For example, let's compare the technical characteristics of single and one-and-a-half silicate bricks. We remind you that silicate brick is not ceramic; it is made from a mixture of sand and lime in a 9:1 ratio. And it is produced not by firing, but using semi-dry vibrocompression technology.
So, all characteristics in order: The strength grade of a one-and-a-half brick is M-200 (single brick also M-200). Frost resistance – 25 freeze-thaw cycles (single brick – 35). Thermal conductivity – from 0.66 to 0.7 W/m*C (same as single brick). Weight – 4 kg (3.2 kg) for hollow or 4.9 kg (3.5 kg) for solid. Voidness – from 13% to 45%. Vapor permeability – 0.11 mg/(m*h*Pa) (same as single brick). Water absorption coefficient – up to 16% (single brick – 12%). Fire resistance – 550 degrees (550 degrees).
As you can see, there are no significant differences. The frost resistance of a one-and-a-half brick (https://trivita.ua/ru/kirpich/kirpich-stroitelnyj-rjadovoj/polytornyi-kirpich) is 10 cycles lower than that of a single brick. This is because it has a larger area in the masonry, and the holes in its structure also occupy a larger area. The more voids in the material, the lower its frost resistance.
The water absorption coefficient of a one-and-a-half brick is higher due to its larger area and greater number of pores in the structure. From this we can conclude that another difference between single and one-and-a-half bricks is the degree of voidness.
By the way, did you notice the wide range in voidness indicators? This is explained very simply – silicate brick can be hollow or solid. For a hollow product, the voidness degree reaches 45% due to large round or square holes, while for a solid product it ranges from 13% to 18% due to micropores.
The thermal conductivity coefficient also differs depending on whether the brick is solid or hollow. For hollow material, thermal conductivity is 0.66 W/m*C, for solid – 0.7 W/m*C.
Let's summarize all of the above. There are five differences between single and one-and-a-half bricks: Dimensions. Weight. Frost resistance. Water absorption coefficient. Voidness.
In the case of ceramic brick, the picture is approximately the same. In any case, the two main differences are dimensions and weight.
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