Flexural Behavior of Reinforced Recycled Aggregate Concrete Beams

Abstract

These days the amount of demolished concrete waste has been increasing due to reconstruction and redevelopment of aged buildings. So the use of recycled aggregates is recommended to solve environmental problems. Some investigations have been carried out to study the flexural behavior of reinforced concrete beams with recycled aggregates. But these have some limitation due to the use of low quality recycled aggregates and small-scale specimens in the laboratory. The purpose of this experimental study is to evaluate the flexural behavior of simply supported RC beams subjected to four-point monotonic loading and made with recycled aggregates. Seven full-scale RC beams were manufactured with different replacement level of recycled aggregates. The main parameters of the study are combination of aggregates. From the test results, the flexural behavior of the beam is described in terms of crack patterns and failure modes. And the flexural strength of RC beam with different types of recycled coarse aggregates and recycled fine aggregates is compared with the provision of KCI code.

Influence of Replacement Ratio of Recycled Concrete Aggregates on Flexural Behavior of Concrete Beams

“…They reported an increase in the deflections as the amount of RCA is increased. Similar results were reported by Song et al [19] However, they also reported that the addition of RCA into concrete has little effect on the ultimate moment capacity and the flexural crack width of the tested specimens.…”

A database on flexural and shear strength of reinforced recycled aggregate concrete beams and comparison to Eurocode 2 predictions

“…The first step in this research was the collection of all available studies on shear and flexural strength of RAC beams. A review of existing literature yielded 16 studies [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] carried out in the period from 2001 to 2015 with a total of 217 experimental results. All of the studies were comparative tests of RAC and NAC beams.…”

“…(11), section 6.2.3 of EC2. Contrary to MC2010, for predictions according to EC2 the angle θ wasn't calculated but rather it was measured from the photos given in studies [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] as the inclination of the critical crack at beam mid-depth. However, its value was restricted to the interval 21.8º-45º as given in the same section.…”

“…One very important thing to note is that in 10 out of the 25 results from studies [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] the shear strength without stirrups V R,c was larger than the shear strength with stirrups V R,s . This is mainly due to the fact that most of those results were beams reinforced with a transverse reinforcement ratio just above the minimum value of 0.08f c 0.5 /f yw .…”

The effect of recycled coarse aggregate (RCA) with surface treatment on concrete mechanical properties

“…However, with the advanced development of technology, recent waste management may result in recycled aggregate with MATEC Web of Conferences 195, 01017 (2018) https://doi.org/10.1051/matecconf/201819501017 ICRMCE 2018 quality equal to the natural aggregate (NA). Thus, the potential of RCA as a structural element and for high added-value utilization has been rapidly growing [4].…”