Axial compression behavior of reinforced geopolymer concrete columns with demolished concrete lumps

Effect of recycled coarse aggregate on physical and mechanical properties of concrete

“…Many experimental investigations have been conducted on reinforced concrete columns with different CARR under uniaxial and cyclic compressive loading (Ajdukiewicz et al, 2007; Choi, 2017; Choi et al, 2012; He et al, 2017; Lei et al, 2020; Tam et al, 2014; Wang et al, 2015; Wang et al, 2019; Xiao et al, 2006, 2012; Zhang et al, 2017; Zhou et al, 2010). Zhang et al (2017) utilized 22 geopolymer/ordinary concrete specimens with different strength and demolished concrete lamps (DCL) were adopted as RCA. The test results showed that both the columns with ordinary concrete and geopolymer concrete gave the same axial compression behavior and stiffness.…”

“…The results from the three studies concluded that these columns have acceptable seismic properties and they can be used in severe earthquake regions. Many of the mentioned studies utilized RCA without reporting comprehensive testing to determine the physical and mechanical properties of RCA (Ajdukiewicz et al, 2007; AL-Zahraa et al, 2010; Arezoumandi et al, 2015; Chen et al, 2010; Choi, 2017; Choi et al, 2012; Hamad et al, 2018; He et al, 2017; Ignjatović et al, 2013; Knaack et al, 2014; Lau et al, 2014; Maruyama et al, 2004; Nandhini et al, 2016; Tam et al, 2014; Wang et al, 2015; Xiao et al, 2006; Zhang et al, 2017; Zhou et al, 2010). A number of numerical investigations using finite modeling has been conducted to study the mechanical behavior of concrete elements with RCA (Xu et al, 2018, 2019a, 2019b).…”

“…It is worth mentioning that some researchers did not clearly mention the source of the RCA utilized in their research work (Arezoumandi et al, 2015; Chen et al, 2010; Choi et al, 2012; Haque et al, 2014; Knaack et al, 2014; Tam et al, 2014; Tiwari et al, 2007; Yanweerasak et al, 2018; Zhou et al, 2010). While others stated that the source of RCA was waste from a city landfill (Butler et al, 2013; Franklin and Gumede 2014; He et al, 2017; Poon et al, 2004; Tsoumani et al, 2014; Xiao et al, 2006), demolition of real buildings (Al-Zahraa et al, 2010; Ignjatović et al, 2013; Lau et al, 2014; Maruyama et al, 2004) or laboratory concrete specimens (Ajdukiewicz et al, 2007; Choi 2017; Hamad et al, 2018; Ignjatović et al, 2013; Nandhini et al, 2016; Tabsh et al, 2009; Wang et al, 2015; Yong et al, 2009; Zhang et al, 2017). Based on the conducted comprehensive literature review, few research works have been conducted to study the properties of recycled aggregate obtained from the waste of standard cube compressive test with a specific CCS.…”