Properties of pervious concrete incorporating recycled concrete aggregates and slag

Evaluation of the Hydraulic, Physical, and Mechanical Properties of Pervious Concrete Using Iron Tailings as Coarse Aggregates

“…2020, 10, x FOR PEER REVIEW 9 of 15 Figure 7 displays the dry density of the pervious concrete and its relationship versus the effective porosity and measured porosity. As shown in Figure 7, the dry density of the pervious concrete decreased from 2240 to 1798 kg/m 3 with increasing target porosity from 8% to 30%, which is typical for pervious concrete (1600~2200 kg/m 3 ) [22]. The relationships between the dry density and the effective porosity and measured porosity are represented in Equations (9) and (10), respectively.…”

“…Work by Ma [19] studied the heavy metal leaching of iron tailings, which shows that the concentration of heavy metal leaching of iron tailings is within the range of Chinese standards of GB/T 5085.3 [20]. Table 1 summarizes the variables and properties of pervious concrete using different aggregates [21][22][23][24][25][26][27][28]. We can draw two conclusions from Table 1: (1) The substitution of solid waste for the natural aggregate of pervious concrete has attracted much attention.…”

“…The optimum porosity ranged from 7.5% to 16.5%, which provides a theoretical basis for the mix design and performance for the preparation of pervious concrete. Figure 11 shows the comparisons of the permeability coefficient (A) and compressive strength (B) of pervious concrete with different types of aggregates [21][22][23][24][25][26][27][28]. Although different experimental conditions such as porosity type (fresh state, total, or open), test method and samples size may restrict the comparison of the properties of pervious with different types of aggregates, Some useful information can still be found by summarizing and analyzing these pervious concretes.…”

“…For pervious concrete using the same ordinary Portland cement, such as burnt brick-based pervious concrete, recycled concretebased pervious concrete and iron tailings-based pervious concrete (see Table 1), although their compressive strength are similar under the same porosity, but the permeability coefficient of burnt brick-based pervious concrete and recycled concrete-based pervious concrete is one order of magnitude higher than that of iron tailings-based pervious concrete, which may be mainly due to the good pore structure of burnt brick-based pervious concrete and recycled concrete-based pervious concrete, with fewer semi-connected pores. Figure 11 shows the comparisons of the permeability coefficient (A) and compressive strength (B) of pervious concrete with different types of aggregates [21][22][23][24][25][26][27][28]. Although different experimental conditions such as porosity type (fresh state, total, or open), test method and samples size may restrict the comparison of the properties of pervious with different types of aggregates, Some useful information can still be found by summarizing and analyzing these pervious concretes.…”

Seismic Behavior Analysis of Recycled Aggregate Concrete-filled Steel Tube Column

“…Recycled aggregate concrete (RAC) technology has become a hotspot and frontier topic in engineering and academic circles [1]. However, the limitations of RAC, such as large water absorption, large pores, low strength and elastic modulus, and poor fluidity, hinder its application in engineering practice [2]. So, the combination structure of recycled aggregate concrete-filled steel tube (RACFST) came into being.…”