The proportions of cast-in-place top concrete are out of proportion,more sand is used than stone,please advise the disadvantages of this situation

Sand rate significantly affects the ease of use, and with a constant water-cement ratio, adjusting a reasonable sand rate will result in lower strength. The situation you describe should be very bad.

Answer 2:

Under the natural conditions of temperature higher than +5 degrees, if the maintenance is in place and the raw materials have no quality problems, then there is basically no problem if the mold is removed in 14 days.

If you are in a hurry to remove the mold, you have to use the rebound method to estimate the strength and determine the time to remove the mold.

The bottom of the mold demolition of concrete strength requirements: beams, slabs, arches, shells spanning >2m,<=8m, the strength of the design requirements to reach 75%; span >8m, the strength of the design requirements to reach 100%