A study was c on duc t ed in Ok l ahoma in 1 98 3 t o det ermine the p erformanc e o f f abr i c form mats fi l led with different prop o r t i ons o f f ly ash c ement grout mixtures . They were used to r epair a 2 8 5 ft l ong severely ero ded d i t ch . The mat was f i l l ed with three d if f erent mixtures . They were crnmp osed o f 1 0 0 p er c ent c ement , a 5 0 - 5 0 mixture o f f l y ash and c ement and an 8 0 p er c ent fly ash 2 0 p er c ent c ement mix ture . The p r o ject was eva lua t ed by the Ok l ahoma Dep ar t ment o f Transpor t a t ion Research Division for a p er iod o f four years fo l l owing the inst a l l at ion o f the fabr i c form mat . A cost ana l ysi s was made comparing the fabr i c form ma t eri a l t o convent i onal concret e d i t ch l iner . I t was c onc luded that fabr i c form p erforms wel l and is cost effec t ive , and that C l ass c f ly ash be a l lowed in grout mixtures . I t is recommended that , the fabr i c form inst a l l at ion be mon i t ored with core samp l es t aken p er i o di c a l ly for t he next 1 0 years . A p rop osed sp ec i f i c a t i on is inc luded in the app endix o f this r eport . Also , a video t ap e showing the inst a l lat ion o f the f abr i c form mat is ava i l able upon r equest .