Utilization of Completely Recycled Fine Aggregate for Preparation of Lightweight Concrete Partition Panels

Abstract

To reduce the cost of lightweight concrete (LWC) partition panels and to address recycling concrete waste, this work utilized completely recycled fine aggregate (CRFA) to replace the natural fine aggregate and ceramsite in the preparation of LWC and LWC partition panels. To this end, an autoclave-free curing process and an air-entraining agent were used to prepare the CRFA-LWC. The workability, compressive strength, drying shrinkage, and pore structure of the CRFA-LWC and the performance of the CRFA-LWC partition panels were then investigated. The results show that the optimal ratio of the CRFA to the cement is 2.2 for the lightweight concrete, and the optimal panel cross section is a rounded rectangular one. All the pores in the CRFA-LWC have a diameter of smaller than 0.17 mm, and the diameter of 89% of them is less than 0.05 mm. In order to satisfy the drying shrinkage requirements stipulated by Chinese code JC/T 169-2016, the CRFA-LWC should be cured for at least 10 days. The economic analysis concludes that the material cost of CRFA-LWC is 40% lower than that of the autoclaved ceramsite concrete. In addition, utilizing CRFA in lightweight concrete can ease the shortage of natural aggregate.

Numerical Study on Seismic Behavior of Demountable Joints Consisting of Reinforced Concrete Columns and Steel Beams

“…Construction and demolition waste (C&DW) accounts for about 30% of global waste production, which can lead to heterogeneous ecological impacts such as the depletion of resource pools, global warming, and land degradation [1][2][3][4][5]. Ordinary buildings are usually designed as permanent structures, but the disposal of construction waste is quite difficult due to various demolition problems [6].…”

Compressive and Thermal Properties of Non-Structural Lightweight Concrete Containing Industrial Byproduct Aggregates

“…The employment of lightweight concrete also leads to economic benefits because of the decreased permanent loads on the structure [ 47 ]. The reduced weight of the structure also allows one to build on the less load-bearing ground without resorting to the complex and expensive foundations, while, above all, guaranteeing the same pressures transmitted to the ground to build buildings with a greater vertical development [ 48 , 49 , 50 ]. Lightweight concrete has a higher ductility than that of ordinary concrete, which is required for anti-seismic structures; the greater the ductility of the material, the greater the capacity to dissipate energy before collapsing [ 51 , 52 ].…”