Surface Preparation before laying Hot Mix TACERA 2017

What to look for before laying Hot Mix

Needs

Asphalt - Water Ponding

THREE RULES ABOUT WATER on ASPHALT SHED THE WATER

Remove water Drains

Surface Preparation Profiling for smoothness Improvement in ride

GPR Ground Penetrating Radar (GPR): Determine existing pavement thickness, including HMA and base course thickness

GPR Use of Ground Penetrating Radar (GPR) The development of voids beneath roadways is a serious hazard, making their early detection an important aspect of infrastructure maintenance. Early identification of concealed subsurface voids under a roadway structure is critical to prevent major failures from occurring. One of the most effective tools in use is ground penetrating radar (GPR). GPR has advanced to a level where the subsurface condition of a roadway can be diagnosed with confidence. GPR is a non-destructive geophysical device used for subsurface exploration and operates by transmitting an electromagnetic pulse from an antenna into the ground and then capturing the partial reflections from subsurface layers.

GPR

GPR

Falling Weight Deflectometer A falling weight deflectometer (FWD) is a testing device used by civil engineers to evaluate the physical properties of pavement. 

FWD FWD data is most often used to calculate stiffness-related parameters of a pavement structure. The FWD is designed to impart a load pulse to the pavement surface which simulates the load produced by a rolling vehicle wheel. A load cell mounted on top of the load plate measures the load imparted to the pavement surface.

Falling Weight Deflectometer

SAFE!!!

Signing/Warnings Safety

Surface Preparation: Subgrade

Surface Preparation: Subgrade

Surface Preparation Clean the surface (sweeping) Remove Vegetation from shoulders (blading) Remove raised pavement markers Patch defective areas: Asphalt Concrete Seal the cracks Mill the pavement

Sweeping/Blade Edges

Surface Preparation Sweeping

Remove Pavement markings

Pavement Markings: Remove

Patch Defective areas Asphalt

REPAIRS:

Repairing concrete

Full depth concrete repair

Clean and Seal Cracks

Clean and Seal

SEALING CRACKS

SEALING

Crack Sealing Too Much?

Crack Seal

Crack Seal: Hot Asphalt

Surface Preparation Milling: Removes older pavements Helps to re-establish road profile Provides RAP for recycling operations Allows curb and gutter grade lines to remain Provides a technique to maintain clearances for overhead structures

Nice Milling

Milling the Surface

TACK COAT

Tack Coat Clean the surface before placing the tack coat. Unless otherwise approved, apply tack coat uniformly at the rate. The rate should be between 0.04 and 0.10 gal. of residual asphalt per yard of surface area.

Tack Coat Apply the tack coat in a uniform manner to avoid streaks and other irregular patterns. Apply a thin, uniform tack coat to all contact surfaces of curbs, structures, and all joints. Allow adequate time for emulsion to break completely prior to placing any material.

Tack Coat Prevent splattering of tack coat when placed adjacent to curb, gutter, and structures. Roll the tack coat with a pneumatic-tire roller to remove streaks and other irregular patterns when directed.

Is this a good application?

Is this a good application?

Is this a good application?

Good or Bad ?

Good or Bad ?

Thin overlay/Level ups

THIN OVERLAY: Level Up

THIN OVERLAY: PFC

READY

Surface Preparation before laying Hot Mix THANK YOU