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control joints
i have seen 2 ways of installing control joints in a slab
1) pour, finish, let setup and cut the joints with a saw
2) pour, and as they are finishing the surface they cut in a grove with a trowel
does it make any difference
check out our whitepaper library.
generally, saws are used for larger areas. control joints for small areas, such as sidewalks, are usually tooled in with a "grooving tool".
pca recommends that the depth of the joint be at least 1/4 of the slab thickness.
the sawcuts give a square edge that can be "supported" by sealant (to prevent breaking off the edge from hard wheel traffic). the grooving tool gives a rounded edge that cannot be "supported" by sealant.
many contractors and engineers prefer the early entry saws like "soff cut". this avoids the problems with cracking occuring before the slab is cut.
i hope this helps!

2009-09-08, 01:49 PM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	control joints control joints i have seen 2 ways of installing control joints in a slab 1) pour, finish, let setup and cut the joints with a saw 2) pour, and as they are finishing the surface they cut in a grove with a trowel does it make any difference check out our whitepaper library. generally, saws are used for larger areas. control joints for small areas, such as sidewalks, are usually tooled in with a "grooving tool". pca recommends that the depth of the joint be at least 1/4 of the slab thickness. the sawcuts give a square edge that can be "supported" by sealant (to prevent breaking off the edge from hard wheel traffic). the grooving tool gives a rounded edge that cannot be "supported" by sealant. many contractors and engineers prefer the early entry saws like "soff cut". this avoids the problems with cracking occuring before the slab is cut. i hope this helps! __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]