Standard and modified falling mass impact tests on preplaced aggregatefibrous concrete and slurry infiltrated fibrous concrete - Publication - Bridge of Knowledge

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Standard and modified falling mass impact tests on preplaced aggregatefibrous concrete and slurry infiltrated fibrous concrete

Abstract

Although several studies have been conducted to evaluate the impact response of concrete using theAmerican Concrete Institute (ACI) 544-2R falling mass impact test, the variations in test results are themain drawback of this testing method. This study aims to reduce the variations in experimental impacttest results by introducing two simple test setup modifications; (1) using coarse or fine aggregate bed-ding as an alternative to the steel base plate, (2) the use of line or cross-notched specimens with a lineor cross-load distributing steel plate. One hundred thirty-five cylindrical discs were prepared withPreplaced Aggregate Fibrous Concrete (PAFC) and Slurry Infiltrated Fibrous Concrete (SIFCON), testedin nine groups to assess the proposed modified techniques. Steel hooked-end (2.5%) and macropolypropylene (8.0%) fibers were used to develop PAFC and SIFCON, respectively. The research findingsrevealed that using aggregate bedding increased the impact resistance by 38 to 429% for no-notch spec-imens and up to 283% for notched specimens. The presence of notches reduced the total energy absorbedby the bedding material. For instance, the specimens with a line notch and sand bedding exhibited 15 to51% lower failure impact numbers than their corresponding no-notch specimens. Considering surface-notched specimens and aggregate bedding led to a lower scattering of the impact test results, whilethe line-notched specimens exhibited lower average scattering than the cross and no-notched specimens.In general, a percentage decrease in the coefficient of variation of 30 to 74% was attained for specimenswith bedding and/or surface notch compared to reference specimens.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
CONSTRUCTION AND BUILDING MATERIALS no. 298,
ISSN: 0950-0618
Language:
English
Publication year:
2021
Bibliographic description:
Ramakrishnan K., Depak S., Hariharan K., Abid S. R., Murali G., Cecchin D., Fediuk R., Mugahed Amran Y., Abdelgader H., Khatibi J. M.: Standard and modified falling mass impact tests on preplaced aggregatefibrous concrete and slurry infiltrated fibrous concrete// CONSTRUCTION AND BUILDING MATERIALS -Vol. 298, (2021), s.123857-
DOI:
Digital Object Identifier (open in new tab) 10.1016/j.conbuildmat.2021.123857
Verified by:
Gdańsk University of Technology

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