates from different sources are allowed if all aggregates meet the 11 Specifications for soundness or resistance to abrasion. 12

1005-2 HANDLING AND STORING AGGREGATES 13

Handle and stockpile aggregates in such a manner to minimize segregation. 14

Provide sites for aggregate stockpiles that are cleared, grubbed and cleaned with a firm, 15 smooth and well drained ground surface. Maintain a cover of at least 3" of aggregate over the 16 ground surface to avoid the inclusion of soil or foreign material. Operate trucks or other 17 equipment on a stockpile in an acceptable manner. 18

Space or separate with suitable walls or partitions stockpiles of different types or sizes of 19 aggregates to prevent the mixing of the aggregates. Identify stockpiles with signs that can be 20 read from a distance of at least 50 ft from the pile. 21

Do not allow the stockpile to become contaminated with foreign matter or degrade 22 excessively. Failure of aggregate samples to meet all gradation requirements due to excessive 23 degradation will be determined by sieve tests of samples taken from any portion of the 24 stockpile and is cause for discontinuance of such stockpiling procedure. 25

Use material that consists mainly of rock dust produced through normal handling of the 26 aggregate and that is essentially free from clay or shale. 27

1005-3 GRADATION 28

Grade all standard sizes of aggregate to meet Tables 1005-1 or 1005-2. 29

1005-4 TESTING 30

Aggregates will be tested in accordance with the test methods below except where other test 31 procedures are required by other articles covering a particular application. 32

Property Test Method

Gradation AASHTO T 27 and T11, AASHTO T 88 as Modified for Base Course and Stabilizer

Liquid Limit AASHTO T 89 as Modified Plasticity Index AASHTO T 90 Resistance to Abrasion (Percentage of Wear) AASHTO T 96

Soundness

AASHTO T 104

Using Sodium Sulfate

Copies of modified test procedures are available from the Materials and Tests Unit. 33

10-23

L ight-w ei ght

A B

C

(M

A

C

14M

78M

6M

57M

467M

S td

S ize #

2"

95-100

90-100

1 1/2"

75- 100

75-97

95-100

95-100

90-100

20-55

1"

90-100

90-100

20-55

35-70

0-15

3/4"

45-79

55-80

98-100

20-55

25-45

25-60

0-10

1/2"

20- 40

5-40

35-55

85-100

35-70

20-45

0-10

0-8

0-10

0-10

0-5

#4

0-20

10-40

5-20

0-15

0-5

0-5

0-5

#8

45-79

55-80

98-100

20-55

25-45

25-60

0-10

1/2"

0- 25

25-45

#10

0-10

0-10

0-8

#16

14-30

#40

0-12

0-2.5

4-12 B

0-0.6 A

0-0.6 A

0-0.6 A

0-0.6 A

0-0.6 A

0-0.6 A

0-0.6 A

0-0.6 A

0-0.6 A

#200

A . S ee S ubarticle 1005-4(A

B

. S ee S ubarticle 1005-4 (B

A

T

A ggregate S tabilization, A ggregate/B ase C ourse, A sphalt P lant M ix

A sphalt P lant M ix, A S

T , W eep H ole D rains, S tr.C oncrete

A S

T , S

tr. C onc., D rilled P iers, A sphalt P lant M ix

A

T , C oncrete P avem ent

A S

T , P ortland C em ent

A S

T , S

tr. C onc., S houlder D rain, S edim ent C ontrol S tone

A S

T M at C oat, S edim ent

C ontrol S tone

A sphalt P lant M ix

A sphalt P lant M ix

R em ark s

P ercen tage of T otal by W eigh t P assing

T A

B L

E 1005-1

A G

G R

E G

A T

E G

R A

D A

T

IO

N

- C

O A

R S

E A

G G

R E

G A

E

10-24

(A) When aggregates are used for Portland cement concrete, asphalt treatment and asphalt 1 plant mix, the requirements pertaining to material passing the No. 200 sieve are as 2 follows: 3

(1) When tested during production, the amount of material passing the No. 200 sieve 4 shall be no greater than 0.6%. When tested in a stockpile at the quarry site, the 5 amount of material passing the No. 200 sieve shall be no greater than 1.0%. 6

(2) When tested at the job site before use, the amount of material passing the 7 No. 200 sieve shall: 8

(a) Be no greater than 1.5% for aggregate used in Portland cement concrete or 9 asphalt surface treatment. 10

(b) Be no greater than 2.0% for aggregate used in asphalt plant mix. 11

(3) If a stockpile at the job site is found to contain in excess of the specified amount of 12 material passing the No. 200 sieve before use, the Engineer may approve its use 13 provided: 14

(a) For aggregate used in Portland cement concrete, the total percentage by weight 15 passing the No. 200 sieve in the combined coarse and fine aggregate in the mix 16 does not exceed 2.0%, and provided no increase in water-cement ratio is 17 required by the use of this aggregate. 18

(b) For aggregate used in asphalt plant mix, the total percentage by weight of minus 19 No. 200 material in the plant mix being produced, as determined by the 20 extraction test, can be maintained within the limits allowed by the job mix 21 formula. 22

(B) For ABC and ABC(M), in addition to the gradation requirements, the material passing 23 the No. 40 sieve shall not have a LL in excess of 30 nor a PI in excess of 6. For ABC 24 used in asphalt plant mix, when tested during production, in a stockpile at the quarry site 25 or at the job site before use, the amount of material passing the No. 200 sieve shall be 26 from 0.0% to 12.0% by weight and the gradation requirements for material passing the 27 No. 10 sieve (soil mortar) required in Section 1010 for ABC will not apply. For ABC not 28 used in asphalt plant mix, the gradation requirements for material passing the 29 No. 10 sieve (soil mortar) will be as required in Section 1010. 30

TABLE 1005-2

AGGREGATE GRADATION FINE AGGREGATE

Percentage of Total by Weight Passing Std.

Size # 3/8" #4 #8 #16 #30 #50 #100 #200 Remarks

1S 100 90-

40-

0-20 0-3 Blotting Sand, Asphalt Retreatment

2S 100 95-

80-

45-

25-

5-30 0-10 0-3

Concrete, Shotcrete, Grout, Subsurface Drainage, Blotting Sand

2MS

95-

80-

45-

25-

5-35 0-20 0-8A

Concrete, Shotcrete, Grout, Subsurface Drainage

4S 100 95-

15-

0-10 0-5 Mortar

A. When tested at the job site before use, the amount of material passing the 31 No. 200 sieve shall not be greater than 10%. 32