Abstract: A method for preparing a cementing material by sintering and activating coal gangue is provided. The method includes the following steps: (1) crushing coarse-grained coal gangue to predetermined particle size; (2) fully and evenly mixing the crushed coal gangue, the composite additive and water according to a set proportion, and granulating the obtained mixture; (3) distributing, igniting and exhausting the granulated pellets in the sintering machine to obtain decarburized coal gangue sinter; (4) cooling the decarburized coal gangue sinter in a cooler; (5) crushing and finely grinding the cooled coal gangue sinter to obtain a coal gangue active mixture; and (6) mixing the coal gangue active admixture, the fly ash, the quicklime and the gypsum according to a predetermined ratio, and then carrying out injection moulding, mold removal and curing to obtain the coal gangue-based cementitious material.

Abstract: A portable truss structure experiment device, belonging to the field of teaching practice in structural mechanics of Civil Engineering. The device comprises a basic framework, detachable beams, locating rods, a slide rail, hinge supports, a truss structure, reflectors, measurement apparatuses and a collection apparatus. The device has the advantages of simple structure, convenient assembly and disassembly, reuse, accurate measurement result, can be synchronized to a large screen to directly obtain a structure influence line, and can implement classroom demonstration of the teaching content of an influence line in structure mechanics. Through experiments, students can understand relevant theories of the influence line in structural mechanics more accurately.