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After using a primary on concrete we did it pull and push over tests
Always with bad results - cement comes out (laitance problems)
The concrete mix design its adequate (maybe not the water amount)
It is better to check the mix design.
--Check the water content, decrease
--Check sand/gravel ratio, decrease the fine sand
If you are experiencing excessive laitence my first concern is mix design, the shape and grading of stone and sand will influence the potential for laitence. Excess bleeding could be a result of poor grading and w/c ratios.
Proper mixing and good finishing.
after how many days are you testing? let concrete achieve min70% of its strength.. laitance is on concrete surface.. and can be control by good finishing
By using Vibrators , and some chemical admixtures .
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