01022962

Component

https://doi.org/10.3141/1979-03

http://scholar.google.com...nger&publication_year=2006

Alkali–silica reaction (ASR) continues to be a detriment to the long-term performance of concrete. Certain initial conditions related to material alkalinity, aggregate reactivity, humidity, and temperature conditions are known to initiate ASR. A key factor in the prediction of ASR in concrete over time is the reactivity of the aggregate, but current test methodology is largely simulative in nature and yields mainly empirical results that apply to only a narrow band of conditions, and leave many questions as to whether these methods have any relevance to concrete performance under field conditions. Improvement can be found by using a performance-based approach that can address the ASR potential of concrete at levels of alkali, temperature, and moisture that are realistic and representative of actual field conditions. In the present study, the concept of ASR-related activation energy is introduced as a representative single parameter of the ASR. An attempt has been made to introduce the dilatometer test method as a part of a performance-based testing protocol for predicting potential ASR aggregate reactivity in terms of activation energy. It is observed that this new test method can categorize minerals and aggregates based on their reactivity within a short period. The use of the activation energy provides a unique parameter for evaluating ASR susceptibility of minerals and aggregates.

01039954

English

pp 1-11

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099897

Print

Figures (11) ; References (19)

Activation (Chemistry); Alkali silica reactions; Chemical reactivity; Concrete aggregates; Dilatometers; Expansion; Temperature; Test procedures; Time

Highways; Materials; I32: Concrete

PRP, TRIS, TRB, ATRI

Mar 3 2006 11:03AM

• Assessment of Flowable Fill Strength in Pavement Construction
• Capping Systems for High-Strength Concrete
• Comparison of Flatbed Scanner and RapidAir 457 System for Determining Air Void System Parameters of Hardened Concrete
• Effects of Base Type on Modeling Long-Term Pavement Performance of Continuously Reinforced Concrete Sections
• Efforts to Improve Durability of Concrete in Virginia
• Evaluation of Mechanical Properties for Self-Consolidating, Normal, and High-Performance Concrete
• Investigation into Potential of Alkali–Acetate–Based Deicers to Cause Alkali–Silica Reaction in Concrete
• Investigation of Portland Cement Concrete Mix Consistency and Concrete Performance Using Two-Stage Mixing Process
• Long-Term Effects of Magnesium Chloride and Other Concentrated Salt Solutions on Pavement and Structural Portland Cement Concrete: Phase I Results
• Measurement of Volume Change in Cementitious Materials at Early Ages: Review of Testing Protocols and Interpretation of Results
• Mitigating Alkali–Silica Reaction in Concrete Containing Recycled Concrete Aggregate