By Knarr N.
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Extra info for 4-Dimensionale projektive Ebenen mit grosser abelscher Kollineationsgruppe
A third method of ensuring good bond is the use of an epoxy bonding resin. The epoxy bonding resin should meet the requirements of ASTM C881 for a type II, grade 2, class B or C resin, depending on the job site ambient temperatures. Epoxies bond best to dry concrete. It may be necessary to dry the hole immediately prior to dry packing using hot air, a propane torch, or other appropriate method. The concrete temperature, however, should not be high enough to cause instant setting of the epoxy or to burn the epoxy when it is applied.
Typical appearance of drying shrinkage cracking. —Plastic shrinkage cracking caused by high evaporative water loss while the concrete was still in a plastic state. is exceeded with resulting cracking. Cracking is also caused by alkali-aggregate reaction, sulfate exposure, and exposure to cyclic freeze-thaw conditions, as has been discussed in previous sections, and by structural overloads as discussed in the following section. Successful repair of cracking is often very difficult to attain. It is better to leave most types of concrete cracking unrepaired than to attempt inadequate or improper repairs (figure 34 and 35).
Presoaking the hole overnight with wet rags or burlap prior to dry packing may sometimes give better results by reducing the loss of hydration water, but there must be no free surface water in the hole when the bonding grout is applied. The second method of ensuring good bond starts with presoaking the hole overnight with wet rags or burlap. The hole is left slightly wet with a small amount of free water on the inside surfaces. The surfaces are then dusted lightly and slowly with cement using a small dry brush until all surfaces have been covered and the free water absorbed.
4-Dimensionale projektive Ebenen mit grosser abelscher Kollineationsgruppe by Knarr N.