TxDOT Type VIII neat epoxy compound (ASTM C 881 Type I or IV) is produced by mixing two proprietary liquid components in the ratio required by the manufacturer.

Refer to
DMS 6100
,
DMS 6110
, and the
MPL
for
Epoxies and Adhesives
for additional information.
Use materials from TxDOT’s preapproved list for Type VIII epoxy. Contractor may use other materials only if specifically authorized by the Engineer in writing.
Follow manufacturer’s published recommendations for storage including temperature and humidity controls. Retain manufacturer lot tags with packaged date and shelf life for inspection prior to product use.
Follow manufacturer's material requirements.

TxDOT Type VIII epoxy mortar is produced by combining the neat epoxy compound and an aggregate (usually silica sand) approved by the epoxy producer and TxDOT.

Ratio by Volume:
Adhere to the requirements from the manufacturers’ technical data sheets when proportioning the sand to add to the neat epoxy.
Silica Sand:
Most manufacturers recommend that 20/40 mesh sand be used to produce epoxy mortar. It is acceptable to use sand that passes a No. 16 sieve but is retained by a No. 50 sieve (16/50 mesh).
Use sand other than 16/50 mesh or 20/40 mesh only if authorized by the epoxy manufacturer and the Engineer.
If the
repair
will remain visible after a member has been erected, the Engineer may require use of a combination of gray and white sand to make the epoxy mortar material closely resemble the surrounding concrete.

Do not exceed 130°F if heating any of the epoxy liquid components to ease mixing or application.

NOTE: Keep a separate container that is protected from rain and other water for storing sand used to mix Type VIII epoxy mortar. Sand from a stockpile is typically far too wet to be used for mixing epoxy mortar.

Do not exceed 230°F when heating sand to dry it. Allow sand to cool to a maximum temperature of 130°F before mixing with the neat epoxy.