Hello, I am also a commercial concrete person. There is no standard curing room for specimens, so special attention should be paid to the production of specimens. The compression principle of the specimen is to put more stones when making it under axial compression. I am a quality inspector. I always do specimen maintenance. When the clinker is put into the trial mold, it is inserted twice and compacted from all directions to the center. After that, touch the knife. Insert again, so that the mortar of the whole specimen is completely concentrated. The upper, middle and lower floors are dense. Scrape off the upper mortar, put in stones, insert them, and finally knock and polish them! Note that the stone I am talking about here is clinker. Don't just find some stones to put in (this practice is not standardized, and it should not be too obvious if the supervisor or Party A is present). Of course, it will be more dense to have a special vibrating table as a specimen. Manual mode will get tired in a day or so (depending on the situation). During formwork removal and maintenance, the specimen shall be placed in a cool and humid place under the shed in the early stage. Water frequently to keep the water demand of specimens. Cover with a sack or quilt after watering (please wet the sack or quilt). After more than one week, the watering frequency can be reduced appropriately (it is recommended not to be lazy and use snacks more), but the specimens must be kept moist. If you want to have high early strength, you can also boil it in water. Because we can't control the temperature around the specimen, we can only work hard on these! It should be enough to bask in the sun before the specimen is sent for inspection. I did this. If you have any objection, please criticize and correct me. I can't answer your question at this time. Please forgive me for going on a business trip tomorrow! If you agree with this method, please adopt it as the best answer. Thank you!