The base course should be cleaned up first, the concrete base course should be sprayed with pure cement slurry, which is granular and easy to bond; the brick wall base course should be watered in advance. The mix proportion of cement mortar for priming is: Cement 1: sand 3: fly ash 0.5: lime paste 0.5. The surface course is made of paper reinforced cement mixed with 10% white cement<br>
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