Performance of High Strength Self-Compacting Concrete Beams under Different Modes of Failure

Abstract

Self-consolidating concrete (SCC) is a stable and cohesive high consistency concrete mix with enhanced filling ability properties that reduce the need for mechanical compaction. Limited standards and specifications have been reported in the literature on the structural behavior of reinforced self-compacting concrete elements. The significance of the research presented in this paper stems from the need to investigate the effect of enhanced fluidity of SCC on the structural behavior of high strength selfconsolidating reinforced concrete beams. To meet the objectives of this research, twelve reinforced concrete beams were prepared with two different generations of superplasticizers and designed to exhibit flexure, shear, or bond splitting failure. The compared beams were identical except for the type of superplasticizer being used (second generation sulphonated-based superplasticizer or third generation polycarboxylate-based superplasticizer). The outcomes of the experimental work revealed comparable resistance of beam specimens made with self-compacting (SCC) and conventional vibrated concrete (VC). The dissimilarities in the experimental values between the SCC and the control VC beams were not major, leading to the conclusion that the high flowability of SCC has little effect on the flexural, shear and bond strengths of concrete members.

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

“…However, when the mechanical and fracture behavior of a concrete in an already built structure is required, cylindrical drilled cores are extracted from the concrete structure allowing the compressive strength, the splitting tensile strength and the Young's modulus of concrete to be easily determined (Abou El-Mal et al 2015;Harkouss and Hamad 2015). In this case, the CT test seems to be the suitable test for measurement of the specific fracture energy by using slice shaped specimens cut off from the cylindrical cores, in particular if the above mentioned disadvantages in testing such specimen type are surmounted.…”

“…On its turn, the dimensionless relative notch length a as defined in Eq. (8), is considered the reference parameter to be studied in the modified compact tension tests of concrete, the same as in the original compact tension tests (Harkouss and Hamad 2015).…”

Parametric Study of Self Compacting Concrete Beams Using Finite Element Nonlinear Analysis

“…Validasi model elemen hingga tersebut belum banyak dilakukan oleh para peneliti. Kalibrasi model analisis elemen hingga dengan software MSC Marc/Mentat tersebut dilakukan dengan hasil eksperimen yang diperoleh oleh Harkous (Harkouss & Hamad, 2015). Dengan model elemen hingga yang sudah tervalidasi maka model digunakan untuk melakukan kajian parametrik berupa pengaruh shear retention factor, pengaruh rasio tulangan, dan pengaruh selimut beton pada perilaku lentur balok beton memadat mandiri.…”

Experimental Verification of Resistance-Demand Approach for Shear of HSC Beams

“…One feature of HSC that affects the structural response is the tendency of cracks to pass through instead of around the aggregates due to the smaller difference between the strength of aggregate and concrete matrix. This creates smoother crack surfaces, reducing the contribution of aggregate interlock and hence, reducing the shear force carried by concrete V c (El-Sayed et al 2006;Harkouss and Hamad 2015). As a result, higher dowel forces occur in the longitudinal reinforcing bars.…”