00676700

Component

http://onlinepubs.trb.org...trr/1994/1458/1458-017.pdf

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

The use of natural pozzolans to prevent excessive expansion of concrete caused by an alkali-silica reaction is referred to in the published literature. However, few data have been published on the use of natural pozzolans in field concrete. Results of an extensive study to determine the influence of natural pozzolans in reducing deleterious expansion due to alkali-silica reaction are presented. Twenty-six different types of natural pozzolans were collected from various locations in the Black Hills of western South Dakota and tested to determine their mineralogical content, chemical composition, and physical properties. On the basis of the strength activity index test with cement, the 10 most promising pozzolans were selected. Those were tested to determine their effectiveness in controlling the alkali-silica reaction. That was done by blending 10, 15, and 25% of natural pozzolans (by weight) with Type I/II cement. The blended cements then were tested according to ASTM P214, using mortar bars. Test results indicated that all the natural pozzolans tested except one were effective in reducing expansion due to alkali-silica reaction. A comparison of the effectiveness of reducing deleterious expansion by fly ash and natural pozzolan blended cements indicated that two natural pozzolan-blended cements were more effective than the Class F fly ash-blended cement in reducing expansion.

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. 118-128

1994

Transportation Research Record

0309060656

Figures (8) ; References (12) ; Tables (8)

Alkali silica reactions; Alternatives analysis; Chemical composition; Concrete; Durability; Fly ash; Measures of effectiveness; Mineralogy; Physical properties; Pozzolan

Effectiveness

Highways; Materials; I32: Concrete

TRIS, TRB, ATRI

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
• 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
• INTERPRETATION OF ACCELERATED TEST METHOD ASTM P214 TEST RESULTS
• 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