Abstracts
Evaluation of the Effectiveness of Addressing Alka
By Tennis , Paul D.
Portland Cement Association
5420 Old Orchard Road
Skokie , IL 60077-1083
PH: 847-966-6200
FAX: 847-966-8389
E-Mail: paul_tennis@portcement.org
Problem Statement
In 1994 PCA developed its "Guide Specification for Concrete Subject to Alkali-Silica Reactions" to provide a rational methodology for controlling ASR. Since the Pennsylvania Department of Transportation is conducting a field study (#95-055) on ASR mitigation methods over a period of five years, this PCA work was designed as a supplement to provide additional data to test the "Guide Specification" and revise it if necessary.
Research Objectives
1) Develop data to supplement a field test program being carried out by PennDOT. 2) Examine relationships between field performance and two laboratory test methods, ASTM C 1293 and ASTM C 441, which are currently referenced in PCA's "Guide Specification." 3) Test the two aggregates (coarse and fine) according to ASTM C 227 to provide additional information to be correlated with the results of ASTM C 1260 testing being conducted by PennDOT.
Research Method
The portion of the study funded by PCA consists of obtaining the materials and proportions to be used in the PennDOT work and perform ASTM C 1293 and C 441 tests using the same 13 mix designs. The ASTM C 1293 tests will continue for three years, after which as many as six specimens will be examined petrographically. In addition, ASTM C 227 tests will be performed on each of the two aggregates used in the test program. Specimens will be monitored for two years.
Product
The results will be reported directly to PennDOT with copies to PCA. PennDOT may choose to include the data in their report to FHWA, which is sponsoring the PennDOT program. PCA will use the results to modify the "Guide Specification," if necessary, so that it reflects the performance of concrete under field conditions. With the permission of PennDOT, the results may be reported in PCA publications.
Completion Date: Dec 31, 2000
Category: Materials
Keywords: accelerated tests, alkali-silica reactions, concrete durability, field tests,
Date Posted: May 18, 1998
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