Evaluation of pre-coated recycled aggregate for concrete and mortar

Bond Behaviors Between Full-Recycled-Aggregate Concrete and Deformed Steel-Bar

“…Similar test results have been reported for the bond strength between deformed steel bar and RAC [26,31]. Based on the study of bond-slip relationship between deformed steel bar and manufactured sand concrete [46], the bond-slip relationship of deformed steel bar to aRAC can be calculated by least squares approach, and expressed as the composition of micro-slip, slip, internal splitting-broken and decline segments, where, f t is the tensile strength of aRAC, α sr is the influencing coefficient of RCA, and all other terms are as previously described.…”

“…(10), as stated that the stresses and slips decreased with the increasing bond length. Compared to the values of bond-slip curve of steel bar with 5d bond length in manufactured sand concrete [46], the values of τ s /f t,0 , τ cr /f t,0 and τ u /f t,0 presented in Table 8 are larger while those of s s , s cr and s u are lower. This presents a better bond property of deformed steel bar to aRAC, due to the enhancement of the secondary hydration of cement grains composited in fine RCA on the interface between deformed steel bar and aRAC [20,21].…”

“…Generally, the increase of aRAC strength has beneficial effect on the bond strength. With the same mechanism of ordinary concrete [46], the compressive strength controls the ability of aRAC in front of the crescent ribs of steel bar under compression, while the tensile strength controls the adhesion bond of steel bar and the splitting resistance of aRAC under lateral pushing force. As the damage degree of aRAC connected with steel bar reduces with the increase of aRAC strength, the bond strength increases slightly for specimens with high aRAC strength [27].…”

Characteristics and application potential of municipal solid waste incineration (MSWI) bottom ashes from two waste-to-energy plants

“…The data shows that BAW has a higher water absorption than BAM, which could be caused by the higher porosity of BAW or higher content of organic matter [12]. Compared with natural aggregates [49] and recycled aggregates [50,51] as shown in Table 2, the bottom ashes have higher water absorption value.…”

Experimental study on recycled concrete containing recycled fibers and organic fibers

“…Silicon fume can also enhance the compressive strength of RC [6]. Surface pre-coating with thin cement paste for recycled aggregates resulted in better workability and mechanical properties of RC [7]. CO 2 curing was proposed in recent years to pre-treat recycled aggregates, which leaded to a denser structure of the recycled aggregates and, as a result, a higher strength of RC [8].…”