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砖的标号虽然以其平均抗压强度来评定,但在确定砖的标号时,是要求抗压和抗折指标同时满足规定要求(表1)。如其中一项不符合要求,就应按低者确定标号。但目前施工现场甚至个别砖厂普遍存在轻视抗折强度的现象,片面认为只要抗压满足要求就算达到标号,这是很危险的。例如75号砖,如其抗折强度达不到1.8N/mm~2(五块平均值)或1.1N/mm~2(单块最小值),就应定为50号,如仍按75号砖使
Although the labeling of bricks is evaluated by its average compressive strength, in determining the labeling of bricks, it is required that the compressive and flexural resistance indexes meet the specified requirements at the same time (Table 1). If one of them does not meet the requirements, the lower one should be identified. However, at present, the phenomenon of disobedience of flexural strength is common in the construction site and even in some brick factories. One side of the problem is that as long as the pressure is sufficient to meet the requirements, it is dangerous to reach the label. For example, brick No. 75, if its flexural strength does not reach 1.8N/mm~2 (five averages) or 1.1N/mm~2 (single block minimum), should be set to 50, if still press 75 Brick make