The ornamental design for a lengthadjustableconcrete and grout form, as shown and described.
FIG. 1 is a perspective drawing showing my new design for a length adjustable concrete and grout form fitted around a column and base plate, preparatory to cutting a tag end from the form and interlocking the overlapped form ends, and wherein the matter shown in dashed line comprises no part of the invention; and,
FIG. 2 is a plan view of the form folded open and flat, portions being eliminated for ease of illustration.