GROUT FOR FILLING A MICRO-TRENCH

1 . A grout for a backfilling a micro-trench, comprising:

class F fly ash in a range of approximately 0 to 30% by weight of the grout; and

cement kiln dust in a range of approximately 50 to 90% by weight of the grout.

2 . The grout of claim 1 , wherein it is formed as a single grout composition for mixing with water to yield a finished grout.

3 . The grout of claim 1 , wherein the grout mixture is inserted into the micro-trench and consolidates into voids in pavement and aggregate sub base areas giving structural stability to any defects in said pavement and aggregate sub base areas.

4 . The grout of claim 1 , further comprising:

a mid-range water reducer.

5 . The grout of claim 4 , wherein said mid-range water reducer is naphthalene.

6 . The grout of claim 4 , wherein said mid-range water reducer is a lignosulphonate.

7 . The grout of claim 4 , wherein said mid-range water reducer is added at a rate of approximately 0-12 fluid ounce equivalent per hundred-weight of dry grout mixture.

8 . The grout of claim 4 , further comprising:

a dry sodium hydroxide material.

9 . The grout of claim 8 , wherein said dry sodium hydroxide material is added at a rate of approximately 0-19 dry ounces per hundred weight of dry grout mixture.

10 . A method of preparing a micro-trench backfill grout from recycled materials, comprising:

preparing a single component dry grout mixture comprising approximately 0-30% class F fly ash and approximately 50-90% cement kiln dust;

adding approximately five gallons of water to approximately 70 pounds of said dry grout mixture;

adding a mid range water reducer at an addition rate of approximately 0-12 fluid ounce equivalent per hundred-weight of said dry grout mixture; and

adding dry sodium hydroxide at an addition rate of between approximately 0-19 dry ounces per hundred weight of said dry grout mixture.