烧结空心砖与烧结多孔砖都是以粘土、页岩、煤矸石为主要原料经焙烧而成的。空心砖的外形为直角六面体,在与砂浆的粘结面上设有增加结合力的深度1毫米以上的凹线槽,而多孔砖没有凹线槽。空心砖的长、宽、高应符合下列要求:(1)290,190,140,90毫米。(2)240,180(175),115毫米。多孔砖有下面两种规格尺寸(毫米): Sintered hollow bricks and sintered porous bricks are made of clay, shale and coal gangue as the main raw materials through calcination. The shape of the hollow brick is a right-angled hexahedron, and a concave groove having a depth of 1 mm or more is provided on the adhesive surface with the mortar to increase the bonding force, and the perforated brick has no concave groove. The length, width and height of hollow bricks shall meet the following requirements: (1) 290, 190, 140, 90 mm. (2) 240, 180 (175), 115 mm. Porous bricks have the following two dimensions (mm):