ACI 544.2R

Abstract

Scope: This report applies to the measurement of fresh state and fiber-dispersion properties of both conventionally mixed and placed (vibrated) FRC and fiber-reinforced self-consolidating concrete (FR-SCC) using steel, glass, polymeric carbon, minerals (such as basalt), and natural fibers. The test methods reported herein are also applicable to ultra-high-performance concrete (UHPC). It is worth remarking that, generally, UHPC does not contain coarse aggregates and is employed in combination with reduced or no amounts of conventional reinforcement. In view of this, care should be taken in assessing the significance of the results, as far as the consistency is concerned, of the volume of material employed in the tests with reference to the heterogeneity scale of the mixture (maximum aggregate size, maximum fiber length). Moreover, passing ability tests, such as the ones reviewed in 3.2.2, may also provide information of limited significance. This report does not relate to thin glass FRC or mortar products produced by the spray-up process. The Prestressed Concrete Institute (1981), International Glassfibre Reinforced Concrete Association (2016a,b), and ASTM C1116/ C1116M contain recommendations for test methods for these spray-up materials. Measurement of the properties of fiber-reinforced shotcrete (FRS) that contain the aforementioned fiber types can be performed using the test methods described herein. Special procedures may be required to cast specimens or obtain them from existing structures, as well as to measure properties specific to shotcreting technology. Relevant provisions can be found in ACI 506.2.