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Rubberized Asphalt Odessa Texas Case Study

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Dry Prcoess Rubber Asphal Texas Case Study

Dry Process Rubberized Asphalt Odessa Texas Case Study

Rubberized Asphalt Odessa Texas Case Study: In late 2021, a local contractor in West Texas and TX DOT laid a SMAR-F asphalt mix modified with ECR on Texas Route 385-Odessa District in McCamey, TX to compare Dry Process rubber addition to existing Wet Process technologies.

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Project Overview

A local contractor in West Texas and TX DOT laid a SMAR-F asphalt mix that was modified with ECR in late 2021.

Project Location

Texas Route 385-Odessa District, McCamey, TX.

Summary of Dry Process Engineered Crumb Rubber (ECR)

Texas Route 385-Odessa District
McCamey, TX
TX DOT Project (2021) Produced Samples

  • A local contractor in West Texas and TX DOT laid a SMAR-F asphalt mix that was modified with ECR in late 2021.

  • This was to compare the Dry Process addition of rubber to existing Wet Process technologies.

  • The following results illustrate that the SMARF mix modified with Dry Process ECR easily meet the SMARF project specifications.

  • Atlas Labs performed various testing and determined that 16% ECR was the optimal dose rate.

  • Based on that, 16% ECR was mixed with a Texas based PG 64-22 binder to verify performance.

  • Results were excellent and summarized below.

Pre-Production Testing

Atlas Labs performed various testing and determined that 16% ECR was the optimal dose rate. Based on that, 16% ECR was mixed with a Texas based PG 64-22 binder to verify performance.

TxDOT Item 300, Table 16, A-R Binder - Atlas

Pass all tests

Ideal Crack Test – by MAPIL

494 with a 14.5% COV over 4 replicates

Hamburg WTT @ 20,000 passes - Atlas

4.2 mm with a

After passing the initial laboratory tests for the Rubberized Asphalt Odessa Texas Case Study, we were able to move forward with production.

Production Testing

During production, samples were randomly pulled from the trucks and tested following TX DOT guidelines.

Performance testing on the ECR production samples showed excellent cracking and rutting resistance as illustrated below.

Texas Overly – by TxDOT

1000 Cycles; Input CFE 412; Output CFE 2.3; Crack Progression Rate -0.24

Hamburg Wheel Track Test @ 20,000 passes

9.2 mm with a

Testing Results Summary

TxDOT Item 300, Table 16, A-R Binder - Atlas: Pass all tests

Ideal Crack Test – by MAPIL: 494 with a 14.5% COV over 4 replicates

Hamburg WTT @ 20,000 passes - Atlas: 4.2 mm with a

Hamburg Wheel Track Test @ 20,000 passes: 9.2 mm with a

Post-Production Testing: Evaluation of Cores

During the summer of 2023, TxDOT collected cores on this project from both the Wet Process Rubber and the Dry Process Rubber to evaluate cracking resistance. The following report contains Ideal CT data for the Dry Process Rubber (Specimens 1-6) and Wet Process Rubber (Specimens 7-9). This field performance data illustrates that the Dry Process Rubber is outperforming Wet Process Rubber from a cracking resistance standpoint after 2 years of service.

rubberized asphalt odessa texas case study

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