Abstract: The present invention provides an architectural block which comprises two opposed side walls and at least two parallel partitions positioned between the side walls perpendicular thereto. The partitions and side walls define chambers within the block, and a groove is formed in one edge of each of the partitions. The chambers are filled with a foaming agent comprising a lightweight heat insulator and moisture-proof material.

Abstract: Lightweight building structures constructed by assembling a plurality of building blocks in contiguous end to end relationship. The blocks have spaced apart and parallel opposite longitudinal walls and opposite transverse members integrally connecting said walls so as to define a substantially rectangular inner space. The top of the transverse members of at least a portion of the blocks are at a lower level than the tops of the longitudinal walls so that horizontally extending reinforcing bars may be positioned therein. Vertically extending reinforcing bars which may be surrounded by reinforcing loops are also positioned within the inner spaces defined by the contiguous blocks. Mortar is charged to the inner spaces defined by contiguous blocks to unite the blocks and reinforcing members. V-shaped vertical edges are provided on the longitudinal walls of a block to provide stronger joints between blocks.