By M. Levitt, Levitt, Mauri Levitt Dr
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Extra resources for Concrete Materials: Problems and Solutions
Mortar spacers are preferred with spacers having aggregate exposure by the same process planned for the concrete. 0, preferably of the same fine aggregate (‘sand’) planned for the concrete. Curing of the spacers under damp conditions for at least the first 48 hours is recommended. (e), (f) Ensure that the seating area of both trestle-type and wheel-type spacers is pierced to at least 25% of its section. This permits concrete, under the action of compaction, to interweave with the plastics and cause each spacer to act compositely rather than as an individual piece of material.
In effect, an impact flexural test is being conducted: breakage of the paving flag is the common result. The danger to pedestrians from tripping cannot be overemphasised. Although it is not known how many cases are brought against local authorities for personal injury, my experience with some authorities indicates that the departments dealing with installation, maintenance and legal matters seem to operate in isolation from each other. Information brought to my attention in the mid-1990s indicated that one local authority took maintenance action only when the stepping at paving flag joints exceeded 25mm.
The problem arises because the waiting time necessary to reach this maximum is generally impracticable on site. On the rare occasions when such delay can be countenanced, adhesion and/or floor covering failures are rare. However, it is not definitive that 75% is the right number, nor that it is being measured the correct way, nor that the property of RH is the right one to address, nor that efforts should be directed towards the suitable adhesive for different conditions of ‘dampness’ of the floor.