Effect of Recycled Aggregate Quality on the Bond Behavior and Shear Strength of RC Members

Abstract

During the aggregate crushing process, natural aggregate and clinging mortar from existing concrete will inevitably produce small cracks and weak bonds between the aggregate and the existing cement mortar. The weaknesses of the existing cement mortar, adhered to a natural aggregate, negatively affect the properties of a recycled aggregate concrete, which prevents its application in reinforced concrete (RC) structures. Recycled aggregate can be classified into several categories, according to its physical and mechanical properties. The properties of concrete incorporated with the recycled aggregate of various qualities can be controlled, and the variability in its strength can also be reduced. This study aims to promote the application of recycled aggregate by investigating the effects of recycled aggregate quality (i.e., water absorption and the number of fine particles) classified by the Japanese Industrial Standards (JIS) on material properties, mechanical properties, and shear behavior of RC beams with recycled aggregate.

Special Issue: New Trends in Recycled Aggregate Concrete

“…Yanweerasak et al [4] studied the effect of recycled aggregate quality on the bond behavior and shear strength of reinforced concrete members. They concluded that the bond strength of both natural and recycled concrete increased with a decrease in water-to-cement ratio but not for the full spectrum of ratio values.…”

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

“…The authors concluded that the compressive and flexural strengths of concrete with RCA decreased for that with larger CARR. The aforementioned studies limited their experimental work to plain concrete specimens and did not validate the obtained conclusions on real RC elements (Butler et al, 2013; Gumede and Franklin, 2015; Haque et al, 2014; Poon et al, 2004; Tabsh et al, 2009; Tiwari et al, 2007; Tsoumani et al, 2014; Yong et al, 2009; Yanweerasak et al, 2018).…”

“…Comprehensive studies were conducted to investigate the effect of using recycled aggregate on the concrete compressive strength (CCS) (Butler et al, 2013; Chen et al, 2010; Gumede and Franklin, 2015; Haque et al, 2014; Poon et al, 2004; Tabsh et al, 2009; Tiwari et al, 2007; Tsoumani et al, 2014; Yanweerasak et al, 2018; Yong et al, 2009). Poon et al (2004) tested a set of cubes made with three concrete mixes and recycled aggregate under standard compression test.…”

“…Yanweerasak et al (2018) investigated the effect of recycled aggregate quality on the bond behavior and shear strength of concrete elements. They reported that the CCS of the recycled aggregate was not affected by the source of the recycling, while it depended on the strength of the cement mortar and the aggregate strength.…”

Flexural Characteristics Evaluation for Reinforced Concrete Affected by Steel Corrosion Based on an Acoustic Emission Technique

“…Reinforced concrete (RC) is widely used in construction materials for bridge structures owing to its relatively low price and good durability [1]. In practice, the high pH pore solution in concrete protects the steel bar embedded in concrete against corrosion [2].…”