Second, the feasibility of the finite element analysis model was verified by experimental results presented in this article, as well as by available test data from other researchers. The compressive strength, elastic modulus, and compressive failure mechanism were analyzed. First, compressive tests of the horizontal-hole interlocking hollow concrete blocks were carried out. The research presented in this article investigated the compressive behavior of the proposed load-bearing horizontal-hole interlocking hollow concrete blocks and aimed at analyzing the influence of geometric parameters on the block capacity. Two series of load-bearing horizontal-hole interlocking hollow concrete blocks, referred to as H-shaped series and cross-shaped series, were developed, including three geometric types: type BH-290 (H-shaped), type BH-240 (H-shaped), and type BC-240 (cross-shaped). Thus, the high content of Cu and all other metals embedded in the NMF material were immobilized in the interlocking concrete block specimens. In the leachability results, the leaching of Cu decreased as cement content increased, and its concentration level was well below the Soluble Threshold Limit Concentration limit (STLC). When increasing NMF contents, the density and compressive strength decreased, while the water absorption increased. The results indicated that the NMF residue affected physical, mechanical and chemical properties of NMF interlocking concrete block samples. Properties of the interlocking concrete blocks produced in this study, such as density, water absorption, compressive strength, were firstly examined and the selected mixes were further evaluated for the heavy metal leachability. In this research, the residue was recycled as a substitute for fine aggregates at 0%, 5%, 10%, 15%, and 20% to produce interlocking concrete blocks. The process of copper recovery from waste printed circuit board has generated large amounts of non-metallic fraction (NMF) residue. This paper presents a platter idea to establish the concrete mix proportion design method of mortarless interlocking block, moreover, an example calculation and confirmatory experiment is dispensable. The concrete of interlocking mortarless block has particularity, which is not suitable for “Mix Proportion Design of Ordinary Concrete Regulation” (JGJ55-2010) of China. Setting cone and rectangular holes on block body, accordingly, block laying could forming taper vertical channel and rectangular vertical channel. This design proposal builds geometry interlocking mechanism between the block and its all adjacent ones. The connection of vertical direction in the form of a frustum of a cone, and the connection of horizontal direction in the form of trapezoid shape. Optimizing the shape of mortarless interlocking block. Mortarless interlocking blocks have the advantage of convenient construction and low cost, but establishing the geometry interlocking mechanism between horizontal blocks has been overlooked.
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