Experimental Study on Flexural Behavior of Recycled Coarse Aggregate Concrete Beam

Abstract

In order to investigate flexural behavior of simply-supported beam using recycled coarse aggregate concrete, the difference of the component normal section stress distortion performance and failure characteristic between the recycled concrete beam and the normal concrete beam is researched. The approaches of testing the flexural behavior of 6 recycled course aggregate beams with the same section size, different replacement ratio of recycled coarse aggregate (0%, 50%, 70% and 100%) and different percentage reinforcement (0.68%, 0.89% and 1.13%). Based on the experimental the following conclusions are draw. There are also 4 phases of elasticity, cracking, yield and ultimate during the stress course of recycled concrete beam component normal section stress; the average strain measured on cross-section obliges to the plane section assumption; the characteristics of stress distortion and destruction of recycled concrete beam are basically the same as those of the normal concrete beam. Under same conditions, the cracking moment and the ultimate flexural carrying capability of recycled concrete beam is almost the same as those of normal concrete beam. The deformation of recycled concrete beam is larger than concrete beam. The conclusion of the paper is that it is still feasible to calculate the ultimate bending moment, cracking moment, and the biggest crack width of recycled concrete beam according to the formula in China Concrete Structure Design Code, but the deflection formula needs to be adjusted.

A review of experimental results on structural performance of reinforced recycled aggregate concrete beams and columns

“…The flexural behavior of RRAC beams is discussed in this section. Sato et al (2007), Fathifazl et al (2009b), Bai and Sun (2010), Choi et al (2012), Ignjatović et al (2012), Knaack and Kurama (2015), Arezoumandi et al (2015b), Alnahhal and Aljidda (2018), and Seara-Paz et al (2018) carried out experimental tests on simply supported beams using four-point bending setup, varying the geometric characteristics of the beams and the mix characteristics of RAC.…”

An experimental study on flexural strength of reinforced concrete beams with 100% recycled concrete aggregate

“…They concluded that current codes flexural provisions can be used for RCA beams. Bai and Sun [14] used 8-10 years old RCA with different replacement levels (50%, 70%, and 100%). They observed similar crack pattern, but deflection and crack width increased with the increment of RCA replacement level.…”

“…Unfortunately, concrete, our most common construction material uses a significant amount of non-renewable resources. Consequently, many researchers have investigated the use of recycled materials in the production of concrete such as fly ash [1][2][3][4][5][6][7] and recycled aggregate [8][9][10][11][12][13][14][15][16][17].…”

Experimental and Numerical Evaluation of Perfobond Rib Shear Connectors Embedded in Recycled Aggregate Concrete

“…In addition to the use of FE simulation, experimental studies on PBL connectors and the in uence of di erent parameters that a ect its shear sti ness, strength, and load-slip response were gradually established during the past few decades or so. Empirical formulas for predicting bearing resistance of PBL fabricated with normal concrete are commonly found in the literature [17][18][19][20][21][22][23][24][25][26][27]. e majority of published researches in this area has focused mainly on behavior of PBLs in composite beams fabricated from normal concrete or high-strength concrete ; however, very few were related to beams made of RAC materials [18,28].…”

“…Empirical formulas for predicting bearing resistance of PBL fabricated with normal concrete are commonly found in the literature [17][18][19][20][21][22][23][24][25][26][27]. e majority of published researches in this area has focused mainly on behavior of PBLs in composite beams fabricated from normal concrete or high-strength concrete ; however, very few were related to beams made of RAC materials [18,28]. Due to the fact that mechanical behavior of PBL varies with RAC properties, a deeper knowledge concerning mechanical behavior of PBL using RAC becomes crucial [9].…”