Answer: concrete test block is vibrated with a vibrating table. (Only 28 16 14 rebar vibration on hand, vibrate with 16 rebar).
After vibration, when the specimen is taken out, there are bubble holes on the side surface that are very small and densely packed.
Answer: the insertion of the pounding is not according to the edge to the center of the pounding and the insertion of the number of pounding is not reached, the air, water occupies the formation of the side of the surface of the bubble holes is very small and dense.
Concrete test block is a group of several molds, such as two 2 molds is a group of 3 round molds is a group
A: Concrete test block (pieces) of three a group, that is, three molds. Concrete standard specimen mold (pieces) using a cube with a side length of 150mm. Non-standard size of the test piece has a side length of 100mm cube and 200mm cube. Internationally, in addition to the use of side length of 150mm cube, there are Φ15 × 30cm cylinder.
The strength of the corresponding non-standard size of the specimen is converted into the standard specimen strength value using the conversion factor, for the side length of 100mm cube specimen, it should be multiplied by 0.95; for the side length of 200mm cube specimen, it should be multiplied by 1.05; for the Φ15×30cm cylinder specimen, it should be multiplied by 1.20.