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P a g e o f

Concrete Composite Joint and Crack Sealant

Rheology Based Concrete Composite Crack Sealant Specifications

Table 1: Rheological Performance Tests

Material

Grade

High

Temperature Intermediate Temperature Low Temperature Aging

Jnr, 80°C, 1/KPa (maximum)

G*, MPa (minimum)v cbcbbdd 𝛅, degrees (minimum)

G*, MPa (maximum) 𝛅, degrees (minimum)

G-R ratio (maximum)

Performance 1.0, THT≥64 0.10 75.0 75.0 35.0 2.5

Testing for G* and 𝛅 shall be conducted using ASTM D7175 at the appropriate temperatures.

Table 2: Rheological Performance Tests - Ductility

Material Grade Original 4°C Ductility PAV Aged 4°C Ductility cm (minimum) cm (minimum)

Performance 35 25

Table 3: Adhesion Performance Requirements

Adhesion in Peel to Mortar (ASTM C794) Max Adhesion Force lbs-force), minimum

Performance 40

Table 4: Rotational Viscosity Requirements

Brookfield Viscosity (ASTM

D4402/AASHTO T316)

350°F Viscosity (cP), maximum

Recommended Application

Temperature

Performance 6000 365-385°F

Notes for Guidance: Concrete Composite Crack Sealant Selection

Table 7: Location Based Performance Specification

Location Low Low + 30 rounded Int. + 4

Int.

(Rounded) High Sealant Grade1

Waco -8 20 29-33 30 73 76(30)-10

Kansas City -21 8 22 22 61 64(22)-22

1. Sealant grade is using the basis as the PG grade system for binders. Use SG to reflect standard grade and PG to reflect

Performance grade.

Section 3: Concrete Composite Crack Sealant Placement

I. Equipment Requirements:

A. Air Compressor

i. Minimum of 100 CFM (cubic Feet per Minute) flow

ii. Minimum of 100 PSI (Pound per Square Inch) pressure

iii. Air lance attachment with diameter no larger than 1 inch to allow for precision blow-out

iv. Heat lance attachment that can be used to dry and heat areas of dsssssssssssdmoisture while blowing out cracks simultaneously

B. Kettle

v. Application and storage tank capacities of 180 gallons or more to ensure uniform heating and appropriate viscosity profile

vi. Ability to agitate application tank to minimize colds pockets and coking inside the kettle

vii. Temperature control equipment and application wand that ensures placement temperatures (at the point of crack and joint sealing) over 300 degrees F with appropriate material viscosity to ensure strong sidewall adhesion

C. Support Equipment

i. Power Rotary Wire Wheels for proper clean out of dirt and vegetation

ii. Dust Suppression Sprayers for Lasso use ahead of application trucks in areas with a high concentration of dirt or gravel

iii. Kinder Torches that can be used to dry and heat areas of moisture while blowing out cracks and joints simultaneously

Never allow sealant temperature to exceed 400°F, even momentarily

iv. Grass/Vegetation picks for areas of vegetation that must be manually removed

III. Crack Preparation Steps

A. Cracks will be thoroughly blown out using air compressor and air lance with minimum of 100 PSI

B. If necessary, Kinder Torches will be used to remove moisture from cracks and joints

C. Cracks and joints to be clean and free of debris to a minimum of 0.5 inches and no deeper than 1.5 inches

D. Cracks and joints will have no free or standing water after preparation steps are completed

E. Sealant will be brought up to specified temperature to ensure effective viscosity for placement

V. Sealant Application

A. Check to ensure all safety requirements are being met including:

ii. Final check that areas are blocked off to protect the general public

iii. Final safety check of equipment operability

iv. Final temperature check to ensure appropriate viscosity

v. Engage application wand and begin work

B. Oversized Crack Segment Cracks and Joints larger than 1.5 inches and less than 3 inches - Where pavement distress extends into the pavement base:

iii. Determine best remediation

iv. If backer rod method is being used, select a melt resistant material

v. If choosing to build an in-situ macadam, complete the following steps:

1. Apply crack sealant into the distress to serve as an aggregate lock

2. Place a compressible aggregate (GTR size 18-32 mesh) into the pavement with a 1 inch reservoir at the surface

3. Apply crack sealant

iv. Crack sealant should be filled in a uniform manner that is visually appealing with a consistent over banding, ideally no greater than 0.5 inches

v. Highly fatigued cracking areas on asphalt pavements should not be crack sealed. Alternative strategies such as surface patches should be considered for these areas

C. Typical Crack Segment (less than 1.5 inches):

i. Determine best remediation

ii. If backer rod method is being used, select a melt resistant material

iii. Highly fatigued cracking areas on asphalt pavements should not be crack sealed. Alternative strategies such as surface patches should be considered for these areas.

iv. All construction joints and cracks greater than 1/4“will be sealed on concrete pavement.The sealant shall be applied in the crack or joint reservoir uniformly from the bottom to the top and shall be filled without formation of entrapped air or voids.Pouring pots or gravity-fed sealant applicators shall not be used for sealing cracks and joints. Joints and cracks shall be precision filled to just below the surface of the pavement. Overbanding may not be used unless it is approved by the Engineer or Inspector. After the has cooled, settling shall not exceed 3/8” below the surface. All sealant placed will be paid for by the contract unit price bid per square yard with the bid item “Route Joint and Crack Sealing (Precison Filled)”.

D. Kettle Temperatures:

i. Overheating Parameters

1. Max Material Temperature Set Limit of 380 degrees F

2. Alerts when material temperatures exceed 400 degrees F inside kettle

3. If material exceeds 420 degrees F inside kettle operations will be halted to allow kettle to return to specified temperature range

ii. Under-Heating Parameters

1. Minimum Material Temperature Set Limit of 340 degrees F

2. Alerts when material temperature drops below 340 degrees F inside kettle

3. If material drops below 340 degrees F inside the kettle operations will be halted to allow kettle to return to specified temperature ranges

E. Environmental Conditions

i. Air temperatures not to be below 34℉ (1℃) + rising to ensure proper sidewall adhesion.

Goal is to have pavement temperatures no lower than 34℉ (1℃), or rising.

ii. Pavement Temperatures not to exceed 104℉(40℃) to ensure acceptable set time and non-tracking of material. Goal is to have pavement temperatures no higher than 140℉ (60℃), or lower - alternatively anti-tracking strategies as cooling water misting can be applied.

iii. In the event of rain or wet weather, operations will be stopped until weather has stopped and streets have had sufficient time to dry

Section 4: Quality

A. Inspection

i. Crack Preparation - If the inspector observe poor quality on any of these stretches the contractor will return to that particular street to re prep the road.

1. Reservoir depth will be measured with appropriate tool

2. Moisture in the cracks will be measured using blotting paper or moisture test strips

3. Cleanliness of cracks will be checked visually and clean rags may be used to check that cracks are free of debris

ii. Application – If the inspector observe poor quality on any of these stretches the contractor will return to that particular street to re prep the road

1. Aesthetically pleasing placement will be undertaken

2. Crack reservoir will be filled and the sealant will have a uniform strike off

3. Active cracks will be sealed

4. Attention to transverse and longitudinal cracks to ensure waterproofing of the pavement

5. Failed pavements that are defined as a series of fatigue cracks will not be sealed. This will include “bird bath areas.” A simple field evaluation criteria is the ability to touch three or more cracks when placing the inspectors hand on the pavement.