00676701

Component

http://onlinepubs.trb.org...trr/1994/1458/1458-018.pdf

https://scholar.google.co...ston&publication_year=1994

In South Dakota during the last decade, alkali-silica reactivity (ASR) has changed from a localized occurrence to a statewide problem. ASTM P214 was chosen as the preferred test for determining potential reactivity of sands used for concrete in the state. The test was modified to use different NaOH concentrations to explore the feasibility of using two different base strengths to better predict reactivity. Of 30 sands tested, over 40% gave results that were inconclusive (expansion values in the 0.1 to 0.2% range), and only 10% of the sands were nonreactive. A modified interpretation of the test results to include a best fit for expansion at 3, 7, 11, and 14 days, using the general equation Y = A sub 2 X-squared + A sub 1 X + A sub 0 (where X = Time to the 1/2 power) gave a much clearer pattern of projected reactivity when the A sub 1 coefficients were plotted against the A sub 2 coefficients for all 30 sands. The sands break out into two linear "families" of coefficients: one reactive and one nonreactive. It appears the method also can be used to determine the effectiveness of pozzolans at reducing ASR.

This paper appears in Transportation Research Record No. 1458, Concrete Research. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01401262

English

p. 129-134

1994

Transportation Research Record

0309060656

Figures (13) ; References (7) ; Tables (3)

Accelerated tests; Alkali silica reactions; Coefficients; Concrete; Durability; Equations; Sand

Highways; Materials; I32: Concrete

TRIS, TRB

Apr 28 1995 12:00AM

• ADDITION OF CLASS C FLY ASH TO CONTROL EXPANSIONS DUE TO ALKALI-SILICA REACTION
• DEVELOPMENT OF CONCRETE DURABILITY SPECIFICATION AND RATINGS IN FLORIDA
• EFFECT OF CURING ON DURABILITY OF FLY ASH CONCRETE
• EFFECT OF NATURAL POZZOLAN ADDITION ON EXPANSIONS CAUSED BY ALKALI-SILICA REACTION
• EVALUATION AND COMPARISON OF THE PHYSICAL PROPERTIES OF FIBRILLATED POLYPROPYLENE FIBER-REINFORCED CONCRETES
• IMAGE ANALYSIS OF PORTLAND CEMENT CONCRETE AND ASPHALT CONCRETE PAVEMENTS USING SCANNING ELECTRON MICROSCOPE IMAGES (WITH DISCUSSION AND CLOSURE)
• INFLUENCE OF EARLY HEAT CURING ON PROPERTIES OF 100-MPA AIR-ENTRAINED CONCRETE
• INFLUENCE OF LOADING TYPE, SPECIMEN SIZE, AND FIBER CONTENT ON FLEXURAL TOUGHNESS OF FIBER-REINFORCED CONCRETE
• MECHANICAL PROPERTIES OF LIGHTWEIGHT CONCRETE INCORPORATING RECYCLED SYNTHETIC WASTES
• NONDESTRUCTIVE IDENTIFICATION OF INTERNALLY DAMAGED AREAS OF CONCRETE BEAM USING THE SPECTRAL ANALYSIS OF SURFACE WAVES METHOD
• OPTIMIZATION OF ROLLER-COMPACTED CONCRETE FOR LOCAL APPLICATION
• PERFORMANCE CHARACTERISTICS OF MONOFILAMENT POLYPROPYLENE FIBER-REINFORCED CONCRETE
• PREDICTION OF CREEP EFFECT IN SEGMENTAL CONCRETE BRIDGE CONSTRUCTION
• RECYCLING CONTAMINATED SPENT BLASTING ABRASIVES IN PORTLAND CEMENT MORTARS
• STABILIZATION AND SOLIDIFICATION OF CONTAMINATED SOILS AND SLUDGES USING CEMENTITIOUS SYSTEMS: SELECTED CASE HISTORIES
• SYSTEM OPTIMIZATION OF FAILURE, CONSTITUTIVE MODELING, AND STRENGTHS OF CONCRETE AND OTHER GEOLOGICAL MATERIALS USING GENETIC ALGORITHM
• USE OF MATURITY AND PULSE VELOCITY TECHNIQUES TO PREDICT STRENGTH GAIN OF RAPID CONCRETE PAVEMENT REPAIRS DURING CURING PERIOD