"作铺设之用" can be translated into English as "for laying/paving purposes" or "intended for laying/paving".
Here are some example sentences to illustrate its usage:
This material is specifically designed for laying purposes.
（这种材料专为铺设而设计。）
The tiles are intended for paving the courtyard.
（这些瓷砖是用于铺设庭院的。）