Owner`s manual

ii. With an observer looking at the Curbilder as shown determine

from the observer’s viewpoint on which side (left/right) the most vertical

side of the curb is being formed. The location of the most vertical side on

the Curb Form determines the hand of the form.

For example, if the most vertical side of the curb is on the observers left side, the curb

form required to extrude the curb should be designated as a left-hand form.

Note: The majority of Curb Forms (over 90%) are manufactured as Left Hand.

Curb Mix Information

Determine the mix design and select a material supplier. Because available mix and job

conditions will vary from one area to another, the following concrete and asphalt mix

specifications can be used as guides to determine exact mix requirements for your application.

General Conditions that apply to all Mixes:

 All Aggregates must be thoroughly washed in order for either the cement or asphalt to bind

properly to the aggregate.

 Moisture content in the aggregate will affect mix performance. A lot of rain water in any

aggregate used in making concrete will increase mix slump. Aggregates used to

manufacture asphalt mixes must be dry (less than 5% moisture by weight) or the steam

created in the mix will prevent sufficient mix density. Wet Aggregates will prevent asphalt

from sticking to the aggregates and cause steam, which will compromise curb density.

 TEST THE MIX BEFORE USING. The same mix formula in different geographic areas will

have somewhat different results on the job site. Avoid Mix surprises on the job site. Some

Mix adjustments are required when using different curb forms and auger sizes. Tall, narrow,

molds need lower slump (less than 1”) or less heat (asphalt mixes, less than 275 Degrees

F). Larger molds (using 8” or 10” augers) can use larger stone (up to ¾”/ #57).

 Avoid Curb Mixes with excessive amounts of sand and fine aggregates (less than 3/32”/ #8

sieve). These types of mixes can have a very smooth surface requiring little if any finishing.

However, the lack of larger stone results in a weak curb. And a high concentration of fines

will cause High Wear on the auger, compaction tube and curb form. Furthermore, a high

concentration of fines has an excessive amount of surface area requiring greater amounts of

Portland Cement or Asphalt to provide proper adhesion. Mixes with high concentrations of

fines can also result in slower machine speeds because of the “slip” of the fines past the

auger.