Description
VITROBOND® High-Strength Capping Compound is a mineral-filled, sulfur-based compound formulated for capping concrete test cylinders. It is easily melted, pours smoothly, possesses higher compressive strength and gives consistent test results. Atlas’ sulfur-based capping compounds have been used for many years by independent testing laboratories, pre-stressed concrete structures manufacturers and federal, state and local testing agencies. This compound is suitable for running compressive strength tests upon high-strength concrete.
Compound Offers the Following Advantages:
Ready-to-use—just melt and pour. No mixing or possibility of low strength or erratic results from improper proportions.
Does not require controlled room temperature or humidity conditions during pouring of caps.
Does not require moist curing or other tedious handling procedures.
Not affected by dry cylinders.
Can be tested two hours after cooling.
Virtually no settling in the melting pot, thus, results are uniform from cylinder to cylinder.
Procedure For Use:
Capping compound caps are applied to a concrete test cylinder per ASTM C617. It is suggested that at least two capping rigs be prepared to avoid loss of time in testing. The base plates of the capping rigs should be very lightly oiled or coated with silicone compound, such as a 1% solution of General Electric Fluid SPFE or equal in toluene to facilitate removal of the cap. When silicone release agents are used, the capping rig should be allowed to stand approximately 30 minutes after coating before pouring caps. If oil is used, extreme care should be taken to see that there is not an excess of oil which would affect the capping compound. It is recommended that the base plate of the capping rig be preheated to retard the cooling rate of the capping compound.
