Evaluation of Alkali-Silica reaction potential of aggregate using dilatometer method

Chang Seon Shon, Anal K. Mukhopadhyay, Dan G. Zollinger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Existing test methodology for alkali silica reactivity (ASR) are applicable to only a narrow band of accelerated conditions and doubts remain whether these methods have any relevance to concrete performance under field conditions. Aggregate reactivity is a key factor in predicting the concrete ASR and is a function of alkalinity, temperature, size and crystallinity. Recently developed at the Texas Transportation Institute, Texas A&M University, a testing apparatus called a dilatometer has been used to measure aggregate ASR expansion and introducing activation energy as a single parameter to represent aggregate ASR reactivity. The expansion-time characteristics as a function of temperature can be expressed by the term activation energy (Ea). The rationality of the dilatometer test procedure is explored by conducting comprehensive laboratory experiments related to the effects of test solution (NaOH) alkalinity, temperature and Ca2+ contents on Ea. Dilatometer measures the volumetric expansion due to ASR and accounts the direct measurement of expansion produced by the reaction products. Based on the test results, it is observed that this test method will be useful to evaluate ASR potential of aggregates based on their Ea within a very short period of time (e.g., within 3 days). The dependency of Ea on alkalinity, Ca2+ content and aggregate size provides a means to evaluate ASR potential of concrete relative to levels of alkali and temperature that occur under field conditions.

Original languageEnglish
Title of host publicationAirfield and Highway Pavements
Subtitle of host publicationMeeting Today's Challenges with Emerging Technologies - Proceedings of the 2006 Airfield and Highway Pavement Specialty Conference
PublisherAmerican Society of Civil Engineers (ASCE)
Pages646-658
Number of pages13
ISBN (Print)0784408386, 9780784408384
DOIs
Publication statusPublished - 2006
Event2006 Airfield and Highway Pavement Specialty Conference - Atlanta, GA, United States
Duration: Apr 30 2006May 3 2006

Publication series

NameProceedings of the 2006 Airfield and Highway Pavement Specialty Conference
Volume2006

Other

Other2006 Airfield and Highway Pavement Specialty Conference
CountryUnited States
CityAtlanta, GA
Period4/30/065/3/06

Keywords

  • Activation energy
  • Alkali-silica reaction (ASR)
  • Asr expansion
  • Dilatometer

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Evaluation of Alkali-Silica reaction potential of aggregate using dilatometer method'. Together they form a unique fingerprint.

Cite this