Effect of portland cement (current ASTM C150/AASHTO M85) with limestone and process addition (ASTM C465/AASHTO M327) on the performance of concrete for pavement and bridge decks.
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2014-02-01
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Abstract:The Illinois Department of Transportation (IDOT) is making several changes to concrete mix designs, using revisions to ; cement specification ASTM C150/AASHTO M85 and ASTM C465/AASHTO M327. These proposed revisions will enable the ; use of more sustainable materials for concrete pavements, overlays, and bridge decks. Accordingly, a study was conducted ; by the University of Illinois at Chicago (UIC) to test the performance of concrete mixes batched with cement comprising ; less (conventional) and more (modified) than 5% by weight of limestone and inorganic processing additions (IPA) specified ; in ASTM C465/AASHTO M327, and/or insoluble residue (IR) with quantity above the specified limit by ASTM C150. ; Twenty-four concrete mixes with different cementitious combinations and aggregates were developed for this study. Each ; cement source was batched in a concrete mixture by replacing 30% of the total cement content with supplementary ; cementitious materials (SCMs), fly ash, or slag. Also, each cementitious combination was batched with fine aggregates ; (either natural or combined sand) and coarse aggregate (crushed limestone). ; The study included measuring fresh properties such as the slump, air content, unit weight, and setting time. The hardened ; properties included measuring the strength and durability for each concrete mix combination. The strength results were ; measured in terms of compressive and flexural strength, and the durability results were measured in terms of rapid ; chloride penetration resistance (coulombs), water permeability (DIN 1048), chloride ion penetration, and freeze/thaw tests ; of the concrete mixes. ; The study found similar performance in terms of strength and durability of concrete between the conventional and ; modified cements and demonstrated their performance with SCMs replacements and fine aggregate types.
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