The FHWA has recently introduced a new reactivity index (RI) to predict ASR. This novel chemical index can be used to develop two different types of screening tests to evaluate aggregates alone or job mix designs. Both these protocols are free from several of the limitations affecting traditional accelerated ASR testing. The objective of the study presented in this paper was to explore the applicability of the new RI for ASR screening in aggregates used in the construction of airport facilities. The alkali–silica reactivity of the aggregates selected in this study varied from nonreactive to slow reactive based on their historic field records. The ASR susceptibility of these aggregates was determined using two alternative testing protocols based on the RI. The first protocol, known as the Turner-Fairbank ASR susceptibility test (T-FAST), was used to determine the alkali–silica reactivity and the alkali threshold of the aggregates alone. The second protocol, also based on the RI, was applied to determine the ASR susceptibility of the combination of both, fine and coarse aggregates. The results of these two new ASR screening protocols were compared against those obtained using the Advisory Circular 150/5370-10H standard, and ultimately with the historical field performance of the aggregates. The new RI was capable of accurately identifying a slow reactive aggregate that triggered ASR deterioration in the concrete pavement and other structures in Denver International Airport after 20 years of service life.

Access the Conference Proceedings Paper on ASCE Library 

The FHWA has recently introduced a new reactivity index (RI) to predict ASR. This novel chemical index can be used to develop two different types of screening tests to evaluate aggregates alone or job mix designs. Both these protocols are free from several of the limitations affecting traditional accelerated ASR testing. The objective of the study presented in this paper was to explore the applicability of the new RI for ASR screening in aggregates used in the construction of airport facilities. The alkali–silica reactivity of the aggregates selected in this study varied from nonreactive to slow reactive based on their historic field records. The ASR susceptibility of these aggregates was determined using two alternative testing protocols based on the RI. The first protocol, known as the Turner-Fairbank ASR susceptibility test (T-FAST), was used to determine the alkali–silica reactivity and the alkali threshold of the aggregates alone. The second protocol, also based on the RI, was applied to determine the ASR susceptibility of the combination of both, fine and coarse aggregates. The results of these two new ASR screening protocols were compared against those obtained using the Advisory Circular 150/5370-10H standard, and ultimately with the historical field performance of the aggregates. The new RI was capable of accurately identifying a slow reactive aggregate that triggered ASR deterioration in the concrete pavement and other structures in Denver International Airport after 20 years of service life.

**[Access the Conference Proceedings Paper on ASCE Library](https://ascelibrary.org/doi/10.1061/9780784483527.012)** 

Alkali–Silica Reactivity of Aggregates from Airfield Pavements and Its Correlation with Historic Field Performance

Welcome to the International Airfield and Highway Pavements Conference of the Transportation & Development Institute (T&DI) of ASCE. This international conference will provide an unrivaled chance to interact and exchange information with worldwide leaders in the fields of highway and airport pavements, as well as airport safety technologies.

This conference will bring together designers, project/construction managers, academics, and contractors from around the world to discuss the state-of-the-art implementation, construction, design, in airfield and highway pavements.

Paper Proceedings: https://doi.org/10.1061/9780784483527 | https://doi.org/10.1061/9780784483503 | https://doi.org/10.1061/9780784483510

Conference DOI: https://doi.org/10.26226/m.63284d15cb3e8e0012755dd4