Impact Performance of Steel Fiber-Reinforced Self-Compacting Concrete against Repeated Drop Weight Impact

Abstract

The self-compacting concrete (SCC) was invented to overcome the compaction problems in deep sections, owing to its perfect workability characteristics. Steel fibers when used with SCC would affect the required fluidity characteristics but improve its impact resistance. In this research, an experimental work was conducted to evaluate the impact response of micro-steel fiber-reinforced SCC, under flexural impact. A 5.47 kg free-falling mass was dropped repeatedly from 100 mm height on the top center of 270 mm-length beam specimens. Eight mixtures with two design grades of 30 and 50 MPa were prepared to distinguish the normal and high-strength SCCs. The distinguishing variable for each design grade was the fiber content, where four volumetric contents of 0%, 0.5%, 0.75%, and 1.0% were used. The test results showed that the impact resistance and ductility were significantly improved due to the incorporation of micro-steel fibers. The percentage improvements were noticeably higher at failure stage than at cracking stage. For the 30 MPa mixtures, the maximum percentage improvements at cracking and failure stages were 543% and 836%, respectively. Weibull’s linear correlations with R2 values of 0.84 to 0.97 were obtained at the failure stage, which meant that the impact failure number followed the Wiebull distribution.

Modified Falling Mass Impact Test Performance on Functionally Graded Two Stage Aggregate Fibrous Concrete

“…As seen in Table 1 , several researchers revealed a significant COV from the drop-weight impact test. Drop-weight impact findings on various types of fibrous concrete clearly showed strong scattering in test results, which was consistent with previous research [ 45 , 53 , 55 , 56 , 58 , 66 , 67 , 68 ].…”

“…Several studies have examined the statistical variance of RFDWI test results for different fibrous concretes [ 55 , 56 , 57 , 58 , 59 , 60 ]; these findings were not regularly distributed [ 49 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 ]. Numerous researchers have calculated the coefficient of variance (COV) values and the ‘t’ value of the student’s t-test to determine the minimal number of test specimens needed to maintain the error within a given range [ 54 , 55 , 58 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ]. Several researchers [ 17 , 18 , 45 , 53 , 65 ] used Weibull distribution to examine the dispersed impact findings.…”

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

“…Impact loads are a type of short-term dynamic load that exposes the material to unusual and unwanted stresses, which is more effective on brittle materials such as concrete. Repeated impacts occur due to the accidental falling of building materials during the construction period, or other objects during the life span, from higher stories [1][2][3]. In parking garages, the collision of cars can also be a source of repeated impacts on columns and walls.…”

Methods of systemic management of the service life of vehicles

“…The increasing complexity of the vehicle design contributes to an increase in costs, both for spare parts and for maintenance and repair complexes, as well as for operating materials. However, these changes are also made possible to consider when building a multi-criteria model based on the data given, for example, in [19][20][21][22] on the specifics of innovative building and machine-building materials.…”