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Critical evaluation of accelerated test methods for detecting alkali-reactivity of aggregates

Technical Report:

Abstract

The availability of high quality aggregates for concrete is often conditioned by increasingly restrictive environmental restraints. The limited availability of natural aggregates free of reactive minerals imposes the use of lower quality or not adequately tested aggregates, thus increasing the risk of alkali-aggregate reactions. This paper reports on the use of three accelerated test methods - infrared IR spectroscopy, mortar bar expansion tests in a 1 N NaOH bath at 80 degrees C, or in a saturated NaCl bath at 50 degrees C - to evaluate the potential reactivity of opal, fused silica, Nymolle and Torre Lago sands. Macro-crystalline quartz was used as a reference aggregate, and classical ASTM test methods were adopted as reference tests. It was found that the NaOH bath test method is the most suitable for evaluating the alkali reactivity of the aggregates tested, and that the mineralogical composition of the cement significantly affects the expansion level of mortar bars in both the NaOH and NaCl bath tests.
Publication Date:
Dec 31, 1991
Product Type:
Technical Report
Report Number:
ETDE-IT-92-98
Reference Number:
SCA: 420500; 420200; 052002; PA: ITAN-92:001466; SN: 93000910623
Resource Relation:
Other Information: PBD: 1991
Subject:
42 ENGINEERING; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; CEMENTS; WEAR RESISTANCE; MATERIALS TESTING; SODIUM HYDROXIDES; SOLUTIONS; SAND; OPALS; CHEMICAL REACTION KINETICS; MINERALOGY; STANDARDS; 420500; 420200; 052002; FACILITIES, EQUIPMENT, AND TECHNIQUES; WASTE DISPOSAL AND STORAGE
OSTI ID:
10107184
Research Organizations:
Ente Nazionale per l`Energia Elettrica, Milan (Italy). Centro di Ricerca Idraulica e Strutturale; Rome Univ. (Italy)
Country of Origin:
Italy
Language:
English
Other Identifying Numbers:
Other: ON: DE93748439; TRN: 92:001466
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
ITAN
Size:
37 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Berra, M, Mangialardi, T, Paolini, A E, and Turriziani, R. Critical evaluation of accelerated test methods for detecting alkali-reactivity of aggregates. Italy: N. p., 1991. Web.
Berra, M, Mangialardi, T, Paolini, A E, & Turriziani, R. Critical evaluation of accelerated test methods for detecting alkali-reactivity of aggregates. Italy.
Berra, M, Mangialardi, T, Paolini, A E, and Turriziani, R. 1991. "Critical evaluation of accelerated test methods for detecting alkali-reactivity of aggregates." Italy.
@misc{etde_10107184,
title = {Critical evaluation of accelerated test methods for detecting alkali-reactivity of aggregates}
author = {Berra, M, Mangialardi, T, Paolini, A E, and Turriziani, R}
abstractNote = {The availability of high quality aggregates for concrete is often conditioned by increasingly restrictive environmental restraints. The limited availability of natural aggregates free of reactive minerals imposes the use of lower quality or not adequately tested aggregates, thus increasing the risk of alkali-aggregate reactions. This paper reports on the use of three accelerated test methods - infrared IR spectroscopy, mortar bar expansion tests in a 1 N NaOH bath at 80 degrees C, or in a saturated NaCl bath at 50 degrees C - to evaluate the potential reactivity of opal, fused silica, Nymolle and Torre Lago sands. Macro-crystalline quartz was used as a reference aggregate, and classical ASTM test methods were adopted as reference tests. It was found that the NaOH bath test method is the most suitable for evaluating the alkali reactivity of the aggregates tested, and that the mineralogical composition of the cement significantly affects the expansion level of mortar bars in both the NaOH and NaCl bath tests.}
place = {Italy}
year = {1991}
month = {Dec}
}