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عمران::
فضای درزگیر
PURPOSE OF BOND BREAKER AND BACK UP: In joints open on one face only the back face of the sealant must not adhere to the bottom of the sealant reservoir so that the sealant is free to assume the desired shape.
The width of the joint sealant reservoir must always be greater than the movement that can occur at the joint.
When the suitability of a new joint sealant is first being considered and a precise determination of the dimensions of the sealant reservoir are required, the approach using Fig. 13 from may be followed.
When a suitable joint width has been established (see Sec- tion 4.3). the appropriate depth for the sealant reservoir must be determined so that the sealant has a good shape (see Sec- tion 2.7).
Similarly, sealant reservoirs (grooves) and expansion or contraction gaps are not dimen- sioned as to width or depth because differing sealants have a wide range of performance capabilities.
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